CN108742499A - A kind of detection method of the sinusoidal grating sensing capability based on intensification modulation - Google Patents
A kind of detection method of the sinusoidal grating sensing capability based on intensification modulation Download PDFInfo
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Abstract
The detection method for the sinusoidal grating sensing capability based on intensification modulation that the invention discloses a kind of, including：S1, function is stimulated based on grating average brightness, grating contrast, grating spatial frequency, grating orientation and raster phase structure grating；S2, when grating average brightness, grating spatial frequency, raster phase take preset value, grating orientation takes A or B, take grating contrast C1Function is substituted into, grating stimulation figure is obtained；S3, it stimulates and schemes to testee's display raster, receive testee's input prediction grating orientation；S4, when predicting that grating orientation and grating stimulate the grating orientation of figure identical, enable C1=C1× (1-R) executes S2, when predicting grating orientation and the grating orientation difference of grating stimulation figure, output grating stimulation figure；Otherwise, C is enabled1=C1× (1+R) executes S2, when predicting that grating orientation is identical as the target grating stimulation grating orientation of figure, output target grating stimulation figure；The grating contrast of S5, output grating stimulation figure, obtain the grating sensing capability of testee.
Description
Technical field
The present invention relates to technical field of vision detection more particularly to a kind of sinusoidal grating sensing capabilities based on intensification modulation
Detection method.
Background technology
Sinusoidal grating is a kind of grating of specific type, is collectively constituted by carrier and modulated signal.Carrier can be blank or
The forms such as random noise, modulated signal are sinusoidal grating.Grating stimulation is applied to for the detection of cortex visual performance, with eyesight
The Letter identifications such as the E words on table are different.The former relies more heavily on the spatial frequency for including in stimulation and contrast information, and the latter
The information such as space structure in stimulation can also be relied on.
The sensing capability that human individual stimulates sinusoidal grating is not quite similar.Under normal circumstances, sinusoidal grating contrast is got over
Small, people is just more difficult to Sinusoidal grating discrimination and perception.Therefore, the method for change sinusoidal grating contrast, tester can be passed through
The sinusoidal grating sensing capability of class individual.
Invention content
Technical problems based on background technology, the present invention propose a kind of sinusoidal grating perception based on intensification modulation
The detection method of ability；
A kind of detection method of sinusoidal grating sensing capability based on intensification modulation proposed by the present invention, including：
S1, light is built based on grating average brightness, grating contrast, grating spatial frequency, grating orientation and raster phase
Grid stimulate function；
S2, take preset value, raster phase that the first value, grating orientation is taken to take A in grating average brightness and grating spatial frequency
Or in the case of B, a value C is taken in grating contrast value range1It substitutes into grating stimulation function, obtains target grating thorn
Swash figure；
S3, target grating stimulation figure is shown to testee, receive the prediction grating orientation of testee's input；
S4, when prediction grating orientation and the target grating of testee's input stimulate the grating orientation of figure identical, enable C1
=C1× (1-R) executes step S2, until the grating side in the prediction grating orientation of testee's input and target grating stimulation figure
When position differs, the target grating stimulation figure is exported；Otherwise, C is enabled1=C1× (1+R) executes step S2, until testee
When the prediction grating orientation of input is identical as the target grating stimulation grating orientation of figure, the target grating stimulation figure is exported, R is
Compare numerical constant；
The grating contrast of S5, output target grating stimulation figure, the grating contrast of the target grating stimulation figure are
The grating sensing capability of testee.
Preferably, step S1 is specifically included：
Grating stimulates function l (x, y)=Lmean× { 1+C × sin { 2 π [f (ycos θ-xsin θ)]+Φ } }, wherein Lmean
For grating average brightness, C be grating contrast, f is grating spatial frequency, θ is grating orientation, Ф is raster phase.
Preferably, in step S2, when the A is 0, B is pi/2；When A is π/4, B is 3 π/4.
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 of 0 to 2 π values.
The present invention stimulates figure, measured couple by the grating different to testee's display raster contrast, orientation is different
Grating orientation in grating stimulation figure is identified, and when measured's orientation recognition is correct, reduces the grating pair of grating stimulation figure
Than degree, increase the identification difficulty of measured, when measured can not identify, output grating stimulation figure；When measured orientation is known
When not incorrect, the grating contrast of grating stimulation figure is improved, the identification difficulty of measured is reduced, until measured's identification is correct
When, output grating stimulation figure, then grating sensing capability corresponding with grating stimulation figure is obtained, to complete the grating to measured
Sensing capability is tested, and this method is simple and convenient, can automatically according to measured identification situation into line raster setting contrast, it is practical
Property it is strong, accuracy rate is high, easy to control, for the test of doctor's traditional operation, more automates, uses manpower and material resources sparingly.
Description of the drawings
Fig. 1 is that a kind of flow of the detection method of the sinusoidal grating sensing capability based on intensification modulation proposed by the present invention is shown
It is intended to；
Fig. 2 is the grating stimulation figure that grating of the present invention stimulates different grating contrasts in function；
Fig. 3 is grating stimulation figure when grating orientation is pi/2 in grating stimulation function of the present invention；
Fig. 4 is grating stimulation figure when grating orientation is 0 in grating stimulation function of the present invention；
Fig. 5 is grating stimulation figure when grating orientation is π/4 in grating stimulation function of the present invention；
Fig. 6 is grating stimulation figure when grating orientation is 3 π/4 in grating stimulation function of the present invention；
Fig. 7 is the grating stimulation figure that grating of the present invention stimulates different raster phases in function.
Specific implementation mode
Referring to Fig.1, the detection method of a kind of sinusoidal grating sensing capability based on intensification modulation proposed by the present invention, packet
It includes：
Step S1 is based on grating average brightness, grating contrast, grating spatial frequency, grating orientation and raster phase structure
Grating stimulation function is built, is specifically included：
Grating stimulates function l (x, y)=Lmean× { 1+C × sin { 2 π [f (ycos θ-xsin θ)]+Φ } }, wherein Lmean
For grating average brightness, C be grating contrast, f is grating spatial frequency, θ is grating orientation, Ф is raster phase.
Step S2 takes preset value, raster phase to take the first value, grating orientation in grating average brightness and grating spatial frequency
In the case of taking A or B, a value C is taken in grating contrast value range1It substitutes into grating stimulation function, obtains target light
Grid stimulation figure, when the A is 0, B is pi/2；When A is π/4, B is 3 π/4, and the value range of first value is 0 to 2 π, every
When secondary execution step S2, the first value takes any of 0 to 2 π values.
With reference to Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, in concrete scheme, LmeanIt is practical to measure for grating average brightness
When can be in (0.0-500.0cd/m2) between arbitrarily adjust.But adjustment need to be completed before measuring, in entire measurement process after adjustment
In cannot adjust again；F is grating spatial frequency, need to usually determine a numerical value.After determination, f in entire measurement process not
It can change, after the completion of one-shot measurement, carry out can be adjusted to new numerical value measure next time before.
Such as Fig. 2, grating contrast C is from left to right gradually reduced, and C is smaller, and it is bigger to measure corresponding grade of difficulty；C is bigger,
It is smaller to measure corresponding grade of difficulty.
Such as Fig. 3 to Fig. 6, in test process, θ usually selected two values (for example 0 and pi/2, π/4 and 3 π/4) go out each time
The θ that existing target grating stimulation figure includes randomly chooses one from two values, and user needs to judge target grating stimulation figure packet
Which value the θ contained is.
If Fig. 7, Ф are raster phase, during the test, can at random change in value range, in order to right
Increase the difficulty that measured's grating orientation judges.
Step S3 shows target grating stimulation figure to testee, receives the prediction grating orientation of testee's input.
Step S4, when the prediction grating orientation of testee's input is identical as the target grating stimulation grating orientation of figure,
Enable C1=C1× (1-R) executes step S2, until the grating in the prediction grating orientation of testee's input and target grating stimulation figure
When orientation differs, the target grating stimulation figure is exported；Otherwise, C is enabled1=C1× (1+R) executes step S2, until tested
When the prediction grating orientation of person's input is identical as the target grating stimulation grating orientation of figure, the target grating stimulation figure, R are exported
It is (0,1.0) for the value range than numerical constant, R.
Step S5, the grating contrast of output target grating stimulation figure, the grating contrast of the target grating stimulation figure
The as grating sensing capability of testee.
It is C to testee's display raster contrast in concrete scheme1Target grating stimulation figure, testee into
Line raster orientation recognition and input prediction grating orientation, when the prediction grating orientation of testee's input and the stimulation of target grating are schemed
Grating orientation it is identical when, reduce grating stimulation figure grating contrast, increase the identification difficulty of measured, until measured know
When not going out, output grating stimulation figure；When measured's orientation recognition is incorrect, the grating contrast of grating stimulation figure is improved,
The identification difficulty for reducing measured, when measured's identification is correct, output grating stimulation figure, wherein R is to be used than numerical constant
In control 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 grating sensing capability of examination person, to complete the sensing capability test to measured.
Present embodiment stimulates figure by the grating different to testee's display raster contrast, orientation is different, is tested
The grating orientation in grating stimulation figure is identified in person, when measured's orientation recognition is correct, reduces the light of grating stimulation figure
Grid contrast increases the identification difficulty of measured, when measured can not identify, output grating stimulation figure；When measured side
When position identification is incorrect, the grating contrast of grating stimulation figure is improved, the identification difficulty of measured is reduced, until measured identifies
When correct, output grating stimulation figure, then grating sensing capability corresponding with grating stimulation figure is obtained, to complete to measured's
Grating sensing capability is tested, and this method is simple and convenient, can automatically according to measured identification situation into line raster setting contrast,
Highly practical, accuracy rate is high, easy to control, for the test of doctor's traditional operation, more automates, 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 sinusoidal grating sensing capability based on intensification modulation, which is characterized in that including：
S1, it is pierced based on grating average brightness, grating contrast, grating spatial frequency, grating orientation and raster phase structure grating
Swash function；
S2, take preset value, raster phase that the first value, grating orientation is taken to take A's or B in grating average brightness and grating spatial frequency
In the case of, a value C is taken in grating contrast value range1It substitutes into grating stimulation function, obtains target grating stimulation figure；
S3, target grating stimulation figure is shown to testee, receive the prediction grating orientation of testee's input；
S4, when prediction grating orientation and the target grating of testee's input stimulate the grating orientation of figure identical, enable C1=C1×
(1-R) executes step S2, until the grating orientation not phase of prediction grating orientation and target grating the stimulation figure of testee's input
Meanwhile exporting the target grating stimulation figure；Otherwise, C is enabled1=C1× (1+R) executes step S2, until testee's input
When predicting that grating orientation is identical as the target grating stimulation grating orientation of figure, the target grating stimulation figure is exported, R is that ratio is normal
Number；
The grating contrast of S5, output target grating stimulation figure, the grating contrast of the target grating stimulation figure is tested
The grating sensing capability of examination person.
2. the detection method of the sinusoidal grating sensing capability according to claim 1 based on intensification modulation, which is characterized in that
Step S1, specifically includes：
Grating stimulates function l (x, y)=Lmean× { 1+C × sin { 2 π [f (ycos θ-xsin θ)]+Φ } }, wherein LmeanFor light
Grid average brightness, C are grating contrast, f is grating spatial frequency, θ is grating orientation, Ф is raster phase.
3. the detection method of the sinusoidal grating sensing capability according to claim 1 based on intensification modulation, which is characterized in that
In step S2, when the A is 0, B is pi/2；When A is π/4, B is 3 π/4.
4. the detection method of the sinusoidal grating sensing capability according to claim 1 based on intensification modulation, 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 sinusoidal grating sensing capability according to claim 4 based on intensification modulation, which is characterized in that
When executing step S2 every time, the first value takes any of 0 to 2 π values.
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