CN101355711A - Apparatus and method for measuring resolution of CCD camera base on triangle direction discrimination - Google Patents
Apparatus and method for measuring resolution of CCD camera base on triangle direction discrimination Download PDFInfo
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- CN101355711A CN101355711A CNA2008102222114A CN200810222211A CN101355711A CN 101355711 A CN101355711 A CN 101355711A CN A2008102222114 A CNA2008102222114 A CN A2008102222114A CN 200810222211 A CN200810222211 A CN 200810222211A CN 101355711 A CN101355711 A CN 101355711A
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Abstract
The present invention relates to a CCD camera resolution measurement device based on triangle direction identification and a method thereof, belonging to the photoelectric test field. The device comprises a CCD camera to be measured, a resolution target, an even illumination lamp house and a high resolution monitor. The revolution target adopts an equilateral triangle pattern to substitute an ordinary grid pattern. In the test process, the identification of the orientation of the equilateral triangle substitutes the conventional fringe resolution so that the Morie fringe influence in the conventional grid pattern resolution test can be effectively avoided. The television line number corresponding to the correct decision probability higher than 75 percent is determined to be the limiting resolution of the camera. In order to improve the measuring accuracy, a value interpolation calculation is adopted for the standard grid interval so scheme out a novel television resolution target. The measurement accuracy can be largely improved by cooperating two targets. The method and the device can be applied to the performance evaluation of various visible light CCD cameras.
Description
Technical field
The invention belongs to the discrete light electric imaging system performance evaluating branch in the photoelectricity test field, the Morie fringe striped influence in the conventional resolution test can effectively be eliminated by this system, realizes the accurate measurement to ccd video camera resolution.Can be applicable to performance evaluating to all kinds of visible light ccd video cameras.
Background technology
Resolution is the most important performance index of television camera, has characterized the ability of television system transmission details, directly affects the subjective definition of image.According to the regulation of GB12338-90 " the universal television eye method of measurement of black and white ", resolution is defined as: to the image of the wide chequered with black and white lines of a frame, differentiate the ability of its black and white lines minimum widith.Max line numerical table in the every vertical frame dimension degree that identifies on the resolution chart commonly used shows, promptly uses tv line (TVL) to represent.The determined target plate of the general GB6996.1 of employing " transmission-type TV integration test figure " visual means interpretation ccd video camera resolution.This standard is provided with 10 striped group zones of corresponding 200 to 800 tv lines, has provided each striped group position and width of fringe; The rectangle target plate is of a size of 100 * 133mm
2Be provided with the striped group of corresponding each tv line in the middle, the corresponding relation of width of fringe and tv line is as follows:
| Tv line (resolution line) | Grizzly bar live width (mm) |
| 200 | 0.5±0.02 |
| 250 | 0.40±0.02 |
| 300 | 0.33±0.02 |
| 350 | 0.29±0.01 |
| 400 | 0.25±0.01 |
| 450 | 0.22±0.01 |
| 500 | 0.200±0.009 |
| 550 | 0.180±0.009 |
| 600 | 0.170±0.008 |
| 650 | 0.154±0.007 |
| 700 | 0.143±0.006 |
| 750 | 0.133±0.005 |
| 800 | 0.125±0.004 |
Because the resolution target plate is designed to the grizzly bar pattern, its imaging meeting on discrete sampling image devices such as CCD produces the grating effect, and the Morie fringe of formation is understood the disturbace resolution interpretation, and then has influence on the resolution measurement result of ccd video camera.Therefore, objectively exist a kind of like this demand, i.e. design can be eliminated the special resolution test target plate of mole effect, to improve the resolution measurement precision of ccd video camera.
In infrared imaging system, the resolution capability that generally adopts minimum resolvable temperature difference (MRTD) to come characterization system.Tradition MRTD test adopts the temperature difference pattern of equally spaced four bar targets (depth-width ratio of every bar is 7: 1) formation as tested object.When the MRTD of the discrete infrared imaging system of test, the output image of observation cycle rectangle batten can show significantly owes sampling noiset, thereby has influence on the MRTD accuracy of test.
By discerning the correlative study discovery of simple space test pattern to influencing human eye, the focal plane imaging of cycle rectangle batten shows as obviously owes the spectrum confusion of sampling, and aperiodic, leg-of-mutton imaging observation was not influenced by the spectrum confusion of sampling owed of focal plane array, more can reflect the observation characteristic of real goal.Based on this, the people such as P.Bijl of Holland have proposed a kind of new method that can fully characterize infrared imaging system performance: delta direction is distinguished threshold method (Triangle Orientation Discrimination threshold), is called for short the TOD method.The method utilizes the equilateral triangle temperature difference target plate of different size, different contrast as test target, judge triangular orientation by the observer by infrared imaging system, obtain and the 75% correct relation curve of judging between probability corresponding threshold contrast and the triangle size.The TOD method has effectively been avoided the effect of sampling of owing in the infrared thermal imagery system testing, can be advantageously applied to the prediction that realistic objective obtains performance.The TOD method has received the very big concern in infrared imaging field since being suggested, be considered to a kind of new method that is applicable to following new infrared imaging system performance characterization.
In view of the TOD method has in infrared imaging system than successful Application, the present invention is applied to the triangle direction rule in the Performance Detection of visible light CCD imaging system.
Summary of the invention
The objective of the invention is to design a kind of special resolution test target that can eliminate mole effect, to improve the resolution measurement precision of ccd video camera in order to overcome the defective of existing ccd video camera resolution test target plate.For this reason, the present invention uses for reference the TOD method in the infrared thermal imagery system testing, design a kind of novel C CD resolution of video camera test target plate, and be the novel resolution test of fundamental construction one cover system, improve its method of testing with this target plate based on triangle direction identification.
After traditional grizzly bar pattern is replaced by the equilateral triangle pattern, the resolution test of ccd video camera will from differentiate the striped group be converted to differentiate leg-of-mutton towards.Because ccd video camera resolution adopts tv line as measurement result, reach the equivalence of two kinds of method of measurement, just must carefully design the size and the shape of triangle pattern, so that when the equilateral triangle of a certain size just can differentiate its towards the time, the grizzly bar pattern corresponding with this size also just can be differentiated.
Periodicity grizzly bar pattern in the conventionally test target has formed square-wave signal, the corresponding different object space frequency of grizzly bar pattern that thickness is different.Obviously grizzly bar is thick more, and corresponding object space frequency is low more.In the design of triangle target plate,, be equivalent then based on the resolution test method of identification triangular orientation with based on the resolution test method of differentiating striped if the space periodic of the length of side of equilateral triangle and array grizzly bar pattern is equal.From object space, this design is obvious: the space periodic of supposing the grizzly bar pattern of corresponding video camera limiting resolution is d, then the discernmible minimum space yardstick of ccd video camera also is d on this position, if give an equilateral triangle with this space scale, then this video camera should can differentiate equally leg-of-mutton towards.
The objective of the invention is to be achieved through the following technical solutions:
A kind of ccd video camera resolution measurement device of the present invention based on triangle direction identification, comprise the resolution target plate of ccd video camera to be measured, 200～800TVL, the resolution target plate of 225～775TVL, even lighting lamphouse and high-resolution display monitor central monitoring system, wherein lighting lamphouse is arranged in the rear of triangle resolution test target plate, and target plate is evenly illuminated; The input of full resolution pricture display monitor central monitoring system is connected with ccd video camera to be measured, in order to the imaging of target target plate, differentiates for eye-observation.
Described resolution target plate adopts the equilateral triangle pattern to replace common grizzly bar pattern; Differentiating in test process with the identification equilateral triangle towards the striped that replaces routine; Because ccd video camera is the discrete sampling image device, its fill factor, curve factor can not reach for 1 (having a determining deviation between the pixel), can bring certain influence towards judgement by diabolo, according to the test experience, will reach the limiting resolution that the pairing tv line number of 75% above correct decision probability is defined as this video camera.
The structure and the size design of described triangle resolution target plate are as follows:
1) the equilateral triangle size design of 200～800TVL resolution target plate: the grizzly bar live width with GB6996.1 " transmission-type TV integration test figure " regulation is a benchmark, the length of side of design equilateral triangle pattern, make its space periodic with corresponding grizzly bar pattern identical, the resolution reading of its representative is also identical;
2) equilateral triangle of 200～800TVL resolution target plate is towards design: each organize triangle pattern towards being designed to upper and lower, left and right four direction random alignment, to avoid the subjectivity influence in the visual measuring process;
3) the peripheral design of 200～800TVL resolution target plate: except that the resolution pattern, other test patterns are consistent with " transmission-type TV integration test figure ", to realize maximum versatility;
4) because the resolution test target of GB6996.1 regulation is spaced apart 50TVL, for dwindling tv line at interval, available above-mentioned 1～3 step is 225～775TVL of design in addition, be spaced apart the triangle resolution test target plate of 50TVL, its size can obtain from the grizzly bar live width interpolation of GB6996.1 regulation, and the cooperation by two target plates makes its resolution be reduced to 25TVL at interval.
The triangle target plate that design is finished as shown in Figure 1 and Figure 2.
The measuring process of a kind of ccd video camera resolution measurement method based on triangle direction identification of the present invention is as follows:
1) uses ccd video camera to be measured, the resolution chart in picked-up 200～800TVL resolution target plate;
2) camera lens of assurance ccd video camera to be measured is vertical with target surface in the measuring process, and test target pattern is full of whole pictures of monitor;
3) regulate the ccd video camera camera lens, the pattern that display monitor central monitoring system is shown reach the most clear till;
4) visualization display monitor central monitoring system, judge corresponding different tv lines respectively organize equilateral triangle towards, will reach the resolution that the pairing tv line number of 75% above correct decision probability is defined as ccd video camera to be measured.
5) use 225～775TVL resolution test target plate instead, repeat above step, obtain more accurate resolution measurement result.
Beneficial effect
Be that periodicity grizzly bar pattern is replaced by size and towards different equilateral triangle patterns with this triangle target plate novel C CD resolution of video camera test macro that is fundamental construction and the fundamental difference of conventional resolution test system.The benefit that the change test pattern brings shows two aspects: at first, because the aperiodicity of triangle pattern replaces grizzly bar pattern, the influence that can stop Morie fringe with triangle pattern, thereby eliminate the worst error source in the resolution measurement process, improve certainty of measurement.In addition, triangle pattern towards can simple designs being the upper and lower, left and right four direction, this will simplify the test process of resolution.
Description of drawings
Fig. 1 is 200～800 resolution test target plate for the corresponding tv line number of the present invention;
Fig. 2 is 225～775 resolution test target plate for the corresponding tv line number of the present invention;
Fig. 3 is a ccd video camera resolution test installation drawing of the present invention;
Among the figure, 1-triangle resolution test target plate, the even lighting lamphouse of 2-, 3-high-resolution display monitor central monitoring system, 4-ccd video camera to be measured.
Embodiment
Below be example with design D240 size target plate, in conjunction with the accompanying drawings the specific embodiment of the present invention is illustrated.
The inventive system comprises the resolution target plate of ccd video camera to be measured, 200～800TVL, the resolution target plate of 225～775TVL, even lighting lamphouse and high-resolution display monitor central monitoring system, wherein lighting lamphouse is arranged in the rear of triangle resolution test target plate, and target plate is evenly illuminated; The input of full resolution pricture display monitor central monitoring system is connected with ccd video camera to be measured, in order to the imaging of target target plate, differentiates for eye-observation.
One, triangle resolution target plate design
The base plate size of choosing transmission-type resolution target plate is the D240 standard among the GB6996.1 " transmission-type TV integration test figure ", i.e. (180 * 240mm
2) specification.It is consistent with corresponding grizzly bar target space periodic to get the equilateral triangle length of side, and the size that obtains the triangle resolution pattern corresponding with GB6996.1 is as follows:
| Tv line number (TVLines) | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 550 | 600 | 650 | 700 | 750 | 800 |
| The triangle length of side (mm) | 1.800 | 1.440 | 1.188 | 1.044 | 0.900 | 0.992 | 0.720 | 0.648 | 0.612 | 0.554 | 0.514 | 0.478 | 0.450 |
According to the triangle length of side drawing resolution pattern of different tv line correspondences in the last table, the triangle in every picture group case is towards (upper and lower, left and right) random alignment.For guaranteeing the versatility of test target plate, other patterns and GB6996.1 except that the resolution pattern are consistent, and its structure as shown in Figure 1.
The resolution of above-mentioned target plate is spaced apart 50 tv lines, for improving measuring accuracy, above-mentioned data is fitted as curve, makes interpolative operation then.Curve fit obtains the relational expression that triangle length of side d and corresponding tv line are counted N:
Can calculate the resolution triangle length of side of the corresponding D240 size of any tv line target plate from this relational expression.
The size that calculates one group of new triangle resolution pattern is as follows:
| Tv line number (TVLines) | 225 | 275 | 325 | 375 | 425 | 475 | 525 | 575 | 625 | 675 | 725 | 775 |
| The triangle length of side (mm) | 1.600 | 1.309 | 1.108 | 0.960 | 0.847 | 0.758 | 0.686 | 0.626 | 0.576 | 0.533 | 0.497 | 0.465 |
According to the triangle length of side drawing resolution pattern of different tv line correspondences in the last table, the triangle in every picture group case is towards (upper and lower, left and right) random alignment, and its structure as shown in Figure 2.
Fig. 1 and two kinds of triangle resolution of Fig. 2 target plate are used, minimum resolution can be reduced to 25 tv lines at interval, thereby improve measuring accuracy.
Two, the ccd video camera resolution test method of discerning based on triangle direction
Testing procedure is as follows:
1. (corresponding 200～800TVL) are positioned over even lighting lamphouse exit to select test target plate shown in Figure 1 for use.
2. four telltale marks in upper and lower, left and right with the target plate edge are benchmark, move and the adjusting video camera, make target plate be full of camera views, and guarantee that camera lens optical axis is vertical with target surface.
3. adjusting camera lens is till the imaging on the monitor is the most clear
4. visualization monitor, discern each component distinguish in the pattern triangle towards, with the resolution value that is not less than the 75% correct pattern groups correspondence of judging probability limiting resolution as this video camera.
5. (correspondence 225～775TVL) repeats above step, obtains more accurate resolution measurement result to use test target plate shown in Figure 2 instead.
Claims (3)
1. ccd video camera resolution measurement device based on triangle direction identification, comprise the resolution target plate of ccd video camera to be measured, 200～800TVL, the resolution target plate of 225～775TVL, even lighting lamphouse and high-resolution display monitor central monitoring system, wherein lighting lamphouse is arranged in the rear of triangle resolution test target plate, and target plate is evenly illuminated; The input of full resolution pricture display monitor central monitoring system is connected with ccd video camera to be measured, in order to the imaging of target target plate, differentiates for eye-observation, it is characterized in that: the resolution target plate adopts the equilateral triangle pattern to replace common grizzly bar pattern; Differentiating in test process with the identification equilateral triangle towards the striped that replaces routine; To reach the limiting resolution that the pairing tv line number of 75% above correct decision probability is defined as this video camera.
2. a kind of ccd video camera resolution measurement device based on triangle direction identification as claimed in claim 1 is characterized in that the structure and the size design of triangle resolution target plate is as follows:
1) the equilateral triangle size design of 200～800TVL resolution target plate: the grizzly bar live width with GB6996.1 " transmission-type TV integration test figure " regulation is a benchmark, the length of side of design equilateral triangle pattern, make its space periodic with corresponding grizzly bar pattern identical, the resolution reading of its representative is also identical;
2) equilateral triangle of 200～800TVL resolution target plate is towards design: each organize triangle pattern towards being designed to upper and lower, left and right four direction random alignment, to avoid the subjectivity influence in the visual measuring process;
3) the peripheral design of 200～800TVL resolution target plate: except that the resolution pattern, other test patterns are consistent with " transmission-type TV integration test figure ", to realize maximum versatility;
4) because the resolution test target of GB6996.1 regulation is spaced apart 50TVL, for dwindling tv line at interval, available above-mentioned 1～3 step is 225～775TVL of design in addition, be spaced apart the triangle resolution test target plate of 50TVL, its size can obtain from the grizzly bar live width interpolation of GB6996.1 regulation, and the cooperation by two target plates makes its resolution be reduced to 25TVL at interval.
3. ccd video camera resolution measurement method based on triangle direction identification is characterized in that measuring process is as follows:
1) uses ccd video camera to be measured, the resolution chart in picked-up 200～800TVL resolution target plate;
2) camera lens of assurance ccd video camera to be measured is vertical with target surface in the measuring process, and test target pattern is full of whole pictures of monitor;
3) regulate the ccd video camera camera lens, the pattern that display monitor central monitoring system is shown reach the most clear till;
4) visualization display monitor central monitoring system, judge corresponding different tv lines respectively organize equilateral triangle towards, will reach the resolution that the pairing tv line number of 75% above correct decision probability is defined as ccd video camera to be measured.
5) use 225～775TVL resolution test target plate instead, repeat above step, obtain more accurate resolution measurement result.
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| CN105959683A (en) * | 2016-05-16 | 2016-09-21 | 武汉虹识技术有限公司 | Camera lens resolution detection method and device |
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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 |
| CN105959683A (en) * | 2016-05-16 | 2016-09-21 | 武汉虹识技术有限公司 | Camera lens resolution detection method and device |
| CN105959683B (en) * | 2016-05-16 | 2018-09-11 | 武汉虹识技术有限公司 | A kind of camera lens resolution detection method and device |
| CN108200424A (en) * | 2017-11-17 | 2018-06-22 | 天津津航技术物理研究所 | A kind of adjustment method and system for multiple TDICCD detectors optical axis centerings |
| CN108134895A (en) * | 2017-12-26 | 2018-06-08 | 深圳市保千里电子有限公司 | A kind of wide-angle lens module adjusting apparatus and method of adjustment |
| CN108134895B (en) * | 2017-12-26 | 2020-09-04 | 深圳市保千里电子有限公司 | Wide-angle lens module adjusting device and adjusting method |
| CN111473956A (en) * | 2019-01-24 | 2020-07-31 | 深圳市共进电子股份有限公司 | Device and method for testing resolution of wide-angle lens |
| CN111473956B (en) * | 2019-01-24 | 2022-04-15 | 深圳市共进电子股份有限公司 | Device and method for testing resolution of wide-angle lens |
| CN113781414A (en) * | 2021-08-27 | 2021-12-10 | 歌尔光学科技有限公司 | Lens resolving power testing method and device and electronic equipment |
| CN114754876A (en) * | 2022-03-17 | 2022-07-15 | 公安部第一研究所 | Infrared imaging system performance evaluation equipment and method based on TOD |
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