CN105976753B - Abnormal lamp point in LED display correction detects compensation method - Google Patents
Abnormal lamp point in LED display correction detects compensation method Download PDFInfo
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- CN105976753B CN105976753B CN201610560778.7A CN201610560778A CN105976753B CN 105976753 B CN105976753 B CN 105976753B CN 201610560778 A CN201610560778 A CN 201610560778A CN 105976753 B CN105976753 B CN 105976753B
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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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- 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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
Abstract
The present invention proposes the abnormal lamp point detection compensation method in a kind of correction of LED display, it obtains abnormal lamp point detection threshold value according to the multiple lamp point datas for the destination display area for corresponding to LED display, position and the record of abnormal lamp point data are detected from the multiple lamp point data further according to the abnormal lamp point detection threshold value, then corrects abnormal lamp lighting point data using the non-abnormal lamp point data in the part in the multiple lamp point data.Therefore, the abnormal lamp point in LED display correction proposed by the present invention detects compensation method, can be convenient quickly detection and compensates abnormal lamp point, acquisition data grading itself is avoided to influence；And can to avoid the cumbersome local secondary correct operation of straightened up in place personnel, avoid part and whole transition problem.
Description
Technical field
The present invention relates to LED to show the abnormal lamp point in alignment technique field more particularly to a kind of correction of LED display
Detect compensation method.
Background technique
In recent years, the big, work with its sensor acquisition data volume of the LED display pointwise correction technology based on area array cameras
The advantages that high-efficient, calibration result is stablized but still has some scene LED by the favor of LED display manufacturer and user
Display screen can correct out individual abnormal bright dim spot phenomenons in correction course, and the possible cause for generating this kind of phenomenon has: 1) acquiring
It blocks；2) camera lens external dirty point, finger-marks；And 3) CCD bad point, dust etc. inside camera lens.These factors all can
The local pixel of acquisition image is influenced, individual abnormal bright dim spots occurs so as to cause pointwise correction LED display, seriously affects
To user to the viewing effect of LED screen body.
Therefore, proposition handles abnormal bright dim spot using software algorithm in the prior art, namely: by stepping through judgement
When headlight lights angle value and acquires the departure of data mean value, when departure is more than that given threshold value is determined as abnormal lamp point, then benefit
It replaces lighting angle value when headlight with acquisition data mean value.However, such technical solution has the disadvantage that a) LED display is certainly
The gradient problem that body production technology or camera acquisition angles etc. may give acquisition data band different degrees of, such as image center number
Phenomenon left large and right small can be presented by then acquiring data with respect to LED screen body position placement to the left according to slightly above four weekly datas or camera
Deng, therefore determine that the error of abnormal lamp point is unstable using acquisition data mean value, it is understood that there may be false detection rate situation bigger than normal；B) it is directed to
The setting difficulty of the acquisition data of Different field, departure judgment threshold is big.
In addition, there is proposition to correct using local secondary also in the prior art to handle abnormal bright dim spot, and namely: for entire
Image does secondary correction after the shooting partial correction of the defects of effect position after LED display correction, to repair defective locations
Lamp point brightness value.However such technical solution, on the one hand when LED display exception lamp point is more and distribution relatively dissipates, part two
The process operation of secondary correction is relatively cumbersome, takes time and effort；The correction of another aspect local secondary may be brought to be corrected with the whole screen of surrounding
There are slight bright chroma differences with whole screen for the transition problem of effect, i.e. part.
Summary of the invention
Therefore, based on exception lamp point problem present in prior art LED display pointwise correction, the present invention proposes one kind
Abnormal lamp point in LED display correction detects compensation method, can improve to a certain extent, even be eliminated using band
The abnormal lamp point problem that the acquisition Data correction LED display of defect occurs, so that for example based on image capture device
The pointwise correction uniformity consistency effect of area array cameras is centainly promoted, more by the favorable comment of user.
Specifically, the abnormal lamp point in a kind of correction of LED display that the embodiment of the present invention proposes detects compensation method,
Comprising steps of (a) obtains abnormal lamp point detection according to the multiple lamp point datas for the destination display area for corresponding to LED display
Threshold value；(b) the multiple lamp point data is stepped through with the first traversal template and obtains each lamp point data relative to described the
One traversal template in designated position multiple lamp point datas mean value deviation and by the deviation of each lamp point data with
The exception lamp point detection threshold value is compared position and record to detect abnormal lamp point；And (c) with the second traversal mould
Version steps through the multiple lamp point data, and in counting the second traversal template when headlight point is abnormal lamp point just
Lamp point data corresponding to normal lamp point simultaneously calculates its mean value as the lamp point data correction value for working as headlight point.
In one embodiment of the invention, the multiple lamp point data is the lamp point data after smothing filtering.
In one embodiment of the invention, the LED display is LED display, and the destination display area
For the entire display area of the LED display or partial display area.
In one embodiment of the invention, the multiple lamp point data is brightness data, chroma data or correction coefficient
Data.
In one embodiment of the invention, step (a) specifically includes: the multiple lamp point data is divided into more by (a1)
A data block；(a2) block-by-block calculates the deviation ratio mean value of each data block；(a3) more the multiple data block is described
Deviation ratio mean value is to obtain minimum deflection ratio mean value；And (a4) obtained according to the minimum deflection ratio mean value it is described different
Normal lamp point detection threshold value.
In one embodiment of the invention, in step (a1), the multiple data block is greater than or equal to nine data
Block.
In one embodiment of the invention, step (a2) specifically includes: block-by-block calculates the lamp point in each data block
Minimum value, maximum value and the average value of data；And block-by-block calculate the minimum value and the average value the first deviation ratio,
The second deviation ratio and first deviation ratio of the maximum value and the average value and second deviation ratio
Deviation ratio mean value of the mean value as corresponding data block.
In one embodiment of the invention, it in step (a4), is obtained according to the minimum deflection ratio mean value described
Abnormal lamp point detection threshold value meets formula: threshold=Th*deviation, and wherein threshold indicates the abnormal lamp
Point detection threshold value, Th is constant and value range is 1.0~2.0, and deviation indicates the minimum deflection ratio mean value.
In one embodiment of the invention, step (b) specifically includes: (b1) is stepped through described with the first traversal template
Multiple lamp point datas obtain the lamp point data that each lamp point data traverses the circle lamp point of template frame one relative to described first
The deviation ratio of mean value；And (b2) compare each lamp point data the deviation ratio and the abnormal lamp point detection threshold
Value, if when the deviation ratio of headlight point data is more than the abnormal lamp point detection threshold value, headlight point data pair is worked as in judgement
Abnormal lamp point is answered, if the deviation ratio on the contrary for working as headlight point data is less than the abnormal lamp point detection threshold value, is judged
When headlight point data corresponds to normal lamp point.
In addition, the abnormal lamp point in a kind of LED display correction that another embodiment of the present invention proposes detects compensation side
Method, comprising steps of obtaining the multiple lamp point datas for corresponding to the destination display area of LED display；By the multiple lamp point
Data are divided into multiple data blocks；Block-by-block calculates the deviation ratio mean value of each data block；More the multiple data block
The deviation ratio mean value is to obtain minimum deflection ratio mean value and obtain abnormal lamp point according to the minimum deflection ratio mean value
Detection threshold value；The position of abnormal lamp point data is detected from the multiple lamp point data according to the abnormal lamp point detection threshold value
And it records；And abnormal lamp lighting point data is corrected using the non-abnormal lamp point data in the part in the multiple lamp point data.
From the foregoing, it will be observed that the abnormal lamp point in the LED display correction that the embodiment of the present invention proposes detects compensation method,
It can be convenient quickly detection and compensate abnormal lamp point, acquisition data grading itself is avoided to influence；And it can be to avoid straightened up in place
The cumbersome local secondary correct operation of personnel avoids part and whole transition problem.
Through the following detailed description with reference to the accompanying drawings, other aspects of the invention and feature become obvious.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 process described herein.
Detailed description of the invention
Below in conjunction with attached drawing, specific embodiments of the present invention will be described in detail.
Fig. 1 traverses smooth brightness data for the embodiment of the present invention and is relevant to current lamp when abnormal lamp point position step to detect
The schematic illustration that the luminance deviation ratio of point calculates.
Fig. 2A and Fig. 2 B is that abnormal lamp point detects compensation effect front and back in LED display of embodiment of the present invention Luminance Distribution
Comparison chart.
Fig. 3 is the process of the abnormal lamp point detection compensation method in a kind of LED display correction of the embodiment of the present invention
Figure.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
The following embodiments of the present invention in the prior art due to acquisition blocks, the dirty point of camera etc. make LED display by
There is the problem of abnormal lamp point in point correction, propose the abnormal lamp point detection compensation method in a kind of LED display correction,
This method using the acquisition data distribution characteristic of destination display area (such as whole screen) generate adaptive departure judgment threshold (or
Claim abnormal lamp point detection threshold value), the local characteristics of abnormal lamp point are made full use of, traversal lamp point data searches for abnormal lamp point position,
Recycle local mean value replace work as headlight point value, so as to improve, even be eliminated the abnormal lamp point problem occurred in pointwise correction, should
Mode compared with the prior art in software algorithm processing mode take full advantage of local characteristics, not will receive acquisition data gradient
Influence, and compared with the prior art in local secondary correcting mode can also save the plenty of time, and effect is relatively stable.
Specifically, the abnormal lamp point in a kind of correction of LED display that the embodiment of the present invention proposes detects compensation method,
LED display therein can be LED display, can also be with other LED displays as LED box, even LED lamp panel
Deng specific implementation is as follows:
(i) the brightness data smothing filtering of destination display area
Smothing filtering is mainly the brightness data noise for removing the destination display area of acquisition, and common filtering mode has mean value
Filtering, median filtering, gaussian filtering etc..The lamp point that the larger difference with around is showed on the brightness data of acquisition includes two
Class: one kind is caused by itself production technology；One kind is the dirty point of image capture device such as camera or blocks caused by correction；The former belongs to
It should not be judged as abnormal lamp point in normal phenomenon, therefore the brightness data acquired carries out smothing filtering preferably to remove list
Spot noise, but filter template size and should not be too large to prevent from influencing abnormal lamp point, the present embodiment is filtered using 3*3 mean value template
Only removal single-point noise, template are as follows:
It is smooth to filter herein it is noted that going out all abnormal datas in the brightness data acquired to strict inspection
Wave process can be omitted.Furthermore, it is worth mentioning at this point that, destination display area herein can be the entire aobvious of LED display
Show region, is also possible to some subregion of partial display area such as LED display.
(ii) abnormal lamp point detection threshold value is calculated
The brightness data acquired to destination display area is carried out the smooth brightness data obtained after smothing filtering by the first step
It is divided into such as 16 pieces of muti-piece (the present invention is not limited thereto, but suggests being divided into nine pieces or more), block-by-block calculates bright
Spend minimum value min, brightness maxima max and average brightness aver；In addition, can only select every piece to accelerate calculating speed
1/4 data of the upper left corner of brightness data carry out operation approximation and replace monolith data.Further it will be understood that if LED display dress
It is set to double-colored or all-colour LED display device, then the brightness minimum value min of the smooth brightness data block of LED modules with different colors lamp point, bright
Degree maximum value max and average brightness aver needs are respectively calculated.
Second step, block-by-block calculate the deviation ratio ratio1 of brightness minimum value min and average brightness aver, brightness maximum
The deviation ratio ratio2 of value max and average brightness aver, then block-by-block calculate the deviation of deviation ratio ratio1 and ratio2
Ratio mean value aveRatio, wherein deviation ratio formula is as follows:
Ratio1=abs (min-aver)/aver
Ratio2=abs (max-aver)/aver
AveRatio=(ratio1+ratio2)/2
Third step, traversal compare the deviation ratio mean value aveRatio of 16 pieces of smooth brightness datas to obtain minimum deflection
Ratio mean value deviation, then to calculate abnormal lamp point detection threshold value as follows:
Threshold=Th*deviation
Wherein, threshold indicates abnormal lamp point detection threshold value, and coefficient T h is constant in formula and valid interval is preferably
1.0~2.0, such as Th=1.5.
(iii) traversal detects abnormal lamp point position
The first step steps through smooth brightness data, calculates when headlight lights angle value and template frame one encloses lamp point (as schemed
Shown in dotted line fill part in 1) luminance mean value deviation ratio.Here traversal template stock size is larger, to guarantee
Practical exception lamp point is located at the inside of traversal template, and the present embodiment traverses template using 30*30, but the present invention not as
Limit；
Second step, whether judgement is more than abnormal lamp point detection threshold value threshold when the deviation ratio of headlight point, if currently
The deviation ratio of lamp point is more than abnormal lamp point detection threshold value threshold, then when headlight point data is abnormal lamp point data, record
When headlight point position juxtaposition 1 is used as its testing result, otherwise when headlight point data is normal lamp point data (or non-abnormal lamp point
Data), record is used as its testing result when headlight point position juxtaposition 0.
(iv) abnormal lamp point brightness data is corrected
Step through the smooth brightness data of destination display area, if when headlight point position testing result be 1, with
In traversal template centered on headlight point, brightness data and meter corresponding to the lamp point position that all testing results are 0 are counted
Its mean value is calculated to be used as when headlight point corrects brightness value；If being skipped when the testing result of headlight point position is 0.It is worth mentioning
It is only to be wanted between the 30*30 traversal template referred in traversal template size and step (iii) herein without stringent corresponding relationship
Modulus version size is larger, and the present embodiment still can use 30*30 template size in step (iv).
Fig. 2A and Fig. 2 B is that abnormal lamp point detects compensation effect front and back in LED display of embodiment of the present invention Luminance Distribution
Comparison chart.Specifically, Fig. 2A is the intensity map before detection compensation, and the position that solid oval is marked at therein three is deposited
In abnormal lamp point；And Fig. 2 B is to detect compensated intensity map, and the different of the position of solid oval is marked at therein three
The brightness of normal lamp point is effectively corrected.
In addition, it is necessary to explanation, present invention is based on the brightness to collected destination display area
Detection and the luminance compensation of abnormal lamp point are realized in the processing of data, but the present invention is not limited thereto, are also based on to adopting
Detection and the chromatic compensation of the chroma data of the destination display area collected handled to realize abnormal lamp point, and it is well-known
, lamp point chroma data is typically indicated by two components in color space, therefore in the detection for realizing abnormal lamp point and
During chromatic compensation, need respectively to carry out each chromatic component the treatment process of similar aforementioned brightness data；In addition,
The present invention in other embodiments, can also be by the acquisition data (brightness and/or chroma data) by destination display area
The correction coefficient data being calculated is handled the detection and brightness of realizing abnormal lamp point and/or chromatic compensation, this is because
By taking monochromatic LED lamp point as an example, correction coefficient data is typically by a luminance component coefficient and two chromatic component coefficient structures
At.In addition, brightness data, chroma data and correction coefficient data are referred to as lamp point data herein for convenient for statement；Such one
Come, the abnormal lamp point detection compensation method in a kind of LED display correction that the embodiment of the present invention proposes can be summarized as such as Fig. 3
Shown in flow chart, detail can refer to preceding description, and details are not described herein.
In conclusion the abnormal lamp point in the LED display correction that the embodiment of the present invention proposes detects compensation method,
It can be convenient quickly detection and compensate abnormal lamp point, acquisition data grading itself is avoided to influence；And it can be to avoid straightened up in place
The cumbersome local secondary correct operation of personnel avoids part and whole transition problem.
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
It is right according to the technical essence of the invention for the equivalent embodiment of equivalent variations, but without departing from the technical solutions of the present invention
Any simple modification, equivalent change and modification made by above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (9)
1. the abnormal lamp point in a kind of LED display correction detects compensation method, which is characterized in that comprising steps of
(a) abnormal lamp point detection threshold value is obtained according to the multiple lamp point datas for the destination display area for corresponding to LED display；
(b) the multiple lamp point data is stepped through with the first traversal template and obtains each lamp point data relative to described first
Traverse in template the deviation of the mean value of multiple lamp point datas of designated position and by the deviation of each lamp point data and institute
It states abnormal lamp point detection threshold value and is compared position and record to detect abnormal lamp point；And
(c) the multiple lamp point data is stepped through with the second traversal template, and is counting institute when headlight point is exception lamp point
It states lamp point data corresponding to the normal lamp point in the second traversal template and calculates its mean value as the lamp point data for working as headlight point
Correction value.
2. exception lamp point as described in claim 1 detects compensation method, which is characterized in that the multiple lamp point data is smooth
Filtered lamp point data.
3. exception lamp point as described in claim 1 detects compensation method, which is characterized in that the LED display is aobvious for LED
Display screen, and the destination display area is entire display area or the partial display area of the LED display.
4. exception lamp point as described in claim 1 detects compensation method, which is characterized in that the multiple lamp point data is brightness
Data, chroma data or correction coefficient data.
5. exception lamp point as described in claim 1 detects compensation method, which is characterized in that step (a) specifically includes:
(a1) the multiple lamp point data is divided into multiple data blocks；
(a2) block-by-block calculates the deviation ratio mean value of each data block；
(a3) the deviation ratio mean value of more the multiple data block is to obtain minimum deflection ratio mean value；And
(a4) the abnormal lamp point detection threshold value is obtained according to the minimum deflection ratio mean value；
Wherein step (a2) specifically includes:
Block-by-block calculates minimum value, maximum value and the average value of the lamp point data in each data block；And
Block-by-block calculates the second of the first deviation ratio of the minimum value and the average value, the maximum value and the average value
Deviation ratio of the mean value of deviation ratio and first deviation ratio and second deviation ratio as corresponding data block
Example mean value.
6. exception lamp point as claimed in claim 5 detects compensation method, which is characterized in that the multiple in step (a1)
Data block is greater than or equal to nine data blocks.
7. exception lamp point as claimed in claim 5 detects compensation method, which is characterized in that in step (a4), according to described
Minimum deflection ratio mean value obtains the abnormal lamp point detection threshold value and meets formula: threshold=Th*deviation, wherein
Threshold indicates the abnormal lamp point detection threshold value, and Th is constant and value range is that 1.0~2.0, deviation is indicated
The minimum deflection ratio mean value.
8. exception lamp point as described in claim 1 detects compensation method, which is characterized in that step (b) specifically includes:
(b1) the multiple lamp point data is stepped through with the first traversal template and obtains each lamp point data relative to described the
One traversal template frame one encloses the deviation ratio of the mean value of the lamp point data of lamp point；And
(b2) compare each lamp point data the deviation ratio and the abnormal lamp point detection threshold value, if working as headlight point data
The deviation ratio be more than the abnormal lamp point detection threshold value, then judgement is when the corresponding abnormal lamp point of headlight point data, if otherwise
When the deviation ratio of headlight point data is less than the abnormal lamp point detection threshold value, then it is corresponding just to work as headlight point data for judgement
Normal lamp point.
9. the abnormal lamp point in a kind of LED display correction detects compensation method, which is characterized in that comprising steps of
Obtain the multiple lamp point datas for corresponding to the destination display area of LED display；
The multiple lamp point data is divided into multiple data blocks；
Block-by-block calculates the deviation ratio mean value of each data block；
The deviation ratio mean value of more the multiple data block is to obtain minimum deflection ratio mean value and according to the minimum
Deviation ratio mean value obtains abnormal lamp point detection threshold value；
Position and the note of abnormal lamp point data are detected from the multiple lamp point data according to the abnormal lamp point detection threshold value
Record；And
Abnormal lamp lighting point data is corrected using the non-abnormal lamp point data in the part in the multiple lamp point data；
Wherein the block-by-block calculates the step of deviation ratio mean value of each data block and specifically includes:
Block-by-block calculates minimum value, maximum value and the average value of the lamp point data in each data block；And
Block-by-block calculates the second of the first deviation ratio of the minimum value and the average value, the maximum value and the average value
Deviation ratio of the mean value of deviation ratio and first deviation ratio and second deviation ratio as corresponding data block
Example mean value.
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| CN106409197B (en) * | 2016-11-21 | 2020-05-19 | 西安诺瓦星云科技股份有限公司 | LED lamp panel fault detection method |
| CN109102466A (en) * | 2017-06-20 | 2018-12-28 | 杭州海康威视数字技术股份有限公司 | Image smear determination method and device |
| CN109300108B (en) * | 2018-07-27 | 2021-06-18 | 昆明理工大学 | Statistical and Gaussian-based day-surface brightness analysis method |
| CN110942738A (en) * | 2019-12-04 | 2020-03-31 | 惠州市华星光电技术有限公司 | Measurement device and measurement method for flicker value of display panel |
| CN112201203B (en) * | 2020-12-07 | 2021-02-19 | 卡莱特（深圳）云科技有限公司 | Method and device for determining brightness gradient error of LED display screen |
| CN112884681B (en) * | 2021-04-28 | 2021-09-17 | 卡莱特云科技股份有限公司 | Image shadow processing method and device, computer equipment and storage medium |
| CN114241959A (en) * | 2021-11-18 | 2022-03-25 | 浙江大华技术股份有限公司 | Abnormal light point detection method, display device and storage medium |
| CN114187866B (en) * | 2021-11-26 | 2023-11-14 | 江门市浩远科技有限公司 | Deep learning-based mini-led display control method and device |
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