CN108844626A - Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device and method - Google Patents
Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device and method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
Abstract
The invention proposes a kind of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device and methods.The light cone angle for entering integrating sphere by controlling light source realizes the automatic continuous adjustable of light-source system output intensity, and overcoming cannot accurate continuously adjustable disadvantage by adjusting voltage and optical device method bring objective optics contrast variation range.Using discrete colimated light system, off axis paraboloidal mirror is matched according to tested camera focus size, overcomes integrated collimation lens non-exchange, the disadvantage of matching difference.By the way that system under test (SUT) is placed among collimating optical system, simulate infinity low contrast target, uniaxial rotation or precision vibration are generated in conjunction with dynamic analog platform, simulates various motion states, realizes that Display Aim Taking on TV Set System carries out the measurement of dynamic Minimum resolvable contrast in laboratory.When dynamic analog platform is motionless, the present invention has both static MRC measurement function, and dynamic MR C and static state MRC measurement result is facilitated to compare, the degree that quantitative analysis declines due to the image quality that movement introduces.
Description
Technical field
The present invention relates to optical metrology and measurement field, specially a kind of minimum distinguishable comparison of Display Aim Taking on TV Set System dynamic
Spend test device and method.
Background technique
Display Aim Taking on TV Set System is mainly used for the functions such as search, detection, identification and aiming to target.The superiority and inferiority of its performance is
The key point for determining photo electric imaging system operating distance and attack precision, therefore, it is necessary to the imaging of Display Aim Taking on TV Set System
It can be carried out accurately measurement and assessment.
Minimum resolvable contrast (MRC-Minimum Resolvable Contrast) can quantitatively provide Display Aim Taking on TV Set
The discernmible liminal contrast of system, it combines system sensitivity and noise, object space frequency and human eye vision are special
The factors such as property, can comprehensively reflect the limiting performance of photo electric imaging system.Therefore, MRC is evaluation imaging system images performance
One important indicator.
For the measurement of MRC, Chinese patent ZL 201410353411.9 disclose it is a kind of for near-infrared video camera most
Small distinguishable contrast test macro.The test macro, as target light source, passes through constant-current source and diaphragm reality using simple integral ball
The adjusting of existing target contrast.The shortcoming of the device is that background luminance is not controlled, it is difficult to mesh in the practical practical situation of simulation
The actual conditions that mark and background can be changed, and test macro system suitability range is smaller, is not able to satisfy Display Aim Taking on TV Set System, micro-
The testing requirement of the devices such as light camera.
In metering journal the 1st phase of volume 27 in 2006, in P32-35, Li Wenjuan et al. is had developed using overlap integral ball
Portable target source with adjustable contrast ratio target generator device.The device is mainly by background integrating sphere, target integrating sphere and light splitting
System composition provides illumination to each integrating sphere by way of light splitting using a light source.The device using it is external can modulation
Device is hindered, by changing voltage value, allows the light-source brightness of integrating sphere in 0.3~200cd/m2Variation in range.The device
Shortcoming is mainly reflected in：
(1) due to realizing objective optics contrast using the method for adjusting light source voltage and optical device (such as attenuator)
Adjustable, so the colour temperature stability of target source lacks effective guarantee, and the variation range of objective optics contrast cannot essence
It is close continuously adjustable.
(2) since collimation lens is integrated on background integrating sphere, only when tested camera and collimation lens focal length meet
When suitable magnifying power matching relationship, scale test image appropriate can be just received on a monitor, if tested phase
Machine focal length is unsatisfactory for condition, then the test device must just redesign processing, time-consuming and laborious.
(3) measurement method of MRC of the device in the case where design process only considered static conditions.In practical applications, mesh
Mark is kept in motion mostly, and Display Aim Taking on TV Set System occupies an leading position to the measurement of dynamic object, test system reported above
System cannot reflect Display Aim Taking on TV Set System to the power of test of dynamic object.
In order to solve problem above, and with the continuous improvement of the tracking of Display Aim Taking on TV Set System and pointing accuracy, compel to be essential
A kind of new Display Aim Taking on TV Set System dynamic Minimum resolvable contrast measuring device and method are developed, Display Aim Taking on TV Set System is improved
The accuracy of evaluation of imaging quality under practical situations.
Summary of the invention
In order to solve the problems existing in the prior art, the invention proposes a kind of Display Aim Taking on TV Set System dynamic is minimum distinguishable right
Than degree test device and method.
The technical scheme is that：
A kind of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device, it is characterised in that：Including target
Integrating sphere (1), target light source system (2), targeted surveillance illumination photometer (3), target runner (4), background integrating sphere (5), bias light
Source system (6), background monitor illumination photometer (7), filter set (8), collimating optical system, dynamic analog platform (12), monitor
(13)；
The output intensity of the target integrating sphere (1) is continuously adjustable, and targeted surveillance illumination photometer (3) is located at target integrating sphere
(1) side wall, can the illumination to target integrating sphere (1) monitor and feed back in real time；
The output intensity of the background integrating sphere (5) is continuously adjustable, and background monitoring illumination photometer (7) is located at background integrating sphere
(5) side wall, can the illumination to background integrating sphere (5) monitor and feed back in real time；
The target runner (4) is located between target integrating sphere (1) and background integrating sphere (5), is shone by target integrating sphere (1)
After bright, target image enters background integrating sphere (5), contrast target required for generating；The target runner (4) is by multiple groups
The target composition chequered with black and white, line width is equal, spatial frequency is different, size is different, selects corresponding frequencies according to testing requirement
Target is rotated to the light passing position between target integrating sphere (1) and background integrating sphere (5)；
The outlet port of the background integrating sphere (5) is located at the position of focal plane of collimating optical system；
The filter set (8) is located at the outlet port of background integrating sphere (5)；
The dynamic analog platform (12) can simulate Display Aim Taking on TV Set System for fixed tested Display Aim Taking on TV Set System (11)
The application state of rotation or vibration；
The monitor (13) connect with tested Display Aim Taking on TV Set System (11), and tested Display Aim Taking on TV Set System (11) receives quasi-
The directional light of straight optical system output, target image is output on monitor (13), is determined by human eye or computer software
Minimum resolvable contrast.
Further preferred embodiment, a kind of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device,
It is characterized in that：Collimating optical system is made of plane mirror (9), off-axis parabolic mirror (10)；The background integrating sphere
(5) outlet port is located at the position of focal plane of off-axis parabolic mirror (10).
Further preferred embodiment, a kind of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device,
It is characterized in that：The target light source system (2) is identical as background light source system (6) structure, by fan, mirror condenser, light
Source, stepper motor, guide rail, retracting cylinder composition；It is moved forward and backward by step motor control retracting cylinder, control light source enters integrating sphere
Light cone angle, realize the continuously adjustable of integrating sphere output illuminance.
Further preferred embodiment, a kind of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device,
It is characterized in that：Target light source system (2) and the colour temperature of the light source in background light source system (6), chromaticity coordinates pass through calibrating and measuring,
The spectral power distribution and colour temperature output for ensuring to export by the control of accurate current regulator power supply are stablized.
Further preferred embodiment, a kind of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device,
It is characterized in that：Tested Display Aim Taking on TV Set System (11) are placed in collimated light path, according to the focal length of tested Display Aim Taking on TV Set System, matching
The collimating optical system of respective focal can obtain requiring on a monitor the observed image of multiplying power.
Further preferred embodiment, a kind of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device,
It is characterized in that：Dynamic analog platform (12) can be realized uniaxial rotation or precision vibration, realize that simulation uniform motion, fortune accelerate fortune
Dynamic, simple harmonic motion, vibration motion state.
The method for carrying out the test of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast using above-mentioned apparatus, feature exist
In：Include the following steps：
The first step initializes the running parameter of tested Display Aim Taking on TV Set System (11)；
Second step acquires the background image F of tested Display Aim Taking on TV Set System (11) according to instructionb, and be stored in memory；
Third step, according to instruction, the brightness that target light source system (2) are arranged is Lt, the brightness of background light source system (6) is
Lb, make its work within the working range of tested Display Aim Taking on TV Set System (11)；And target runner (4) are rotated, selection is corresponding
Tested target is rotated to light passing position；
4th step acquires the tested contrast image F of Display Aim Taking on TV Set System (11) in the quiescent states, called from memory
Background image Fb, by the contrast image F under static statesBackground image F is reduced according to the corresponding mode of pixelbThe ash of each pixel
Angle value obtains test image Fs', while the image is shown on monitor (13)；
Band target pattern is differentiated by monitor (13), the most slice band target pattern that recording can tell corresponds to target
The serial number (i, j) of line unit；It tables look-up and finds the target line unit line thickness of serial number (i, j), corresponding space frequency is calculated by following formula
Rate f, unit are line to every millimeter (lp/mm)：
F (lp/mm)=2i+(j-1)/6
In formula, i and j are respectively corresponding group of number of target and unit number；
5th step, according to the working region of the target line unit number selection image procossing of the 4th step selection, by the workspace
The test image F in domain1And in gray matrix deposit memory；Gray value in gray matrix is ranked up, is found out therein
Maximum value LmaxWith minimum value Lmin, calculate according to following formula in spatial frequency f and scene average luminance Lm=(Lb+Lt)/2
Under Minimum resolvable contrast MRC：
The dynamic parameter of dynamic analog platform (13) is set as needed in 6th step, acquires tested Display Aim Taking on TV Set System (11)
Contrast image F in a dynamic state2And it is stored in memory；
7th step, with F1Image grayscale matrix as template, by line by line pixel-by-pixel in a manner of traverse entire dynamic image F2
In, and it is calculate by the following formula cross-correlation coefficient between the two：
In formula, M and N distinguish F1Image template is in dynamic image F2The line number and columns of middle traversal, F1(xi, yj) correspond to F1Figure
As (x in templatei, yj) position gray value, F2(xi, yj) correspond to F2(x in imagei, yj) position gray value,WithRespectively
For template F1Image and F2The average value of pixel grey scale in image；
8th step finds out the maximum value ρ in cross-correlation coefficientmaxAnd its corresponding serial number (i ', j '), according to matching unit
Serial number (i ', j ') selection image processing region, by the test image F of the processing region3And its in gray scale deposit memory, to it
Gray value in gray matrix is ranked up, and finds out maximum value L 'maxWith minimum value L 'min, calculate under dynamic condition according to the following formula
Minimum resolvable contrast.
9th step changes target light source system (2) and background within the working range of tested Display Aim Taking on TV Set System (11)
The brightness of light-source system (6) repeats third step to the 8th step, obtains a series of MRC values under different scenes average brightness.
Beneficial effect
Overall technology effect of the invention is embodied in the following aspects：
(1) present invention enters the light cone angle of integrating sphere by controlling light source using a kind of flexible light source technology of program control type
Realize the automatic continuous adjustable of light-source system output intensity, the method overcome by adjusting voltage and optical device (such as attenuator)
Method brought by objective optics contrast variation range cannot be accurate continuously adjustable disadvantage.
(2) present invention point uses discrete colimated light system, can match different focal length according to tested camera focus size
Off axis paraboloidal mirror, replacement is convenient, applied widely, overcomes that integrated collimation lens is non-exchange, the poor disadvantage of matching.
(3) present invention can simulate infinity by the way that tested Display Aim Taking on TV Set System to be placed among collimating optical system
Low contrast target, uniaxial rotation or precision vibration are generated in conjunction with dynamic analog platform, to simulate uniform motion, fortune accelerates fortune
It is minimum distinguishable to realize the Display Aim Taking on TV Set System progress dynamic in laboratory for the various motion states such as dynamic, simple harmonic motion, vibration
Contrast measurement.
(4) when dynamic analog platform is motionless, measuring device according to the present invention has just had both the measurement function of static MRC
Can, it can be convenient scientific research personnel and the measurement result of dynamic MR C He static state MRC compared, so that quantitative analysis is due to fortune
The degree of the dynamic image quality decline introduced.
Detailed description of the invention
Fig. 1 is that dynamic Minimum resolvable contrast test device of the present invention constitutes schematic diagram.
Fig. 2 is the target illuminating source system composition schematic diagram of dynamic Minimum resolvable contrast test device of the present invention.
Fig. 3 is the common USAF1951 test target signal of dynamic Minimum resolvable contrast test device of the present invention
Figure.
Specific embodiment
With reference to the accompanying drawing and preferred embodiment the invention will be further described.
As shown in Figure 1, the dynamic Minimum resolvable contrast test device in the present embodiment include target integrating sphere (1),
Target light source system (2), targeted surveillance illumination photometer (3), target runner (4), background integrating sphere (5), background light source system (6),
Background monitors illumination photometer (7), filter set (8), plane mirror (9), off-axis parabolic mirror (10), dynamic analog platform
(12), monitor (13).
The target integrating sphere (1) and background integrating sphere (5) are the key that form diffusing reflection light source, they are by two inner walls
It is coated with the hemispherical Shell composition of white diffusing reflection layer, the relevant parameter of the integrating sphere in the present invention is true by illumination diffusion calculation formula
Fixed, target integrating sphere diameter 120mm, Background Integral bulb diameter is 500mm, effective clear aperature 50mm, in this preferred embodiment
In, the exit illuminance uniformity of target integrating sphere (3) and background integrating sphere (5) can reach 5%, and local homogeneity can reach
2%, thus effectively reduce due to the time of light source and space it is unstable or uneven caused by MRC processing error.
The target light source system (2) is by fan (2-1), mirror condenser (2-2), light source (2-3), stepper motor (2-
4), guide rail (2-5), retracting cylinder (2-6) composition.It is moved forward and backward by step motor control retracting cylinder, control light source enters integral
The light cone angle of ball realizes the continuously adjustable of target integrating sphere (1) output illuminance；The structure and function of background light source system (6)
It is identical as target light source system (2).In the present embodiment, fan (2-1) generally select 12V DC power supply, revolution be 700 to
1400+15%RPM；The face mirror condenser (2-2) shape is paraboloid, and highly reflecting films are plated on surface；The halogen tungsten of light source selection 100W
Lamp, spectral region：380-1080nm；Stepper motor model is LMA-TR-200-G10, stroke 200mm, resetting essence
Degree is less than 3 μm.
The target runner (4) is located between target integrating sphere (1) and background integrating sphere (5), is shone by target integrating sphere (1)
After bright, into background integrating sphere (5), contrast target required for generating；In the preferred embodiment, target is selected
USAF1951 resolving power target has 6 groups of target line units, i.e., the equal in width formed on target surface and the equidistant bright filaments of sun thereon
Line, every group of target line unit are made of three isometric horizontal target lines and three vertical target lines, and the length of target line is target line width
Five times, target line width and adjacent target line interval are equal, and the spacing of horizontal target line and vertical target line is twice of target line width, from
Maximum one group of target line unit rises, and the close target line unit of every two packet size is pressedScale smaller.
The plane mirror (9) and the off-axis parabolic mirror (10) form collimating optical system, filter set
(8) it is in the focal position of off-axis parabolic mirror (10).In the present embodiment, the bore of off-axis parabolic mirror (10)
For 210mm, focal length 2000mm.Filter set (1-4) is made of two panels, and the first optical filter is narrow band filter, central wavelength
For 546nm, half-band width 10nm；Second optical filter is bandpass filter, and spectral region is 400nm~780nm, bandwidth 380nm.
The dynamic analog platform (12) simulates Display Aim Taking on TV Set System rotation for fixed tested Display Aim Taking on TV Set System (11)
Or the application state of vibration.In the preferred embodiment, J-21036 shake table, the vibration frequency of shake table are selected：2-100Hz；
Vibration amplitude：0.01~5 °；Direction：Rolling direction；Target；Motion state：Uniform motion, fortune accelerated motion, simple harmonic motion, vibration
A variety of different motion states such as dynamic.
The monitor (13) connect with tested Display Aim Taking on TV Set System (11), and tested Display Aim Taking on TV Set System (11) receives quasi-
The directional light of straight optical system output, target image is output on monitor (13), is determined by human eye or computer software
Minimum resolvable contrast.
The Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device realizes the measurement method of MRC, feature
It is：This approach includes the following steps：
The first step initializes the running parameter of the tested Display Aim Taking on TV Set System (11)；
Second step acquires the background image F of the tested Display Aim Taking on TV Set System (11) according to keyboard instructionb, and deposit
In reservoir；
Third step, according to keyboard instruction, the brightness that target light source system (2) are arranged is Lt, background light source system (6) it is bright
Degree is Lb, work is allowed within the working range of tested Display Aim Taking on TV Set System (11)；And target runner (4) are rotated, selection is suitable
When tested target rotate to light passing position；
4th step acquires the tested contrast image F of Display Aim Taking on TV Set System (11) in the quiescent states, called from memory
Background image Fb, by the contrast image F under static statesBackground image F is reduced according to the corresponding mode of pixelbThe ash of each pixel
Angle value obtains test image Fs', while the image is shown on monitor (13).Observer passes through monitor (13) lucky energy
When differentiating (50% probability) shaping band target pattern, the serial number (i, j) of corresponding matching target line unit is recorded；It reads according to the observation
(i, j), the width of lines is found by tabling look-up, corresponding spatial frequency f is calculated by following formula, unit is line to every millimeter of (lp/
mm).
F (lp/mm)=2i+(j-1)/6 (1)
In formula, i and j are respectively corresponding group of number of target and unit number.
5th step, the matching target line unit number of selection selects the working region of image procossing according to the observation, by the work
Make the test image F in region1And gray matrix deposit memory is wherein.Gray value in gray matrix is ranked up, is found out
Maximum value L thereinmaxWith minimum value Lmin, calculate according to following formula in spatial frequency f and scene average luminance Lm=(Lb+
LtMinimum resolvable contrast MRC under)/2.
The dynamic parameter of dynamic analog platform (13) is arranged as needed in 6th step, acquires tested Display Aim Taking on TV Set System (11)
Contrast image F in a dynamic state2And it is stored in memory；
7th step, with F1Image grayscale matrix as template, by line by line pixel-by-pixel in a manner of traverse entire dynamic image F2
In, and it is calculate by the following formula cross-correlation coefficient between the two：
In formula, M and N distinguish F1Image template is in dynamic image F2The line number and columns of middle traversal, F1(xi, yj) correspond to F1Figure
As (x in templatei, yj) position gray value, F2(xi, yj) correspond to F2(x in imagei, yj) position gray value,WithRespectively
For template F1Image and F2The average value of pixel grey scale in image；
8th step finds out the maximum value ρ in cross-correlation coefficientmaxAnd its serial number (i ', j ') of corresponding matching target line unit,
According to matching unit serial number (i ', j ') selection image processing region, by the test image F of the processing region3And its gray scale deposit
In memory, the gray value in its gray matrix is ranked up, finds out maximum value L 'maxWith minimum value L 'min, according to formula
(4) Minimum resolvable contrast under dynamic condition is calculated.
9th step changes target light source system (2) and background within the working range of tested Display Aim Taking on TV Set System (11)
The brightness of light-source system (6) repeats third step to the 8th step, obtains a series of MRC values under different scenes average brightness.Then
It can be estimated using this series of MRC value for the operating distance of Display Aim Taking on TV Set System and support is provided.
Claims (7)
1. a kind of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device, it is characterised in that：Including target integrating sphere
(1), target light source system (2), targeted surveillance illumination photometer (3), target runner (4), background integrating sphere (5), background light source system
(6), background monitors illumination photometer (7), filter set (8), collimating optical system, dynamic analog platform (12), monitor (13)；
The output intensity of the target integrating sphere (1) is continuously adjustable, and targeted surveillance illumination photometer (3) is located at target integrating sphere (1)
Side wall, can the illumination to target integrating sphere (1) monitor and feed back in real time；
The output intensity of the background integrating sphere (5) is continuously adjustable, and background monitoring illumination photometer (7) is located at background integrating sphere (5)
Side wall, can the illumination to background integrating sphere (5) monitor and feed back in real time；
The target runner (4) is located between target integrating sphere (1) and background integrating sphere (5), illuminates it by target integrating sphere (1)
Afterwards, target image enters background integrating sphere (5), contrast target required for generating；The target runner (4) is by multiple groups black and white
The target composition alternate, line width is equal, spatial frequency is different, size is different, the target of corresponding frequencies is selected according to testing requirement
It rotates to the light passing position between target integrating sphere (1) and background integrating sphere (5)；
The outlet port of the background integrating sphere (5) is located at the position of focal plane of collimating optical system；
The filter set (8) is located at the outlet port of background integrating sphere (5)；
The dynamic analog platform (12) can simulate Display Aim Taking on TV Set System rotation for fixed tested Display Aim Taking on TV Set System (11)
Or the application state of vibration；
The monitor (13) connect with tested Display Aim Taking on TV Set System (11), and tested Display Aim Taking on TV Set System (11) receives collimated light
The directional light of system output, target image is output on monitor (13), determines minimum by human eye or computer software
Distinguishable contrast.
2. a kind of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device, feature exist according to claim 1
In：Collimating optical system is made of plane mirror (9), off-axis parabolic mirror (10)；The background integrating sphere (5) goes out
Mouth position is located at the position of focal plane of off-axis parabolic mirror (10).
3. a kind of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device according to claim 1 or claim 2, feature
It is：The target light source system (2) is identical as background light source system (6) structure, by fan, mirror condenser, light source, step
Into motor, guide rail, retracting cylinder composition；It is moved forward and backward by step motor control retracting cylinder, control light source enters the light of integrating sphere
Line cone angle realizes the continuously adjustable of integrating sphere output illuminance.
4. a kind of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device, feature exist according to claim 3
In：Target light source system (2) and the colour temperature of the light source in background light source system (6), chromaticity coordinates pass through calibrating and measuring, pass through essence
The spectral power distribution and colour temperature output that close current regulator power supply control ensures to export are stablized.
5. a kind of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device, feature exist according to claim 1
In：Tested Display Aim Taking on TV Set System (11) are placed in collimated light path, according to the focal length of tested Display Aim Taking on TV Set System, are matched corresponding burnt
Away from collimating optical system, can obtain requiring the observed image of multiplying power on a monitor.
6. a kind of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast test device, feature exist according to claim 1
In：Dynamic analog platform (12) can be realized uniaxial rotation or precision vibration, and uniform motion is simulated in realization, fortune accelerates, simple harmonic quantity
The motion state of movement, vibration.
7. the method for carrying out the test of Display Aim Taking on TV Set System dynamic Minimum resolvable contrast using claim 1 described device,
It is characterized in that：Include the following steps：
The first step initializes the running parameter of tested Display Aim Taking on TV Set System (11)；
Second step acquires the background image F of tested Display Aim Taking on TV Set System (11) according to instructionb, and be stored in memory；
Third step, according to instruction, the brightness that target light source system (2) are arranged is Lt, the brightness of background light source system (6) is Lb, make
Its work is within the working range of tested Display Aim Taking on TV Set System (11)；And target runner (4) are rotated, select tested target accordingly
Mark is rotated to light passing position；
4th step acquires the tested contrast image F of Display Aim Taking on TV Set System (11) in the quiescent states, Background is called from memory
As Fb, by the contrast image F under static statesBackground image F is reduced according to the corresponding mode of pixelbThe gray value of each pixel, obtains
To test image Fs', while the image is shown on monitor (13)；
Band target pattern is differentiated by monitor (13), the most slice band target pattern that recording can tell corresponds to target line list
The serial number (i, j) of member；It tables look-up and finds the target line unit line thickness of serial number (i, j), corresponding spatial frequency f is calculated by following formula,
Unit is line to every millimeter：
F (lp/mm)=2i+(j-1)/6
In formula, i and j are respectively corresponding group of number of target and unit number；
5th step, according to the working region of the target line unit number selection image procossing of the 4th step selection, by the working region
Test image F1And in gray matrix deposit memory；Gray value in gray matrix is ranked up, maximum therein is found out
Value LmaxWith minimum value Lmin, calculate according to following formula in spatial frequency f and scene average luminance Lm=(Lb+LtUnder)/2
Minimum resolvable contrast MRC：
The dynamic parameter of dynamic analog platform (13) is set as needed in 6th step, acquires tested Display Aim Taking on TV Set System (11) dynamic
Contrast image F under state2And it is stored in memory；
7th step, with F1Image grayscale matrix as template, by line by line pixel-by-pixel in a manner of traverse entire dynamic image F2In, and
It is calculate by the following formula cross-correlation coefficient between the two：
In formula, M and N distinguish F1Image template is in dynamic image F2The line number and columns of middle traversal, F1(xi,yj) correspond to F1Image mould
(x in platei,yj) position gray value, F2(xi,yj) correspond to F2(x in imagei,yj) position gray value,WithRespectively mould
Plate F1Image and F2The average value of pixel grey scale in image；
8th step finds out the maximum value ρ in cross-correlation coefficientmaxAnd its corresponding serial number (i ', j '), according to matching unit serial number
(i ', j ') selection image processing region, by the test image F of the processing region3And its in gray scale deposit memory, to its gray scale
Gray value in matrix is ranked up, and finds out maximum value L 'maxWith minimum value L 'min, calculate under dynamic condition according to the following formula most
Small distinguishable contrast.
9th step changes target light source system (2) and background light source within the working range of tested Display Aim Taking on TV Set System (11)
The brightness of system (6) repeats third step to the 8th step, obtains a series of MRC values under different scenes average brightness.
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