CN103369346B - Dynamic imaging line scan camera scaling method - Google Patents
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Abstract
The present invention relates to a kind of associated image technology in Machine Vision Detection field.A kind of dynamic imaging line scan camera scaling method, demarcates servicing unit and is placed on line scan camera position to be imaged by line scan camera; Cylinder (2) is tangent with the plane that is taken (5) of subject, and tangent line is camera imaging face; Stick the paper with scale marker or pattern at roll circumference outer surface, start dynamic rotation mechanism (1) and drive drum rotating, the imaging of line scan camera (7) aligns with drum bus; Cylinder bus, camera, light source (6) match and form imaging angle; Camera imaging under the time for exposure of presetting and picking rate Parameter Conditions; The rotary speed of adjustment cylinder and IMAQ speeds match, obtain set imaging resolution; Pattern in roll circumference is taken into continuous print visual image by line scan camera; Regulate camera lens gradually, the image contrast of line of observation scanning camera and definition, until collecting clearly till image.
Description
Technical field
The present invention relates to Machine Vision Detection field, particularly relate to a kind of a kind of householder method adjusted based on camera focus in line scan camera imaging and position.
Background technology
Line scan camera is widely used in continuous band imaging field, has the advantages such as applicable high-speed image sampling, photosensitive property are good, high-resolution.In use, the problem of adjustment camera blur-free imaging perplexs it always and applies smoothly line scan camera.To relative motion be there is between subject and camera when the image-forming principle of line scan camera requires camera imaging, and only have the movement velocity of subject and image taking speed just can obtain clear, all even stable image under the condition of coupling mutually.
The demarcation of usual line scan camera is completed stationary body imaging by camera, stationary body exists the obvious border of luminance difference, the definition of the border imaging that contrast differs greatly in the image gathered also observed by adjustment camera, judge whether camera adjusts to optimum state, adjusted to zone of reasonableness by imaging object distance.Chinese patent 200810167595.4 and 200710047426.2 is all realization and the application of this thought.The method to a certain extent can only be more rough observation camera imaging effect clearly, and be difficult to the accurate adjustment realizing camera.
Summary of the invention
The object of the present invention is to provide a kind of dynamic imaging line scan camera scaling method, the method carrys out the imaging of boost line scanning camera to simulate continuous band relative motion, whether adjusts to optimum state by intuitively arriving image effect determination line scan camera.
For achieving the above object, present invention employs following technical scheme:
A kind of dynamic imaging line scan camera scaling method, the steps include:
The first, line scan camera is demarcated servicing unit and be placed on line scan camera position to be imaged; The service position of camera when described camera position to be imaged refers to that camera normally works, matches at this position camera, light source and subject and forms imaging angle; Described line scan camera is demarcated servicing unit and is comprised: dynamic rotation mechanism, cylinder, support and encoder, cylinder is arranged on two side stands, dynamic rotation mechanism drives drum rotating, and encoder is arranged in the rotating shaft that rotates together with cylinder, and dynamic rotation mechanism possesses speed-regulating function;
The second, by tangent for the plane that is taken of cylinder and subject, the tangent line of cylinder and this plane is camera imaging face;
3rd, roll circumference outer surface sticks the paper with scale marker or pattern, starts dynamic rotation mechanism and drive drum rotating, the imaging of line scan camera aligns with drum bus; Described cylinder bus, as the plane that is taken of subject, matches with camera, light source and forms imaging angle; Check that light source normally works, camera imaging under the time for exposure of presetting and picking rate Parameter Conditions;
4th, the rotary speed of adjustment cylinder and IMAQ speeds match, obtain set imaging resolution;
5th, by the relative motion of cylinder, line scan camera gathers dynamic image, and the pattern in roll circumference is taken into continuous print visual image;
6th, regulate camera lens gradually, the image contrast of line of observation scanning camera and definition, until collecting clearly till image, then line scan camera is demarcated complete.
Further, export the speed pulse signal that described line scan camera demarcates the encoder collection of servicing unit, be used for triggering line scan camera and gather image, the rotary speed of the IMAQ speed and cylinder that realize camera matches.
Further, for multiple line scan camera, after the imaging definition adjusting camera respectively, line scan camera being demarcated servicing unit is placed within the visual field of two adjacent cameras, overlapping region can be there is during two camera imagings, observe and calculate overlapping region, the spacing between adjustment camera.
The present invention by the subject relative motion under Reality simulation camera imaging condition, realize line scan camera effectively, dynamic image acquisition intuitively; Adjustment camera lens the definition that the definition of observing image completes single camera are demarcated.In the occasion of multiple camera applications, after adjusting the imaging definition of single camera respectively, demarcate servicing unit by line scan camera, the spacing between adjacent cameras is adjusted, finally completes the calibration process of camera.
The present invention carrys out the imaging of boost line scanning camera to simulate continuous band relative motion, whether adjusts to optimum state by intuitively arriving image effect determination line scan camera.
The present invention is applicable to various low speed and the high-speed applications of line-scan digital camera application.
Accompanying drawing explanation
Fig. 1 is that line scan camera demarcates servicing unit application schematic diagram;
Fig. 2 is that schematic diagram is looked on the right side of Fig. 1;
Fig. 3 is adjacent cameras overlapping region schematic diagram.
In figure: 1 dynamic rotation mechanism, 2 cylinders, 3 supports, 4 encoders, 5 virtual bands (be taken plane), 6 light sources, 7 line scan cameras (camera).
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
A kind of dynamic imaging line scan camera scaling method, described scaling method refers to that line scan camera is by the imaging of demarcation servicing unit, completes single camera image definition and the adjustment of adjacent cameras spacing, fixing process.
A kind of dynamic imaging line scan camera scaling method, see Fig. 1, Fig. 2, the steps include:
The first, line scan camera is demarcated servicing unit and be placed on line scan camera position to be imaged.
The service position of camera when described camera position to be imaged refers to that camera normally works, matches at this position camera 7, light source 6 and subject and forms imaging angle.
Described line scan camera is demarcated servicing unit and is comprised: dynamic rotation mechanism 1, cylinder 2, support 3 and encoder 4, see Fig. 1, cylinder 2 is arranged on two side stands 3, dynamic rotation mechanism 1 drives cylinder 2 to rotate, encoder 4 is arranged in the rotating shaft that rotates together with cylinder 2, dynamic rotation mechanism 1 possesses speed-regulating function, can adjust the rotary speed of cylinder 2; The height of support 3 can adjust, to adapt to the change of calibration position.
The second, cylinder 2 is tangent with the plane 5 that is taken of subject, and cylinder 2 is place, position, camera imaging face with the tangent line of this plane 5; That is: think that cylinder 2 conveying has virtual band 5, camera 7 carries out imaging to virtual band 5, and during to simulate real work, camera is to band imaging.
3rd, cylinder 2 circumferential outer surface sticks the paper with scale marker or pattern, starts dynamic rotation mechanism 1 and drive cylinder 2 to rotate, the imaging of line scan camera 7 aligns with drum 2 bus; Described cylinder bus, as the plane 5 that is taken of subject, matches with camera 7, light source 6 and forms imaging angle, see Fig. 2; Check that light source 6 normally works, camera 7 imaging under the time for exposure of presetting and picking rate Parameter Conditions.
4th, the rotary speed of adjustment cylinder 2 and IMAQ speeds match, obtain set imaging resolution; Specifically, cylinder 2 speed pulse signal that the encoder 4 demarcating servicing unit by exporting described line scan camera gathers, be used for triggering line scan camera 7 and gather image, the rotary speed of the IMAQ speed and cylinder 2 that realize camera 7 matches.
5th, by the relative motion of cylinder 2, line scan camera 7 gathers dynamic image, and the pattern in roll circumference is taken into continuous print visual image.
6th, regulate camera 7 camera lens gradually, the image contrast of line of observation scanning camera and definition, until collecting clearly till image, then line scan camera 7 is demarcated complete.
Above-mentioned dynamic imaging line scan camera scaling method adjusts single camera image definition, is to be undertaken by under the condition that takes down at actual subject (as band).
For multiple line scan camera, after the imaging definition adjusting camera respectively, see Fig. 2, line scan camera being demarcated servicing unit is placed within the visual field of two adjacent cameras, overlapping region can be there is during two camera imagings, observe and calculate overlapping region, the spacing between adjustment camera.
Embodiment 1
As shown in Figure 1, 2, demarcation servicing unit is placed on the image space of line scan camera 7, namely cylinder 2 is tangent with the plane 5 that is taken, and tangent line overlaps with image space.The parameter such as time for exposure, picking rate of setting camera 7, and mates other image-forming conditions, as the gain of camera 7, the aperture of camera lens, the brightness etc. of light source 6.Open camera 7 IMAQ, and cylinder 2 speed of servicing unit is demarcated in adjustment, under the condition of speeds match, can obtain required imaging resolution.If install speed encoder 4 as shown in Figure 1, can arrange under line scan camera 7 is operated in external trigger pattern, under this pattern, the IMAQ speed of camera 7 controls by the rotating speed of cylinder 2, realizes speeds match.The focal length of adjustment camera 7, observe gather details and the definition of image, until obtain image clearly, complete camera definition adjustment process.
Embodiment 2
Demarcate multiple camera with the use of time visual field between overlapping region.As shown in Figure 3, observe the imaging region of adjacent camera 1 and camera 2 in Fig. 3 respectively, deduct the combined field of view of two camera imagings after being added with two cameras visual field separately, the overlapping region of camera can be obtained, adjust and fix the spacing between adjacent cameras.
Dynamic imaging line scan camera scaling method of the present invention can complete the demarcation of line scan camera efficiently and ensure stated accuracy, significant for the installation of application line scan camera equipment, test and maintenance.
These are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, therefore, all any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a dynamic imaging line scan camera scaling method, is characterized in that:
The first, line scan camera is demarcated servicing unit and be placed on line scan camera position to be imaged; The service position of camera when described camera position to be imaged refers to that camera normally works, matches at this position camera (7), light source (6) and subject and forms imaging angle; Described line scan camera is demarcated servicing unit and is comprised: dynamic rotation mechanism (1), cylinder (2), support (3) and encoder (4), cylinder (2) is arranged on two side stands (3), dynamic rotation mechanism (1) drives cylinder (2) to rotate, encoder (4) is arranged in the rotating shaft that rotates together with cylinder (2), and dynamic rotation mechanism (1) possesses speed-regulating function;
The second, cylinder (2) is tangent with the plane that is taken (5) of subject, and cylinder (2) is camera imaging face with the tangent line of this plane;
3rd, cylinder (2) circumferential outer surface sticks the paper with scale marker or pattern, starts dynamic rotation mechanism (1) and drive cylinder (2) to rotate, the imaging of line scan camera (7) aligns with drum bus; Described cylinder bus, as the plane that is taken (5) of subject, matches form imaging angle with camera (7), light source (6); Check that light source (6) normally works, camera (7) imaging under the time for exposure of presetting and picking rate Parameter Conditions;
4th, the rotary speed of adjustment cylinder (2) and IMAQ speeds match, obtain set imaging resolution; Namely cylinder (2) speed pulse signal that the encoder (4) demarcating servicing unit by exporting described line scan camera gathers, be used for triggering line scan camera (7) and gather image, the rotary speed of the IMAQ speed and cylinder (2) that realize camera (7) matches;
5th, by the relative motion of cylinder (2), line scan camera gathers dynamic image, and the pattern in roll circumference is taken into continuous print visual image;
6th, regulate camera lens gradually, the image contrast of line of observation scanning camera and definition, until collecting clearly till image, then line scan camera is demarcated complete.
2. dynamic imaging line scan camera scaling method according to claim 1, it is characterized in that: for multiple line scan camera, after the imaging definition adjusting camera respectively, line scan camera being demarcated servicing unit is placed within the visual field of two adjacent cameras, overlapping region can be there is during two camera imagings, observe and calculate overlapping region, the spacing between adjustment camera.
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| CN104660999B (en) * | 2015-03-13 | 2017-07-07 | 河南科技大学 | A kind of method and device that IMAQ is standardized to non-uniform movement object |
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| CN108195762B (en) * | 2018-03-16 | 2024-03-26 | 鞍钢集团北京研究院有限公司 | Fine adjustment device and method for detecting strip steel defects by using line scanning camera |
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| CN110986886A (en) * | 2019-12-18 | 2020-04-10 | 中国科学院长春光学精密机械与物理研究所 | Double-camera dynamic rotation scanning three-dimensional imaging simulation device |
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| CN113129381A (en) * | 2019-12-31 | 2021-07-16 | 北京精测合力科技开发有限公司 | Correction device and correction method for TFDS linear scanning camera |
| CN112558182A (en) * | 2020-10-30 | 2021-03-26 | 公安部第三研究所 | Drum-type high-speed operation testing device and method for detecting dynamic performance of vehicle bottom imaging safety inspection system |
| CN112782082B (en) * | 2020-12-30 | 2022-09-30 | 凌云光技术股份有限公司 | Calibration device and method for line scanning imaging |
| CN113703250B (en) * | 2020-12-31 | 2023-04-07 | 苏州立创致恒电子科技有限公司 | Imaging system and imaging method based on scanning galvanometer |
| CN113507544A (en) * | 2021-08-09 | 2021-10-15 | 深圳市光太科技有限公司 | Line scan camera |
| CN113822947B (en) * | 2021-10-18 | 2025-01-07 | 珠海复旦创新研究院 | A calibration method for line scanning mechanism for cylindrical visual targets |
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