CN108670194B - Detection method for perception capability of contrast-modulated motion sinusoidal grating - Google Patents

Detection method for perception capability of contrast-modulated motion sinusoidal grating Download PDF

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CN108670194B
CN108670194B CN201810246735.0A CN201810246735A CN108670194B CN 108670194 B CN108670194 B CN 108670194B CN 201810246735 A CN201810246735 A CN 201810246735A CN 108670194 B CN108670194 B CN 108670194B
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汤勇
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Kefei Yunshi Tianjin High Tech Co ltd
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Abstract

The invention discloses a method for detecting the perception capability of a contrast-modulated motion sinusoidal grating, which comprises the following steps: constructing a grating motion function based on the grating average brightness, the grating contrast, the grating spatial frequency, the random carrier, the carrier contrast, the grating motion speed and direction, the grating orientation and the grating phase; the grating phase takes a first value, the random carrier takes a second value, the grating motion direction takes A or B, the other values take preset values, and the grating contrast C is taken1Substituting the grating motion function to obtain a grating motion diagram; showing the grating motion diagram to the testee; the moving direction of the grating input by the measured person is the same as that of the grating moving pattern C1＝C1× (1-R) is substituted into the grating motion function until the two are different, and a target grating motion picture is output, otherwise, C1＝C1× (1+ R) is substituted into the grating movement function until the input grating movement direction is the same as the grating movement direction of the grating movement diagram, and the grating movement diagram is output, and the movement perception capability of the tested person is obtained according to the grating movement diagram.

Description

Detection method for perception capability of contrast-modulated motion sinusoidal grating
Technical Field
The invention relates to the technical field of visual detection, in particular to a detection method of the perception capability of a contrast-modulated motion sinusoidal grating.
Background
The perception of motion information by the visual system of different individuals is not exactly the same. In general, the visual system of minors has a relatively low ability to perceive motion information, while the visual system of adults has a relatively high ability to perceive motion information.
The motion sinusoidal grating is a simple motion stimulus and can be used for detecting the perception capability of different visual systems on motion information.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a detection method of the perception capability of a contrast-modulated motion sinusoidal grating;
the invention provides a detection method of perception capability of a contrast-modulated motion sinusoidal grating, which comprises the following steps:
s1, constructing a grating motion function based on the average grating brightness, the grating contrast, the grating spatial frequency, the random carrier, the carrier contrast, the grating motion speed and direction, the grating orientation and the grating phase;
s2, taking preset values of grating average brightness, grating spatial frequency, carrier contrast, grating direction and grating motion speed, taking a first value of grating phase, a second value of random carrier and A or B value of grating motion direction, and taking a value C in the range of grating contrast value1Substituting the grating motion function into a target grating motion graph;
s3, displaying a target grating motion diagram to a tested person, and receiving a predicted grating motion direction input by the tested person;
s4, when the predicted raster movement direction input by the testee is the same as the raster movement direction of the target raster movement diagram, let C1＝C1× (1-R) executing step S2 until the predicted raster movement direction input by the testee is different from the raster movement direction of the target raster movement pattern, otherwise, making C1＝C1× (1+ R) executing step S2, until the predicted raster movement direction input by the testee is the same as the raster movement direction of the target raster movement diagram, outputting the target raster movement diagram, wherein R is a ratio constant;
and S5, outputting the grating contrast of the target grating stimulus pattern, wherein the grating contrast of the target grating stimulus pattern is the motion grating perception capability of the testee.
Preferably, step S1 specifically includes:
grating motion function:
l(x，y)＝Lmean×{1+R(x，y)×Cc×{C×sin[2π(f(ycosθ-xsinθ)+ωt)+Φ]} which is a measure of the relative position of the rotor and the rotorIn, LmeanIs the average brightness of the grating, C is the grating contrast, f is the grating spatial frequency, R (x, y) is the random carrier, CcThe carrier contrast and omega are the moving speed and direction of the grating, the value of omega represents the moving speed of the grating, the positive and negative values of the value of omega represent the moving direction of the grating, theta is the azimuth of the grating, and phi is the phase of the grating.
Preferably, in step S2, a is a positive value and B is a negative value.
Preferably, in step S2, the first value ranges from 0 to 2 pi.
Preferably, the first value takes any one of values of 0 to 2 pi each time step S2 is performed.
Preferably, the second value is a random value each time step S2 is performed.
The grating motion diagram with different grating contrast and different grating motion directions is displayed to a testee, the testee identifies the grating motion direction in the grating motion diagram, when the grating motion direction of the testee is identified correctly, the grating contrast of the grating motion diagram is reduced, the identification difficulty of the testee is increased, and the grating motion diagram is output until the testee cannot identify the grating motion diagram; when the grating motion direction of the measured person is not identified correctly, the grating contrast of the grating motion diagram is improved, the identification difficulty of the measured person is reduced, the grating motion diagram is output until the measured person is identified correctly, and the sensing capability corresponding to the grating motion diagram is obtained, so that the sensing capability detection of the measured person is completed.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting perception capability of a contrast-modulated moving sinusoidal grating according to the present invention;
FIG. 2 is a graph of grating motion for different grating contrasts in the grating motion function of the present invention.
Detailed Description
Referring to fig. 1, the method for detecting perception capability of a contrast-modulated moving sinusoidal grating provided by the invention comprises the following steps:
step S1, constructing a grating motion function based on the grating average brightness, the grating contrast, the grating spatial frequency, the random carrier, the carrier contrast, the grating motion speed and direction, the grating orientation, and the grating phase, specifically including:
grating motion function:
l(x，y)＝Lmean×{1+R(x，y)×Cc×{C×sin[2π(f(ycosθ-xsinθ)+ωt)+Φ]} in which L ismeanIs the average brightness of the grating, C is the grating contrast, f is the grating spatial frequency, R (x, y) is the random carrier, CcThe carrier contrast and omega are the moving speed and direction of the grating, the value of omega represents the moving speed of the grating, the positive and negative values of the value of omega represent the moving direction of the grating, theta is the azimuth of the grating, and phi is the phase of the grating.
Step S2, when the average brightness, spatial frequency, carrier contrast, orientation and movement speed of grating are preset, the phase of grating is the first value, the random carrier is the second value, and the movement direction of grating is A or B, the value C is selected in the range of grating contrast1And substituting the obtained result into a grating motion function to obtain a target grating motion graph, wherein A is a positive value, B is a negative value, the value range of the first value is 0-2 pi, when the step S2 is executed each time, the first value is any one of the values of 0-2 pi, and when the step S2 is executed each time, the second value is a random value.
In a specific embodiment, LmeanThe actual measurement time can be (0.0-500.0 cd/m) for the average brightness of the grating2) And optionally adjusting. The adjustment is required to be completed before the measurement, the adjustment cannot be performed again in the whole measurement process after the adjustment, and the adjustment can be performed again before the next measurement after one measurement is completed; the grating spatial frequency f, i.e. how many periods there are within the spatial range of a one-degree view; θ is the grating orientation, indicating the angle of the grating, e.g., vertical, lateral, etc.; r (x, y) is a carrier wave formed by random noise points, CcThe carrier contrast is adopted, phi is the grating phase, and the purpose of the random change of the grating phase is to increase the difficulty of identifying the grating motion direction of a measured object; omega is the moving direction of the grating, omega is the moving speed and the moving direction of the grating,the magnitude of the numerical value represents the movement speed, the positive and negative values of the numerical value represent the movement direction, the grating movement directions corresponding to the positive value and the negative value are just opposite, and a measured person needs to judge the direction indicated by omega in the target grating movement diagram.
Referring to fig. 2, C is the grating contrast; the degree of difficulty corresponding to measurement is higher when C is smaller; the larger C, the smaller the difficulty level corresponding to the measurement.
And step S3, displaying the target grating motion diagram to the testee, and receiving the predicted grating motion direction input by the testee.
Step S4, when the predicted raster movement direction inputted by the testee is the same as the raster movement direction of the target raster movement diagram, let C1＝C1× (1-R) executing step S2 until the predicted raster movement direction input by the testee is different from the raster movement direction of the target raster movement pattern, otherwise, making C1＝C1× (1+ R) executes step S2, until the predicted raster movement direction input by the testee is the same as the raster movement direction of the target raster movement diagram, the target raster movement diagram is output, R is a ratio constant, and the value range of R is (0, 1.0).
And step S5, outputting the grating contrast of the target grating stimulus image, wherein the grating contrast of the target grating stimulus image is the motion grating perception capability of the testee.
In the specific scheme, a target grating motion diagram is displayed to a testee, the testee judges the grating motion direction and inputs a prediction grating motion direction, when the prediction grating motion direction input by the testee is the same as the grating motion direction of the target grating motion diagram, the grating contrast of the target grating motion diagram is reduced, the identification difficulty of the testee is increased, and the target grating motion diagram is output until the testee cannot identify the target grating motion diagram; when the movement direction of the tested person is incorrectly identified, the grating contrast of the target grating movement diagram is improved, the identification difficulty of the tested person is reduced, the target grating movement diagram is output until the tested person is correctly identified, R is a ratio constant and is used for controlling the test precision, and the smaller R is, the higher the test precision is.
And outputting the grating contrast of the target grating stimulus image, wherein the grating contrast of the target grating stimulus image is the motion grating perception capability of the tested person, so that the perception capability test of the tested person is completed.
In the embodiment, grating motion diagrams with different grating contrasts and different grating motion directions are displayed to a testee, the testee identifies the grating motion direction in the grating motion diagram, when the grating motion direction of the testee is identified correctly, the grating contrast of the grating motion diagram is reduced, the identification difficulty of the testee is increased, and the grating motion diagram is output until the testee cannot identify the grating motion diagram; when the grating motion direction of the measured person is not identified correctly, the grating contrast of the grating motion diagram is improved, the identification difficulty of the measured person is reduced, the grating motion diagram is output until the measured person is identified correctly, and the sensing capability corresponding to the grating motion diagram is obtained, so that the sensing capability detection of the measured person is completed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (5)

1. A method for detecting perception capability of a contrast-modulated moving sinusoidal grating is characterized by comprising the following steps:
s1, constructing a grating motion function based on the average grating brightness, the grating contrast, the grating spatial frequency, the random carrier, the carrier contrast, the grating motion speed and direction, the grating orientation and the grating phase;
s2, obtaining preset values of grating average brightness, grating space frequency, carrier contrast, grating direction and grating motion speed, obtaining a first value of grating phase, a second value of random carrier and A or B condition of grating motion directionTaking a value C in the range of grating contrast1Substituting the grating motion function into a target grating motion graph;
s3, displaying a target grating motion diagram to a tested person, and receiving a predicted grating motion direction input by the tested person;
s4, when the predicted raster movement direction input by the testee is the same as the raster movement direction of the target raster movement diagram, let C1=C1× (1-R) executing step S2 until the predicted raster movement direction input by the testee is different from the raster movement direction of the target raster movement pattern, otherwise, making C1=C1× (1+ R) executing step S2, until the predicted raster movement direction input by the testee is the same as the raster movement direction of the target raster movement diagram, outputting the target raster movement diagram, wherein R is a ratio constant;
s5, outputting the grating contrast of the target grating stimulus image, wherein the grating contrast of the target grating stimulus image is the motion grating perception capability of the testee;
step S1, specifically including:
grating motion function:
Figure DEST_PATH_IMAGE002
wherein, in the step (A),
Lmeanis the average brightness of the grating, C is the grating contrast, f is the grating spatial frequency, R (x, y) is the random carrier, CcThe carrier contrast and omega are the moving speed and direction of the grating, the value of omega represents the moving speed of the grating, the positive and negative values of the value of omega represent the moving direction of the grating, theta is the azimuth of the grating, and phi is the phase of the grating.
2. The method for detecting perceptibility of a contrast-modulated moving sinusoidal grating as claimed in claim 1, wherein in step S2, a is positive and B is negative.
3. The method for detecting perceptibility of a contrast-modulated moving sinusoidal grating as claimed in claim 1, wherein in step S2, said first value ranges from 0 to 2 pi.
4. The method for detecting perceptibility of a contrast-modulated moving sinusoidal grating as claimed in claim 3, wherein the first value takes any one of values 0 to 2 π each time step S2 is executed.
5. A method for detecting perceptibility of a contrast modulated moving sinusoidal grating according to claim 1, wherein the second value is a random value each time step S2 is executed.
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WO2011006095A1 (en) * 2009-07-09 2011-01-13 Nike International Ltd. Contrast sensitivity testing and/or training using circular contrast zones
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