CN109600604A - Contrast test method, device and computer readable storage medium - Google Patents
Contrast test method, device and computer readable storage medium Download PDFInfo
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- CN109600604A CN109600604A CN201811333053.XA CN201811333053A CN109600604A CN 109600604 A CN109600604 A CN 109600604A CN 201811333053 A CN201811333053 A CN 201811333053A CN 109600604 A CN109600604 A CN 109600604A
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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
Abstract
This application involves field of display devices, provide a kind of contrast test method and device, and a kind of computer readable storage medium, wherein contrast test method includes the following steps: contrast test method, it is characterized by comprising the following steps: obtaining the region contrast of the peripheral field in region to be tested in the ideal situationWherein, the x is that the visual field in the region to be tested accounts for the ratio of full filed；Obtain the contrast of central vision in the ideal situationObtain the region contrast of the peripheral field in region to be tested in practical situationsWherein, the x is that the visual field in the region to be tested accounts for the ratio of full filed；The final contrast value in the region to be tested isThe application can be improved more accurate measurement result.
Description
Technical field
This application involves field of display devices, in particular to a kind of contrast test method and Intelligent car window control system.
Background technique
Contrast refer to light and shade region in piece image it is most bright it is white and most dark it is black between different brightness levels survey
Amount, disparity range is bigger, and representative comparison is bigger, and the smaller representative comparison of disparity range is smaller.
Influence of the contrast to visual effect is very crucial, and in general contrast is bigger, and the image the clear eye-catching, color
Also more distinct gorgeous；And contrast is small, then entire picture can be allowed all dusky.Clarity, thin of the high contrast for image
Section performance, gray-level performance all have very great help.
It in the prior art, is using collection lens come mould to the main method of the contrast test of image playing apparatus
Anthropomorphic eye is observed.However, being set in the broadcasting of the New Images such as VR (virtual reality), MR (mixed reality), AR (augmented reality)
In standby, in order to guarantee the experience effect of immersion, it will usually use very big field angle.
Contrast measurement method used by the prior art, in the measurement result of the image playing apparatus for big field angle
There are large errors.
Summary of the invention
To solve the above-mentioned problems or it at least is partially solved above-mentioned technical problem, in the embodiment of the application
In, a kind of contrast test method is provided, is included the following steps:
Obtain the region contrast of the peripheral field in region to be tested in the ideal situationWherein, the x be it is described to
The visual field of test zone accounts for the ratio of full filed；
Obtain the contrast of central vision in the ideal situation
Obtain the region contrast of the peripheral field in region to be tested in practical situationsWherein, the x is described
The visual field in region to be tested accounts for the ratio of full filed；
The final contrast value in the region to be tested is
Another embodiment herein provides a kind of contrast test device, is suitable for image playing apparatus, comprising:
Collection lens, the display area setting of face described image playback equipment；
Image input medium is stored with the first graph card and the second graph card, wherein first graph card is for testing ideal shape
Contrast under state, second graph card are used for the contrast tested under actual conditions；
Described image input medium accesses described image playback equipment, described image playback equipment is played described
The content of each graph card stored in image input medium plays back, to generate image；
Processing equipment, with described image acquisition camera lens communication connection；
The processing equipment is used to acquire camera lens by described image, obtains:
The region contrast of the peripheral field in region to be tested in the ideal situationWherein, the x is described to be tested
The visual field in region accounts for the ratio of full filed；
The contrast of central vision in the ideal situation
The region contrast of the peripheral field in region to be tested in practical situationsWherein, the x is described to be measured
The visual field in examination region accounts for the ratio of full filed；
The processing equipment is also used to obtain that the final contrast value in the region to be tested is
In the contrast test method and its system of the application, to ideally contrast on border and center contrast
Measurement, the two ratio obtained (contrast rating) be because illuminance of image plane unevenness, edge illumination it is too low and to contrast
Measurement generate factor coefficient.After the application multiplies it by region contrast in practical situations, realize to every
The contrast value in a region has carried out the normalization about region contrast under ideal conditions, and it is uneven to eliminate each regional luminance
Influence of the property to contrast.
In terms of existing technologies, the contrast test method of the application and its system can be excluded effectively due to regarding greatly
Regional luminance caused by is unevenly influenced caused by the measurement of contrast value, improves test accuracy.
Detailed description of the invention
It, below will be to embodiment in order to illustrate more clearly of the application embodiment or technical solution in the prior art
Or attached drawing needed to be used in the description of the prior art is briefly described.It should be evident that the accompanying drawings in the following description is only used for
The some embodiments for illustrating the application, for those of ordinary skill in the art, in the premise not made the creative labor
Under, be also possible to obtain other drawings based on these drawings in unmentioned technical characteristic, connection relationship or even method and step.
Fig. 1 is the flow chart of the contrast test method of the application；
Fig. 2 is the operation principle schematic diagram of the contrast test device of the application；
Fig. 3 is the picture material schematic diagram of the first graph card of the application；
Fig. 4 is the picture material schematic diagram of the second graph card of the application.
Description of symbols:
1- collection lens；2- image input medium；3- image playing apparatus；The display area 4-；5- processing equipment；6-
Lens；
Specific embodiment
To keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with the application specific embodiment and
The technical solution of the application is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the application
A part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall in the protection scope of this application.
Embodiment one
The inventors of the present application found that the contrast test method of the prior art is difficult to meet in the emerging figure such as VR, MR, AR
As the testing requirement in playback equipment.Itself the reason is as follows that:
In general, in large visual field optical system, the non-uniform phenomenon of illuminance of image plane inevitably occurs, shows as
The brightness for degree of understanding without being told is greater than edge illumination, and then the benchmark for causing center to measure from the contrast of peripheral field is different.
Specifically, according to Lambert law, illuminance of image plane is reduced in the ratio of 4 power of cosine of off-axis angle.That is:
E=cos4ω；
Wherein E is illuminance of image plane, and ω is off-axis angle.In fact, edge illumination can also be lower due to gradual halation phenomena.It uses
When wide-angle and heavy caliber camera lens, field angle is bigger, this phenomenon is particularly evident.
To sum up learn, in large visual field optical system, illuminance of image plane be it is non-uniform, center and peripheral field brightness are different
It causes, it is the big the very crux for leading to the test result inaccuracy of contrast that benchmark is different.
In view of this, the first embodiment of the application provides a kind of contrast test method, shown in Figure 1, packet
Include following steps:
Obtain the region contrast of the peripheral field in region to be tested in the ideal situationWherein, the x is described
The visual field in region to be tested accounts for the ratio of full filed；
The contrast of central vision is obtained in the ideal situation
Obtain the region contrast of the peripheral field in region to be tested in practical situationsWherein, the x is described
The visual field in region to be tested accounts for the ratio of full filed；
The final contrast value in the region to be tested is
Based on the above method, presently filed embodiment additionally provides a kind of contrast test device, broadcasts suitable for image
Equipment 3 is put, it is shown in Figure 2, comprising:
The display area 4 of collection lens 1, face described image playback equipment 3 is arranged；
Image input medium 2 is stored with the first graph card and the second graph card, wherein first graph card is for testing ideal
Contrast under state, second graph card are used for the contrast tested under actual conditions；
Described image input medium 2 accesses described image playback equipment 3, and described image playback equipment 3 is played
The content of each graph card stored in described image input medium 2 plays back, to generate image；
Processing equipment 5 is communicated to connect with described image acquisition camera lens 1；
The processing equipment 5 is used to acquire camera lens 1 by described image, obtains:
The region contrast of the peripheral field in region to be tested in the ideal situationWherein, the x is described to be measured
The visual field in examination region accounts for the ratio of full filed；
The contrast of central vision in the ideal situation
The region contrast of the peripheral field in region to be tested in practical situationsWherein, the x is described to be measured
The visual field in examination region accounts for the ratio of full filed；
The processing equipment 5 is also used to obtain that the final contrast value in the region to be tested is
In this application, signified collection lens 1 can be the industrial wide-angle lens of various big visual fields, corresponding map
As playback equipment 3 is big view field image playback equipment 3, such as LCD or OLED display screen in VR, MR, AR equipment.Existing
In the equipment such as VR or AR, lens 6 can be usually placed before image playing apparatus 3, to form the void of amplification at display area 4
Picture, for human eye viewing.Collection lens 1 can be used as the simulation of human eye, be arranged on the best ornamental position of display area 4
It sets, with the virtual image for obtaining the image generated of image playing apparatus 3.
It will be transferred in processing equipment 5 by the image data obtained of collection lens 1.Wherein, processing equipment 5 can
To be to be connected via wire or wirelessly host computer with collection lens 1.By means of in the prior art based on artificial
The image recognition program of intelligence, can carry out quantitative calculating to image data and provide calculated result, therefore, should by calculating
The contrast of the virtual image can be obtained the quantitatively evaluating to image playing apparatus 3.
Image input medium 2 can be the various media for having store function, such as USB flash disk, floppy disk, CD etc., can also be with
It is the various storing mechanisms being set in equipment, such as hard disk or flash memory.The content of graph card can be is deposited in a manner of virtual data
It is stored among image input medium 2, is also possible to adapt to the dedicated tangible card of image playing apparatus 3.
Optionally, the x can be any number in 0 to 1, especially can be 0.5,0.7 or 1.X is described to be tested
The visual field in region accounts for the ratio of full filed.That is, the application can not only measure the contrast of full filed, it can also basis
Need to measure the contrast of various peripheral fields (0.5 visual field, 0.7 visual field, 1 visual field), this is retouched in the contrast of big visual field product
There is directive significance during drawing.In this application, when definition x is 0, region to be tested is center region.
Optionally, the region contrast is shown on the edge in the region to be tested by measuring played graph card
Image and obtain；Described image has the grid of array distribution, and content shown in adjacent grid is different.
The accuracy of measurement can be improved using the grid of array distribution.Specifically, it is described ideally, it is adjacent
Grid is separately filled with black and white.
It shows in the content of graph card, shown in Figure 3, the image of first graph card has the side of array distribution
Lattice, and adjacent grid is separately filled with black and white.
Wherein it is possible to which the densely covered grid of array on the first graph card, only can also be arranged these grids at the edge of surrounding.It adopts
Gathered with array grid mode when, measuring 0.5 visual field and 0.7 visual field during does not need to the content of graph card or aobvious
Show that the size in region 4 adjusts, improves convenience.
And further optionally, it is filled with striped under the actual conditions, in grid, and adjacent grid is filled
Striped is perpendicular to one another.In order to improve measuring accuracy, the striped can be spaced black and white strip.
It shows in the content of graph card, shown in Figure 4, the image of second graph card has the side of array distribution
Lattice, grid is interior to be filled with spaced black and white strip, and the striped that adjacent grid is filled is perpendicular to one another.
Likewise, can on the second graph card array gather grid, these grids only can also be set at the edge of surrounding.
In addition it is noted that central cross line can be arranged on the first graph card and the second graph card, in order to fixed
Position central point.On the first graph card and the second graph card, the center on especially the first graph card can be equipped with grid, and adjacent
Grid be separately filled with black and white, in order to measure ideally obtain central vision contrast
The first embodiment of the application additionally provides a kind of contrast test side based on above-mentioned contrast test macro
Method, the operational process of the contrast when testing full filed (x=1) are referring to fig. 1 to fig. 4, specific as follows:
1, shown in Figure 2, the display area 4 that face described image playback equipment 3 is arranged in collection lens 1 is set
The position set, adjustment keep it consistent with the visual position of user, and image input medium 2 is accessed described image playback equipment 3,
Play the content of the first graph card.It is in display area 4 that the image for showing the first graph card is as shown in Figure 3.
2, the black and white grid at edge of the peripheral field in region to be tested in perfect condition, that is, the first graph card is obtained
Region contrast
3, the contrast of central vision in the ideal situation is obtained
4, contrast rating ideally is calculatedWherein,Accordingly, by contrast rating,
The normalization that ideally region contrast may be implemented excludes the influence that each regional luminance unevenness measures contrast.
5, switching plays the content in the second graph card, in display area 4 that the image for showing the second graph card is as shown in Figure 4.
Obtain the region contrast of the peripheral field in region to be tested in practical situations
6, the final contrast value obtained under actual conditions is calculated, are as follows:
As it was noted above, the application is equally applicable to the contrast test of central vision, half field-of-view, 0.7 visual field.With it is above-mentioned
The step of be located at difference be, need select with region to be tested corresponding to graph card.Alternatively, gathering the figure of grid in array
Specific region to be tested is selected in card to obtain contrast.In the range of 0≤x≤1, the value of x can be arbitrarily formulated,
Exactly measured with arbitrary visual field size.
Typically, as x=0,
As x=0.5,
As x=0.7,
As x=1,
In conclusion
The value of specific x can according to need to specify, and no longer be repeated herein.
In the contrast test method and its system of the application, to ideally contrast on border and center contrast
Measurement, the two ratio obtained (contrast rating) be because illuminance of image plane unevenness, edge illumination it is too low and to contrast
Measurement generate factor coefficient.After the application multiplies it by region contrast in practical situations, realize to every
The contrast value in a region has carried out the normalization about region contrast under ideal conditions, so that the measuring basis of contrast becomes
It is bordering on unanimously, to eliminate influence of each regional luminance inhomogeneities to contrast.
In terms of existing technologies, the contrast test method of the application and its system can be excluded effectively due to regarding greatly
Regional luminance caused by is unevenly influenced caused by the measurement of contrast value, improves test accuracy.
Embodiment two
Second embodiment of the present invention provides a kind of computer readable storage medium, is stored with computer program, meter
The step of method in first embodiment is realized when calculation machine program is executed by processor.
Above-mentioned steps can be automatically completed by computer program, are improved efficiency.
The processor of present embodiment meaning can be central processing unit (Central Processing Unit,
CPU), but in alternative, which can be any conventional processor, controller, microcontroller, state machine, number
Word signal processor (Digital Signal Processor, DSP), specific integrated circuit (Appl ication Specific
Integrated Circuit, ASIC), ready-made programmable gate array (Field-Programmable Gate Array, FPGA)
Either other programmable logic device, discrete gate or transistor logic, discrete hardware components etc..Processor can also quilt
It is embodied as calculating the combination of equipment, such as DSP and the combination of microprocessor, multi-microprocessor, cooperate with DSP core one
Or multi-microprocessor or any other such configuration.
In one or more illustrative embodiments, described function can be in hardware, software, firmware or its any group
It is realized in conjunction.If being embodied as computer program product in software, each function can be used as the instruction of one or more items or
Code may be stored on the computer-readable medium or be transmitted by means of it.Computer-readable medium includes computer storage medium and leads to
Believe both media comprising any medium for facilitating computer program to shift from one place to another.Storage medium can be energy
Any usable medium being accessed by a computer.It is non-limiting as example, such computer-readable medium may include RAM,
ROM, EEPROM, CD-ROM or other optical disc storages, disk storage or other magnetic storage apparatus can be used to carry or store
The desirable program code of instruction or data structure form and any other medium that can be accessed by a computer.Any connection is also by just
Locality is known as computer-readable medium.For example, if software is using coaxial cable, fiber optic cables, twisted pair, digital subscriber line
(DSL) or the wireless technology of such as infrared, radio and microwave etc is from web site, server 140 or other long-range
Source transmission, the then coaxial cable, fiber optic cables, twisted pair, DSL or such as infrared, radio and microwave etc
Wireless technology is just included among the definition of medium.Disk (disk) and dish (disc) as used herein include compression dish
(CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and blu-ray disc, which disk (disk) are often reproduced in a manner of magnetic
Data, and dish (disc) with laser reproduce data optically.Combinations of the above should also be included in computer-readable medium
In the range of.As an alternative solution, storage medium can be integrated into processor.Pocessor and storage media can reside in
In ASIC.ASIC can reside in user terminal.Or in alternative, pocessor and storage media also can be used as discrete sets
Part is resident in the user terminal.
In the contrast test method and its system of the application, to ideally contrast on border and center contrast
Measurement, the two ratio obtained (contrast rating) be because illuminance of image plane unevenness, edge illumination it is too low and to contrast
Measurement generate factor coefficient.After the application multiplies it by region contrast in practical situations, realize to every
The contrast value in a region has carried out the normalization about region contrast under ideal conditions, and it is uneven to eliminate each regional luminance
Influence of the property to contrast.
In terms of existing technologies, the contrast test method of the application and its system can be excluded effectively due to regarding greatly
Regional luminance caused by is unevenly influenced caused by the measurement of contrast value, improves test accuracy.
In above-mentioned each embodiment, although the above method to be illustrated to and is described as a series of move to simplify to explain
Make, but it should be appreciated by those skilled in the art that and understand, the order that these methods are not acted is limited, because according to one
A or multiple embodiments, some movements can occur in different order and/or with from it is depicted and described herein or herein not
Diagram and description but it will be appreciated by those skilled in the art that other movements concomitantly occur.In addition, the ordinary skill of this field
Personnel are appreciated that reader is made to more fully understand that the application, embodiments of the present invention propose many technical details.But
It is, even if can also realize this substantially without these technical details and based on the various changes and modifications of the respective embodiments described above
Apply for each claim technical solution claimed.It therefore, in practical applications, can be in the form and details to upper
Stating embodiment, various changes can be made, without departing from the spirit and scope of the present invention.
Claims (10)
1. a kind of contrast test method, which comprises the steps of:
Obtain the region contrast of the peripheral field in region to be tested in the ideal situationWherein, the x is described to be tested
The visual field in region accounts for the ratio of full filed；
Obtain the contrast of central vision in the ideal situation
Obtain the region contrast of the peripheral field in region to be tested in practical situationsWherein, the x is described to be tested
The visual field in region accounts for the ratio of full filed；
The final contrast value in the region to be tested is
2. contrast test method according to claim 1, which is characterized in that the x is 0.5,0.7 or 1.
3. contrast test method according to claim 1, which is characterized in that the region contrast is broadcast by measurement
Image that the graph card put is shown on the edge in the region to be tested and obtain；
Described image has the grid of array distribution, and content shown in adjacent grid is different.
4. contrast test method according to claim 3, which is characterized in that it is described ideally, adjacent side
Lattice are separately filled with black and white.
5. contrast test method according to claim 3, which is characterized in that under the actual conditions, filled out in grid
Filled with striped, and the striped that adjacent grid is filled is perpendicular to one another.
6. contrast test method according to claim 5, which is characterized in that the striped is spaced black and white item
Line.
7. a kind of computer readable storage medium, is stored with computer program, which is characterized in that the computer-readable storage medium
The computer program that matter is stored can be realized the step as described in any one of claim 1 to 6 when being executed by processor
Suddenly.
8. a kind of contrast test device is suitable for image playing apparatus characterized by comprising
Collection lens, the display area setting of face described image playback equipment；
Image input medium is stored with the first graph card and the second graph card, wherein first graph card is for testing ideally
Contrast, second graph card is used to test contrast under actual conditions；
Described image input medium accesses described image playback equipment, and described image playback equipment is enabled to play described image
The content of each graph card stored in input medium plays back, to generate image；
Processing equipment, with described image acquisition camera lens communication connection；
The processing equipment is used to acquire camera lens by described image, obtains:
The region contrast of the peripheral field in region to be tested in the ideal situationWherein, the x is the region to be tested
Visual field account for the ratio of full filed；
The contrast of central vision in the ideal situation
The region contrast of the peripheral field in region to be tested in practical situationsWherein, the x is the region to be tested
Visual field account for the ratio of full filed；
The processing equipment is also used to obtain that the final contrast value in the region to be tested is
9. contrast test device according to claim 8, which is characterized in that the image of first graph card has array
The grid of distribution, and adjacent grid is separately filled with black and white.
10. contrast test device according to claim 8, which is characterized in that the image of second graph card has battle array
The grid of column distribution, grid is interior to be filled with spaced black and white strip, and the striped that adjacent grid is filled is perpendicular to one another.
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| CN113726981A (en) * | 2021-09-30 | 2021-11-30 | 北京耐德佳显示技术有限公司 | Image data processing method, electronic device, and storage medium |
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