CN104065957A - Camera resolving power testing device and method - Google Patents
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Abstract
The invention belongs to the field of camera performance evaluation and testing, and particularly relates to a device and a method for testing resolving power of a camera. The invention adopts a large-view-field integrating sphere to realize light source output, a plurality of groups of transmission type stripe discrimination plates are arranged at a light outlet of the integrating sphere, a tested camera is arranged on an optical stabilization platform, the shooting distance of the tested camera is adjusted, an image acquisition unit is used for acquiring an image output by the tested camera and uploading the image to a computer, and the horizontal resolution and the vertical resolution of the tested camera are judged and read by the computer, so that the accurate test of the resolution of the camera under any output mode at a certain focal distance and a certain shooting distance is realized.
Description
Technical field
The invention belongs to camera performance evaluation test field, be specifically related to a kind of video camera resolving power test device and method.
Background technology
Along with the development of China's military project, aerospace field industry, for the analysis of the observation to tasks carrying process and telemetry parameter, on each aircraft product, be equipped with respectively that missile-borne, arrow carry, airborne and spaceborne video camera.
In order to realize blur-free imaging to observed object and the accurate collection of telemetry intelligence (TELINT), must carry out the resolving power test of video camera.
The decomposing force of video camera also claims definition or resolving power, comprises horizontal resolution and vertical resolution, has described respectively horizontal direction and the resolution capability of vertical direction to target detail of video camera output image.Video camera vertical resolution refers to horizontal black and white number (TVL) within the scope of picture altitude, is subject to the impact of camera video standard and image-forming range composite factor; The horizontal resolution of video camera refers to the vertical black and white number (TVL) in the horizontal size equating with picture altitude, except being subject to, the impact of video formats and image-forming range factor, to be also subject to the impact of imaging aspect ratio.
At present the test Main Basis GB of video camera decomposing force is carried out, video camera is taken the resolution chart of specific Output system and aspect ratio, and human eye is observed output image and judged the decomposing force of video camera by high resolution monitor.
In National Standard of the People's Republic of China (GB/T15865-1995) " video camera (PAL/SECAM/NTSC) method of measurement: Part I: non-broadcast single-sensor video camera " and People's Republic of China's electron trade standard (SJ/T10203-91) " the colored veneer television eye of CCD method of measurement ", the resolving power test of video camera is all made to respective specified.Substance is: in measurement standard, regulation light source color temperature is 3100K ± 100K; Video camera is arranged to Manual focusing or automatic focus mode, makes video camera can reach optimum focusing; The control of diaphragm is set to auto iris or manual adjustments aperture, makes video camera can realize optimum exposure; Video camera is taken when resolution chart, make frame that arrow limits and monitor shown image border under underdevelopment mode just consistent.
But because standard promulgates that the time is longer, the test condition of video camera and level are all to improve, and above-mentioned standard has certain limitation in actual test.When video camera is when focusing apart from, iris setting, focal length and aperture cannot regulate, and this standard is just no longer applicable; When regulating the distance of video camera and resolution chart, can realize frame and monitor that resolution chart arrow limits shown image border under underdevelopment mode just consistent, but because measurement standard is not limited camera distance and illustrates, now discernmible black and white number can not have been served as true measurement result.And when the vision signal standard of video camera different when different with video camera output image aspect ratio, need to change resolution chart, test inconvenience.Secondly, the testing tool specifying in standard is mainly the resolution chart being plotted in cardboard material system, and under long-time use, paper wood matter can be made moist, is oxidized and turned to be yellow, the reflectivity of resolution chart can change, black and white strip contrast declines, and causes the inaccurate of test result.In addition, the method specifying in testing standard is, by human eye, discernmible narrow strips is carried out to subjective judgement, and with the objective factor of artificial subjective factor and health, test result cannot accurately quantize.
Summary of the invention
In order to solve the problem in background technology, the present invention proposes the video camera resolving power test device and method that a kind of measuring accuracy is high, can be applicable to different video standard, image-forming range and picture width.
Concrete technical scheme of the present invention is:
A kind of video camera resolving power test device, is characterized in that: comprise optical stabilization platform, image acquisition units, computer and the large visual field integrating sphere, integrating sphere light source, the transmission-type that are installed on optical stabilization platform are organized striped resolution chart more;
The light inlet of described large visual field integrating sphere arranges integrating sphere light source, and the light-emitting window of large visual field integrating sphere arranges transmission-type and organizes striped resolution chart more; The center asterism that described transmission-type is organized striped resolution chart more is concentric with the light-emitting window of large visual field integrating sphere; Tested video camera faces transmission-type and organizes striped resolution chart more, and transmission-type is organized the detector target surface center that is imaged on tested video camera of the center asterism of striped resolution chart more;
The input of described image acquisition units is connected with tested video camera, and the output of image acquisition units is connected with computer, and computer, for the data of image acquisition units transmission are processed, is determined the decomposing force of tested video camera.
Above-mentioned image acquisition units is video signal collecting card.
Above-mentioned testing apparatus also comprises the horizontally moving device that provides tested video camera horizontal direction to move on optical stabilization platform is provided; Described horizontally moving device comprises the first stepping motor, the first leading screw and the first fixed block, the output of the first stepping motor is connected with the first leading screw, the first leading screw is parallel to be fixed on optical stabilization platform, the first fixed block is sleeved on the first leading screw, and tested video camera is fixedly mounted on the first fixed block; In the time that the first stepping motor drives the first leading screw to rotate, tested video camera moves in the horizontal direction under the drive of the first fixed block.
Above-mentioned testing apparatus also comprises the vertical movement apparatus that provides tested video camera vertical direction to move on horizontally moving device is provided; Described vertical movement apparatus comprises the second stepping motor, the second leading screw and the second fixed block, the output of the second stepping motor is connected with the second leading screw, the second leading screw is vertically fixed on the first fixed block, the second fixed block is sleeved on the second leading screw, and tested video camera is fixedly mounted on the second fixed block; In the time that the second stepping motor drives the second leading screw to rotate, tested video camera moves in vertical direction under the drive of the second fixed block.
Above-mentioned testing apparatus also comprises respectively at the first stepping motor and being connected with the second stepping motor, controls the moving component driving control unit of the first stepping motor and the second stepping electric machine rotation.
According to above-mentioned testing apparatus, the method for testing of this device is now proposed, it is characterized in that, comprise the following steps:
1) adjust tested video camera and transmission-type and organize the distance between striped resolution chart more, make it reach theoretical optimal imaging apart from s, under computer recording, theoretical optimal imaging is apart from s;
2) regulate the output energy of integrating sphere light source to make transmission-type organize striped resolution chart more present light and shade striped picture clearly, and take by tested video camera;
3) image acquisition units gathers the light and shade striped picture of tested video camera shooting and transmits it to computer;
4) transmission-type that reads computer stored is organized each group width of fringe on striped resolution chart more and carries out the array of data of Accurate Calibration, automatically inquires about video camera horizontal direction and discernmible width of fringe l corresponding to narrow strips group of vertical direction by the mode of look-up table
1and l
2;
5) by step 1) the tested video camera and the transmission-type that obtain organize distance s and the step 4 between striped resolution chart more) the video camera horizontal direction and discernmible width of fringe l corresponding to narrow strips group of vertical direction that obtain
1and l
2; Computer passes through respectively formula
calculate tested video camera horizontal resolution and vertical resolution;
In formula: focal length that f is tested video camera, in the time of calculated level decomposing force: D is the horizontal direction effective dimensions of tested video camera detector target surface used, in the time calculating vertical resolution: D is the vertical direction effective dimensions of tested video camera detector target surface used.
Above-mentioned steps 6) in horizontal resolution can be subject to the restriction of tested video camera output image aspect ratio, calculate corresponding horizontal resolution tv line P by Computer, concrete computing formula is
In formula: the M described step 5 of serving as reasons) in number of scanning lines corresponding to the horizontal direction that calculates,
for picture altitude and the ratio of width, H representative image height, W representative image width.
The invention has the advantages that:
1, the present invention has avoided the restriction of regulation to focusing in testing standard, and making to focus becomes feasible apart from the test of video camera decomposing force;
2, the present invention, by regulating integrating sphere energy of light source can realize the change of tested video camera light-inletting quantity, has avoided exchanging in testing standard the restriction of aperture, makes the test of iris setting video camera decomposing force become feasible;
3, the present invention be not subject to the resolution chart border that specifies in traditional test standard must with the just consistent restriction of image field of view edge, make, in the situation that cannot focusing, can complete the test of video camera decomposing force;
4, the present invention is not subject to the restriction of video camera outputting video signal standard, complete the collection to video camera outputting video signal by computer, no matter analog system (PAL/SECAM/NTSC) or video format, the present invention all can complete the accurate test of decomposing force;
5, the present invention has introduced video camera has been decomposed to factor---the camera distance that has crucial impact, makes test result accurate, credible;
6, the present invention uses large visual field integrating sphere to export as light source, and its light-emitting window surface uniformity is 98%, has avoided the radiative inhomogeneities of diffuse reflection resolution chart in traditional test;
8, the present invention adopts transmission-type resolution chart as photographic subjects, and its striped line width can not change, and black and white strip contrast can not change with long-time use;
9, the present invention is entered and the motion of lift adjustment mechanism by computer control long guideway, and displacement is accurate, has avoided personnel to operate the inaccurate factor of bringing;
10, the present invention, by computer acquisition video camera output image, completes by image algorithm the striped that video camera is taken and carries out interpretation and calculating, has avoided the subjective factor that in traditional test, human eye brings by monitor interpretation, and measuring accuracy is high, reproducible.
Brief description of the drawings
Fig. 1 is structure diagram of the present invention.
The large visual field of 1-integrating sphere, 2-integrating sphere light source, 3-transmission-type are organized striped resolution chart, 4-horizontally moving device, 5-vertical movement apparatus, 6-moving component driving control unit, 7-optical stabilization platform, 8-image acquisition units, 9-computer, the tested video camera of 10-more.
Embodiment
The present invention is in order to realize the accurate test to resolution of video camera, adopt large visual field integrating sphere to realize light source output, place transmission-type at integrating sphere light-emitting window place and organize striped resolution chart more, video camera is fixed on long guideway, regulate camera distance by long guideway, with computer, video camera output image is gathered and interpretation goes out that video camera can differentiate narrow strips width, realization under a certain focal length, the necessarily accurate test of video camera decomposing force under any Output system in camera distance place.
Below in conjunction with accompanying drawing 1, device of the present invention is described in detail:
A kind of video camera resolving power test device, comprises optical stabilization platform 7, image acquisition units 8, computer 9 and the large visual field integrating sphere 1, integrating sphere light source 2, the transmission-type that are arranged on optical stabilization platform 7 are organized striped resolution chart 3 more;
The concrete annexation of this device is: the light inlet of large visual field integrating sphere 1 arranges integrating sphere light source 2 (note: integrating sphere light source color temperature is 3000K ± 100K); The light-emitting window of large visual field integrating sphere 1 arranges transmission-type and organizes striped resolution chart 3 more; The center asterism that transmission-type is organized striped resolution chart 3 more is concentric with the light-emitting window of large visual field integrating sphere 1; Tested video camera 10 faces transmission-type and organizes striped resolution chart 3 more, and transmission-type is organized the detector target surface center that is imaged on tested video camera 10 of the center asterism of striped resolution chart 3 more;
Image acquisition units 5 is video signal collecting card, can realize the collection to vision signals such as composite analog video signal, SDI and HD, and its input is connected with tested video camera, and its output is connected with computer.The image that image acquisition units 5 is taken for gathering tested video camera 10, computer 9 carries out computing for the data that image acquisition units 5 is transmitted, and finally determines the decomposing force of tested video camera 10.
While calculating the decomposing force of tested video camera 10 due to computer 9, need to provide tested video camera 10 and transmission-type to organize the distance between striped resolution chart 3 more, and artificial alignment error is larger, therefore device of the present invention also comprises the horizontally moving device 4 that provides tested video camera 10 horizontal directions to move on optical stabilization platform 7 is provided; Horizontally moving device 4 comprises the first stepping motor, the first leading screw and the first fixed block, the output of the first stepping motor is connected with the first leading screw, the first leading screw is parallel to be fixed on optical stabilization platform, the first fixed block is sleeved on the first leading screw, and tested video camera is fixedly mounted on the first fixed block; In the time that the first stepping motor drives the first leading screw to rotate, tested video camera moves in the horizontal direction under the drive of the first fixed block.
In order further to guarantee that transmission-type organizes the detector target surface center that is imaged on tested video camera 10 of the center asterism of striped resolution chart 3 more, the vertical movement apparatus 5 that provides tested video camera vertical direction to move on horizontally moving device 4 is provided this testing apparatus; Vertical movement apparatus 5 comprises the second stepping motor, the second leading screw and the second fixed block, the output of the second stepping motor is connected with the second leading screw, the second leading screw is vertically fixed on the first fixed block, the second fixed block is sleeved on the second leading screw, and tested video camera is fixedly mounted on the second fixed block; In the time that the second stepping motor drives the second leading screw to rotate, tested video camera moves in vertical direction under the drive of the second fixed block.
Certainly, the horizontal direction of the tested video camera of above-mentioned automatic control moves with vertical direction and moves, on this device, be also provided with respectively at the first stepping motor and be connected with the second stepping motor, control the moving component driving control unit 6 of the first stepping motor and the second stepping electric machine rotation.
By the above-mentioned introduction to testing apparatus, which kind of method this testing apparatus adopts test accurately tested video camera, also needs to describe in detail, and the step that the method is concrete is:
Step 1) adjust tested video camera and transmission-type is organized the distance between striped resolution chart more, make it reach theoretical optimal imaging apart from s, under computer recording, theoretical optimal imaging is apart from s;
Step 2) regulate the output energy of integrating sphere light source to make transmission-type organize striped resolution chart to present light and shade striped picture clearly more, and take by tested video camera;
Step 3) image acquisition units gathers the light and shade striped picture that tested video camera takes and transmits it to computer;
Step 4) transmission-type that reads computer stored organizes each group width of fringe on striped resolution chart more and carries out the array of data of Accurate Calibration, automatically inquires about video camera horizontal direction and discernmible width of fringe l corresponding to narrow strips group of vertical direction by the mode of look-up table
1and l
2;
Step 5) by step 1) the tested video camera and the transmission-type that obtain organize distance s and the step 4 between striped resolution chart more) the video camera horizontal direction and discernmible width of fringe l corresponding to narrow strips group of vertical direction that obtain
1and l
2; Computer passes through respectively formula
calculate tested video camera horizontal resolution and vertical resolution;
In formula: focal length that f is tested video camera, in the time of calculated level decomposing force: D is the horizontal direction effective dimensions of tested video camera detector target surface used, in the time calculating vertical resolution: D is the vertical direction effective dimensions of tested video camera detector target surface used.
In addition, the professional definition of video camera horizontal resolution refer to the horizontal direction of image equal altitudes on the striped that can differentiate, therefore, in the time of target constant, and the picture width difference of video camera output image, the target width that image can present is different.For example, we are in the time removing to see a film that is originally 4:3 form with the display format of 16:9, and personage and scenery can broaden.The horizontal resolution of tested video camera can be subject to the restriction of width the ratio of width to height, therefore, need to calculate corresponding horizontal resolution tv line P by Computer, and concrete computing formula is:
wherein M is for by step 5) the tested video camera horizontal resolution that calculates,
for picture altitude and the ratio of width, H representative image height, W representative image width.
Claims (7)
1. a video camera resolving power test device, is characterized in that: comprise optical stabilization platform, image acquisition units, computer and the large visual field integrating sphere, integrating sphere light source, the transmission-type that are installed on optical stabilization platform are organized striped resolution chart more;
The light inlet of described large visual field integrating sphere arranges integrating sphere light source, and the light-emitting window of large visual field integrating sphere arranges transmission-type and organizes striped resolution chart more; The center asterism that described transmission-type is organized striped resolution chart more is concentric with the light-emitting window of large visual field integrating sphere; Tested video camera faces transmission-type and organizes striped resolution chart more, and transmission-type is organized the detector target surface center that is imaged on tested video camera of the center asterism of striped resolution chart more;
The input of described image acquisition units is connected with tested video camera, and the output of image acquisition units is connected with computer, and computer, for the data of image acquisition units transmission are processed, is determined the decomposing force of tested video camera.
2. camera resolving power test device according to claim 1, is characterized in that: described image acquisition units is video signal collecting card.
3. camera resolving power test device according to claim 2, is characterized in that: testing apparatus also comprises the horizontally moving device that provides tested video camera horizontal direction to move on optical stabilization platform is provided; Described horizontally moving device comprises the first stepping motor, the first leading screw and the first fixed block, the output of the first stepping motor is connected with the first leading screw, the first leading screw is parallel to be fixed on optical stabilization platform, the first fixed block is sleeved on the first leading screw, and tested video camera is fixedly mounted on the first fixed block; In the time that the first stepping motor drives the first leading screw to rotate, tested video camera moves in the horizontal direction under the drive of the first fixed block.
4. camera resolving power test device according to claim 3, is characterized in that: testing apparatus also comprises the vertical movement apparatus that provides tested video camera vertical direction to move on horizontally moving device is provided; Described vertical movement apparatus comprises the second stepping motor, the second leading screw and the second fixed block, the output of the second stepping motor is connected with the second leading screw, the second leading screw is vertically fixed on the first fixed block, the second fixed block is sleeved on the second leading screw, and tested video camera is fixedly mounted on the second fixed block; In the time that the second stepping motor drives the second leading screw to rotate, tested video camera moves in vertical direction under the drive of the second fixed block.
5. camera resolving power test device according to claim 4, it is characterized in that: testing apparatus also comprises respectively at the first stepping motor and being connected with the second stepping motor, controls the moving component driving control unit of the first stepping motor and the second stepping electric machine rotation.
6. a method of testing for the testing apparatus of claim 1, is characterized in that, comprises the following steps:
1) adjust tested video camera and transmission-type and organize the distance between striped resolution chart more, make it reach theoretical optimal imaging apart from s, under computer recording, theoretical optimal imaging is apart from s;
2) regulate the output energy of integrating sphere light source to make transmission-type organize striped resolution chart more present light and shade striped picture clearly, and take by tested video camera;
3) image acquisition units gathers the light and shade striped picture of tested video camera shooting and transmits it to computer;
4) transmission-type that reads computer stored is organized each group width of fringe on striped resolution chart more and carries out the array of data of Accurate Calibration, automatically inquires about video camera horizontal direction and discernmible width of fringe l corresponding to narrow strips group of vertical direction by the mode of look-up table
1and l
2;
5) by step 1) the tested video camera and the transmission-type that obtain organize distance s and the step 4 between striped resolution chart more) the video camera horizontal direction and discernmible width of fringe corresponding to narrow strips group of vertical direction that obtain
l1 and l
2; Computer passes through respectively formula
calculate tested video camera horizontal resolution and vertical resolution;
In formula: focal length that f is tested video camera, in the time of calculated level decomposing force: D is the horizontal direction effective dimensions of tested video camera detector target surface used, in the time calculating vertical resolution: D is the vertical direction effective dimensions of tested video camera detector target surface used.
7. the method for testing of testing apparatus according to claim 6, is characterized in that: described horizontal resolution can be subject to tested video camera output image aspect ratio restriction, calculates corresponding horizontal resolution tv line P by Computer, and concrete computing formula is:
In formula: the M described step 5 of serving as reasons) in number of scanning lines corresponding to the horizontal direction that calculates,
for picture altitude and the ratio of width, H representative image height, W representative image width.
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| CN105763871A (en) * | 2014-12-18 | 2016-07-13 | 深圳市同为数码科技股份有限公司 | Real time detection system and detection method for camera definition |
| CN105991996A (en) * | 2015-02-15 | 2016-10-05 | 宁波舜宇光电信息有限公司 | Detection system and detection method for camera module group |
| CN106303511A (en) * | 2016-08-17 | 2017-01-04 | 芜湖凯尔电气科技有限公司 | Home cinema instrument imaging detection device |
| CN107749982A (en) * | 2017-11-29 | 2018-03-02 | 北京小米移动软件有限公司 | For testing device, method and the controller of camera auto-focusing |
| CN108419075A (en) * | 2018-05-18 | 2018-08-17 | 南京天方电子工程有限公司 | A kind of detection method of camera lens resolution ratio |
| CN108827599A (en) * | 2018-05-21 | 2018-11-16 | 余姚舜宇智能光学技术有限公司 | A kind of wide-angle mould group full filed resolving power test equipment and method |
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| CN106303511A (en) * | 2016-08-17 | 2017-01-04 | 芜湖凯尔电气科技有限公司 | Home cinema instrument imaging detection device |
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| CN108419075A (en) * | 2018-05-18 | 2018-08-17 | 南京天方电子工程有限公司 | A kind of detection method of camera lens resolution ratio |
| CN108827599A (en) * | 2018-05-21 | 2018-11-16 | 余姚舜宇智能光学技术有限公司 | A kind of wide-angle mould group full filed resolving power test equipment and method |
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