CN110208999A - Image-pickup method and system - Google Patents
Image-pickup method and system Download PDFInfo
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- CN110208999A CN110208999A CN201910415637.XA CN201910415637A CN110208999A CN 110208999 A CN110208999 A CN 110208999A CN 201910415637 A CN201910415637 A CN 201910415637A CN 110208999 A CN110208999 A CN 110208999A
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- 239000004973 liquid crystal related substance Substances 0.000 abstract description 103
- 230000010287 polarization Effects 0.000 abstract description 42
- 238000003384 imaging method Methods 0.000 abstract description 16
- 238000006073 displacement reaction Methods 0.000 abstract description 9
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- 230000000007 visual effect Effects 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/288—Filters employing polarising elements, e.g. Lyot or Solc filters
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
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Abstract
The present invention relates to optical image technology field, a kind of image-pickup method and system are disclosed, the selection of imaging region and the promotion of overall performance are realized with a kind of new light beam deflection way.The method of the present invention includes: that filtered light beam module and light beam selecting module are arranged before imaging sensor；The light beam selecting module includes at least one level lens set, and lens sets at different levels are made of a polarization grating and an electrically-controlled liquid crystal box respectively；Each electrically-controlled liquid crystal box is provided at least two states；And in the state set of the electrically-controlled liquid crystal box in the arrangement of all light beam selecting modules, each subsets of states corresponds the image region being not exclusively overlapped outside camera lens respectively；The program-controlled corresponding electrically-controlled liquid crystal box switches the acquisition for realizing respective image subregion with state, and in the handoff procedure of image region, not relative disPlacement motion between generating assembly.The technology of the present invention can be widely applied in the application scenarios such as multilane monitoring.
Description
Technical field
The present invention relates to optical image technology field more particularly to a kind of image-pickup method and systems.
Background technique
In recent years, it is had been to be concerned by more and more people about light beam control technique.It is based particularly on new optical devices
The research of light field control technique is the most popular.But according to existing camera technology, ultra high-definition can be realized, big visual field is set
Standby price is usually all very expensive and there are many deficiencies.
Summary of the invention
Present invention aims at a kind of image-pickup method and system is disclosed, it is implemented as with a kind of new light beam deflection way
As the selection in region and the promotion of overall performance.
In order to achieve the above object, the present invention discloses a kind of image-pickup method, comprising:
Filtered light beam module and light beam selecting module are set before imaging sensor；The light beam selecting module includes extremely
Few level-one lens set, lens sets at different levels are made of a polarization grating and an electrically-controlled liquid crystal box respectively；Each electrically-controlled liquid crystal
Box is provided at least two states；And in the state set of the electrically-controlled liquid crystal box in the arrangement of all light beam selecting modules, each state
Subset corresponds the image region being not exclusively overlapped outside camera lens respectively；
The program-controlled corresponding electrically-controlled liquid crystal box switches the acquisition for realizing respective image subregion with state, and in image
In the handoff procedure in region, not relative disPlacement motion between generating assembly.
In order to achieve the above object, invention additionally discloses a kind of image capturing systems, comprising:
Filtered light beam module and light beam selecting module before imaging sensor are set；
The light beam selecting module includes at least one level lens set, and lens sets at different levels are respectively by a polarization grating and one
Electrically-controlled liquid crystal box composition；Each electrically-controlled liquid crystal box is provided at least two states；And in the arrangement of all light beam selecting modules
In the state set of electrically-controlled liquid crystal box, each subsets of states corresponds the image region being not exclusively overlapped outside camera lens respectively；With
And further include:
Program-controlled unit is switched with state for the program-controlled corresponding electrically-controlled liquid crystal box and realizes adopting for respective image subregion
Collect, and in the handoff procedure of image region, not relative disPlacement motion between generating assembly.
The invention has the following advantages:
Under the cooperation of filtered light beam device, the selection of external imaging region is realized with the state switching of electrically-controlled liquid crystal box and is cut
It changes, and can be disposed with the multistage of lens set to increase the deflection of light beam and the quantity of changeable subregion, and then increase visual field
Angle.In handoff procedure, (note: the component is not by above-mentioned imaging sensor and filtered light beam for relative disPlacement motion between generating assembly
Module and light beam selecting module composition；Other components of whole image acquisition system, such as manipulation button are not represented, are not occurred yet
Displacement movement), simple and practical in structure, deployment and operation are very convenient, and overall performance is obviously improved.
Preferably, polarization grating of the present invention is also used to: being deflected into out incident left circularly polarized light in deflection process
The right-circularly polarized light penetrated；And/or incident right-circularly polarized light is deflected into the left circularly polarized light of outgoing；And/or it will enter
It penetrates non-polarized light and is changed into the opposite left circularly polarized light and right-circularly polarized light of angle of diffraction.
Further, the transmitted light beam of polarization grating of the present invention concentrates on: incident left circularly polarized light being deflected into negative
One order of diffraction；And/or incident right-circularly polarized light is deflected into a positive order of diffraction；And/or incident non-polarized light is deflected to
The left circularly polarized light of a positive order of diffraction and the right-circularly polarized light of the negative one order of diffraction.
Whereby, other multiorder diffractives need to be considered present invention effectively prevents traditional raster and need to additionally increase more complicated more
Grade diffraction processing unit and caused by inconvenience.
Below with reference to accompanying drawings, the present invention is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 to Figure 14 and Figure 17 to Figure 30 is respectively image in image acquisition process disclosed by the embodiments of the present invention
The correspondence diagram of region switching and the box-like state of electrically-controlled liquid crystal.
Figure 15 is the deployment relationship signal being set to filtered light beam module between light beam selecting module and imaging sensor
Figure.
Figure 16 is the deployment relationship signal being set to light beam selecting module between filtered light beam module and imaging sensor
Figure.
Figure 31 to Figure 34 is the liquid of polarization grating, the liquid crystal cell of TN structure, the liquid crystal cell of ECB structure and OCB structure respectively
The optional structure diagram of brilliant box.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
Embodiment 1
As shown in Figure 1, the present embodiment discloses a kind of image-pickup method, comprising:
Step S1, filtered light beam module and light beam selecting module are set before imaging sensor；The light beam selects mould
Block includes at least one level lens set, and lens sets at different levels are made of a polarization grating and an electrically-controlled liquid crystal box respectively；It is each described
Electrically-controlled liquid crystal box is provided at least two states；And the state set of the electrically-controlled liquid crystal box in the arrangement of all light beam selecting modules
In, each subsets of states corresponds the image region being not exclusively overlapped outside camera lens respectively.
Step S2, the program-controlled corresponding electrically-controlled liquid crystal box switches the acquisition for realizing respective image subregion with state, and
In the handoff procedure of image region, not relative disPlacement motion between generating assembly.Further, rear end is for acquiring image
The image of each image region can be carried out split screen or the substantially image for being spliced into high pixel etc. by the functional module of data processing.
In the present embodiment, CCD, CMOS structure is can be selected in imaging sensor, and image sensor pixel can be according to specific
Using any pixel specification of selection.Optionally, each polarization grating realizes that light beam spreads out by controlling the periodic structure of material
It penetrates and deflects；Such as: the polarization grating optical property modified material is made of liquid crystal, liquid crystal polymer, or is surpassed by metal
Surface or the super surface of medium are made；Wherein, super surface is ultra-thin two that a series of a kind of artificial micro-structure by sub-wavelengths forms
Array plane is tieed up, has and makes the characteristics such as relatively easy, relatively low, the small in size and thickness ultrathin of loss, may be implemented to electricity
The Effective Regulation of the amplitude of magnetic wave, phase, communication mode, polarization state etc..
Under the action of polarization grating, outgoing beam deflection angle is that beam incident angle and the vector of the polarization grating angle of diffraction are folded
Add.Preferably, the present embodiment polarization grating is also used to: incident left circularly polarized light being deflected into outgoing in deflection process
Right-circularly polarized light；And/or incident right-circularly polarized light is deflected into the left circularly polarized light of outgoing；And/or it will be incident non-
Polarised light is changed into the opposite left circularly polarized light and right-circularly polarized light of angle of diffraction.Further, the polarization grating
Transmitted light beam concentrates on:
Incident left circularly polarized light is deflected into the negative one order of diffraction；And/or
Incident right-circularly polarized light is deflected into a positive order of diffraction；And/or
Incident non-polarized light is deflected to the left circularly polarized light for the order of diffraction that is positive and the right-hand circular polarization of the negative one order of diffraction
Light.
It is worth noting that: the "and/or" relationship in above-mentioned statement, for closing on the inclined of the nearest lens set of external image
It shakes for grating, the incident light and left circularly polarized light and right-circularly polarized light of unpolarized state can be existed simultaneously, and to other grades
Then there is only left-handed and/or dextrorotation circularly polarized lights for the polarization grating of lens set.Due to different target region, there is also light sources
Otherness, there is also uncertainties for the actual functional capability played so as to cause inner stages polarization grating；But it is such description for
For those skilled in the art, corresponding technology is clear in fact rather than is easy to produce ambiguity, subsequent not repeat them here.
Whereby, it is based on the present embodiment, in the transmittance process of light beam, it is assumed that two polarization grating Fictitious data base groove directions
Angle is Φ.When incident light is after first polarization grating, emergent light and incident light angle are the polarization grating diffraction angle1,
And emergent light and incident light are in same level, and the plane is vertical with first polarization Fictitious data base groove direction；Light beam
When incident second polarization grating, beam incident angle degree can be divided into and second polarization grating Fictitious data base groove direction Vertical Square
Upward angle component θ x=θ1* the cos Φ and angle component θ parallel with second polarization grating Fictitious data base groove direction
Y=θ1*sinΦ.After second polarization grating, it is θ that angle component, which increases,1*cosΦ+θ2(θ2For second polarization grating
The angle of diffraction).And θ y angle remains unchanged.Final exit direction θ is the vector superposed of θ x and θ y, and:
θ2=(θ1*cosΦ+θ2)2+(θ1*sinΦ)2。
Optionally, filtered light beam device of the present invention includes linear polarizer.Preferably, the present embodiment will also can further be set
The a part of camera lens as the filtered light beam device between described image sensor and the linear polarizer is set, with mistake
Filter the incident light that excessive non-targeted image region is deflected after penetrating the linear polarizer.
In the present embodiment, the different type selectings based on liquid crystal cell, the state control between lens sets at different levels also accordingly becomes
Change.Its optional two kinds of situation is described below:
Situation one, the lens set liquid crystal cell use TN structure, corresponding two states include the transmission under high voltage
Left circularly polarized light is converted into right-circularly polarized light under state and low-voltage and right-circularly polarized light is converted into left-handed circle
Polarised light；Correspondingly, the filtered light beam module further include be arranged in the linear polarizer and nearest level-one lens set it
Between quarter wave plate.
Situation two, the lens set liquid crystal cell use ECB or OCB structure, for left circularly polarized light to be converted into the right side
Rounding polarised light and right-circularly polarized light is converted into left circularly polarized light, and: the nearest level-one with the linear polarizer
The amount of effectively delaying of liquid crystal cell in lens set switches between 1/4 wavelength and 3/4 wavelength, the liquid crystal in other lens sets at different levels
The amount of effectively delaying of box switches between 0 and 1/2 wavelength.
Optionally, the electrically-controlled liquid crystal box in the present embodiment lens set can be integrated in one with polarization grating.
For above situation, referring to figs. 1 to Figure 14, wherein the present embodiment is switched outside synchronous drive with liquid crystal cell state
The principle of the switching of imaging region includes:
As shown in Figures 1 to 6, light beam selecting module uses the lens set of single-stage.As shown in Fig. 7 to Figure 14, light beam selection
Module uses the lens set of two-stage.
In Fig. 1 and single-stage lens set shown in Fig. 2, electrically-controlled liquid crystal box uses TN structure, and the electrically-controlled liquid crystal box of Fig. 1 is
High-voltage state, the electrically-controlled liquid crystal box of Fig. 2 are low-voltage state.The TN structure electrically-controlled liquid crystal box is under high-voltage state, quite
In only carrying out transmission processing to light beam, and left circularly polarized light is then converted into right-circularly polarized light under low-voltage and will be right
Rounding polarised light is converted into left circularly polarized light；Corresponding, quarter wave plate is used for the circular polarization of left-handed (i.e. clockwise)
Light converts linearly polarized photon horizontally and the circularly polarized light of dextrorotation (i.e. counterclockwise) is converted into vertical direction
Linearly polarized photon, linear polarizer use horizontal direction linear polarizer, the linear polarization of vertical direction is filtered out with this
Light.Whereby, so that electrically-controlled liquid crystal box respectively corresponds two different sons of external image under high-voltage state and low-voltage state
Region respectively enters camera lens and is ultimately imaged.
The liquid crystal cell of Fig. 3 and Fig. 4 uses ECB structure or OCB structure, and the ECB structure or OCB structure electrically-controlled liquid crystal box are one
Determine in degree, can be considered the replacement of the combination function to quarter wave plate in above-mentioned Fig. 1 and Fig. 2 Yu TN structure electrically-controlled liquid crystal box；But no
It is with place, the state specifically switched is different, it may be assumed that the ECB structure or the amount of effectively delaying of OCB structure electrically-controlled liquid crystal box are 1/
Switch between 4 wavelength and 3/4 wavelength, wherein the amount of effectively delaying of Fig. 3 is 3/4 wavelength, and the amount of effectively delaying of Fig. 4 is in 1/4 wave
It is long.
The difference of Fig. 5 and Fig. 6 and above-mentioned Fig. 3 and Fig. 4 is to exist ECB structure or OCB structure and polarization grating
It is integrated in one in manufacturing process, wherein the amount of effectively delaying of Fig. 5 is 1/4 wavelength, and the amount of effectively delaying of Fig. 6 is in 3/4 wavelength.
Single-stage lens set structure in Fig. 1 and Fig. 2 is extended to two-stage by Fig. 7 to Figure 10, and two-stage all uses TN structured liquid
Brilliant box.Wherein:
Fig. 7 show liquid crystal cell 1 in high voltage, liquid crystal cell 2 also the acquired image region pair under high-voltage state
Answer relational graph.
Fig. 8 show liquid crystal cell 1 in low-voltage, liquid crystal cell 2 also the acquired image region pair under low-voltage state
Answer relational graph.
It is corresponding in the acquired image region of low-voltage, liquid crystal cell 2 under high-voltage state that Fig. 9 show liquid crystal cell 1
Relational graph.
It is corresponding in the acquired image region of high voltage, liquid crystal cell 2 under low-voltage state that Figure 10 show liquid crystal cell 1
Relational graph.
The rest may be inferred, when the series to the lens set of similar Fig. 7 to Figure 10 is N grades, corresponding image region quantity
It is 2N。
Similarly, the single-stage lens set structure of above-mentioned Fig. 3 and Fig. 4 is extended to two-stage by Figure 11 to Figure 14, and two-stage all uses
ECB or OCB structure liquid crystal cell.Wherein:
It is adopting under 1/4 wavelength state that Figure 11, which show 1 amount of effectively delaying of liquid crystal cell by 0, liquid crystal cell, 2 amount of effectively delaying,
Collect image region corresponding relationship.
Figure 12 show that 1 amount of effectively delaying of liquid crystal cell is 1/2 wavelength, 2 amount of effectively delaying of liquid crystal cell is under 1/4 wavelength state
Acquired image region corresponding relationship.
It is adopting under 3/4 wavelength state that Figure 13, which show 1 amount of effectively delaying of liquid crystal cell by 0, liquid crystal cell, 2 amount of effectively delaying,
Collect image region corresponding relationship.
Figure 14 show that 1 amount of effectively delaying of liquid crystal cell is 1/2 wavelength, 2 amount of effectively delaying of liquid crystal cell is under 3/4 wavelength state
Acquired image region corresponding relationship.
And so on, when the series to the lens set of similar Figure 11 to Figure 14 is N grades, corresponding image region quantity
It also is 2N。
The filtered light beam module is is set to the light beam selecting module and institute by the mode that above-mentioned Fig. 1 to Figure 14 is used
It states between imaging sensor, as shown in figure 15.As a kind of deformation, those skilled in the art it is also envisioned that: it is equivalent as one kind
The light beam selecting module, can also be set between the filtered light beam module and described image sensor, such as Figure 16 by replacement
It is shown.
As shown in FIG. 17 to 22, light beam selecting module uses the lens set of single-stage.As shown in Figure 23 to Figure 30, light beam choosing
Select the lens set that module uses two-stage.
In the single-stage lens set shown in Figure 17 and Figure 18, electrically-controlled liquid crystal box uses TN structure, and the electrically-controlled liquid crystal of Figure 17
Box is high-voltage state, and the electrically-controlled liquid crystal box of Figure 18 is low-voltage state.The TN structure electrically-controlled liquid crystal box under high-voltage state,
Be equivalent to and transmission processing only carried out to light beam, and under low-voltage then by left circularly polarized light be converted into right-circularly polarized light and
Right-circularly polarized light is converted into left circularly polarized light；Corresponding, quarter wave plate is used for the circle of left-handed (i.e. clockwise)
Polarised light converts linearly polarized photon horizontally and is converted into the circularly polarized light of dextrorotation (i.e. counterclockwise) vertically
The linearly polarized photon in direction, linear polarizer use the linear polarizer of horizontal direction, filter out the linear of vertical direction with this
Polarised light.Whereby, so that electrically-controlled liquid crystal box respectively corresponds different two of external image under high-voltage state and low-voltage state
Sub-regions respectively enter camera lens and are ultimately imaged.
The liquid crystal cell of Figure 19 and Figure 20 uses ECB structure or OCB structure, and the ECB structure or OCB structure electrically-controlled liquid crystal box exist
To a certain extent, it can be considered the replacement of the combination function to quarter wave plate in above-mentioned Fig. 1 and Fig. 2 Yu TN structure electrically-controlled liquid crystal box；But
The difference is that the state specifically switched is different, it may be assumed that the ECB structure or the amount of effectively delaying of OCB structure electrically-controlled liquid crystal box exist
Switch between 1/4 wavelength and 3/4 wavelength, wherein the amount of effectively delaying of Figure 19 is 3/4 wavelength, and the amount of effectively delaying of Figure 20 is 1/4
Wavelength.
The difference of Figure 21 and Figure 22 and above-mentioned Figure 19 and Figure 20 is ECB structure or OCB structure and polarised light
Grid are integrated in one in the production process, wherein the amount of effectively delaying of Figure 21 is 3/4 wavelength, and the amount of effectively delaying of Figure 22 is 1/4
Wavelength.
Single-stage lens set structure in Figure 17 and Figure 18 is extended to two-stage by Figure 23 to Figure 26, and two-stage all uses TN structure
Liquid crystal cell.Wherein:
Figure 23 show liquid crystal cell 1 in high voltage, liquid crystal cell 2 also the acquired image region pair under high-voltage state
Answer relational graph.
Figure 24 show liquid crystal cell 1 in low-voltage, liquid crystal cell 2 also the acquired image region pair under low-voltage state
Answer relational graph.
It is corresponding in the acquired image region of low-voltage, liquid crystal cell 2 under high-voltage state that Figure 25 show liquid crystal cell 1
Relational graph.
It is corresponding in the acquired image region of high voltage, liquid crystal cell 2 under low-voltage state that Figure 26 show liquid crystal cell 1
Relational graph.
Similarly, the single-stage lens set structure of above-mentioned Figure 19 and Figure 20 is extended to two-stage by Figure 27 to Figure 30, and two-stage is all adopted
With ECB or OCB structure liquid crystal cell.Wherein:
It is adopting under 1/4 wavelength state that Figure 27, which show 2 amount of effectively delaying of liquid crystal cell by 0, liquid crystal cell, 1 amount of effectively delaying,
Collect image region corresponding relationship.
Figure 28 show that 2 amount of effectively delaying of liquid crystal cell is 1/2 wavelength, 1 amount of effectively delaying of liquid crystal cell is under 1/4 wavelength state
Acquired image region corresponding relationship.
It is adopting under 3/4 wavelength state that Figure 29, which show 2 amount of effectively delaying of liquid crystal cell by 0, liquid crystal cell, 1 amount of effectively delaying,
Collect image region corresponding relationship.
Figure 30 show that 1 amount of effectively delaying of liquid crystal cell is 1/2 wavelength, 2 amount of effectively delaying of liquid crystal cell is under 3/4 wavelength state
Acquired image region corresponding relationship.
Based on scene shown in Figure 17 to Figure 30, when by the light beam selecting module be set to the filtered light beam module with
When between described image sensor, the camera lens between described image sensor and the light beam selecting module will be set as institute
A part of filtered light beam device is stated, deflects excessive non-targeted image area after the light beam selecting module to filter out to penetrate
The incident light in domain.
Whereby, the embodiment of the present invention cooperates the state selection realization pair of electrically-controlled liquid crystal box under the deflection attribute of polarization grating
The selection of external image subregion.And the actual deployment situation of the present embodiment includes any one in following situations one or situation two
Kind mode:
Situation one, the lens set liquid crystal cell use TN structure, corresponding two states include the transmission under high voltage
Left circularly polarized light is converted into right-circularly polarized light under state and low-voltage and right-circularly polarized light is converted into left-handed circle
Polarised light；Correspondingly, the filtered light beam module further include be arranged in the linear polarizer and nearest level-one lens set it
Between quarter wave plate, wherein the position of the TN structure liquid crystal cell and the polarization grating can exchange；Or
Situation two, the lens set liquid crystal cell use ECB or OCB structure, for left circularly polarized light to be converted into the right side
Rounding polarised light and right-circularly polarized light is converted into left circularly polarized light, and: the nearest level-one with the linear polarizer
The amount of effectively delaying of liquid crystal cell in lens set switches between 1/4 wavelength and 3/4 wavelength, the liquid crystal in other lens sets at different levels
The amount of effectively delaying of box switches between 0 and 1/2 wavelength, wherein the liquid crystal in the level-one lens set nearest with linear polarizer
Box is arranged towards the linear polarizer, and the position of the liquid crystal cell in other lens sets at different levels and the polarization grating can exchange.
Optionally, the surface texture of the present embodiment polarization grating is as shown in figure 31, the liquid crystal cell structure of TN structure such as Figure 32
Shown, the liquid crystal cell structure of ECB structure is as shown in figure 33, and the liquid crystal cell structure of OCB structure is as shown in figure 34.
To sum up, image-pickup method disclosed in the present embodiment, has the advantages that
Under the cooperation of filtered light beam device, the selection of external imaging region is realized with the state switching of electrically-controlled liquid crystal box and is cut
It changes, and can be disposed with the multistage of lens set to increase the deflection of light beam and the quantity of changeable subregion, and then increase visual field
Angle.In handoff procedure, relative disPlacement motion between generating assembly, not simple and practical in structure, and deployment and operation are very convenient, whole
Performance is obviously improved.
Embodiment 2
Corresponding with above-mentioned apparatus embodiment, the present embodiment discloses a kind of image capturing system.
The present embodiment system includes:
Filtered light beam module and light beam selecting module before imaging sensor are set；
The light beam selecting module includes at least one level lens set, and lens sets at different levels are respectively by a polarization grating and one
Electrically-controlled liquid crystal box composition；Each electrically-controlled liquid crystal box is provided at least two states；And in the arrangement of all light beam selecting modules
In the state set of electrically-controlled liquid crystal box, each subsets of states corresponds the image region being not exclusively overlapped outside camera lens respectively；With
And further include:
Program-controlled unit is switched with state for the program-controlled corresponding electrically-controlled liquid crystal box and realizes adopting for respective image subregion
Collect, and in the handoff procedure of image region, not relative disPlacement motion between generating assembly.
Preferably, each polarization grating realizes beam diffraction and deflection, outgoing by the periodic structure of control material
Beam deflection angle is the vector superposed of beam incident angle and the polarization grating angle of diffraction.
Optionally, the polarization grating is also used to: incident left circularly polarized light being deflected into outgoing in deflection process
Right-circularly polarized light；And/or incident right-circularly polarized light is deflected into the left circularly polarized light of outgoing；And/or it will be incident
Non-polarized light is changed into the opposite left circularly polarized light and right-circularly polarized light of angle of diffraction.
More specifically, the transmitted light beam of the polarization grating concentrates on: incident left circularly polarized light is deflected into negative one
The order of diffraction；And/or incident right-circularly polarized light is deflected into a positive order of diffraction；And/or incident non-polarized light deflection is positive
The left circularly polarized light of one order of diffraction and the right-circularly polarized light of the negative one order of diffraction.
Optionally, the polarization grating optical property modified material is made of liquid crystal, liquid crystal polymer；Or the polarization
Grating optical property modified material surpasses surface by metal or the super surface of medium is made.
In the present embodiment, optionally, may is that the filtered light beam module be set to the light beam selecting module with it is described
Between imaging sensor.Be also possible to: the light beam selecting module is set to the filtered light beam module and described image senses
Between device.
In specific application scenarios, the filtered light beam module includes linear polarizer.
Further: when by the filtered light beam module be set to the light beam selecting module and described image sensor it
Between when, the filtered light beam device further includes the camera lens being arranged between described image sensor and the linear polarizer, use
The incident light that excessive non-targeted image region is deflected after the linear polarizer is penetrated in filtering out.Or: when by institute
When stating light beam selecting module and being set between the filtered light beam module and described image sensor, setting is passed in described image
The a part of camera lens as the filtered light beam device between sensor and the light beam selecting module, with filter out penetrate it is described
The incident light in excessive non-targeted image region is deflected after light beam selecting module.
Similarly, TN structure can be used in the liquid crystal cell of the present embodiment lens set, and corresponding two states include under high voltage
Left circularly polarized light is converted into right-circularly polarized light under transmissive state and low-voltage and right-circularly polarized light is converted into a left side
Rounding polarised light；Correspondingly, the filtered light beam module further includes the eyeglass that the linear polarizer Yu nearest level-one is arranged in
Quarter wave plate between group.
Alternatively, the liquid crystal cell of the present embodiment lens set uses ECB or OCB structure, for left circularly polarized light to be converted into
Right-circularly polarized light and right-circularly polarized light is converted into left circularly polarized light, and: one nearest with the linear polarizer
The amount of effectively delaying of liquid crystal cell in grade lens set switches between 1/4 wavelength and 3/4 wavelength, the liquid in other lens sets at different levels
The amount of effectively delaying of brilliant box switches between 0 and 1/2 wavelength.
Preferably, the electrically-controlled liquid crystal box in the present embodiment lens set is integrated in one with polarization grating.
Similarly, image capturing system disclosed in the present embodiment, has the advantages that
Under the cooperation of filtered light beam device, the selection of external imaging region is realized with the state switching of electrically-controlled liquid crystal box and is cut
It changes, and can be disposed with the multistage of lens set to increase the deflection of light beam and the quantity of changeable subregion, and then increase visual field
Angle.In handoff procedure, relative disPlacement motion between generating assembly, not simple and practical in structure, and deployment and operation are very convenient, whole
Performance is obviously improved.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (22)
1. a kind of image-pickup method characterized by comprising
Filtered light beam module and light beam selecting module are set before imaging sensor；The light beam selecting module includes at least one
Grade lens set, lens sets at different levels are made of a polarization grating and an electrically-controlled liquid crystal box respectively；Each electrically-controlled liquid crystal box is set
It is equipped at least two states；And in the state set of the electrically-controlled liquid crystal box in the arrangement of all light beam selecting modules, each subsets of states
The image region being not exclusively overlapped outside camera lens is corresponded respectively；
The program-controlled corresponding electrically-controlled liquid crystal box switches the acquisition for realizing respective image subregion with state, and in image region
Handoff procedure in, not relative disPlacement motion between generating assembly.
2. image-pickup method according to claim 1, which is characterized in that each polarization grating passes through control material
Periodic structure realizes beam diffraction and deflection, and outgoing beam deflection angle is the vector of beam incident angle and the polarization grating angle of diffraction
Superposition.
3. image-pickup method according to claim 2, which is characterized in that the polarization grating is also used to: deflecting past
Incident left circularly polarized light is deflected into the right-circularly polarized light of outgoing in journey；And/or
Incident right-circularly polarized light is deflected into the left circularly polarized light of outgoing；And/or
Incident non-polarized light is changed into the opposite left circularly polarized light and right-circularly polarized light of angle of diffraction.
4. image-pickup method according to claim 3, which is characterized in that the transmitted light beam of the polarization grating is concentrated
:
Incident left circularly polarized light is deflected into the negative one order of diffraction；And/or
Incident right-circularly polarized light is deflected into a positive order of diffraction；And/or
Incident non-polarized light is deflected to the left circularly polarized light for the order of diffraction that is positive and the right-circularly polarized light of the negative one order of diffraction.
5. image-pickup method according to claim 4, which is characterized in that the polarization grating optical property modified material
It is made of liquid crystal, liquid crystal polymer.
6. image-pickup method according to claim 4, which is characterized in that affiliated polarization grating optical property modified material
Surface can be surpassed by metal or the super surface of medium is made.
7. image-pickup method according to any one of claims 1 to 6, which is characterized in that set the filtered light beam module
It is placed between the light beam selecting module and described image sensor；Or
The light beam selecting module is set between the filtered light beam module and described image sensor.
8. image-pickup method according to claim 7, which is characterized in that the filtered light beam module includes linear polarization
Piece.
9. image-pickup method according to claim 8, which is characterized in that further include:
When the filtered light beam module to be set between the light beam selecting module and described image sensor, setting is existed
The a part of camera lens as the filtered light beam device between described image sensor and the linear polarizer, to filter out
Penetrate the incident light that the linear polarizer deflects excessive non-targeted image region later；Or
When the light beam selecting module to be set between the filtered light beam module and described image sensor, setting is existed
The a part of camera lens as the filtered light beam device between described image sensor and the light beam selecting module, with filtering
Fall to penetrate the incident light that the light beam selecting module deflects excessive non-targeted image region later.
10. image-pickup method according to claim 8, which is characterized in that including in following situations one or situation two
Any one mode:
Situation one, the lens set liquid crystal cell use TN structure, corresponding two states include the transmissive state under high voltage
With left circularly polarized light is converted into right-circularly polarized light under low-voltage and right-circularly polarized light is converted into Left-hand circular polarization
Light；Correspondingly, the filtered light beam module further includes being arranged between the linear polarizer and the lens set of nearest level-one
Quarter wave plate, wherein the position of the TN structure liquid crystal cell and the polarization grating can exchange；Or
Situation two, the lens set liquid crystal cell use ECB or OCB structure, for by left circularly polarized light be converted into dextrorotation circle
Polarised light and right-circularly polarized light is converted into left circularly polarized light, and: the level-one eyeglass nearest with the linear polarizer
The amount of effectively delaying of liquid crystal cell in group switches between 1/4 wavelength and 3/4 wavelength, the liquid crystal cell in other lens sets at different levels
The amount of effectively delaying switches between 0 and 1/2 wavelength, wherein the liquid crystal cell face in the level-one lens set nearest with linear polarizer
It is arranged to the linear polarizer, the position of liquid crystal cell and the polarization grating in other lens sets at different levels can exchange.
11. image-pickup method according to claim 10, which is characterized in that further include:
Electrically-controlled liquid crystal box in the lens set is integrated in one with polarization grating.
12. a kind of image capturing system characterized by comprising
Filtered light beam module and light beam selecting module before imaging sensor are set；
The light beam selecting module includes at least one level lens set, and lens sets at different levels are automatically controlled by a polarization grating and one respectively
Liquid crystal cell composition；Each electrically-controlled liquid crystal box is provided at least two states；And in the automatically controlled of all light beam selecting modules arrangement
In the state set of liquid crystal cell, each subsets of states corresponds the image region being not exclusively overlapped outside camera lens respectively；And also
Include:
Program-controlled unit switches the acquisition for realizing respective image subregion for the program-controlled corresponding electrically-controlled liquid crystal box with state,
And in the handoff procedure of image region, not relative disPlacement motion between generating assembly.
13. image capturing system according to claim 12, which is characterized in that each polarization grating passes through control material
Periodic structure realize beam diffraction and deflection, outgoing beam deflection angle is the arrow of beam incident angle and the polarization grating angle of diffraction
Amount superposition.
14. image capturing system according to claim 13, which is characterized in that the polarization grating is also used to: deflecting
Incident left circularly polarized light is deflected into the right-circularly polarized light of outgoing in the process；And/or
Incident right-circularly polarized light is deflected into the left circularly polarized light of outgoing；And/or
Incident non-polarized light is changed into the opposite left circularly polarized light and right-circularly polarized light of angle of diffraction.
15. image capturing system according to claim 13, which is characterized in that the transmitted light beam of the polarization grating is concentrated
:
Incident left circularly polarized light is deflected into the negative one order of diffraction；And/or
Incident right-circularly polarized light is deflected into a positive order of diffraction；And/or
Incident non-polarized light is deflected to the left circularly polarized light for the order of diffraction that is positive and the right-circularly polarized light of the negative one order of diffraction.
16. image capturing system according to claim 15, which is characterized in that the modified material of the polarization grating optical property
Material is made of liquid crystal, liquid crystal polymer.
17. image capturing system according to claim 15, which is characterized in that the modified material of affiliated polarization grating optical property
Material can surpass surface by metal or the super surface of medium is made.
18. 2 to 17 any image capturing system according to claim 1, which is characterized in that the filtered light beam module is set
It is placed between the light beam selecting module and described image sensor；Or
The light beam selecting module is set between the filtered light beam module and described image sensor.
19. image capturing system according to claim 18, which is characterized in that the filtered light beam module includes linear inclined
Shake piece.
20. image capturing system according to claim 19, which is characterized in that further include:
When the filtered light beam module to be set between the light beam selecting module and described image sensor, setting is existed
The a part of camera lens as the filtered light beam device between described image sensor and the linear polarizer, to filter out
Penetrate the incident light that the linear polarizer deflects excessive non-targeted image region later；Or
When the light beam selecting module to be set between the filtered light beam module and described image sensor, setting is existed
The a part of camera lens as the filtered light beam device between described image sensor and the light beam selecting module, with filtering
Fall to penetrate the incident light that the light beam selecting module deflects excessive non-targeted image region later.
21. image capturing system according to claim 19, which is characterized in that including in following situations one or situation two
Any one deployment way:
Situation one, the lens set liquid crystal cell use TN structure, corresponding two states include the transmissive state under high voltage
With left circularly polarized light is converted into right-circularly polarized light under low-voltage and right-circularly polarized light is converted into Left-hand circular polarization
Light；Correspondingly, the filtered light beam module further includes being arranged between the linear polarizer and the lens set of nearest level-one
Quarter wave plate, wherein the position of the TN structure liquid crystal cell and the polarization grating can exchange；Or
Situation two, the lens set liquid crystal cell use ECB or OCB structure, for by left circularly polarized light be converted into dextrorotation circle
Polarised light and right-circularly polarized light is converted into left circularly polarized light, and the level-one eyeglass nearest with the linear polarizer
The amount of effectively delaying of liquid crystal cell in group switches between 1/4 wavelength and 3/4 wavelength, the liquid crystal cell in other lens sets at different levels
The amount of effectively delaying switches between 0 and 1/2 wavelength, wherein the liquid crystal cell face in the level-one lens set nearest with linear polarizer
It is arranged to the linear polarizer, the position of liquid crystal cell and the polarization grating in other lens sets at different levels can exchange.
22. image capturing system according to claim 21, which is characterized in that electrically-controlled liquid crystal box in the lens set with
Polarization grating is integrated in one.
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