CN105405392B - Bright chroma disparity compensation method in by stages in LED display Subarea calibration - Google Patents
Bright chroma disparity compensation method in by stages in LED display Subarea calibration Download PDFInfo
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- CN105405392B CN105405392B CN201510889893.4A CN201510889893A CN105405392B CN 105405392 B CN105405392 B CN 105405392B CN 201510889893 A CN201510889893 A CN 201510889893A CN 105405392 B CN105405392 B CN 105405392B
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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 by stages bright chroma disparity compensation method in LED display Subarea calibration, its light tone angle value according to each correction subregion of integration region (or public domain) adjustment and the difference between reservation correction subregion and correction subregion, so that each correction multi-section display effect reaches unanimity after correction, therefore can solve in actual Subarea calibration due to shooting angle, camera distance, the factors such as data stability cause the bright chroma average of each subregion collected inconsistent with actual light tone angle value so that each after correction correct the problem of multi-section display effect is inconsistent.
Description
Technical field
The present invention relates to LED display alignment technique field, by stages in more particularly to a kind of LED display Subarea calibration
Bright chroma disparity compensation method.
Background technology
Since 21 century, colour shows that industry is developed on an unprecedented scale, and LED display has also been almost spread in all cities
Heart square, commercial mansion.LED display with its it is distinctive bright in luster, visual high, low in energy consumption the advantages that enjoy people good
Comment, it is more low yet with current LED display manufacturing technology level so that the LED produced itself exists larger
Bright chroma difference (such as same production batch LED, its brightness may differ by nearly 50%, and colourity may differ by 15~20nm),
And the display screen of multiple different production batch LED splicings, its bright chroma difference are just more serious.These bright chroma differences for
It is intolerable for human eye vision, so LED display that is new production or using year in year out needs to carry out effective light tone
Degree regulation.
Mainly there are two kinds for the LED display processing mode that bright chroma difference be present in LED display industry at present：1)
LED display is corrected using the measuring apparatus combination point-to-point correction system such as camera, chromascope, between elimination LED point
Bright chroma difference, reach the high uniformity uniformity of LED display bright chroma.Although the device measuring such as camera, chromascope school
Forward efficiency is very high, but its measurement accuracy will be less than human visual system, so being directly over the LED display of pointwise correction
Still it may can perceive slight bright chroma difference；2) the manual regulative mode based on human eye vision, is sentenced by eye-observation
The bright chroma difference of disconnected LED display, and then correction target value is manually set, adjust LED point using the means of similar correction
Penalty coefficient so that LED display seems bright chroma uniformity.Although this manual regulative mode can reach human eye
Vision requirement, but its regulation efficiency is very low, increases regulation significantly and expends the time, it is difficult to meet actual application need
Ask.
In LED display correction, it is sometimes desirable to which using Subarea calibration, for example screen body resolution ratio is larger, once full frame school
Meet demand is just unable to, so selection Subarea calibration.Subarea calibration is exactly that screen body is divided into multiple regions, every time only correction one
Region, correct single subregion be can with dot interlace gather view data, can not also dot interlace, as the case may be depending on.Fig. 1 is shown
Screen body is divided into the schematic diagram of 4*4 subregion.
During Subarea calibration, it will usually problems be present：Due to shooting angle, camera distance, data stability
Etc. factor, cause even actually each average light tone angle value of correction subregion is consistent, the light tone angle value collected may also differ
The phenomenon of cause.For such a problem, a kind of solution method that prior art proposes is the correction subregion light tone angle value that will be collected
All it is normalized to unanimously, i.e., the average light tone angle value of each correction subregion of acquiescence is consistent.If however, each correct the average light tone of subregion
Angle value is actually just inconsistent, then being all normalized to each correction subregion bright chroma can unanimously go wrong.
The content of the invention
Therefore, to overcome in the prior art the defects of and deficiency, the present invention propose to divide in a kind of LED display Subarea calibration
Section bright chroma disparity compensation method.
Specifically, the embodiment of the present invention proposes by stages bright chroma disparity compensation side in a kind of LED display Subarea calibration
Method, including step：(a) the of adjoining the first correction subregion for corresponding to the first correction subregion and the second correction subregion is obtained
First collection image of one borderline region, wherein first borderline region is the composition part of the described second correction subregion and bag
Containing multiple LED points；(b) adjoining second school for corresponding to the described second correction subregion and the first correction subregion is obtained
The second collection image in the second boundary region of positive subregion, wherein the second boundary region is the structure of the described first correction subregion
An integration region is formed into part and comprising multiple LED points, first borderline region and the second boundary region；
(c) analyzed to obtain the bright chroma average of the integration region as the first bright chroma average to the described first collection image；
(d) analyzed to obtain the bright chroma average of the integration region as the second bright chroma average to the described second collection image；
(e) the adjustment system of the second correction subregion is gone out using the first bright chroma average and the second bright chroma mean value computation
Number；And (f) utilizes the light tone angle value of each LED point in regulation coefficient regulation the second correction subregion.
In one embodiment of the invention, first borderline region and the second boundary region have equal
LED point ranks number.
In addition, by stages bright chroma difference is mended in a kind of LED display Subarea calibration that another embodiment of the present invention proposes
Compensation method, including step：(i) obtain one first collection image for corresponding to the first viewing area and correspond respectively to multiple
Multiple second collection images of second viewing area, wherein first viewing area includes the first correction subregion, each institute
State the second viewing area and include the second correction subregion, and first viewing area and each second viewing area part
It is overlapping and there is a public domain；(ii) to described first collection image and it is described multiple second collection images analyzed with
Obtain two bright chroma averages of each public domain；(iii) two bright chroma averages of each public domain are calculated
Ratio with obtain it is described first correction subregion multiple independent regulation coefficients；(iv) calculated using the multiple independent regulation coefficient
Go out the unified regulation coefficient of the first correction subregion；And (v) utilizes unified regulation coefficient regulation first correction
The light tone angle value of each LED point in subregion.
In one embodiment of the invention, it is described to calculate the first correction subregion using multiple independent regulation coefficients
Unified regulation coefficient include using the average value of the multiple independent regulation coefficient as the unified regulation coefficient.
From the foregoing, it will be observed that light tone angle value of the embodiment of the present invention according to each correction subregion of integration region (public domain) adjustment
And retain correction subregion and correct the difference between subregion, so that each correction multi-section display effect tends to one after correction
Cause, solve in actual Subarea calibration due to the factors such as shooting angle, camera distance, data stability cause to collect it is each
The bright chroma average of subregion is inconsistent with actual light tone angle value so that each correction multi-section display effect is inconsistent after correction
The problem of.
By the detailed description below with reference to accompanying drawing, other side of the invention and feature become obvious.But it should know
Road, the accompanying drawing is only the purpose design explained, not as the restriction of the scope of the present invention.It is it should also be noted that unless another
Point out outside, it is not necessary to which scale accompanying drawing, they only try hard to conceptually illustrate structure and flow described herein.
Brief description of the drawings
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
Fig. 1 shows that LED display is divided into 4*4 correction subregion.
Fig. 2 shows two adjacent correction subregions.
Fig. 3 shows that LED display is divided into 4*4 correction subregion and has indicated the integration region of each correction subregion.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail.
Due to factors such as shooting angle, camera distance, data stability when the present invention is for Subarea calibration in the prior art
The average light tone angle value for each correction subregion for causing to collect is inconsistent with actual light tone angle value so that each after correction
The problem of multi-section display effect is inconsistent is corrected, proposes a kind of bright chroma difference between correction subregion is solved according to integration region
Method, so that each correction multi-section display effect reaches unanimity after correction.
Specifically, in each correction subregion collection image, it can be gathered more and abut the one fixed width borderline region of subregion.
Exemplified by shown in Fig. 2, it is assumed that screen body is divided into two correction subregions, namely correction subregion 1 and correction subregion 2；Correction subregion 1 is entered
, can borderline region B and acquisition correction subregion 1 He of the control point bright corrected subregion 1 with its adjoining correction subregion 2 during row IMAQ
Borderline region B display image (or display image of the second viewing area of collection)；Similarly, figure is carried out to correction subregion 2
, can borderline region A and acquisition correction subregion 2 and border of the control point bright corrected subregion 2 with its adjacent correction subregion 1 during as collection
Region A display image (or display image of the first viewing area of collection)；As can be seen here, to correction subregion 1 and correction point
When area 2 carries out IMAQ, borderline region A and borderline region B (namely the first viewing area and the second viewing area are all acquired
The public domain formed because partly overlapping), namely acquire identical integration region (i.e. borderline region A+ borderline region B).
Preferably, borderline region A and borderline region B has equal LED point ranks number.
Below by the side of bright chroma difference between a kind of solution subregion according to integration region proposed to the embodiment of the present invention
Method, implementation step are as follows：
The first step：Any one correction subregion in multiple correction subregions of LED display is selected as initial calibration point
Area carries out IMAQ, subsequently using this initial calibration subregion as standard.
Second step：The selection of current subregion to be corrected for carrying out IMAQ is conditional, namely selection has corrected point
Area it is adjacent (such as：Upper and lower, left and right) region.
By taking Fig. 2 as an example, it is assumed that selection correction subregion 1 is used as initial calibration subregion, and correction subregion 2 is used as subregion to be corrected；
If the bright chroma average that the integration region of initial calibration subregion 1 collects is value1, its adjacent current subregion 2 to be corrected is right
The bright chroma average that the integration region answered collects is value2, and value1 and value2 is, for example, by tristimulus values XYZ herein
Represent, but the present invention is not limited thereto, and it can also be represented by Lxy color model.
Because the factors such as shooting angle, camera distance, data stability influence, usual value1 is not equal to value2.So
And the reason for will not being changed according to the actual bright chroma of integration region, i.e., value1 in theory should be equal to value2, therefore will
Value2 normalizings are to value1.
Next, calculate the regulation coefficient ratio=value1/value2 of current subregion 2 to be corrected；
Then, regulation coefficient ratio is applied to the light tone degrees of data of whole current subregion 2 to be corrected, i.e. correction point
The light tone angle value of each LED point in area 2 is multiplied by regulation coefficient ratio, so as to obtain the tune of current subregion 2 to be corrected
Light tone degrees of data after whole, and remain the difference between subregion and subregion.
Referring to Fig. 3, it illustrates LED display is divided into 4*4 correction subregion and has indicated each correction subregion
Integration region (oblique line filling region as shown in Figure 3).
In fig. 3, it is assumed that be that correction subregion 6, correction subregion 7 and correction subregion 11 are to have corrected subregion, correction subregion 2,
Correction subregion 3, correction subregion 5, correction subregion 8, correction subregion 10, correction subregion 12 and correction subregion 15 it is current have it is adjacent
Correct subregion thus be selectable as current subregion to be corrected, correction subregion 1, correction subregion 4, correction subregion 9, correction subregion
13rd, correct subregion 14 and correction subregion 16 it is current without the adjacent subregion of correction thus be not selected as temporarily it is current to be corrected
Subregion.
Carried out exemplified by correction subregion 10 in Fig. 3 is calculated into its regulation coefficient ratio as current subregion to be corrected below
Explanation：
1) the bright chroma average for having corrected the integration region positioned at downside of subregion 6 is designated as (under value6), currently treats school
Integration region side disposed thereon corresponding to positive subregion 10 and its bright chroma average is designated as (on value10), then independent regulation coefficient
Ratio1=(under value6)/(on value10)；
2) the bright chroma average for having corrected the integration region positioned at left side of subregion 11 is designated as (value11 is left), currently treats
Integration region corresponding to correction subregion 10 is located at its right side and its bright chroma average record (value10 is right), then independent adjustment system
Number ratio2=(value11 is left)/(value10 is right)；
3) ask for the unified regulation coefficient ratio of current subregion 10 to be corrected, its be independent regulating system ratio1 and
Raito2 average, therefore unified regulation coefficient raito=(ratio1+ratio2)/2；
4) and then by the ratio apply to the light tone degrees of data of current subregion 10 to be corrected, that is, correct each in subregion 10
The light tone angle value of individual LED point is multiplied by regulation coefficient ratio.
It can be learnt by the explanation above relative to Fig. 3：For current subregion to be corrected, if its exist it is multiple adjacent
Subregion has been corrected, then can correspondingly calculate multiple independent regulation coefficients corresponding to multiple integration regions difference, and in order to ask for uniting
One regulation coefficient, it is proposed that use the method averaged, naturally it is also possible to using other method, for example seek intermediate value etc..
Hold above-mentioned, utilizing the correction subregion (initial calibration point each to LED display of regulation coefficient corresponding to integration region
Except area) enter line brightness/chrominance value adjustment after, can be according to the light tone of obtained each correction subregion (including initial calibration subregion)
The LED of each correction subregion of degrees of data generation LED display lights chromaticity correction coefficient and on application to screen body, so that screen body
Overall show uniformity seems to reach unanimity.As for according to light tone degrees of data generate bright chroma correction coefficient method be existing
Some mature technologies, will not be repeated here.
In summary, light tone angle value and reservation of the above embodiment of the present invention according to each correction subregion of integration region adjustment
Difference between subregion and subregion, so that each correction multi-section display effect reaches unanimity after correction, solve actual point
Because the factors such as shooting angle, camera distance, data stability cause the light tone of each correction subregion that collects in area's correction
Spend average and actual light tone angle value is inconsistent so that each after correction correct the problem of multi-section display effect is inconsistent.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
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 being the technical spirit pair according to the present invention without departing from technical solution of the present invention content
Any simple modification, equivalent change and modification that above example is made, in the range of still falling within technical solution of the present invention.
Claims (4)
1. a kind of bright chroma disparity compensation method in by stages in LED display Subarea calibration, it is characterised in that including step：
Obtain the first borderline region of adjoining the first correction subregion for corresponding to the first correction subregion and the second correction subregion
First collection image, wherein first borderline region be described second correction subregion composition part and include multiple LED
Lamp point；
Obtain the second of adjoining the second correction subregion for corresponding to the described second correction subregion and the first correction subregion
Borderline region second collection image, wherein the second boundary region be described first correction subregion composition part and comprising
Multiple LED points, first borderline region and the second boundary region form an integration region；
Analyzed to obtain the bright chroma average of the integration region as the first bright chroma average to the described first collection image；
Analyzed to obtain the bright chroma average of the integration region as the second bright chroma average to the described second collection image；
Go out the adjustment system of the second correction subregion using the first bright chroma average and the second bright chroma mean value computation
Number；And
Utilize the light tone angle value of each LED point in regulation coefficient regulation the second correction subregion.
2. by stages bright chroma disparity compensation method, its feature exist in LED display Subarea calibration as claimed in claim 1
In first borderline region and the second boundary region have equal LED point ranks number.
3. a kind of bright chroma disparity compensation method in by stages in LED display Subarea calibration, it is characterised in that including step：
Obtain one first collection image for corresponding to the first viewing area and correspond respectively to multiple second viewing areas
Multiple second collection images, wherein first viewing area includes the first correction subregion, each described second viewing area
Comprising the second correction subregion, and first viewing area partly overlaps with each described second viewing area and has one
Public domain, wherein, the second correction subregion is to have corrected subregion；
Described first collection image and multiple described second collection images are analyzed to obtain the two of each public domain
Individual bright chroma average；
The ratio of two bright chroma averages of each public domain is calculated to obtain multiple independences of the first correction subregion
Regulation coefficient；
The unified regulation coefficient of the first correction subregion is calculated using the multiple independent regulation coefficient；And
Utilize the light tone angle value of each LED point in unified regulation coefficient regulation the first correction subregion.
4. by stages bright chroma disparity compensation method, its feature exist in LED display Subarea calibration as claimed in claim 3
In calculating the unified regulation coefficient of the first correction subregion including will be the multiple using the multiple independent regulation coefficient
The average value of independent regulation coefficient is as the unified regulation coefficient.
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