CN108174190A - The test method and device of a kind of modulation transfer function test pattern, MTF - Google Patents
The test method and device of a kind of modulation transfer function test pattern, MTF Download PDFInfo
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- CN108174190A CN108174190A CN201711464021.9A CN201711464021A CN108174190A CN 108174190 A CN108174190 A CN 108174190A CN 201711464021 A CN201711464021 A CN 201711464021A CN 108174190 A CN108174190 A CN 108174190A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
Abstract
The invention discloses the test methods and device of a kind of modulation transfer function test pattern, MTF.The MTF test patterns include：At least one first test color lumps, at least one second test color lumps, at least one ater test color lumps and at least one pure white test color lumps；First test color lumps include distributing alternately in the horizontal direction, the blackstreak that quantity is equal and white stripes；Second test color lumps include vertically distributing alternately, the blackstreak that quantity is equal and white stripes；The distance at the center of ater test color lumps to MTF test patterns center is equal with the distance at the center of pure white test color lumps to MTF test patterns center.As it can be seen that the present invention, when showing screen brightness change, since the difference and the difference of the variable quantity of black and white color lump gray value of the variable quantity of black and white strip gray value are approximately the same and smaller, mtf value will not change with the change of display screen intensity.
Description
Technical field
The present invention relates to optical technical field, more particularly to a kind of test of modulation transfer function test pattern, MTF
Method and device.
Background technology
The modulation degree of lens imaging is known as modulation degree transmission function (Modulation with the function of spatial frequency variation
Transfer Function, MTF), it can be calculated by test pattern and obtain MTF, for evaluating the clear of virtual reality device
Degree.
In order to simulate the clarity of image that virtual reality device user's actual observation arrives, as shown in Figure 1, eyeglass 13 is consolidated
It is scheduled on 14 in lens supports, the connection of 14 other end of lens supports shows screen 16, and test pattern 15 is projected on display screen 16；
Image collecting device 11 is mounted on carrying platform 12, image collecting device 11 is through on 13 filmed display screen 16 of eyeglass
Test pattern 15 obtains the image of test pattern 15.
The structures of existing MTF test patterns is as shown in Fig. 2, including at least one first test color lumps 21 and at least one
Second test color lumps 22, the first test color lumps 21 include distributing alternately in the horizontal direction, the blackstreak that quantity is equal and white
Striped；Second test color lumps 22 include vertically distributing alternately, the blackstreak that quantity is equal and white stripes, use this
During the test pattern that kind distributes alternately with black and white strip, show the brightness of screen 16 to blackstreak in 15 image of test pattern
Had an impact with the gray value of white stripes, the mtf value being calculated caused to have differences, can not accurate evaluation virtual reality set
Standby clarity.
Specifically, according to the mtf value in equation below calculated level direction：
Wherein, the corresponding image-region of the first test color lumps of selection target, needle from the image of the test pattern of acquisition 15
Average gray, I are asked for the image-regionmaxGray scale for each pixel for being more than average gray in the image-region
The average value of value, i.e., the average value of all white stripes gray values, IminTo be less than each of average gray in the image-region
The average value of the gray value of pixel, i.e., the average value of all blackstreak gray values.
When the brightness for showing screen changes, above-mentioned formula is converted into：
Wherein, Δ ImaxFor the changing value of all white stripes gray values, Δ IminChange for all blackstreak gray values
Change value, image-region corresponding for same first test color lumps, variable quantity and the blackstreak gray scale of white stripes gray value
Approximately the same (the Δ I of variable quantity of valuemax≈ΔImin)；By formula calculating it is found that when the brightness for showing screen becomes larger, mtf value
It reduces, when the brightness for showing screen becomes small, mtf value raising.
Therefore, for same product, when showing the brightness change of screen, corresponding mtf value changes, therefore can not
The accurately clarity of evaluation product.
Invention content
The value of MTF caused to change in order to which the gray value for solving the display screen of the prior art changes, lead to nothing
The problem of clarity of method accurate evaluation virtual reality device, the present invention provides a kind of modulation transfer function test pattern,
The test method and device of MTF.
One embodiment of the present of invention provides a kind of modulation transfer function test pattern, including：
At least one first test color lumps, at least one second test color lumps, at least one ater test color lumps and extremely
Few pure white test color lumps；
First test color lumps include distributing alternately in the horizontal direction, the blackstreak that quantity is equal and white stripes；
Second test color lumps include vertically distributing alternately, the blackstreak that quantity is equal and white stripes；
The center of the center of ater test color lumps to the distance and pure white test color lumps at MTF test patterns center is arrived
The distance at MTF test patterns center is equal.
Preferably, the quantity of ater test color lumps is equal with the quantity of pure white test color lumps.
Preferably, it is mutually non-conterminous along the first test color lumps of horizontal direction of MTF test patterns and the second test color lumps；
It is mutually non-conterminous along the first test color lumps of vertical direction of MTF test patterns and the second test color lumps.
Preferably, each test color lumps are the integer more than or equal to 2 in M × Metzler matrix distribution, M.
According to another aspect of the present invention, a kind of MTF test methods based on above-mentioned test pattern are provided, including：
Through the image of the MTF test patterns of eyeglass acquired projections on the display screen, the center of MTF test patterns is located at
On the optical axis of eyeglass；
Corresponding first image-region of the first test color lumps of selection target, target second from the image of MTF test patterns
Corresponding second image-region of test color lumps, the corresponding third image-region of target ater test color lumps and target pure white are surveyed
Try corresponding 4th image-region of color lump；
It is obtained according to the gray value of the gray value of the first image-region, the gray value of third image-region and the 4th image-region
Take the mtf value of horizontal direction；
It is obtained according to the gray value of the gray value of the second image-region, the gray value of third image-region and the 4th image-region
Take the mtf value of vertical direction.
Preferably, according to the gray value of the first image-region, the gray value of third image-region and the 4th image-region
Gray value obtains the mtf value of horizontal direction, including：
The mtf value of horizontal direction is obtained according to equation below：
Wherein, MTFh1Represent the mtf value of horizontal direction；ImaxhRepresent in the first image-region that gray scale is most in each row pixel
The average value being worth greatly, IminhRepresent the average value of minimum gray value in each row pixel in the first image-region；IwmaxhRepresent the
In four image-regions in each row pixel gray scale maximum value average value, IBminhIt represents in third image-region in each row pixel
The average value of minimum gray value.
Preferably, according to the gray value of the second image-region, the gray value of third image-region and the 4th image-region
Gray value obtains the mtf value of vertical direction, including：
The mtf value of vertical direction is obtained according to equation below：
Wherein, MTFv1Represent the mtf value of vertical direction；ImaxvRepresent in the second image-region that gray scale is most in each row pixel
The average value being worth greatly, IminvRepresent the average value of minimum gray value in each row pixel in the second image-region；IwmaxvRepresent the
In four image-regions in each row pixel gray scale maximum value average value, IBminvIt represents in third image-region in each row pixel
The average value of minimum gray value.
In accordance with a further aspect of the present invention, a kind of MTF test devices based on above-mentioned test pattern are provided, including：
Image acquisition units, for the image of the MTF test patterns through eyeglass acquired projections on the display screen；
Image-region selecting unit, for from the image of MTF test patterns the first test color lumps of selection target it is corresponding
Corresponding second image-region of first image-region, the second test color lumps of target, the corresponding third of target ater test color lumps
Image-region and corresponding 4th image-region of target pure white test color lumps；
Horizontal direction mtf value acquiring unit, for according to the first image-region gray value, the gray scale of third image-region
The gray value of value and the 4th image-region obtains the mtf value of horizontal direction；
Vertical direction mtf value acquiring unit, for according to the second image-region gray value, the gray scale of third image-region
The gray value of value and the 4th image-region obtains the mtf value of vertical direction.
Preferably, horizontal direction mtf value acquiring unit is specifically used for：
The mtf value of horizontal direction is obtained according to equation below：
Wherein, MTFh1Represent the mtf value of horizontal direction；ImaxhRepresent in the first image-region that gray scale is most in each row pixel
The average value being worth greatly, IminhRepresent the average value of minimum gray value in each row pixel in the first image-region；IwmaxhRepresent the
In four image-regions in each row pixel gray scale maximum value average value, IBminhIt represents in third image-region in each row pixel
The average value of minimum gray value；
Vertical direction mtf value acquiring unit is specifically used for：
The mtf value of vertical direction is obtained according to equation below：
Wherein, MTFv1Represent the mtf value of vertical direction；ImaxvRepresent in the second image-region that gray scale is most in each row pixel
The average value being worth greatly, IminvRepresent the average value of minimum gray value in each row pixel in the second image-region；IWmaxvRepresent the
In four image-regions in each row pixel gray scale maximum value average value, IBminvIt represents in third image-region in each row pixel
The average value of minimum gray value.
An alternative embodiment of the invention provides a kind of electronic equipment, and electronic equipment includes memory and processor, storage
It is communicated and connected by internal bus between device and processor, memory is stored with the program instruction that can be executed by processor, journey
Sequence instruction can realize the test method of above-mentioned MTF when being executed by processor.
An alternative embodiment of the invention provides a kind of computer readable storage medium, computer-readable recording medium storage
Computer instruction, computer instruction make the test method of the above-mentioned MTF of computer execution.
The solution have the advantages that test color of the present invention by the increase ater in existing MTF test patterns
Block and lily test color lumps, the distance at center to the MTF test patterns center of ater test color lumps are tested with pure white
The distance at the center of color lump to MTF test patterns center is equal.So as to according to horizontal direction black and white strip test color lumps
The gray value of corresponding image-region, the gray value, pure with the corresponding image-region of vertical direction black and white strip test color lumps
The gray value of the corresponding image-region of black test color lump and the gray value of the corresponding image-region of pure white test color lumps obtain
Mtf value, when showing screen brightness change, due to the difference of the variable quantity of black and white strip gray value and the change of black and white color lump gray value
The difference of change amount is approximately the same and smaller, and mtf value will not change with the change of display screen intensity.
Description of the drawings
Fig. 1 is MTF test philosophy figures；
Fig. 2 is the structure diagram of existing MTF test patterns；
Fig. 3 is the structure diagram of the MTF test patterns of one embodiment of the invention；
Fig. 4 is the structure diagram of the MTF test patterns of another embodiment of the present invention；
Fig. 5 is the flow diagram of the MTF test methods of one embodiment of the invention；
Fig. 6 is the structure diagram of the MTF test devices of one embodiment of the invention；
Fig. 7 is the structure diagram of the electronic equipment of one embodiment of the invention.
Specific embodiment
The technical issues of in order to solve to propose in background technology, present inventor are expected in existing MTF test charts
Increase the test color lumps of ater and lily test color lumps, the center of ater test color lumps to MTF test patterns in card
The distance at center is equal with the distance at center to the MTF test patterns center of pure white test color lumps.So as to according to water
Square to the corresponding image-region of black and white strip test color lumps gray value, have vertical direction black and white strip test color lumps correspond to
The gray value of image-region, the gray value of the corresponding image-region of ater test color lumps and pure white test color lumps it is corresponding
The gray value of image-region obtains mtf value, when showing screen brightness change, due to the difference of the variable quantity of black and white strip gray value
Approximately the same and smaller with the difference of the variable quantity of black and white color lump gray value value, mtf value will not be with the change of display screen intensity
And change.
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 3 is the structure diagram of the MTF test patterns of one embodiment of the invention.As shown in figure 3, the embodiment of the present invention
MTF test patterns include：
At least one first test color lumps 31, at least one second test color lumps 32, at least one ater test color lumps
33 and at least one pure white test color lumps 34；
First test color lumps 31 include distributing alternately in the horizontal direction, the blackstreak that quantity is equal and white stripes；
Second test color lumps 32 include vertically distributing alternately, the blackstreak that quantity is equal and white stripes；
The center of ater test color lumps 33 is to the distance at MTF test patterns center and the center of pure white test color lumps 34
Distance to MTF test patterns center is equal.
The test of pure white and ater is set to survey block as benchmark test color lump, passes through striped color lump and pure color color lump
Comparison obtains the mtf value of image, so as to make result more accurate.The MTF of lens imaging is obtained using this kind of MTF test pattern
Value, the acquisition result of mtf value are：
In formula, ImaxFor in 32 each sampling area of the first test color lumps 31 and the second test color lumps gray scale maximum value it is flat
Mean value；IminAverage value for minimum gray value in 32 each sampling area of the first test color lumps 31 and the second test color lumps；IWmax
Average value for gray scale maximum value in pure white 34 each sampling area of test color lumps；IBminIt is each sampled for black test color lumps 33
The average value of gray scale maximum value in region.
As shown in Figure 1, in the gray value for obtaining test color lumps, each test color lumps are divided into multiple sampling areas and are carried out
Gray value samples.Gray scale maximum value and minimum gray value are determined in each sampling area, seeks the gray scale of all sampling areas
The average value of maximum value and minimum gray value.The Principle of Statistics that determines the use of of sampling area is determined, such as is surveyed in striped
It needs to ensure that existing informal voucher line has black streaking again in examination color lump, makes data that there is diversity as possible, so as to ensure result of calculation
Reliability.Specifically, using the region of first pixel composition on 31 vertical direction of the first test color lumps as the first test color
First sampling area of block 31, second sampling area of the region that second pixel point forms as the first test color lumps 31, with
Such data sampling for promoting row gray value；The region of first pixel composition in second test color lumps, 32 horizontal direction is made
For the first sampling area of the second test color lumps 32, the region of second pixel point composition as the second test color lumps 32 second
Sampling area, and so on carry out gray value data sampling.
When the brightness for showing screen changes, the calculation of mtf value becomes：
In formula, Δ ImaxGray-value variation amount for white stripes；ΔIminGray-value variation amount for blackstreak；Δ
IWmaxGray-value variation amount for pure white colour examining color lump；ΔIBminGray-value variation amount for ater test color lumps 33.Due to
ΔImaxWith Δ ImaxThe color lump of striped is belonged to, therefore white stripes and the gray-value variation amount of blackstreak are approximately the same, i.e.,
ΔImax≈ΔImin；ΔIWmaxWith Δ IBminPure color test color lumps are belonged to, gray-value variation amount is also approximately the same, i.e. Δ IWmax
≈ΔIBmin.Thus, formula (2) is approximately equal to formula (1), even if screen intensity changes, mtf value is also constant, so as to
The clarity of accurate evaluation image.
It is learnt by the MTF test philosophy figures of Fig. 1, test pattern is needed mounted on the center of eyeglass, and in test pattern
The optical axis coincidence of the heart and eyeglass, so as to ensure the picture quality of the projection of test pattern on the display screen.Black and white strip is set
The different test color lumps in direction, to obtain the changing rule of the gray value on different directions.Additionally, due to center of lens and eyeglass
The image quality at edge is different, in order to ensure the variable quantity of 33 gray value of ater test color lumps and pure white test color lumps 34
The variable quantity approximately equal of gray value, the distance at the two distance test graph card center should be equal, makes on MTF test patterns in distance
The image quality of the identical point of the heart is identical, so as to ensure the accuracy of MTF tests.
Preferably, the quantity of ater test color lumps 33 is equal with the quantity of pure white test color lumps 34.Calculating mtf value
When, it needs to calculate the gray value of the test color lumps of different colours respectively, keeps the quantity and pure white of ater test color lumps 33
The quantity of test color lumps 34 is equal, it is ensured that the quantity when calculating gray value between difference sample is consistent, makes the MTF of acquisition
Value is more accurate.
In the present embodiment, along the mutual not phase of the first test color lumps of horizontal direction of MTF test patterns and the second test color lumps
Neighbour, i.e., different test color lumps are spaced in the horizontal direction；Along MTF test patterns the first test color lumps of vertical direction and
Second test color lumps are mutually non-conterminous, i.e., different test color lumps are spaced in the vertical direction.It, can using this kind of arrangement mode
To increase the diversity of sample, the calculating of mtf value is made to be more in line with statistical law, is as a result more nearly actual value, i.e. result more
Accurately.
In another alternative embodiment of the present invention, each test color lumps of MTF test patterns are in M × Metzler matrix distribution, M
To be more than or equal to 2 integer.As shown in figure 4, the test color lumps of MTF test patterns use 4 × 4 matrix distribution, survey is expanded
The range of examination can be evaluated more accurately.During lens imaging, the clarity closer to camera lens optical axis center image is better, if
For MTF test patterns as shown in Figure 1, test color lumps are nearer apart from optical axis center, the mtf value reliability for calculating acquisition is not high.Therefore
The appropriate number for increasing test color lumps can make the mtf value of acquisition more meet actual value, and evaluation is also more objective and accurate.
Fig. 5 is the flow diagram of the MTF test methods of one embodiment of the invention.As shown in figure 5, the embodiment of the present invention
Test method carried out based on above-mentioned MTF test patterns, including：
Step S51：Through the image of the MTF test patterns of eyeglass acquired projections on the display screen, MTF test patterns
Center is located on the optical axis of eyeglass；
Since the image quality of center of lens and lens edge is different, when setting MTF test patterns by MTF test charts
The center of card and the optical axis coincidence of eyeglass, the size and camera lens size for making MTF test patterns as possible are consistent, and obtain entire mirror
The average mtf value of head allows the image quality of the more accurate objective appraisal camera lens of the mtf value.MTF test patterns are arranged on mirror
Head periphery, close proximity to camera lens, can not only ensure image quality, but also do not influence the follow-up use of camera lens in this way.
Step S52：From the image of MTF test patterns corresponding first image-region of the first test color lumps of selection target,
Corresponding second image-region of the second test color lumps of target, the corresponding third image-region of target ater test color lumps and target
Corresponding 4th image-region of pure white test color lumps；
Based on aforementioned mtf value test pattern, the corresponding image-region of each test color lumps is distinguished, is being calculated
During mtf value, the mtf value of each image-region is calculated respectively, so as to obtain the mtf value of corresponding lens area.
Step S53：According to the gray value of the first image-region, the gray value of third image-region and the 4th image-region
Gray value obtains the mtf value of horizontal direction；According to the gray value of the second image-region, the gray value of third image-region and the 4th
The gray value of image-region obtains the mtf value of vertical direction.
When calculating mtf value, using the gray value of third image-region and the 4th image-region as benchmark, other figures are calculated
As the mtf value in region.Specifically, corresponding mtf value is calculated according to the stripe direction of image-region respectively, such as the first image-region
Black and white strip distribute alternately in the horizontal direction, quantity it is equal, according to the first image-region calculate obtain mtf value be level side
To mtf value；The black and white strip of second image-region vertically distributes alternately, quantity is equal, according to the second image-region
Calculate the mtf value that the mtf value obtained is vertical direction.
Before mtf value is calculated, need to carry out gray value sampling to each image-region.Each test color lumps are divided into multiple
Sampling area determines gray scale maximum value and minimum gray value in each sampling area, and seeks the gray scale of all sampling areas
The average value of maximum value and minimum gray value.Specifically, the first image-region that black and white strip level distributes alternately divides vertically
Sampling area, i.e., on the basis of the width of a pixel, the region that same row pixel is formed on vertical direction is adopted for one
Sample region；The second image-region horizontal division sampling area that black and white strip distributes alternately vertically, i.e., same a line in horizontal direction
The region that pixel is formed is a sampling area.Test obtains the gray value of each pixel, and determines each sample region
The gray scale maximum value and minimum gray value in domain finally ask for the gray scale maximum value of all sampling areas in same image-region respectively
With the average value of minimum gray value.Determine the gray scale maximum value and minimum gray value of third image-region and the 4th image-region
During average value, due to image-region solid colour, the method that horizontal division or numerical division sampling area may be used, here not
Give differentiation.
Horizontal direction mtf value calculating specifically, according to equation below obtain horizontal direction mtf value,
In formula, MTFh1Represent the mtf value of horizontal direction；ImaxhRepresent all sampling areas in described first image region
The average value of gray scale maximum value, IminhThe minimum gray value of all sampling areas is averaged in expression described first image region
Value；IwmaxhRepresent the average value of the gray scale maximum value of all sampling areas in the 4th image-region, IBminhRepresent described
The average value of the minimum gray value of all sampling areas in three image-regions.
Vertical direction mtf value calculating specifically, according to equation below obtain horizontal direction mtf value,
In formula, MTFv1Represent the mtf value of vertical direction；ImaxvRepresent all sampling areas in second image-region
The average value of gray scale maximum value, IminvRepresent being averaged for the minimum gray value of all sampling areas in second image-region
Value；IWmaxvRepresent the average value of the gray scale maximum value of all sampling areas in the 4th image-region, IBminvRepresent described
The average value of the minimum gray value of all sampling areas in three image-regions.
Fig. 6 is the structure diagram of the MTF test devices of one embodiment of the invention.As shown in fig. 6, the embodiment of the present invention
MTF test devices based on above-mentioned MTF test patterns, including：
Image acquisition units 61, for the image of the MTF test patterns through eyeglass acquired projections on the display screen；
Image-region selecting unit 62, for from the image of MTF test patterns the first test color lumps of selection target correspond to
The first image-region, corresponding second image-region of the second test color lumps of target, target ater test color lumps corresponding
Three image-regions and corresponding 4th image-region of target pure white test color lumps；
Horizontal direction mtf value acquiring unit 63, for gray value, the ash of third image-region according to the first image-region
The gray value of angle value and the 4th image-region obtains the mtf value of horizontal direction；
Vertical direction mtf value acquiring unit 64, for gray value, the ash of third image-region according to the second image-region
The gray value of angle value and the 4th image-region obtains the mtf value of vertical direction.
The acquisition mtf value of MTF test devices is identical with the process that mtf value is obtained in the embodiment of method, has carried out above
Detailed description, details are not described herein again.
Fig. 7 is the structure diagram of the electronic equipment of one embodiment of the invention.As shown in fig. 7, the electronic equipment includes
Memory 71 and processor 72 are communicated by internal bus 73 between memory 71 and processor 72 and connected, and memory 71 stores
There is the program instruction that can be performed by processor 72, previously described MTF can be realized when program instruction is performed by processor 72
It is worth test method.
In addition, the logical order in above-mentioned memory 72 can be realized by the form of SFU software functional unit and is used as solely
Vertical product is sold or in use, can be stored in a computer read/write memory medium.Based on such understanding, this hair
The part or the part of the technical solution that bright technical solution substantially in other words contributes to the prior art can be with soft
The form of part product embodies, which is stored in a storage medium, including some instructions making
Computer equipment (can be personal computer, server or the network equipment etc.) performs each embodiment of the application
The all or part of step of the method.And aforementioned storage medium includes：USB flash disk, mobile hard disk, read-only memory (ROM,
Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. it is various
The medium of program code can be stored.
An alternative embodiment of the invention provides a kind of computer readable storage medium, computer-readable recording medium storage
Computer instruction, computer instruction make the computer perform above-mentioned method.
In conclusion according to the technique and scheme of the present invention, by the survey for increasing ater in existing MTF test patterns
Try color lump and lily test color lumps, the distance and pure white at the center of ater test color lumps to MTF test patterns center
The distance at the center of test color lumps to MTF test patterns center is equal, so as to according to the test of horizontal direction black and white strip
The gray value of the corresponding image-region of color lump, the gray scale with the corresponding image-region of vertical direction black and white strip test color lumps
The gray value of value, the gray value of the corresponding image-region of ater test color lumps and the corresponding image-region of pure white test color lumps
Obtain mtf value.When showing that screen intensity changes, due to the difference of the variable quantity of black and white strip gray value and black and white color lump ash
The difference of the variable quantity of angle value is approximately the same and smaller, and mtf value will not change with the change of display screen intensity.In addition, not
For same image-region using different mtf value computational methods, the result for making acquisition is more accurate, seeks the mtf value in different images region
Average value, evaluate camera lens image quality when it is more objective.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware can be used in the present invention
Apply the form of example.Moreover, the computer for wherein including computer usable program code in one or more can be used in the present invention
The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real
The device of function specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
It should be noted that term " comprising ", "comprising" or its any other variant are intended to the packet of nonexcludability
Contain so that process, method, article or equipment including a series of elements not only include those elements, but also including
It other elements that are not explicitly listed or further includes as elements inherent to such a process, method, article, or device.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, also there are other identical elements in article or equipment.
In the specification of the present invention, numerous specific details are set forth.Although it is understood that the embodiment of the present invention can
To put into practice without these specific details.In some instances, well known method, structure and skill is not been shown in detail
Art, so as not to obscure the understanding of this description.Similarly, it should be understood that disclose in order to simplify the present invention and helps to understand respectively
One or more of a inventive aspect, above in the description of exemplary embodiment of the present invention, each spy of the invention
Sign is grouped together into sometimes in single embodiment, figure or descriptions thereof.It however, should not be by the method solution of the disclosure
It releases and is intended in reflection is following：I.e. the claimed invention requirement is than the feature that is expressly recited in each claim more
More features.More precisely, as the following claims reflect, inventive aspect is less than single reality disclosed above
Apply all features of example.Therefore, it then follows thus claims of specific embodiment are expressly incorporated in the specific embodiment,
Wherein each claim is in itself as separate embodiments of the invention.
The above description is merely a specific embodiment, under the above-mentioned introduction of the present invention, those skilled in the art
Other improvement or deformation can be carried out on the basis of above-described embodiment.It will be understood by those skilled in the art that above-mentioned tool
The purpose of the present invention is only preferably explained in body description, and protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of modulation transfer function test pattern, which is characterized in that including：
At least one first test color lumps, at least one second test color lumps, at least one ater test color lumps and at least one
A pure white test color lumps；
First test color lumps include distributing alternately in the horizontal direction, the blackstreak that quantity is equal and white stripes；
Second test color lumps include vertically distributing alternately, the blackstreak that quantity is equal and white stripes；
Distance and the pure white test color lumps of the center of the ater test color lumps to the MTF test patterns center
The distance at center to the MTF test patterns center is equal.
2. MTF test patterns according to claim 1, which is characterized in that the quantity of the ater test color lumps and institute
The quantity for stating pure white test color lumps is equal.
3. MTF test patterns according to claim 1, which is characterized in that along the horizontal direction institute of the MTF test patterns
It states the first test color lumps and second test color lumps is mutually non-conterminous；
It is mutually non-conterminous along the first test color lumps described in the vertical direction of the MTF test patterns and second test color lumps.
4. MTF test patterns according to claim 1, which is characterized in that each test color lumps are in M × Metzler matrix distribution, M
To be more than or equal to 2 integer.
5. a kind of test method of the MTF based on claim 1-4 any one of them modulation transfer function test patterns,
It is characterised in that it includes：
Through the image of the MTF test patterns of eyeglass acquired projections on the display screen, the center of the MTF test patterns is located at
On the optical axis of the eyeglass；
Corresponding first image-region of the first test color lumps of selection target, target second from the image of the MTF test patterns
Corresponding second image-region of test color lumps, the corresponding third image-region of target ater test color lumps and target pure white are surveyed
Try corresponding 4th image-region of color lump；
It is obtained according to the gray value of the gray value in described first image region, the gray value of third image-region and the 4th image-region
Take the mtf value of horizontal direction；
It is obtained according to the gray value of the gray value of second image-region, the gray value of third image-region and the 4th image-region
Take the mtf value of vertical direction.
6. according to the method described in claim 5, it is characterized in that, the gray value according to described first image region,
The gray value of the gray value of three image-regions and the 4th image-region obtains the mtf value of horizontal direction, including：
The mtf value of horizontal direction is obtained according to equation below：
Wherein, MTFh1Represent the mtf value of horizontal direction；ImaxhRepresent in described first image region that gray scale is most in each row pixel
The average value being worth greatly, IminhRepresent the average value of minimum gray value in each row pixel in described first image region；IwmaxhTable
Show the average value of gray scale maximum value in each row pixel in the 4th image-region, IBminhIt represents in the third image-region
The average value of minimum gray value in each row pixel.
7. according to the method described in claim 5, it is characterized in that, the gray value according to second image-region,
The gray value of the gray value of three image-regions and the 4th image-region obtains the mtf value of vertical direction, including：
The mtf value of vertical direction is obtained according to equation below：
Wherein, MTFv1Represent the mtf value of vertical direction；ImaxvRepresent in second image-region that gray scale is most in each row pixel
The average value being worth greatly, IminvRepresent the average value of minimum gray value in each row pixel in second image-region；IwmaxvTable
Show the average value of gray scale maximum value in each row pixel in the 4th image-region, IBminvIt represents in the third image-region
The average value of minimum gray value in each row pixel.
8. a kind of MTF test devices based on claim 1-4 any one of them modulation transfer function test patterns,
It is characterized in that, including：
Image acquisition units, for the image of the MTF test patterns through eyeglass acquired projections on the display screen；
Image-region selecting unit, for from the image of the MTF test patterns the first test color lumps of selection target it is corresponding
Corresponding second image-region of first image-region, the second test color lumps of target, the corresponding third of target ater test color lumps
Image-region and corresponding 4th image-region of target pure white test color lumps；
Horizontal direction mtf value acquiring unit, for according to described first image region gray value, the gray scale of third image-region
The gray value of value and the 4th image-region obtains the mtf value of horizontal direction；
Vertical direction mtf value acquiring unit, for according to second image-region gray value, the gray scale of third image-region
The gray value of value and the 4th image-region obtains the mtf value of vertical direction.
9. device according to claim 8, which is characterized in that the horizontal direction mtf value acquiring unit is specifically used for：
The mtf value of horizontal direction is obtained according to equation below：
Wherein, MTFh1Represent the mtf value of horizontal direction；ImaxhRepresent in described first image region that gray scale is most in each row pixel
The average value being worth greatly, IminhRepresent the average value of minimum gray value in each row pixel in described first image region；IwmaxhTable
Show the average value of gray scale maximum value in each row pixel in the 4th image-region, IBminhIt represents in the third image-region
The average value of minimum gray value in each row pixel；
The vertical direction mtf value acquiring unit is specifically used for：
The mtf value of vertical direction is obtained according to equation below：
Wherein, MTFv1Represent the mtf value of vertical direction；ImaxvRepresent in second image-region that gray scale is most in each row pixel
The average value being worth greatly, IminvRepresent the average value of minimum gray value in each row pixel in second image-region；IWmaxvTable
Show the average value of gray scale maximum value in each row pixel in the 4th image-region, IBminvIt represents in the third image-region
The average value of minimum gray value in each row pixel.
10. a kind of electronic equipment, which is characterized in that the electronic equipment includes memory and processor, the memory and institute
It states to communicate by internal bus between processor and connect, the memory, which is stored with, to be referred to by the program that the processor performs
It enables, described program instruction can realize claim 5-7 any one of them methods when being performed by the processor.
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