CN105654898B - Image capture device is imaged moire fringes suppressing method and its application - Google Patents
Image capture device is imaged moire fringes suppressing method and its application Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The present invention relates to a kind of image capture devices to be imaged moire fringes suppressing method, including step：Control image capture device acquisition LED display lights the monochrome image shown by same color LED light lattice array to obtain acquisition image；(ii) analyzing processing is carried out to acquisition image and is imaged size to obtain the LED light point in acquisition image；(iii) judge whether LED light point imaging size is located at default imaging size interval range；And (iv) is imaged size interval range when judging result is imaged size for LED light point beyond default, adjusts the parameter of image capture device and repetition step (i) is to step (iv) until LED light point imaging size, which is located to preset, is imaged size interval range.The present invention also provides a kind of LED display correction image-pickup methods being imaged moire fringes suppressing method using described image collecting device.The present invention can inhibit the appearance of acquisition image moire fringes by controlling LED light point imaging size.
Description
Technical field
The present invention relates to image variants technical field more particularly to a kind of imaging moire fringes suppressions of image capture device
Method and its application processed.
Background technology
LED display corrects industry in a manner of the pulsewidth modulation (PWM) based on area array cameras as main correction side at present
Formula, this correcting mode precision and efficiency are relatively high, and the area array cameras as LED bright chroma measuring apparatus also there are many, such as
Digital camera with Bayer filter discs, the industrial camera etc. with XYZ filter discs.In contrast, digital camera and industrial camera can reach
To pointwise correction purpose, and the uniformity consistency effect of bright chroma relative correction is very nearly the same, what is more important number phase
Machine is cheap, possesses wide development space, so the pointwise correction mode based on digital camera is rapidly sent out in recent years
Exhibition.
During carrying out pointwise correction to LED display using digital camera, since camera sensitive component itself is tied
Structure can cause the lack sampling problem of LED bright chroma information, and moire fringes (irregular water is likely to occur so as to cause acquisition original image
Ripple) phenomenon so that also there is irregular water ripples interference in LED display after correction, this seriously affects the bright of LED display
Uniformity of chromaticity viewing effect, it is therefore desirable to which effective moire fringes detect suppressing method to instruct pointwise correction process.
The research work of digital camera imaging moire fringes is never interrupted for many years, and also proposed some and eliminate moire fringes
Method, as empirical modal (EMD) method based on spatial domain, the notch filter method based on frequency domain, based on wavelet transformation
Method etc., these methods can preferably eliminate moire fringes under specific circumstances, but LED display alignment requirements accurately acquire
Bright chroma otherness between LED light point, and these methods change the correlation between former light tone degrees of data, lead to pointwise correction
Bright chroma uniformity consistency effect be difficult to ensure, to be difficult to apply to LED display correct industry.
Invention content
Therefore, to overcome defect and deficiency of the existing technology, a kind of image capture device of present invention proposition, which is imaged, to rub
That line suppressing method and a kind of LED display correction image-pickup method.
Specifically, a kind of image capture device that the embodiment of the present invention proposes is imaged moire fringes suppressing method, including step：
(i) control image capture device acquisition LED display lights the monochrome image shown by same color LED light lattice array to be adopted
Collect image；(ii) analyzing processing is carried out to the acquisition image and is imaged size to obtain the LED light point in the acquisition image；
(iii) judge whether the LED light point imaging size is located at default imaging size interval range；And (iv) is when judging result
The LED light point imaging size exceeds the default imaging size interval range, adjusts the parameter of described image collecting device simultaneously
Step (i) is repeated to step (iv) until the LED light point imaging size in acquisition image is located at the default imaging size section
Range.
In one embodiment of the invention, described image collecting device includes digital camera or industrial camera.
In one embodiment of the invention, step (ii) includes sequentially step：Read each figure in the acquisition image
As the designated color component data of pixel；The designated color component data of reading is ranked up according to size；It obtains and reads
Designated color component data in maximum P*Q*N designated color component data and average, wherein P*Q is the same face
The lamp point resolution of color LED light lattice array, N are the integer more than 1；It obtains described in being more than in the designated color component data read
Image slices vegetarian refreshments sum corresponding to the designated color component data of the preset ratio of average value；And calculate LED light point at
As size, wherein LED light point imaging size meets relational expression Size=pCount/ (P*Q), described in wherein Size is indicated
LED light point is imaged size, and pCount indicates described image pixel sum.
In one embodiment of the invention, N=3 and the default imaging size interval range are 50~150.
In one embodiment of the invention, step (iv) specifically includes：Described in being less than when LED light point imaging size
The lower limiting value of default imaging size interval range tunes up the focal length of described image collecting device and/or sets described image acquisition
Standby focusing ring is adjusted to blur direction；When LED light point imaging size is more than the default imaging size interval range
Upper limit value turns the focal length of described image collecting device down and/or the focusing ring of described image collecting device is adjusted to clear side
To.
In one embodiment of the invention, the same color LED light dot matrix is classified as red LED lamp lattice array, green LED
Lamp lattice array or blue LED lamp lattice array.
In addition, a kind of LED display correction image-pickup method that the embodiment of the present invention proposes, including：First, it carries out
Aforementioned any one image capture device imaging moire fringes suppressing method is until in the acquisition image of described image collecting device
LED light point imaging size is located at the default imaging size interval range；Then, using described in the acquisition of described image collecting device
Brightness or bright chroma correction image of the monochrome image that LED display is shown as the LED display.
In brief, the embodiment of the present invention automatically controls the parameter such as focal length of image collecting device or right by software
Whether coke etc., automatic collection image and the LED light point for analyzing current acquired image are imaged size in the big minizone of imaging of setting
Within the scope of, to reach the purpose for inhibiting image capture device to be imaged moire fringes.
Through the following detailed description with reference to the accompanying drawings, other aspects of the invention and feature become apparent.But it should know
Road, which is only the purpose design explained, not as the restriction of the scope of the present invention.It should also be noted that unless another
It points out outside, it is not necessary to which scale attached drawing, they only try hard to conceptually illustrate structure and flow described herein.
Description of the drawings
Below in conjunction with attached drawing, the specific implementation mode of the present invention is described in detail.
Fig. 1 is that a kind of image capture device of the embodiment of the present invention is imaged system architecture used by moire fringes suppressing method
Schematic diagram.
Fig. 2 is that a kind of image capture device of the embodiment of the present invention is imaged the flow chart of moire fringes suppressing method.
Fig. 3 a-3c are the imaging effect picture for the different LED light points imaging size for being relevant to the embodiment of the present invention.
Specific implementation mode
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings to the present invention
Specific implementation mode be described in detail.
Discovery when Image Acquisition is carried out in LED display correction course based on inventor will acquire the LED light on image
Point imaging size, which does certain section limitation, can effectively inhibit the appearance of moire fringes, and the embodiment of the present invention proposes one kind certainly
The focal length of dynamic control image capture device and/or focusing carry out various different degrees of defocus to imaging so that acquisition image
In LED light point imaging size fall within inhibit moire fringes needed for imaging size interval range in, to inhibit going out for moire fringes
It is existing.
Therefore, the following embodiments of the present invention control image capture device such as the focal length of camera, focusing ring by software,
Whether the LED light point imaging size in Image Acquisition and analyzing processing acquisition image, which can reach inhibition, is carried out to LED display
The suitable interval range that moire fringes occur, can so solve problems with：1) personnel for not needing profession are manually repeatedly adjusted
Focal length or focusing ring；2) regulating time is short；And 3) focal length or focusing amount automatically adjusted every time is automatically controlled by software,
It can accurate control and regulation amount.
Specifically, it is described in detail in LED display correction course how to utilize camera with reference to Fig. 1 and Fig. 3 a-3c
Image Acquisition is carried out to LED display, analysis is carried out and according to analysis to the LED light point imaging size in the image collected
As a result it automatically controls camera and carries out parameter regulation such as focus adjustment and/or focal adjustment, so that finally obtaining acquisition image
In the imaging of LED light point be sized to fall in the imaging size interval range inhibited needed for moire fringes, to inhibit moire fringes
Appearance.
Before carrying out Image Acquisition, system as shown in Figure 1 is built first comprising LED display pointwise correction system
System and LED display screen system.Wherein, LED display point-to-point correction system includes camera and is connect with its signal and be equipped with school
The correcting computer of positive software, camera herein is, for example, the digital camera with Bayer filter discs or the industrial camera with XYZ filter discs
Deng the camera with filter disc either without the camera of filter disc；LED display screen system includes control computer (such as PC machine), LED
Display screen and the LED display control programs being connected between control computer and LED display；Correcting computer and control calculate
For machine by LAN connection, camera is fixed on the front of LED display.
Next, carrying out Image Acquisition acquisition image is obtained to obtain acquisition image, carry out analyzing processing to acquisition image
In LED light point imaging size and according to LED light point be imaged size automatically control camera carry out parameter regulation such as focal length tune
Section and/or focal adjustment, specially：
The first step：Correction software sends acquisition image command to camera, and camera acquisition LED display lights same color LED
Monochrome image shown by lamp lattice array is to obtain acquisition image and acquisition image is returned to correction software；Wherein, complete with RGB
For color LED display, light same color LED light lattice array can be light red in the entire display area of LED display,
Green or blue LED lamp point, or be red, green or the blue LED lamp point lighted in LED display regional area；Phase
Ying Di, shown monochrome image are red image, green image or blue image.
Second step：Correction software carries out analyzing processing to acquisition image and is imaged greatly with obtaining the LED light point in acquisition image
Small, wherein LED light point imaging acquiring size method is, for example,：Assuming that when headlight point resolution is (with color LED light lattice array)
128*128 and acquisition image are red image, then：A) red (R) number of components of each image slices vegetarian refreshments in acquisition image is read
According to b) the R component data of reading are ranked up according to size, c) obtain maximum 128*128*N R component data and ask flat
Mean value is denoted as avg (R), d) obtain read R component data in more than avg (R) * M% R component data corresponding to image slices
Vegetarian refreshments sum is denoted as pCount；And e) calculate LED light point imaging size Size=pCount/ (128*128).Wherein, N is
Value more than 1 integer and typical N=3, M% is, for example, 10% or the bigger value of a bit.Furthermore, it is necessary to explanation
It is, for the situation that acquisition image is red image, to calculate the color component data that LED light point imaging size uses and be not limited to R
Component data can also be other color component datas such as G component datas.In addition, it is noted that for other colors
Image, such as green image and blue image are acquired, aforementioned same method may be used and calculate LED light point imaging size.
Third walks：Judge whether LED light point imaging size is located at default imaging size interval range such as 50~150.
4th step：If LED light point is imaged size beyond default imaging size interval range, correction software control adjustment phase
The parameter of machine such as focal length and/or focusing, and first to fourth step is repeated until LED light point imaging size is big positioned at default imaging
Minizone range, whole flow process legend are as shown in Figure 2.Wherein, for the parameter adjustment of camera, if LED light point imaging size is inclined
Small (namely lower limiting value less than default imaging size interval range), then tune up focal length or focusing ring be adjusted to fuzzy side
To；Conversely, if LED light point imaging size is (namely upper limit value more than default imaging size interval range) bigger than normal, coke is turned down
It is adjusted to clear direction away from or by focusing ring.
Hold above-mentioned, by taking default imaging size interval range is 50~150 as an example, but the present invention is not limited thereto, can be with
Elastic adjustment is done according to actual conditions.
A) when LED light point imaging size is less than 50, imaging effect is as shown in Figure 3a, it may appear that LED light point is in camera
Sharper point is presented on the image of acquisition, causes lamp point lack sampling, the color component data of acquisition inaccurate, it is also possible to rub
That line；
B) when LED light point is imaged size between 50-150, imaging effect is as shown in Figure 3b, can inhibit to rub at this time
The appearance of your line；And
C) when LED light point imaging size is more than 150, imaging effect is as shown in Figure 3c, it may appear that LED light point is in camera
It is pasted completely on the image of acquisition and the partially dark brighter phenomenon in outside of lamp dot center is presented together or on the image that camera acquires,
The Luminance Distribution of LED light point is not met (brightness from inside to outside is from high to low).
In addition, when the LED light point imaging size in the acquisition image of camera is located at default imaging size interval range,
Indicate that the imaging moire fringes of camera at this time have been effectively suppressed；LED display can be controlled later shows monochrome image
Carry out Image Acquisition for camera to obtain LED display brightness or bright chroma correction image, the brightness collected at this time or
Apparent moire fringes would not occur in bright chroma correction image, to be conducive to the promotion of correction accuracy.
In conclusion the embodiment of the present invention carries out analyzing processing by the acquisition image to image capture device such as camera
Obtain acquisition image in LED light point imaging size and according to LED light point be imaged size come automatically control camera focal length and/or
Focusing is until the LED light point imaging in finally obtained acquisition image is sized to fall within the imaging size inhibited needed for moire fringes
In interval range, to inhibit the appearance of moire fringes；In this way, straightened up in place personnel do not have to the focal length or right for frequently adjusting camera
Jiao Huan realizes the intelligence and automation of camera parameter adjusting, is not necessarily to manual intervention, it is possible to reduce regulating time.
Finally it is worth mentioning that the acquisition sides of the LED light point imaging size in the acquisition image that previous embodiment is related to
Method can also be other methods, such as：The zone location and point location that comparative maturity in the prior art is carried out to acquisition image,
Single led lamp is calculated after point location selects image slices vegetarian refreshments sum occupied by imaging in acquiring image as LED light
Point imaging size.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, as long as be without departing from technical solution of the present invention content, it is right according to the technical essence of the invention
Any simple modification, equivalent change and modification made by above example, in the range of still falling within technical solution of the present invention.
Claims (7)
1. a kind of image capture device is imaged moire fringes suppressing method, which is characterized in that including step：
(i) control image capture device acquisition LED display lights the monochrome image shown by same color LED light lattice array to obtain
To acquisition image；
(ii) analyzing processing is carried out to the acquisition image and is imaged size to obtain the LED light point in the acquisition image；
(iii) judge whether the LED light point imaging size is located at default imaging size interval range；And
(iv) when judging result is that the LED light point is imaged size and exceeds the default imaging size interval range, described in adjustment
The parameter of image capture device simultaneously repeats step (i) to step (iv) until the LED light point imaging size in acquisition image is located at
The default imaging size interval range.
2. image capture device as described in claim 1 is imaged moire fringes suppressing method, which is characterized in that described image acquires
Equipment includes digital camera or industrial camera.
3. image capture device as described in claim 1 is imaged moire fringes suppressing method, which is characterized in that step (ii) is sequentially
Including step：
Read the designated color component data of each image slices vegetarian refreshments in the acquisition image；
The designated color component data of reading is ranked up according to size；
It obtains maximum P*Q*N designated color component data in the designated color component data read and averages, wherein
P*Q is the lamp point resolution of the same color LED light lattice array, and N is the integer more than 1；
Obtain the designated color component data institute for the preset ratio for being more than the average value in the designated color component data read
Corresponding image slices vegetarian refreshments sum；And
LED light point imaging size is calculated, wherein LED light point imaging size meets relational expression Size=pCount/ (P*
Q), wherein Size indicates that the LED light point is imaged size, and pCount indicates described image pixel sum.
4. image capture device as claimed in claim 3 is imaged moire fringes suppressing method, which is characterized in that N=3 and described pre-
It is set as size interval range being 50~150.
5. image capture device as described in claim 1 is imaged moire fringes suppressing method, which is characterized in that step (iv) is specific
Including：
When lower limiting value of the LED light point imaging size less than the default imaging size interval range, tunes up described image and adopt
Collect the focal length of equipment and/or the focusing ring of described image collecting device is adjusted to blur direction；
When upper limit value of the LED light point imaging size more than the default imaging size interval range, turns described image down and adopt
Collect the focal length of equipment and/or the focusing ring of described image collecting device is adjusted to clear direction.
6. image capture device as described in claim 1 is imaged moire fringes suppressing method, which is characterized in that the same to color
LED light dot matrix is classified as red LED lamp lattice array, green LED lamp lattice array or blue LED lamp lattice array.
7. a kind of LED display correction image-pickup method, which is characterized in that including：
First, the image capture device imaging moire fringes suppressing method as described in claim 1 to 6 any one is carried out until institute
It states the imaging of the LED light point in the acquisition image of image capture device size and is located at the default imaging size interval range；
Then, monochrome image that the LED display is shown is acquired as the LED display using described image collecting device
Brightness or bright chroma correction image.
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| CN107578710B (en) * | 2016-07-04 | 2020-04-14 | 西安诺瓦星云科技股份有限公司 | Method for adjusting optical path according to imaging size of LED display module |
| CN106448546B (en) * | 2016-11-16 | 2018-11-30 | 西安诺瓦电子科技有限公司 | Automatically adjust the method and LED bright chroma bearing calibration of imaging surface product size |
| CN108615227B (en) * | 2018-05-08 | 2021-02-26 | 浙江大华技术股份有限公司 | Image moire inhibition method and device |
| CN110661969B (en) * | 2019-08-19 | 2021-09-10 | 厦门快商通科技股份有限公司 | Image acquisition method and device for display screen, electronic equipment and medium |
| CN112581904B (en) * | 2019-09-30 | 2021-10-08 | 华中科技大学 | Moire compensation method for brightness gray scale image of OLED (organic light emitting diode) screen |
| CN113489914B (en) * | 2021-06-18 | 2023-04-07 | 深圳市安星数字***有限公司 | Auxiliary lighting method, device, system and computer readable storage medium |
| CN113257181B (en) * | 2021-06-29 | 2021-10-22 | 卡莱特云科技股份有限公司 | LED screen correction image acquisition method, correction method, acquisition device and correction system |
| CN113723393B (en) * | 2021-11-03 | 2022-03-18 | 浙江宇视科技有限公司 | Image acquisition method, image acquisition device, electronic device, and medium |
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| JP2009156857A (en) * | 2007-12-05 | 2009-07-16 | Micronics Japan Co Ltd | Display panel inspection method and inspection device |
| CN102123291B (en) * | 2011-02-12 | 2013-10-09 | 中山大学 | Intelligent naked-eye stereoscopic display system and control method thereof |
| CN103426403B (en) * | 2013-08-16 | 2015-09-16 | 西安诺瓦电子科技有限公司 | The correction image-pickup method of LED display, picture display process and bearing calibration |
| JP2016050982A (en) * | 2014-08-29 | 2016-04-11 | サイバネットシステム株式会社 | Luminance correction device and system including the same, and luminance correction method |
| CN104394391B (en) * | 2014-11-25 | 2016-09-28 | 广东威创视讯科技股份有限公司 | The image processing method of the dot matrix image of collected by camera and system |
| CN104486534B (en) * | 2014-12-16 | 2018-05-15 | 西安诺瓦电子科技有限公司 | Moire fringes detect suppressing method and device |
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Address after: 710075 DEF101, Zero One Square, Xi'an Software Park, No. 72 Zhangbajie Science and Technology Second Road, Xi'an High-tech Zone, Shaanxi Province Patentee after: Xi'an Nova Nebula Technology Co., Ltd. Address before: 710075 Qinfengge D District 201, Xi'an Software Park, 68 Science and Technology Second Road, Xi'an High-tech Zone, Shaanxi Province Patentee before: Xian Novastar Electronic Technology Co., Ltd. |