CN108742501A - A kind of detection method of the spatial frequency sensing capability based on grating orientation discrimination - Google Patents
A kind of detection method of the spatial frequency sensing capability based on grating orientation discrimination Download PDFInfo
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- CN108742501A CN108742501A CN201810246732.7A CN201810246732A CN108742501A CN 108742501 A CN108742501 A CN 108742501A CN 201810246732 A CN201810246732 A CN 201810246732A CN 108742501 A CN108742501 A CN 108742501A
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Abstract
The invention discloses a kind of detection methods of the spatial frequency sensing capability based on grating orientation discrimination, 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 contrast, raster phase take preset value, grating orientation to take A or B, take grating spatial frequency F substitute into function, obtain grating stimulation figure；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 stimulation the grating orientation of figure are identical, enable F=F × (1+R) execute S2, when stimulating the grating orientation difference of figure until predicting grating orientation with grating, output target grating stimulation is schemed；Otherwise, F=F × (1-R) is enabled to execute S2, when predicting that grating orientation is identical as the grating stimulation grating orientation of figure, output target grating stimulation figure；S5, it is stimulated and is schemed according to grating, obtain testee's spatial frequency sensing capability.
Description
Technical field
The present invention relates to technical field of vision detection more particularly to a kind of spatial frequency perception based on grating orientation discrimination
The detection method of ability.
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, different from the Letter identifications such as E words on visual chart.Before
Person relies more heavily on the spatial frequency for including in stimulation and contrast information, and the latter can also rely on the space structure etc. in stimulation
Information.
Invention content
Technical problems based on background technology, the present invention propose a kind of spatial frequency based on grating orientation discrimination
The detection method of sensing capability；
A kind of detection method of spatial frequency sensing capability based on grating orientation discrimination 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 or B in grating average brightness, grating contrast
In the case of, it takes a value F to substitute into grating stimulation function in grating spatial frequency value range, obtains the stimulation of target grating
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 F=
F × (1+R) executes step S2, and the grating orientation of figure is stimulated not with target grating until the prediction grating orientation of testee's input
When identical, the target grating stimulation figure is exported；Otherwise, F=F × (1-R) is enabled to execute 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 spatial frequency of S5, output target grating stimulation figure, the grating spatial frequency of the target grating stimulation figure
The as spatial frequency 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 by the grating different to testee's display raster spatial frequency, orientation is different
Grating orientation in grating stimulation figure is identified, when measured's orientation recognition is correct, improves the grating of grating stimulation figure
Spatial frequency increases the identification difficulty of measured, when measured can not identify, exports the grating stimulation figure；When tested
When person's orientation recognition is incorrect, the grating spatial frequency of grating stimulation figure is reduced, the identification difficulty of measured is reduced, until tested
When person's identification is correct, the grating stimulation figure is exported, then obtain spatial frequency corresponding with grating stimulation figure, to complete to quilt
The test of survey person's spatial frequency sensing capability, this method is simple and convenient, and accuracy rate is high, can automate the vision feelings according to measured
Condition is adjusted, highly practical, is used manpower and material resources sparingly.
Description of the drawings
Fig. 1 is a kind of stream of the detection method of the spatial frequency sensing capability based on grating orientation discrimination proposed by the present invention
Journey schematic diagram；
Fig. 2 is the grating stimulation figure that grating of the present invention stimulates different grating spatial frequencies 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 spatial frequency sensing capability based on grating orientation discrimination proposed by the present invention,
Including：
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 that the first value, grating orientation is taken to take A in grating average brightness, grating contrast
Or in the case of B, takes a value F to substitute into grating stimulation function in grating spatial frequency value range, obtain target grating
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, each
When executing 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；C be grating contrast, adjusting range be 0.75-1.00, adjustment need to be completed before measuring, after adjustment
It cannot be adjusted again in entire measurement process, after the completion of one-shot measurement, can adjust again measure next time before；
In Fig. 2, grating spatial frequency f from left to right gradually increases, and f is bigger, and it is bigger to measure corresponding grade of difficulty；F is got over
It is small, 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,
F=F × (1+R) is enabled to execute 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, F=F × (1-R) is enabled to execute 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
Than numerical constant, the value range of R is (0,1.0).
Step S5, the grating spatial frequency of output target grating stimulation figure, the grating space of the target grating stimulation figure
Frequency is the spatial frequency sensing capability of testee.
In concrete scheme, to testee's display raster spatial frequency be F target grating stimulate figure, testee into
Line raster orientation judges 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, improve grating stimulation figure grating spatial frequency, increase the identification difficulty of measured, until measured
When can not identifying, the grating stimulation figure is exported；When measured's orientation recognition is incorrect, the grating for reducing grating stimulation figure is empty
Between frequency, reduce the identification difficulty of measured, when measured's identification is correct, export the grating stimulation figure, wherein R is
Than numerical constant, for controlling measuring accuracy, R is smaller, and measuring accuracy is higher.
The grating spatial frequency of target grating stimulation figure is exported, the grating spatial frequency of the target grating stimulation figure is
The spatial frequency sensing capability of testee, to complete the spatial frequency sensing capability test to measured.
Present embodiment stimulates figure, quilt by the grating different to testee's display raster spatial frequency, orientation is different
The grating orientation in grating stimulation figure is identified in survey person, when measured's orientation recognition is correct, improves grating stimulation figure
Grating spatial frequency increases the identification difficulty of measured, when measured can not identify, exports the grating stimulation figure；When
When measured's orientation recognition is incorrect, the grating spatial frequency of grating stimulation figure is reduced, the identification difficulty of measured is reduced, until
When measured's identification is correct, the grating stimulation figure is exported, then obtain spatial frequency corresponding with grating stimulation figure, to complete
Test to measured's spatial frequency sensing capability, this method is simple and convenient, and accuracy rate is high, can automate regarding according to measured
Feel that situation is adjusted, 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 spatial frequency sensing capability based on grating orientation discrimination, 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 the feelings of A or B in grating average brightness, grating contrast
Under condition, takes a value F to substitute into grating stimulation function in grating spatial frequency value range, obtain 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 F=F ×
(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, enable F=F × (1-R) execute step S2, until testee input it is pre-
When survey grating orientation stimulates the grating orientation of figure identical with target grating, the target grating stimulation figure is exported, R is that ratio is normal
Number；
The grating spatial frequency of S5, output target grating stimulation figure, the grating spatial frequency of the target grating stimulation figure are
The spatial frequency sensing capability of testee.
2. the detection method of the spatial frequency sensing capability according to claim 1 based on grating orientation discrimination, feature
It is, step S1 is specifically included：
Grating stimulates function l (x, y)=Lmean× { 1+C × sin { 2 π [f (ycos9-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 spatial frequency sensing capability according to claim 1 based on grating orientation discrimination, feature
It is, 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 spatial frequency sensing capability according to claim 1 based on grating orientation discrimination, feature
It is, in step S2, the value range of first value is 0 to 2 π.
5. the detection method of the spatial frequency sensing capability according to claim 4 based on grating orientation discrimination, feature
It is, when executing step S2 every time, the first value takes any of 0 to 2 π values.
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Citations (3)
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| CN101647694A (en) * | 2009-09-11 | 2010-02-17 | 广州视景医疗软件有限公司 | Method and system for inspecting visual contrast sensitivity based on network |
| CN107224262A (en) * | 2016-03-23 | 2017-10-03 | 庄臣及庄臣视力保护公司 | System and method for quickly measuring visual contrast sensitivity function |
| CN107550451A (en) * | 2016-06-30 | 2018-01-09 | 中国科学院心理研究所 | A kind of method and system of visual field function nature objective evaluation |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101647694A (en) * | 2009-09-11 | 2010-02-17 | 广州视景医疗软件有限公司 | Method and system for inspecting visual contrast sensitivity based on network |
| CN107224262A (en) * | 2016-03-23 | 2017-10-03 | 庄臣及庄臣视力保护公司 | System and method for quickly measuring visual contrast sensitivity function |
| CN107550451A (en) * | 2016-06-30 | 2018-01-09 | 中国科学院心理研究所 | A kind of method and system of visual field function nature objective evaluation |
Non-Patent Citations (2)
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| 徐国祥: "《激光医学》", 31 December 1998 * |
| 徐庆: "《眼的光学成像原理》", 31 December 2012 * |
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