CN108742502B - Detection method for brightness-modulated motion sinusoidal grating perception capability - Google Patents
Detection method for brightness-modulated motion sinusoidal grating perception capability Download PDFInfo
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Abstract
The invention discloses a detection method of brightness modulated motion sinusoidal grating perception capability, which comprises the following steps: constructing a grating motion function based on the average grating brightness, the grating contrast, the grating spatial frequency, the grating motion speed and direction, the grating orientation and the grating phase; taking grating contrast C when the grating phase takes a first value, the grating motion direction takes A or B, and other values are fixed valueszSubstituting 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 Cz＝CzSubstituting the x (1-R) into a grating motion function until the input grating motion direction is different from the grating motion direction of the grating motion diagram, and outputting a target grating motion diagram; otherwise, Cz＝CzSubstituting the x (1+ R) into a grating motion function until the input grating motion direction is the same as the grating motion direction of a grating motion image, and outputting the grating motion image; and obtaining the perception capability of the measured person according to the grating contrast of the grating motion diagram.
Description
Technical Field
The invention relates to the technical field of visual detection, in particular to a detection method for the perception capability of a brightness-modulated moving 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 for the perception capability of a brightness-modulated motion sinusoidal grating;
the invention provides a detection method of brightness modulated motion sinusoidal grating perception capability, 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 grating motion speed and direction, the grating orientation and the grating phase;
s2, taking a preset value in the average brightness, spatial frequency, orientation and motion speed of the grating, taking a first value in the phase of the grating and taking A or B in the motion direction of the grating, and taking a value C in the contrast value range of the gratingzSubstituting 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 Cz＝CzX (1-R) executing step S2, when the predicted raster movement direction input by the testee is not the same as the raster movement direction of the target raster movement diagram, outputting the target raster movement diagram; otherwise, let Cz＝CzX (1+ R) executing step S2, until the predicted raster motion direction input by the testee is the same as the raster motion direction of the target raster motion diagram, outputting the target raster motion diagram, where 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+C×sin{2π[f(ycosθ-xsinθ)+ωt]+Φ}}，
Wherein L ismeanThe average brightness of the grating, the contrast of the grating, the spatial frequency of the grating, the movement speed and the movement direction of the grating are represented by f, the movement speed of the grating is represented by the magnitude of the omega, the movement direction of the grating is represented by the positive and negative values of the omega, the orientation of the grating is represented by theta, and the phase of the grating is represented by phi.
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 value within the value range 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 detection of the motion grating sensing capability of the measured person is completed.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting the perception capability of a brightness-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 the perception capability of a brightness 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 grating motion speed and direction, the grating orientation, and the grating phase, which specifically includes:
grating motion function: l (x, y) ═ Lmean×{1+C×sin{2π[f(ycosθ-xsinθ)+ωt]+Φ}}，
Wherein L ismeanThe average grating brightness, the grating contrast, the grating spatial frequency, the grating motion direction, the grating azimuth and the grating phase are shown in the specification.
Step S2, average brightness, spatial frequency and rasterThe azimuth and the grating motion speed are preset values, the grating phase is a first value, and the grating motion direction is A or B, a value C is taken in the grating contrast value rangezAnd substituting the obtained first value into the 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, and the first value is any value in the value range when the step S2 is executed each time.
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.; phi is a grating phase, and the grating phase randomly changes in the value range of the grating phase in each measurement process, so that the difficulty of identifying the grating motion direction of a measured object is increased; omega is the grating movement speed and direction, the value represents the movement speed, the positive and negative values represent the movement direction, the grating movement directions corresponding to the positive and negative values are just opposite, and a measured person needs to judge the direction represented 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 Cz＝CzX (1-R) executing step S2, when the predicted raster movement direction input by the testee is not the same as the raster movement direction of the target raster movement diagram, outputting the target raster movement diagram; otherwise, let Cz＝CzX (1+ R) step S2 is executed until the tester inputs the predicted raster motion direction and the targetOutputting the target grating motion image when the grating motion directions of the target grating motion image are the same, wherein R is a ratio constant;
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 detection of the motion grating sensing capability 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 the perceptibility of a brightness 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 grating motion speed and direction, the grating orientation and the grating phase;
s2, taking a preset value in the average brightness, spatial frequency, orientation and motion speed of the grating, taking a first value in the phase of the grating and taking A or B in the motion direction of the grating, and taking a value C in the contrast value range of the gratingzSubstituting 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 Cz＝CzX (1-R) executing step S2, when the predicted raster movement direction input by the testee is not the same as the raster movement direction of the target raster movement diagram, outputting the target raster movement diagram; otherwise, let Cz＝CzX (1+ R) executing step S2, until the predicted raster motion direction input by the testee is the same as the raster motion direction of the target raster motion diagram, outputting the target raster motion diagram, where 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.
2. The method for detecting perceptual ability of a luminance-modulated moving sinusoidal grating as claimed in claim 1, wherein the step S1 specifically includes:
grating motion function: l (x, y) ═ Lmean×{1+C×sin{2π[f(ycosθ-xsinθ)+ωt]+ Φ } }, where L ismeanThe average brightness of the grating, the contrast of the grating, the spatial frequency of the grating, the movement speed and the movement direction of the grating are represented by f, the movement speed of the grating is represented by the magnitude of the omega, the movement direction of the grating is represented by the positive and negative values of the omega, the orientation of the grating is represented by theta, and the phase of the grating is represented by phi.
3. The method for detecting perceptual capability of a luminance-modulated moving sinusoidal grating as claimed in claim 1, wherein a is a positive value and B is a negative value in step S2.
4. The method for detecting perceptual capability of a luminance-modulated moving sinusoidal grating as claimed in claim 1, wherein in step S2, the first value ranges from 0 to 2 pi.
5. The method for detecting perceptual capability of a luminance-modulated moving sinusoidal grating as claimed in claim 4, wherein the first value takes any value within a range of values each time step S2 is executed.
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