CN106023883A - Local abnormal light point processing method after correction of LED display device - Google Patents
Local abnormal light point processing method after correction of LED display device Download PDFInfo
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- CN106023883A CN106023883A CN201610561411.7A CN201610561411A CN106023883A CN 106023883 A CN106023883 A CN 106023883A CN 201610561411 A CN201610561411 A CN 201610561411A CN 106023883 A CN106023883 A CN 106023883A
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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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- Physics & Mathematics (AREA)
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Abstract
The invention puts forward a local abnormal light point processing method after correction of an LED display device, comprising the following steps: collecting a monochromatic image of a local display area containing abnormal light points after correction of an LED display device to get a monochromatic local image, wherein the local display area is in a lighted state and the correction coefficient thereof is in an open state; processing the monochromatic local image to get light point collection data of the LED light points in the local display area, setting a segmentation threshold, and calculating the light point collection data deviation ratio point by point based on the segmentation threshold and the light point collection data; and reading the correction coefficient of the local display area, correcting the read correction coefficient based on the light point collection data deviation ratio to get a corrected correction coefficient, and applying the corrected correction coefficient to the local display area. Therefore, the problem of abnormal light points can be improved or even eliminated after correction.
Description
Technical field
The present invention relates to LED and show alignment technique field, particularly relate to the locality after the correction of a kind of LED display different
Often lamp point processing method.
Background technology
Along with the fast development of LED display pointwise correction technology, the work efficiency of correlation-corrected product, correction accuracy,
Stability is the most constantly promoted, thus enjoys the favorable comment of LED display manufacturer and user, but some correction scenes are still
Being likely to occur specific question, such as abnormal bright dim spot phenomenon, its producing cause has: 1) control system is abnormal；2) gatherer process blocks；
And 3) camera dirty some interference etc.；These factors all may result in the local pixel of collection image and are affected, so that
After correction, there is abnormal bright dim spot in LED display, badly influences user's viewing effect to LED screen body.
Therefore, person skilled has proposition correction pre-treatment scheme, is for camera lens dust or CCD stain
Situation, effective method be before correction by camera is carried out demarcate calibration or clean prevent LED display school
Abnormal bright dim spot occurs the most afterwards.But for some the most urgent correction at night scenes, utilize the equipment such as integrating sphere to enter
Rower is calibrated surely or to send cleaning shop to be carried out obviously the most unrealistic temporarily, the most inoperable.
Additionally, person skilled also has processing scheme in proposition correction, namely the camera still with band defect is carried out
Collection data are carried out Outlier Detection Algorithm process gathering during data calculate correction coefficient by LED display pointwise correction,
Local mean value is then utilized to be replaced process；Although in Jiao Zheng, processing scheme efficiency is high, but owing to not collecting abnormal lamp
Difference between point makes the uniformity between abnormal lamp point to lose, and is processed by local mean value replacement and also can only reduce defect
Overall difference with the point of lamp around.
Summary of the invention
Therefore, the abnormal lamp point problem after correcting based on prior art LED display, the present invention proposes a kind of LED and shows
Locality exception lamp point processing method after device correction, after it can solve LED display correction to a certain extent
Abnormal lamp point problem, so that pointwise correction uniformity consistency based on image collecting device such as area array cameras is carried
Rise, by the favorable comment of more wide variety of user.
Specifically, the locality exception lamp point process side after a kind of LED display correction that the embodiment of the present invention proposes
Method, including step: the monochrome image of the partial display area that (a) comprises abnormal lamp point after gathering LED display correction is to obtain
To monochromatic topography, wherein said partial display area is in illuminating state and its correction coefficient is in opening；B () is right
Described monochromatic topography carries out image procossing and gathers data with the lamp point obtaining the LED point of described partial display area, if
Determine segmentation threshold and combine described lamp point collection data with node-by-node algorithm lamp point collection data deviation ratio；And (c) reads institute
State the described correction coefficient of partial display area, utilize described lamp point gather data deviation ratio correction read correction coefficient with
Obtain revising post-equalization coefficient, and described correction post-equalization coefficient is applied to described partial display area.
In one embodiment of the invention, step (a) including: hacks described LED when gathering described monochrome image and shows
Showing device viewing area in addition to described partial display area.
In one embodiment of the invention, described LED display is LED display, and described partial display area is
Single case region.
In one embodiment of the invention, in step (b), described lamp point gathers data deviation ratio and meets piecewise function
And its value includes 1 and non-1 value.
In one embodiment of the invention, step (b) specifically includes: utilize following equation node-by-node algorithm lamp point to gather number
According to deviation ratio:
Wherein, (i, j) denotation coordination position is that (i, the lamp point of LED point j) gathers data deviation ratio, lum to ratio
(i, j) denotation coordination position is that (i, the lamp point of LED point j) gathers data, and Aver represents the LED of described partial display area
The lamp point of lamp point gathers the average of data, and T represents described segmentation threshold.
In one embodiment of the invention, step (c) utilizes described lamp point to gather data deviation ratio correction to read
Correction coefficient specifically include to obtain revising post-equalization coefficient: revise the correction coefficient of reading according to the following formula:
AmendCoef (i, j)=originCoef (i, j)/ratio (i, j)
Wherein, ratio (i, j) denotation coordination position be (i, the lamp point of LED point j) gathers data deviation ratio,
OriginCoef (i, j) represent read coordinate position be (i, the correction coefficient component of LED point j), amendCoef (i,
J) denotation coordination position is (i, the correction post-equalization coefficient component of LED point j).
In one embodiment of the invention, described lamp point gathers data is lamp point brightness data and/or lamp point colourity number
According to.
From the foregoing, it will be observed that the embodiment of the present invention (comprises abnormal lamp by the defect image of partial display area after acquisition correction
The image of the viewing area of point), then calculate defect image lamp point collection data deviation ratio, then utilize described lamp point to gather number
According to deviation ratio correction local lamp point calibration coefficient such that it is able to preferably improve the abnormal lamp point of even elimination after calibration and ask
Topic.
By the detailed description below with reference to accompanying drawing, the other side of the present invention and feature become obvious.But should know
Road, this accompanying drawing is only the purpose design rather than the restriction as the scope of the present invention explained.It should also be noted that it is unless another
Pointing out outward, it is not necessary to scale accompanying drawing, they only try hard to structure described herein and flow process are described conceptually.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is described in detail.
Figure 1A and Figure 1B is that the LED of the viewing area of a kind of 256*384 of having size of the embodiment of the present invention shows
Correction coefficient comparison design sketch before and after the abnormal lamp point process of device.
Fig. 2 is the stream of the locality exception lamp point processing method after a kind of LED display correction of the embodiment of the present invention
Cheng Tu.
Detailed description of the invention
Understandable, below in conjunction with the accompanying drawings to the present invention for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from
Detailed description of the invention be described in detail.
The following embodiment of the present invention is for the abnormal lamp point problem after the correction of prior art LED display, it is proposed that a kind of
Locality exception lamp point processing method after LED display correction, the method is comprised after being corrected by shooting LED display
The image of the partial display area of abnormal lamp point, then calculate partial display area lamp point brightness deviation ratio, then that brightness is inclined
Difference proportional action is on this partial display area lamp point calibration coefficient, thus can preferably solve the abnormal lamp point after correction and ask
Topic, although which operates more somewhat cumbersome, but can preferably preserve the uniformity between abnormal lamp point.
Specifically, the locality exception lamp point process side after a kind of LED display correction that the embodiment of the present invention proposes
Method, wherein LED display e.g. LED display, LED box even LED lamp panel, its specific implementation is as follows:
The monochrome image of the partial display area of abnormal lamp point is comprised after (i) acquisition correction
Correction coefficient is opened, by eye-observation exception lamp point institute after the correction of LED display whole viewing area
In position, hack the viewing area in addition to the partial display area of abnormal lamp point place, utilize image collecting device such as face battle array
The partial display area that camera alignment LED display is lighted, regulates suitable camera parameter, and shows with R, G, B all-colour LED
R, G, B monochrome image is shot respectively for device.Herein it is noted that for abnormal lamp point place partial display area
Selection principle, for LED display, often selects (namely the viewing area of a complete LED box, single case region for convenience
Territory)；Furthermore area array cameras needs to re-focuse for comparing LED display whole viewing area trimming process.Additionally it is worth
One is mentioned that, the determination of abnormal lamp point position is not limited to human eye vision, it is also possible to consider to use machine vision to carry out really
Fixed.Furthermore, the present embodiment opens correction coefficient can be on the correction coefficient of the whole viewing area of LED display, it is possible to
Only to open the correction coefficient of the partial display area at abnormal lamp point place.
(ii) the lamp point brightness deviation ratio of partial display area is calculated
R, G, B monochrome image of partial display area is carried out respectively the image procossing such as point location and lights to calculate LED
After angle value operation, setting segmentation threshold as the following formula node-by-node algorithm lamp point brightness deviation ratio:
Wherein, (i, j) denotation coordination position is (i, the luminance deviation ratio of LED point j), lum (i, j) table to ratio
Show that coordinate position is that (Aver represents the monochrome image LED point of described partial display area for i, the brightness value of LED point j)
Luminance mean value, T represents segmentation threshold, can also rule of thumb be manually set or other.Additionally, it is noted that point herein
Location, calculating LED point brightness value are existing mature technology, therefore do not repeat them here.And, herein it is understood that not
Separately calculate with the luminance deviation ratio of the LED point of color.
(iii) read the correction coefficient of partial display area, utilize the correction coefficient that luminance deviation ratio correction is read
School from the display control card of the LED display such as partial display area at receiving card retaking of a year or grade exception lamp point place
Positive coefficient, in conjunction with following formula calculating described partial display area R, the correction post-equalization coefficient luminance component of G, B LED point:
AmendCoef (i, j)=originCoef (i, j)/ratio (i, j)
Wherein, (i, j) denotation coordination position is (i, the luminance deviation ratio of LED point j), originCoef to ratio
(i j) represents that the coordinate position read is that ((i j) represents amendCoef for i, the correction coefficient luminance component of LED point j)
Coordinate position is (i, the correction post-equalization coefficient luminance component of LED point j).Follow-up correction post-equalization coefficient is applied to institute
State partial display area, namely be uploaded to control the hardware (such as receiving card) of described partial display area to update original school
Positive coefficient, then can reach the purpose of LED display locality exception lamp point process.
Seeing Figure 1A and Figure 1B, it is a kind of viewing area with 256*384 size of the embodiment of the present invention
Correction coefficient comparison design sketch before and after the abnormal lamp point process of LED display.Specifically, in figure ia, it is marked with solid line ellipse
There is abnormal lamp point in the position of circle, and Figure 1B is the correction after the locality exception lamp point processing method carrying out the embodiment of the present invention
Index profile, the correction coefficient of the abnormal lamp point being wherein marked with the position of solid oval is the most effectively revised；Furthermore,
For the LED display of the viewing area with 256*384 size, the partial display area at abnormal lamp point place big
Little such as elect 64*64 as.Herein it should be noted that size 256*384 and 64*64 are only for example, not it is used for limiting
The present invention.
It addition, it is noted that present invention considers that efficiency is come merely with the lamp point brightness data gathered
Correction correction coefficient luminance component is to process abnormal lamp point, but the present invention is not limited thereto, naturally it is also possible to utilize collection
Lamp point chroma data revises correction coefficient chromatic component to process abnormal lamp point；And it is well known that in color space lamp
Point chroma data is typically represented by two components, therefore at the correction coefficient chromatic component makeover process realizing abnormal lamp point
In, need respectively each chromatic component data to be carried out the processing procedure of similar aforementioned lamps point brightness data.Additionally, for ease of
Statement, is referred to as lamp point gathers data by lamp point brightness data and the lamp point chroma data of collection herein；Consequently, it is possible to the present invention
Locality exception lamp point processing method after a kind of LED display correction that embodiment proposes can be summarized as shown in Figure 2
Flow chart, detail refers to preceding description, does not repeats them here.
In sum, the locality exception lamp point processing method after the LED display correction that the embodiment of the present invention proposes,
Following beneficial effect can be reached: 1) preferably improve after calibration and even eliminate abnormal lamp point problem, any correction is on-the-spot all
Operable；And 2) ensure that the uniformity between local anomaly lamp point, and work as the bigger effect of area size that abnormal lamp point occupies
Fruit is prominent.
The above, be only presently preferred embodiments of the present invention, and the present invention not makees any pro forma restriction, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any technology people being familiar with this specialty
Member, in the range of without departing from technical solution of the present invention, when the technology contents of available the disclosure above makes a little change or modification
For the Equivalent embodiments of equivalent variations, as long as being without departing from technical solution of the present invention content, according to the technical spirit pair of the present invention
Any simple modification, equivalent variations and the modification that above example is made, all still falls within the range of technical solution of the present invention.
Claims (7)
1. the locality exception lamp point processing method after LED display correction, it is characterised in that include step:
The monochrome image of a partial display area that () comprises abnormal lamp point after gathering LED display correction is to obtain monochromatic office
Portion's image, wherein said partial display area is in illuminating state and its correction coefficient is in opening；
B () carries out image procossing to described monochromatic topography and adopts with the lamp point obtaining the LED point of described partial display area
Collection data, set segmentation threshold and combine described lamp point collection data with node-by-node algorithm lamp point collection data deviation ratio；And
C () reads the described correction coefficient of described partial display area, utilize described lamp point to gather data deviation ratio correction and read
The correction coefficient taken is to obtain revising post-equalization coefficient, and described correction post-equalization coefficient is applied to described partial display
Territory.
2. the locality exception lamp point processing method after LED display correction as claimed in claim 1, it is characterised in that
Step (a) including:
Described LED display viewing area in addition to described partial display area is hacked when gathering described monochrome image
Territory.
3. the locality exception lamp point processing method after LED display correction as claimed in claim 1, it is characterised in that
Described LED display is LED display, and described partial display area is single case region.
4. the locality exception lamp point processing method after LED display correction as claimed in claim 1, it is characterised in that
In step (b), described lamp point gathers data deviation ratio and meets piecewise function and its value includes 1 and non-1 value.
5. the locality exception lamp point processing method after LED display correction as claimed in claim 1, it is characterised in that
Step (b) specifically includes:
Utilize following equation node-by-node algorithm lamp point gather data deviation ratio:
Wherein, ratio (i, j) denotation coordination position be (i, the lamp point of LED point j) gathers data deviation ratio, lum (i,
J) denotation coordination position is that (i, the lamp point of LED point j) gathers data, and Aver represents the LED of described partial display area
The lamp point of point gathers the average of data, and T represents described segmentation threshold.
6. the locality exception lamp point processing method after LED display correction as claimed in claim 1, it is characterised in that
Step (c) utilize described lamp point gather the correction coefficient of data deviation ratio correction reading to obtain revising post-equalization coefficient tool
Body includes:
Revise the correction coefficient of reading according to the following formula:
AmendCoef (i, j)=originCoef (i, j)/ratio (i, j)
Wherein, ratio (i, j) denotation coordination position be (i, the lamp point of LED point j) gathers data deviation ratio,
OriginCoef (i, j) represent read coordinate position be (i, the correction coefficient component of LED point j), amendCoef (i,
J) denotation coordination position is (i, the correction post-equalization coefficient component of LED point j).
7. the locality exception lamp point processing method after LED display correction as claimed in claim 1, it is characterised in that
It is lamp point brightness data and/or lamp point chroma data that described lamp point gathers data.
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