CN108742502A - A kind of detection method of the movement sinusoidal grating sensing capability of intensification modulation - Google Patents
A kind of detection method of the movement sinusoidal grating sensing capability of intensification modulation Download PDFInfo
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Abstract
The invention discloses a kind of detection methods of the movement sinusoidal grating sensing capability of intensification modulation, including：Grating movement function is built based on grating average brightness, grating contrast, grating spatial frequency, grating movement velocity and direction, grating orientation, raster phase；The first value is taken in raster phase, the grating direction of motion takes A or B, other to be worth in the case of fixed value, to take grating contrast CzGrating movement function is substituted into, grating motion diagram is obtained；To measured's display raster motion diagram；When the grating direction of motion of measured's input is identical as the grating direction of motion of grating motion diagram, Cz=Cz× (1-R) substitutes into grating movement function, until the grating direction of motion of input is different from the grating direction of motion of grating motion diagram, output target grating motion diagram；Otherwise, Cz=Cz× (1+R) substitutes into grating movement function, until the grating direction of motion of input is identical with the grating motion diagram grating direction of motion, output grating motion diagram；According to the grating contrast of grating motion diagram, measured's sensing capability is obtained.
Description
Technical field
The present invention relates to technical field of vision detection more particularly to a kind of movement sinusoidal grating sensing capabilities of intensification modulation
Detection method.
Background technology
The vision system of mankind's Different Individual is not exactly the same to the sensing capability of movable information.Under normal circumstances, not at
The vision system of year people is relatively low to the sensing capability of movable information, and the vision system of adult is to the perception energy of movable information
Power is relatively high.
It is a kind of simple Motor stimulation to move sinusoidal grating, can be used for detecting sense of the different vision systems to movable information
Know ability.
Invention content
Technical problems based on background technology, the present invention propose a kind of movement sinusoidal grating perception of intensification modulation
The detection method of ability；
A kind of detection method of the movement sinusoidal grating sensing capability of intensification modulation proposed by the present invention, including：
S1, grating average brightness, grating contrast, grating spatial frequency, grating movement velocity and direction, grating side are based on
Position and raster phase build grating movement function；
S2, preset value, raster phase are taken in grating average brightness, grating spatial frequency, grating orientation, grating movement velocity
In the case of taking the first value, the grating direction of motion to take A or B, a value C is taken in grating contrast value rangezSubstitute into grating
In movement function, target grating motion diagram is obtained；
S3, it shows target grating motion diagram to testee, receives the prediction grating direction of motion of testee's input；
S4, when testee input the prediction grating direction of motion it is identical as the grating direction of motion of target grating motion diagram
When, enable Cz=Cz× (1-R) executes step S2, until the prediction grating direction of motion and the target grating of testee's input move
When the grating direction of motion of figure differs, the target grating motion diagram is exported；Otherwise, C is enabledz=Cz× (1+R) executes step
S2, it is defeated when the prediction grating direction of motion of testee's input is identical as the grating direction of motion of target grating motion diagram
Go out the target grating motion diagram, R is than numerical constant；
The grating contrast of S5, output target grating stimulation figure, the grating contrast of the target grating stimulation figure are
The moving grating sensing capability of testee.
Preferably, step S1 is specifically included：
Grating movement function：L (x, y)=Lmean× { 1+C × sin { 2 π [f (ycos θ-xsin θ)+ω t]+Φ } },
Wherein, LmeanFor grating average brightness, C be grating contrast, f is grating spatial frequency, ω is grating movement speed
Degree and direction, ω numerical values reciteds represent grating movement velocity, ω numerical value it is positive and negative represent the grating direction of motion, θ as grating orientation,
Ф is raster phase.
Preferably, in step S2, the A is positive value, and B is negative value.
Preferably, in step S2, the value range of first value is 0 to 2 π.
Preferably, when executing step S2 every time, the first value takes any one value in value range.
The present invention by the grating motion diagram different to testee's display raster contrast, the grating direction of motion is different,
The grating direction of motion in grating motion diagram is identified in measured, when the identification of measured's grating direction of motion is correct, drop
The grating contrast of low grating motion diagram increases the identification difficulty of measured, when measured can not identify, exports the light
Grid motion diagram；When the identification of measured's grating direction of motion is incorrect, the grating contrast of grating motion diagram is improved, is reduced tested
The identification difficulty of person exports the grating motion diagram, then obtain corresponding with grating motion diagram when measured's identification is correct
Sensing capability, to complete to detect the moving grating sensing capability of measured, this method is simple and convenient, and accuracy rate is high, can be certainly
It is dynamic that setting contrast is carried out according to the sensing capability of measured, it is highly practical, it uses manpower and material resources sparingly.
Description of the drawings
Fig. 1 is that a kind of flow of the detection method of the movement sinusoidal grating sensing capability of intensification modulation proposed by the present invention is shown
It is intended to；
Fig. 2 is the grating motion diagram of different grating contrasts in grating movement function in the present invention.
Specific implementation mode
Referring to Fig.1, the detection method of the movement sinusoidal grating sensing capability of a kind of intensification modulation proposed by the present invention, packet
It includes：
Step S1, based on grating average brightness, grating contrast, grating spatial frequency, grating movement velocity and direction, light
Grid orientation and raster phase build grating movement function, specifically include：
Grating movement function：L (x, y)=Lmean× { 1+C × sin { 2 π [f (ycos θ-xsin θ)+ω t]+Φ } },
Wherein, LmeanFor grating average brightness, C be grating contrast, f is grating spatial frequency, ω is grating movement side
To, θ be grating orientation, Ф is raster phase.
Step S2 takes preset value, grating in grating average brightness, grating spatial frequency, grating orientation, grating movement velocity
In the case that phase takes the first value, the grating direction of motion to take A or B, a value C is taken in grating contrast value rangezIt substitutes into
In grating movement function, target grating motion diagram is obtained, the A is positive value, and B is negative value, and the value range of first value is 0
To 2 π, when executing step S2 every time, the first value takes any one value in value range.
In concrete scheme, LmeanFor grating average brightness, reality can be in (0.0-500.0cd/m when measuring2) between it is arbitrary
Adjustment.But adjustment need to be completed before measuring, cannot be adjusted again in entire measurement process after adjustment, after the completion of one-shot measurement,
Can be adjusted again measure next time before；Grating spatial frequency f, i.e. how many period in the spatial dimension at once visual angle；θ
For grating orientation, the angle of grating is indicated, such as vertically, laterally etc.；Ф is raster phase, in each measurement process, grating
Phase changes at random in its value range, in order to increasing the difficulty of measured's grating direction of motion identification；ω is
Grating movement velocity and direction, numerical values recited represent movement velocity, and the positive and negative of numerical value represents the direction of motion, and positive value and negative value correspond to
The grating direction of motion it is just the opposite, measured need to judge the ω in target grating motion diagram indicate direction.
With reference to figure 2, C is grating contrast；It is from left to right gradually reduced, C is smaller, and it is bigger to measure corresponding grade of difficulty；C
It is bigger, it is smaller to measure corresponding grade of difficulty.
Step S3 shows target grating motion diagram to testee, receives the prediction grating movement side of testee's input
To.
Step S4, when the grating direction of motion of prediction the grating direction of motion and target grating motion diagram of testee's input
When identical, C is enabledz=Cz× (1-R) executes step S2, until the prediction grating direction of motion and target grating of testee's input
When the grating direction of motion of motion diagram differs, the target grating motion diagram is exported；Otherwise, C is enabledz=Cz× (1+R) executes step
Rapid S2, when the prediction grating direction of motion of testee's input is identical as the grating direction of motion of target grating motion diagram,
The target grating motion diagram is exported, R is than numerical constant；
Step S5, the grating contrast of output target grating stimulation figure, the grating contrast of the target grating stimulation figure
The as moving grating sensing capability of testee.
In concrete scheme, show that target grating motion diagram, testee are sentenced into the line raster direction of motion to testee
The disconnected and input prediction grating direction of motion, when the light of prediction the grating direction of motion and target grating motion diagram of testee's input
When the grid direction of motion is identical, the grating contrast of target grating motion diagram is reduced, the identification difficulty of measured is increased, until tested
When person can not identify, the target grating motion diagram is exported；When the identification of measured's direction of motion is incorrect, target grating is improved
The grating contrast of motion diagram reduces the identification difficulty of measured, when measured's identification is correct, exports the target grating
Motion diagram, R are than numerical constant, and for controlling measuring accuracy, R is smaller, and measuring accuracy is higher.
The grating contrast of target grating stimulation figure is exported, the grating contrast of the target grating stimulation figure is tested
The moving grating sensing capability of examination person, to complete the sensing capability test to measured.
Present embodiment is moved by the grating different to testee's display raster contrast, the grating direction of motion is different
The grating direction of motion in grating motion diagram is identified in figure, measured, when the identification of measured's grating direction of motion is correct,
The grating contrast for reducing grating motion diagram, increases the identification difficulty of measured, when measured can not identify, described in output
Grating motion diagram；When the identification of measured's grating direction of motion is incorrect, the grating contrast of grating motion diagram is improved, quilt is reduced
The identification difficulty of survey person exports the grating motion diagram, then obtain corresponding with grating motion diagram when measured's identification is correct
Sensing capability, to complete to detect to the moving grating sensing capability of measured, this method is simple and convenient, and accuracy rate is high, energy
Setting contrast is carried out automatically according to the sensing capability of measured, it is highly practical, it uses manpower and material resources sparingly.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of detection method of the movement sinusoidal grating sensing capability of intensification modulation, which is characterized in that including：
S1, based on grating average brightness, grating contrast, grating spatial frequency, grating movement velocity and direction, grating orientation and
Raster phase builds grating movement function；
S2, preset value, raster phase is taken to take in grating average brightness, grating spatial frequency, grating orientation, grating movement velocity
One value in the case that the grating direction of motion takes A or B, takes a value C in grating contrast value rangezSubstitute into grating movement
In function, target grating motion diagram is obtained；
S3, it shows target grating motion diagram to testee, receives the prediction grating direction of motion of testee's input；
S4, when testee input the prediction grating direction of motion it is identical as the grating direction of motion of target grating motion diagram when,
Enable Cz=Cz× (1-R) executes step S2, until the prediction grating direction of motion and the target grating motion diagram of testee's input
When the grating direction of motion differs, the target grating motion diagram is exported；Otherwise, C is enabledz=Cz× (1+R) executes step S2, directly
When the prediction grating direction of motion inputted to testee is identical as the grating direction of motion of target grating motion diagram, described in output
Target grating motion diagram, R are than numerical constant；
The grating contrast of S5, output target grating stimulation figure, the grating contrast of the target grating stimulation figure is tested
The moving grating sensing capability of examination person.
2. the detection method of the movement sinusoidal grating sensing capability of intensification modulation according to claim 1, which is characterized in that
Step S1, specifically includes：
Grating movement function：L (x, y)=Lmean× { 1+C × sin { 2 π [f (ycos θ-xsin θ)+ω t]+Φ } }, wherein Lmean
For grating average brightness, C be grating contrast, f is grating spatial frequency, ω is grating movement velocity and direction, and ω numerical value is big
Small to represent grating movement velocity, the positive and negative grating direction of motion, the θ of representing of ω numerical value is grating orientation, Ф as raster phase.
3. the detection method of the movement sinusoidal grating sensing capability of intensification modulation according to claim 1, which is characterized in that
In step S2, the A is positive value, and B is negative value.
4. the detection method of the movement sinusoidal grating sensing capability of intensification modulation according to claim 1, which is characterized in that
In step S2, the value range of first value is 0 to 2 π.
5. the detection method of the movement sinusoidal grating sensing capability of intensification modulation according to claim 4, which is characterized in that
When executing step S2 every time, the first value takes any one value in value range.
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Cited By (1)
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| CN112842248A (en) * | 2020-12-31 | 2021-05-28 | 北京大学第三医院（北京大学第三临床医学院） | Dynamic contrast sensitivity test system and test method thereof |
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