CN104184954B - Optical detection apparatus and its synchronization adjustment method - Google Patents
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- CN104184954B CN104184954B CN201310201836.3A CN201310201836A CN104184954B CN 104184954 B CN104184954 B CN 104184954B CN 201310201836 A CN201310201836 A CN 201310201836A CN 104184954 B CN104184954 B CN 104184954B
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Abstract
The invention discloses a kind of synchronization adjustment method of optical detection apparatus, for by the flicker sequential of the exposure time series reference synchronization light source of imaging sensor.Methods described includes following predetermined period to obtain consecutive image group, analyze the brightness change of the consecutive image group, and change the exposure time series for adjusting described image sensor according to the brightness, so that the flicker sequential of the synchronous reference light source of the exposure time series of described image sensor.The present invention is not required to set extra signal receiver in reference light source, the control unit of optical detection apparatus can directly adjust the exposure time series of imaging sensor according to acquired reference point flicker state, reach the timing synchronization of imaging sensor and reference light source, therefore component count and manufacturing cost can be effectively reduced, improve the competitiveness of product in market.
Description
Technical field
The present invention relates to a kind of optical detection apparatus, more particularly to a kind of optical detection apparatus with low cost and its together
Step adjusting method.
Background technology
In order to resist background light source noise, traditional optical detection apparatus would generally use the reference for having specific flicker frequency
Point, facilitates optical detection apparatus to filter out noise.In order to allow imaging sensor to obtain the reference point of the specific flicker frequency, according to
It is whether synchronous according to the exposure time series of imaging sensor and the flicker sequential of reference point, two kinds of synchronous flashing and asynchronous flicker can be divided into
Method for detecting.Traditional synchronous flashing technology first sends signal by optical detection apparatus, and the signal is by the sending and receiving end of reference point
After reception, then basis signal receives the flicker sequential of time adjustment reference point, the exposure time series for making it be synchronized with imaging sensor.
But the method need to have the shortcomings that costly in reference point setting signal transceiver.
The content of the invention
The present invention provides a kind of optical detection apparatus and its synchronization adjustment method with low cost, to solve above-mentioned ask
Topic.
The present invention discloses a kind of synchronization adjustment method of optical detection apparatus, for the exposure time series of imaging sensor are same
Walk the flicker sequential in reference light source.Methods described includes following predetermined period to obtain consecutive image group, analyzes the sequential chart
As the brightness change of group, and change the exposure time series for adjusting described image sensor according to the brightness, so that described image
The flicker sequential of the synchronous reference light source of the exposure time series of sensor.
Invention additionally discloses a kind of optical detection apparatus, for reading reference light source to filter out noise.The optical detecting
Device includes imaging sensor and control unit.Described image sensor follows predetermined period to obtain consecutive image group.It is described
Control unit electrically connects described image sensor.The brightness that described control unit analyzes the consecutive image group changes, and according to
The exposure time series of the brightness change adjustment described image sensor, are synchronized with the exposure time series for adjusting described image sensor
The flicker sequential of the reference light source.
Invention additionally discloses a kind of optical detection apparatus, for reading reference light source to filter out noise.The optical detecting
Device includes imaging sensor and control unit.Imaging sensor, with first, second operator scheme, wherein the first operation
The exposure time series of pattern are more than the exposure time series of the second operator scheme.Described control unit electrical connection described image sensing
Device, and described image sensor operation is controlled in the first operator scheme, to follow predetermined period to obtain consecutive image group.Institute
The brightness change that control unit also analyzes the consecutive image group is stated, is changed according to the brightness and adjusts described image sensor
Exposure time series, so that the flicker sequential of the synchronous reference light source of the exposure time series of described image sensor.Wherein, the control
Unit is after the exposure time series of described image sensor are synchronized with the flicker sequential of the reference light source, control described image sensing
Device is operated in the second operator scheme.
The present invention is not required to set extra signal receiver in reference light source, and the control unit of optical detection apparatus can foundation
Acquired reference point flicker state directly adjusts the exposure time series of imaging sensor, reaches imaging sensor and reference light source
Timing synchronization, therefore component count and manufacturing cost can be effectively reduced, improve the competitiveness of product in market.
Brief description of the drawings
Fig. 1 is the function block schematic diagram of the optical detection apparatus of the embodiment of the present invention.
Fig. 2A, Fig. 2 B, Fig. 2 C are respectively the imaging sensor of the embodiment of the present invention and the sequential ratio of reference light source
Relatively scheme.
Fig. 3 is the flow chart of the timing synchronization for adjusting imaging sensor and reference light source of the embodiment of the present invention.
Wherein, description of reference numerals is as follows：
The electronic installation of 10 optical detection apparatus 12
The imaging sensor of 14 reference light source 16
The database of 18 control unit 20
R reference values the first parameters of R1
R2 the second parameter T chronomeres
Step 300,302,304,306,308,310,312,314
Embodiment
Referring to Fig. 1, function block schematic diagrams of the Fig. 1 for the optical detection apparatus 10 of the embodiment of the present invention.Optical detecting
Device 10 controls electronic installation 12 by optical signalling.In order to be effective against the ambient noise in environment, electronic installation 12 has
Reference light source 14, to facilitate optical detection apparatus 10 to filter out noise.Optical detection apparatus 10 includes imaging sensor 16, control list
Member 18 and database 20, the electrical connection imaging sensor 16 of control unit 18 and database 20.
The optical detection apparatus 10 of the present invention can be bright using the image obtained by the detecting reference light source 14 of imaging sensor 16
The dutycycle of reference light source 14 is learnt in degree change, and then judges the flicker of the exposure time series and reference light source 14 of imaging sensor 16
Whether sequential is synchronous；Then, then read preset reference value movement images brightness change, when finding out the exposure of imaging sensor 16
The phase difference of sequence and the flicker sequential of reference light source 14, for synchronizing adjustment.
Specifically, imaging sensor 16 can follow predetermined period to obtain consecutive image group, and the consecutive image group includes
The brightness change information of reference light source 14.Control unit 18 then may compare the bright of a reference value R and the consecutive image group
Degree change, and according to the exposure time series of comparative result mobile image sensor 16, whereby by the exposure time series of imaging sensor 16
It is adjusted to be synchronized with the flicker sequential of reference light source 14, wherein reference value R can be previously stored among database 20, or storage
Among a buffer (register) or other storage assemblies.
Because each image of the consecutive image group all has multiple luminance parameters, for the ease of calculating, the present invention
It preferably can in advance be dealt with for every image, brightness is represented from every image acquirement is one or more.Again by the sequential chart
Multigroup after simplifying as group represents brightness and is compared relative to reference value R, to become from multigroup intensity for representing brightness or order
Change to judge whether exposure time series and flicker sequential are synchronous.
The mode dealt with advance to image for example can first set the array of pixels of imaging sensor 16 by control unit 18
Regional area or Zone Full, several pixel columns of such as the top add the brightness value of all pixels of this regional area
Always, that is, the representative brightness of every image is obtained.Before not yet timing synchronization adjustment is carried out, the exposure time series of imaging sensor 16 can
Can the synchronous or asynchronous flicker sequential in reference light source 14, therefore the multigroup of consecutive image group represent brightness and have several differences
Brightness value changes or brightness arrangement change, control unit 18 further according to consecutive image group it is bright secretly come be retarded or advanced image pass
The exposure time series of sensor 16, to be synchronized with the flicker sequential of reference light source 14.
Reference value R is set according to the difference of magnification of exposure time series and the flicker sequential of reference light source 14 of imaging sensor 16
Meter, and need first to carry out reference value R setting and storage before adjustment is synchronized.Referring to Fig. 2, Fig. 2 is the embodiment of the present invention
Imaging sensor 16 and the sequential of reference light source 14 compare figure.The exposure time series of imaging sensor 16 may preferably be reference light
The integral multiple of the flicker sequential in source 14.For example, as shown in Figure 2 A, the exposure time series of imaging sensor 16 can be in each two
Between unit (T) exposure once, its dutycycle be equal to 50 percent；The flicker sequential of reference light source 14 can be the three of exposure time series
Times, and flash the dutycycle of sequential and be preferably slightly greater than 50 percent.
Reference value R may include a first parameter R1 and multiple second parameter R2, to represent acquired image in difference
Luminance standard under synchronous regime.For example, the first parameter R1 changes for the brightness of exposure time series synchronous flashing sequential, image
The each exposure cycle of sensor 16 all can completely fall in the enable area or disabled area of reference light source 14, therefore the first parameter R1
By rearranging for all light image and complete dark image.On the other hand, the second parameter R2 is the asynchronous flicker sequential of exposure time series
Brightness changes, and the exposure cycle that imaging sensor 16 can once above is located in the enable area and disabled area of reference light source 14
Centre, therefore the second parameter R2 is made up of the arrangement of all light image, complete dark image and the complete dark image of non-all light.Because image is passed
The exposure time series of sensor 16 may be faster or slower than the flicker sequential of reference light source 14 in first start, therefore optical detection apparatus 10
First a variety of possible difference of injection time (implying that the first parameter R1 and the second parameter R2) are preset in database 20 for follow-up ratio
To checking.
As shown in Figure 2 A, the exposure time series of imaging sensor 16 are synchronized with the flicker sequential of reference light source 14, therefore image
Sensor 16 can just get reference light source 14 in the first two exposure time zone, and the first parameter R1 is all light image, all light image
And the arrangement of complete dark image.As shown in Figure 2 B, the exposure time series of imaging sensor 16 are faster than the flicker sequential of reference light source 14, because
The reference light source 14 of second exposure time zone only fetching portion of this imaging sensor 16 per consecutive image group, during the 3rd exposure
Area can not get reference light source 14, and predeterminable the second parameter of one of which R2 is all light image, half bright image and complete dark image
Arrangement.As shown in Figure 2 C, the exposure time series of imaging sensor 16 are slower than the flicker sequential of reference light source 14, therefore image sensing
The reference light source 14 of first exposure time zone only fetching portion of the device 16 per consecutive image group, the 3rd exposure time zone can not be obtained
To reference light source 14, therefore another group of the second parameter R2 is preset as the arrangement of half bright image, all light image and complete dark image.
As shown in Figures 1 and 2, control unit 18 is used for analyzing each image of consecutive image group (during three exposures as the aforementioned
Area) partial pixel total luminance value or average brightness value change, for example can first set the region to be obtained in image, then
The brightness value of all pixels adds up or is averaged to obtain a numerical value in the region.Furthermore, control unit 18 further may be used also
The brightness arrangement change of each image of consecutive image group is analyzed, the staggered row of all light image, half bright image and complete dark image is implied that
Row change, for comparing the first parameter R1 or the second parameter R2 whether it meets reference value R.Wherein, imaging sensor 16
The difference of magnification end of the flicker sequential of exposure time series and reference light source 14 is not limited to described in previous embodiment depending on setting demand
Three times difference of injection time, and reference value R the first parameter R1 and the second parameter R2 also according to imaging sensor 16 and reference light source 14
Sequential difference of magnification and have respective change, so no longer chatting one by one in detail bright.
Fig. 2 and Fig. 3 are referred to, Fig. 3 is synchronized with ginseng for the exposure time series of the adjustment imaging sensor 16 of the embodiment of the present invention
Examine the flow chart of the flicker sequential of light source 14.Synchronization adjustment method shown in Fig. 3 is useful in the optical detection apparatus shown in Fig. 1
10.First, step 300 is performed, imaging sensor 16 obtains the consecutive image group of tool reference light source 14.Then, step 302 is performed
To step 304, the brightness change of the analysis consecutive image group of control unit 18, parallel machine to database 20 reads reference value R.Connect
, perform step 306, whether the brightness change that control unit 18 can first compare consecutive image group meets the first parameter R1, if two
Person is consistent, and represents that the exposure time series of imaging sensor 16 have been synchronized with the flicker sequential of reference light source 14, as shown in Figure 2 A.Therefore
Step 308 is performed, the exposure time series of imaging sensor 16 are not adjusted.Wherein, the first parameter R1 can be consecutive image group most
Big brightness value or most uniform luminance value, or it is default bright according to the sequential difference of magnification of imaging sensor 16 and reference light source 14
Degree arrangement.
On the other hand, if the brightness change of consecutive image group does not meet the first parameter R1, step 310 is performed, the is compared
Two parameter R2 and the brightness of consecutive image group are arranged.Because reference value R may include multiple second parameter R2, and difference second is joined
Number R2 has different image light and shade arrangement changes, therefore the brightness arrangement according to consecutive image group is found out phase by control unit 18
Second parameter R2 of symbol.Then, step 312 and step 314 are performed, control unit 18 chooses the of tool same brightness arrangement change
Two parameter R2, and be the exposure time series of imaging sensor 16 to be advanced or delayed according to this second parameter R2 decisions.Such as Fig. 2 B institutes
Show, when the brightness for picking out consecutive image group is arranged as the sequential combination of all light image, half bright image and complete dark image, control
Unit 18 can delayed image sensor 16 exposure time series, until imaging sensor 16 gets two all light images, that is, represent
The exposure time series of imaging sensor 16 are adjusted to be synchronized with the flicker sequential of reference light source 14.As shown in Figure 2 C, identification is worked as
When the brightness for going out consecutive image group is arranged as the sequential combination of half bright image, all light image and complete dark image, control unit 18 can
Exposure time series of imaging sensor 16 in advance so that imaging sensor 16 can get two all light images, and be synchronized with reference
The flicker sequential of light source 14.
So, the flicker sequential and the feelings of dutycycle of optical detection apparatus 10 of the invention in known reference light source 14
, can be according to the brightness value of consecutive image group acquired in imaging sensor 16 and brightness arrangement change adjustment imaging sensor 16 under shape
Exposure time series.Each sequential adjustment can be 1/3rd or a quarter chronomere, then perform again shown in Fig. 3
Flow, progressively the exposure time series of mobile image sensor 16 are to be synchronized with the flicker sequential of reference light source 14.It is same in order to accelerate
The efficiency of successive step, the present invention can also drive imaging sensor 16 to draw high its exposure time series by control unit 18.Specifically,
Imaging sensor 16 can have first operator scheme and second operator scheme, and the exposure time series of first operator scheme are more than the
The exposure time series of two operator schemes.When optical detection apparatus 10 just starts, the control imaging sensor 16 of control unit 18 is operated
First operator scheme, is adjusted with the timing synchronization for quickly carrying out imaging sensor 16 and reference light source 14.In imaging sensor 16
Exposure time series reference synchronization light source 14 flicker sequential after, control unit 18 control imaging sensor 16 operation second operate
Pattern, takes into account purpose of the Fast synchronization adjustment with saving energy resource consumption whereby.
If optical detection apparatus 10 is hand-held indicator device, reference light source 14 is the reference point of display screen, the present invention
It is not required to go processing synchronizing signal feedback in the extra signal receiver of display screen installing, optical detection apparatus 10 can direct basis
The flicker state for the reference light source 14 that imaging sensor 16 is got, adjusts the exposure time series of imaging sensor 16 to reach synchronization
Effect.In addition, if optical detection apparatus 10 is the optical sensor of Touch Screen, reference light source 14 is the active of stylus
Light source, stylus is also not required to extra signal receiver.Optical detection apparatus 10 is when carrying out timing synchronization adjustment, first
Imaging sensor 16 is operated and scanned in first operator scheme with high-frequency mode progress detecting, now optical detection apparatus 10 is only true
Recognize in image and whether have more than the pixel of brightness door, without going the pixel center of gravity for being calculated over brightness door (to imply that and do not calculate
The position of stylus), until optical detection apparatus 10 is completed after the timing synchronization adjustment of relative reference light source 14, just control image
Sensor 16, which is operated, carries out follow-up center of gravity calculation in second operator scheme.
Prior art is compared, the present invention is not required to set extra signal receiver in reference light source, optical detection apparatus
Control unit can directly adjust the exposure time series of imaging sensor according to acquired reference point flicker state, reach image sensing
The timing synchronization of device and reference light source, therefore component count and manufacturing cost can be effectively reduced, improve the competitiveness of product in market.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (25)
1. a kind of synchronization adjustment method of optical detection apparatus, for the exposure time series of imaging sensor are synchronized with into reference light source
Flicker sequential, it is characterised in that methods described includes：
Predetermined period is followed to obtain consecutive image group；
Analyze the brightness change of the consecutive image group；And
Change the exposure time series of adjustment described image sensor according to the brightness, so that the exposure time series of described image sensor
The flicker sequential of the synchronous reference light source；
Wherein, the exposure time series for changing adjustment described image sensor according to the brightness include：A preset reference value is read, and
Brightness change is compared with the reference value, during foundation exposure of the comparative result to move described image sensor
Sequence；
Wherein, the reference value has the first parameter, and first parameter is the arrangement change of all light image and complete dark image.
2. the method as described in claim 1, it is characterised in that methods described also includes：
Set the regional area of the array of pixels of described image sensor；
Add up the brightness value of the regional area all pixels.
3. method as claimed in claim 2, it is characterised in that the brightness change includes each image of the consecutive image group
Partial pixel total luminance value or average brightness value brightness change, and/or each image of the consecutive image group brightness
Arrangement change.
4. the method as described in claim 1, it is characterised in that the reference value further has the second parameter, described second
Parameter is the arrangement change of all light image, complete dark image and the complete dark image of non-all light.
5. the method as described in claim 1, it is characterised in that methods described also includes：
When the brightness value of the consecutive image group meets first parameter, the exposure time series for the described image sensor that unshifts.
6. the method as described in claim 1, it is characterised in that methods described also includes：
Meet first parameter when the brightness of the consecutive image group is arranged, during the exposure for the described image sensor that unshifts
Sequence.
7. method as claimed in claim 4, it is characterised in that methods described also includes：
When the brightness change of the consecutive image group does not meet first parameter, the brightness arrangement of the consecutive image group is analyzed
To compare second parameter；And
According to analysis result come the exposure time series of displacement described image sensor.
8. method as claimed in claim 7, it is characterised in that the reference value includes multiple second parameters, and methods described is also
Including：
One of them second ginseng of the brightness arrangement of the identical consecutive image group is chosen in the multiple second parameter
Number；And
Determine to be advanced or delayed the exposure time series of described image sensor according to the second parameter of the selection.
9. the method as described in claim 1, it is characterised in that methods described also includes：
The ginseng is designed according to the difference of magnification of the flicker sequential of exposure time series and the reference light source of described image sensor
Examine value；And
The reference value is stored in database before adjustment is synchronized.
10. method as claimed in claim 6, it is characterised in that the exposure time series of described image sensor are the reference light
The integral multiple of the flicker sequential in source.
11. the method as described in claim 1, it is characterised in that the dutycycle of the flicker sequential is more than 50 percent.
12. the method as described in claim 1, it is characterised in that methods described also includes：
The exposure time series of described image sensor are improved to obtain multiple images.
13. a kind of optical detection apparatus, for reading reference light source to filter out noise, it is characterised in that the optical detecting dress
Put including：
Imaging sensor, described image sensor follows predetermined period to obtain consecutive image group；And
Control unit, electrically connects described image sensor, and described control unit analyzes the brightness change of the consecutive image group, and
Change the exposure time series of adjustment described image sensor according to the brightness, it is same with the exposure time series for adjusting described image sensor
Walk the flicker sequential in the reference light source；Wherein, the exposure time series of adjustment described image sensor are described to be advanced or delayed
The exposure time series of imaging sensor；
Described control unit connects to a database and reads a reference value, and then the reference value changes with the brightness,
To move the exposure time series of described image sensor according to comparative result.
14. optical detection apparatus as claimed in claim 13, it is characterised in that described control unit setting described image sensing
The regional area of the array of pixels of device, and add up the regional area all pixels to obtain brightness value.
15. optical detection apparatus as claimed in claim 14, it is characterised in that described control unit analyzes the consecutive image
The brightness change of the total luminance value or average brightness value of the partial pixel of each image of group, and/or the consecutive image group each figure
The brightness arrangement change of picture.
16. optical detection apparatus as claimed in claim 13, it is characterised in that the reference value has the first parameter, described
First parameter is the arrangement change of all light image and complete dark image.
17. optical detection apparatus as claimed in claim 16, it is characterised in that the reference value further has the second ginseng
Number, second parameter is the arrangement change of all light image, complete dark image and the complete dark image of non-all light.
18. optical detection apparatus as claimed in claim 16, it is characterised in that described control unit is in the consecutive image group
Brightness value when meeting first parameter, the exposure time series for the described image sensor that unshifts.
19. optical detection apparatus as claimed in claim 16, it is characterised in that described control unit is in the consecutive image group
Brightness arrangement when meeting first parameter, the exposure time series for the described image sensor that unshifts.
20. optical detection apparatus as claimed in claim 17, it is characterised in that described control unit is when the consecutive image
When the brightness change of group does not meet first parameter, the brightness for analyzing the consecutive image group arranges to compare second ginseng
Number, and according to analysis result come the exposure time series of displacement described image sensor.
21. optical detection apparatus as claimed in claim 20, it is characterised in that the reference value includes multiple second parameters,
Described control unit chosen in the multiple second parameter be same as the consecutive image group the brightness arrangement wherein
One the second parameter, the exposure time series of described image sensor are advanced or delayed further according to the second parameter of the selection.
22. optical detection apparatus as claimed in claim 13, it is characterised in that the reference value is according to described image sensor
Exposure time series and the flicker sequential of the reference light source difference of magnification and design, and be stored in institute before adjustment is synchronized
State in database.
23. optical detection apparatus as claimed in claim 22, it is characterised in that the exposure time series of described image sensor are institute
State the integral multiple of the flicker sequential of reference light source.
24. optical detection apparatus as claimed in claim 13, it is characterised in that the dutycycle of the flicker sequential is more than percentage
50.
25. optical detection apparatus as claimed in claim 13, it is characterised in that described control unit driving described image sensing
Device improves exposure time series to obtain multiple images.
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| CN107864352A (en) * | 2017-10-10 | 2018-03-30 | 惠州Tcl移动通信有限公司 | A kind of method, mobile terminal and storage medium for eliminating video frames cycle vibration |
| CN109005365B (en) * | 2018-08-22 | 2020-12-08 | 浙江大华技术股份有限公司 | Method and device for controlling starting of light supplement lamp |
| CN112668425B (en) * | 2020-12-18 | 2022-11-01 | 深圳市汇顶科技股份有限公司 | Fingerprint detection method, fingerprint sensor and electronic equipment |
| EP4064115B1 (en) | 2020-12-18 | 2024-08-14 | Shenzhen Goodix Technology Co., Ltd. | Fingerprint detection method, fingerprint sensor and electronic device |
| CN113899312B (en) * | 2021-09-30 | 2022-06-21 | 苏州天准科技股份有限公司 | Image measuring equipment and image measuring method |
| CN113974526B (en) * | 2021-11-18 | 2025-08-26 | 上海澳华内镜股份有限公司 | Automatic dimming and stroboscopic light source device and endoscope |
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| CN1870727A (en) * | 2005-05-27 | 2006-11-29 | 佛山市顺德区顺达电脑厂有限公司 | Correction method for flash frequency |
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| CN102298452A (en) * | 2010-06-22 | 2011-12-28 | 原相科技股份有限公司 | Method for adjusting exposure conditions of optical sensing module and its optical sensing module |
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| US7920175B2 (en) * | 2005-01-13 | 2011-04-05 | Canon Kabushiki Kaisha | Electronic still camera performing composition of images and image capturing method therefor |
| US8068148B2 (en) * | 2006-01-05 | 2011-11-29 | Qualcomm Incorporated | Automatic flicker correction in an image capture device |
| TWI401963B (en) * | 2009-06-25 | 2013-07-11 | Pixart Imaging Inc | Dynamic image compression method for face detection |
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| CN1870727A (en) * | 2005-05-27 | 2006-11-29 | 佛山市顺德区顺达电脑厂有限公司 | Correction method for flash frequency |
| CN101026694A (en) * | 2007-04-06 | 2007-08-29 | 北京中星微电子有限公司 | Method, device for removing pickup lens image scintillation and pickup lens |
| CN102298452A (en) * | 2010-06-22 | 2011-12-28 | 原相科技股份有限公司 | Method for adjusting exposure conditions of optical sensing module and its optical sensing module |
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