CN105185314A - Uniformity compensation method for LED display screen - Google Patents
Uniformity compensation method for LED display screen Download PDFInfo
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- CN105185314A CN105185314A CN201510669429.4A CN201510669429A CN105185314A CN 105185314 A CN105185314 A CN 105185314A CN 201510669429 A CN201510669429 A CN 201510669429A CN 105185314 A CN105185314 A CN 105185314A
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Abstract
The invention relates to a uniformity compensation method for an LED display screen, and the method obtains a single-primary-color full-bright image and a dot interlace image, which are obtained through image collection equipment, such as a CCD camera. During photographing, the position of the CCD camera remains unchanged. The single-primary-color full-bright image is used for obtaining the primary-color image brightness, and the main purpose of the dot interlace image is positioning. The method comprises the steps: obtaining target brightness, enabling the brightness of each statistics unit to be adjusted to the target brightness, and finally achieving the consistency of a target display region of the LED display screen, such as the brightness consistency of the whole screen. Therefore, through obtaining the dot interlace image and combing dot positioning, the method obtains the brightness information of each statistics unit, and finally adjusts the brightness of the target display region of the LED display screen to the same brightness, such as the full-screen brightness, so the method can improve the display quality of the LED display screen.
Description
Technical field
The present invention relates to LED display control technology field, particularly a kind of LED display uniformity compensation method.
Background technology
LED display is normally spliced by multiple module, along with the development of current LED display alignment technique, the show uniformity problem of LED display can be solved preferably, but many times can there is the module that some bright chroma differ greatly in LED display screen body inside, conventional correction methods cannot eliminate the bright chroma difference between module completely, still may there is luminance difference in the LED display screen body after correction, especially when LED screen is made up of multiple batches of module, difference can be more obvious; In addition, if side has other light sources to disturb when correcting, collect the bright chroma data distortion of disturbed part, after also may causing correction, still there is bright chroma difference.
At present also do not propose good solution for the LED display that can there is luminance difference after correcting, can only control module when building LED display screen body be with batch with the brightness uniformity after ensureing correction as far as possible.But requirement just ensures that when LED display screen body is built module is for same batch, underaction when can cause building LED display, and for LED display lessor, be difficult to ensure that module is for same batch, is therefore difficult to solve this kind of luminance difference problem from root.
Summary of the invention
Therefore, for defect of the prior art and deficiency, the present invention proposes a kind of LED display uniformity compensation method.
Particularly, a kind of LED display uniformity compensation method that one embodiment of the present of invention propose, comprise step: (i) obtains the complete bright image of single primary colours of target viewing area corresponding to LED display, the complete bright image of wherein said single primary colours is by control to light in described target viewing area as all LED points of same color and carry out image acquisition and obtain; (ii) a dot interlace image of the described target viewing area corresponding to described LED display is obtained, wherein, described target viewing area virtual grate has multiple statistic units of repeated arrangement along the line of the column direction, statistic unit described in each comprises multiple LED pixel, LED pixel described in each comprises the LED point of a LED point or multiple different colours, and described dot interlace image lights the same color LED point of a LED pixel of same position in statistic unit described in each by control and carries out image acquisition and obtain; (iii) zone location and point location are carried out to obtain the positional information of the regional frame corresponding in described dot interlace image of statistic unit described in each to described dot interlace image; (iv) positional information of described regional frame corresponding in described dot interlace image for statistic unit described in each is applied in the complete bright image of described single primary colours to count the brightness value of the brightness statistics value in the regional frame corresponding in the complete bright image of described single primary colours of statistic unit described in each as described statistic unit; And (v) using the ratio of target brightness value and the brightness value of statistic unit described in each as the luminance compensation coefficient of described statistic unit to act on the complete bright image of corresponding described single primary colours in described statistic unit and there is the brightness correction coefficients of all LED points of described same color.
In one embodiment of the invention, the complete bright image of the described single primary colours in step (i) is by controlling light all red LED lamp points in described target viewing area, all green LED lamp point or described blue led lamp point and carry out image acquisition and obtain.
In one embodiment of the invention, the described dot interlace image in step (ii) is by controlling light the red LED lamp point of a LED pixel of same position in statistic unit described in each, green LED lamp point, blue led lamp point or its combination in any and carry out image acquisition and obtain.
In one embodiment of the invention, carry out zone location to described dot interlace image in step (iii) to comprise: carry out zone location to obtain zone location scope to the complete bright image of described single primary colours; And by described zone location range applications in described dot interlace image to realize zone location to described dot interlace image.
In one embodiment of the invention, the described dot interlace image in step (i) lights in statistic unit described in each the same color LED point of the LED pixel being in center by control and carries out image acquisition and obtain; Correspondingly, described step (iii) comprises and carries out point location to obtain the Geometric center coordinates of the described regional frame corresponding in described dot interlace image of statistic unit described in each to described dot interlace imagery exploitation grey scale centre of gravity method.
In one embodiment of the invention, the described brightness value of statistic unit described in each in step (iv) is the brightness value sum of all image pixels in the regional frame of described statistic unit correspondence in the complete bright image of described single primary colours.
In one embodiment of the invention, the described target brightness value in step (v) is the mean value of the described brightness value of a designated statistics unit in described multiple statistic unit of described target viewing area or the described brightness value for described multiple statistic unit of described target viewing area.
In one embodiment of the invention, described target viewing area is the whole viewing area of described LED display.
In one embodiment of the invention, described LED display comprises multiple casing, the width of casing described in each and be highly respectively the width of described statistic unit and the integral multiple of height.
In one embodiment of the invention, described LED display comprises multiple LED lamp panel, the width of LED lamp panel described in each and be highly respectively the width of described statistic unit and the integral multiple of height.
As from the foregoing, the embodiment of the present invention is by obtaining dot interlace image, binding site location obtains the monochrome information of each statistic unit, and the target viewing area such as whole-screen brightness of LED display is adjusted in same brightness by final realization, thus can improve the display quality of LED display.
By the detailed description below with reference to accompanying drawing, other side of the present invention and feature become obvious.But it should be known that this accompanying drawing is only the object design of explanation, instead of as the restriction of scope of the present invention.Should also be appreciated that, unless otherwise noted, unnecessaryly draw accompanying drawing to scale, they only try hard to structure described herein and flow process are described conceptually.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Fig. 1 is a dot interlace image of the LED display being relevant to the embodiment of the present invention.
Fig. 2 carries out the schematic diagram after zone location to the complete bright image of single primary colours of the LED display of the embodiment of the present invention.
Fig. 3 is for carrying out the schematic diagram after point location to the image of dot interlace shown in Fig. 1.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Below for red-green-blue LED display, a kind of LED display uniformity compensation method that the embodiment of the present invention proposes is described; A kind of typical apply of the LED display uniformity compensation method of the present embodiment is after LED display being carried out to full frame pointwise correction (can be that gamma correction or bright chroma correct).
The basic ideas of the LED display uniformity compensation method of the present embodiment are: obtain and use image capture device such as CCD camera to take four images obtained, namely red, green, blue complete bright image each one and dot interlace image one, will keep CCD camera invariant position in shooting process; Wherein, three single primary colours (red, green, blue) complete bright image is the brightness of image in order to obtain often kind of primary colours, and the fundamental purpose of dot interlace image is location; Then determine an object brightness, by the brightness adjustment of each statistic unit to object brightness, finally realize LED display target viewing area such as whole-screen brightness consistent.Concrete steps are as follows:
A () obtains the complete bright image of single primary colours of the such as whole viewing area (or claiming full frame), target viewing area corresponding to LED display, the complete bright image of single primary colours is herein red, green, blue each one of complete bright image; More specifically, the complete bright image of single primary colours is by control to light in target viewing area as all LED points of same color and carry out image acquisition (such as CCD camera image taking) and obtain, and also namely red, green, blue complete bright image is all red LED lamp points, all green LED lamp point and all blue led lamp points lighted in target viewing area by control respectively and carries out image acquisition and obtain.
B () obtains the dot interlace image of the target viewing area corresponding to LED display.Herein, the target viewing area virtual grate of LED display has along the line of the column direction the statistic unit of multiple statistic units such as 8*8 size of (or claiming width and short transverse) repeated arrangement, each statistic unit comprises multiple LED pixel (such as 8*8 LED pixel), LED pixel described in each such as comprises redness, green and blue led lamp point, and dot interlace image lights the same color LED point of a LED pixel of same position in each statistic unit by control and carries out image acquisition and obtain; The LED point lighted by control corresponding to dot interlace image can be red LED lamp point, green LED lamp point, blue led lamp point or its combination in any.Preferably, for the ease of the position of quick obtaining statistic unit regional frame of correspondence in the complete bright image of single primary colours, the LED point lighted by control corresponding to dot interlace image is the LED point be in each statistic unit in a LED pixel of center; It is worth mentioning that herein, for statistic unit width and be highly the situation of even number, then the LED pixel being in center has four, then can be any one in these four by the LED pixel controlling to light; In like manner, for the situation of the width of statistic unit and height one to be odd number another one be even number, then the LED pixel being in center has two, then can be any one in these two by the LED pixel controlling to light.
As for statistic unit size, the width of the target viewing area ensureing LED display and height (with LED pixel count gauge) is needed to be the width B lockSize of statistic unit respectively
widthwith height B lockSize
heightintegral multiple.In addition, the determination mode of statistic unit size can be: with BlockSize
heightfor example, first make BlockSize
heightbe an initial value such as 8, if the height of the target viewing area of LED display is not the integral multiple of 8, then at BlockSize
height∈ { determines BlockSize between 9,10,11,12,13,14,15}
heightsize, if still do not meet integral multiple requirement, then at BlockSize
height∈ { determines BlockSize between 1,2,3,4,5,6,7}
heightsize.
C () carries out graphical analysis to obtain the positional information of each statistic unit regional frame corresponding in dot interlace image to dot interlace image.Specifically can be: point location is carried out to dot interlace imagery exploitation grey scale centre of gravity method, and in order to the accuracy of point location, the complete bright image of single primary colours can be utilized before point location to carry out zone location; And then in the scope of zone location, also namely point location is carried out to dot interlace image, as the white box in Fig. 3 in ABCD rectangular area as shown in Figure 2.Herein, under the situation of LED point being the LED pixel of the center being in each statistic unit by the LED point controlling to light corresponding to dot interlace image, the grey scale centre of gravity coordinate utilizing grey scale centre of gravity method to calculate is the Geometric center coordinates of point location regional frame (white box in Fig. 3), also be the Geometric center coordinates of the regional frame that each statistic unit is corresponding in dot interlace image, thus the positional information of each statistic unit regional frame corresponding in dot interlace image can be obtained.In addition, it is worth mentioning that, because the complete bright image of single primary colours and dot interlace image carry out image acquisition to same target viewing area and obtain under the prerequisite keeping CCD camera invariant position, therefore zone location is carried out to the complete bright image of single primary colours and the zone location scope (the ABCD rectangular area in Fig. 2) that obtains should be consistent with the zone location scope of dot interlace image.Being prior art as carrying out the image analysis algorithm such as zone location and point location to image, not repeating them here.
D () obtains the brightness value of each statistic unit.For the complete bright image of green, the positional information of regional frame corresponding in dot interlace image for each statistic unit obtained according to step (c) is applied to green complete bright image, the position of each statistic unit regional frame corresponding in the complete bright image of green can be obtained; Count the brightness value Bright of the brightness statistics value in each statistic unit regional frame corresponding in the complete bright image of green respectively as each statistic unit afterwards.Herein, the brightness value Bright of each statistic unit is the brightness value sum of all image pixels in regional frame that this statistic unit is corresponding in the complete bright image of green, such as green component values sum; Or described brightness value sum is divided by the quotient of the LED pixel quantity in this statistic unit.
E () calculates luminance compensation coefficient, eliminate luminance difference.Be specially: first determine an object brightness, then the brightness value of each statistic unit is adjusted to object brightness, final realization eliminates target viewing area such as whole-screen brightness difference, and it can comprise following step:
Determine object brightness Bright
standard, wherein object brightness Bright
standardselection mainly in order to by brightness unification such as full frame for target viewing area on a gray scale, therefore it selects not restriction, and the brightness value of single statistic unit can be selected as object brightness Bright
standardor the mean value of the brightness value of each statistic unit is as object brightness Bright
standard, also artificially can define an experience brightness value as object brightness Bright
standard.
To analyze green complete bright image, suppose that the brightness value Bright of the statistic unit selecting the first row first row is as object brightness Bright
standard, if statistic unit size BlockSize=8*8 is unified to object brightness Bright with the brightness value of the statistic unit by the first row secondary series
standardfor example:
The brightness value of the statistic unit of the first row first row is Bright
(1,1), namely have Bright
standard=Bright
(1,1);
The brightness value of the statistic unit of the first row secondary series is Bright
(1,2);
Calculate the brightness value Bright of current statistic unit
(1,2)be transformed into Bright
standardtime corresponding luminance compensation coefficient Coef
compensation, it meets formula: Coef
compensation=Bright
standard/ Bright
(1,2);
Afterwards by luminance compensation coefficient Coef
compensationbe applied in the green principal component of correction coefficient of each green LED lamp point of 8*8 corresponding to a current statistic unit LED pixel, if the green principal component of the correction coefficient of some green LED lamp point is Coef
green, then carrying out the green principal component of the correction coefficient after luminance compensation is: Coef
green× Coef
compensation.
In like manner, to the luminance compensation of the green principal component of the correction coefficient of the green LED lamp point of other statistic units and the statistic unit of the first row secondary series similar, then the brightness of the green component of final goal viewing area arrives in same brightness.
For each statistic unit of the complete bright image of redness and the complete bright image of blueness, process according to the disposal route identical with the complete bright image of above-mentioned green, finally can by brightness adjustment such as full frame for target viewing area on an identical gray scale.
In addition, be understandable that, above-described embodiment be to the brightness unification of each statistic unit on same gray scale, in like manner also can unify colourity difference.In addition, for the luminance compensation of red, green, blue complete bright image, be not limited to the only shooting dot interlace image described in above-described embodiment, also for the complete bright image of each single primary colours, the dot interlace image of corresponding color can be taken respectively.Moreover, in above-described embodiment, although the width of configuration statistic unit and highly respectively with the width of the such as whole viewing area, target viewing area of LED display with highly meet integral multiple relation and can meet the precision of calculating, but in order to improve the precision of luminance compensation further, a statistic unit is avoided to comprise the LED point of two casings, the width of statistic unit and highly can be configured to respectively with the width of casing with highly meet integral multiple relation, it is certainly also respectively with the width of the whole viewing area of LED display with highly meet integral multiple relation.In like manner, can also configure statistic unit width and highly respectively with the width of LED lamp panel with highly meet integral multiple relation, it is certainly also respectively with the width of casing with highly meet integral multiple relation and with the width of the whole viewing area of LED display with highly meet integral multiple relation, this is because the screen body of LED display can be formed by one or more box body splicing, and single casing can be spliced by one or more LED lamp panel.
In sum, the embodiment of the present invention is by dot interlace image taking, binding site location obtains the monochrome information of each statistic unit, the target viewing area such as whole-screen brightness of LED display is adjusted on same gray scale by final realization, thus can effectively eliminate the luminance difference correcting uniform LED display and exist, improve the display quality of LED display greatly.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. a LED display uniformity compensation method, is characterized in that, comprises step:
I () obtains the complete bright image of single primary colours of target viewing area corresponding to LED display, the complete bright image of wherein said single primary colours is by control to light in described target viewing area as all LED points of same color and carry out image acquisition and obtain;
(ii) a dot interlace image of the described target viewing area corresponding to described LED display is obtained, wherein, described target viewing area virtual grate has multiple statistic units of repeated arrangement along the line of the column direction, statistic unit described in each comprises multiple LED pixel, LED pixel described in each comprises the LED point of a LED point or multiple different colours, and described dot interlace image lights the same color LED point of a LED pixel of same position in statistic unit described in each by control and carries out image acquisition and obtain;
(iii) zone location and point location are carried out to obtain the positional information of the regional frame corresponding in described dot interlace image of statistic unit described in each to described dot interlace image;
(iv) positional information of described regional frame corresponding in described dot interlace image for statistic unit described in each is applied in the complete bright image of described single primary colours to count the brightness value of the brightness statistics value in the regional frame corresponding in the complete bright image of described single primary colours of statistic unit described in each as described statistic unit; And
(v) using the ratio of target brightness value and the brightness value of statistic unit described in each as the luminance compensation coefficient of described statistic unit to act on the complete bright image of corresponding described single primary colours in described statistic unit and there is the brightness correction coefficients of all LED points of described same color.
2. LED display uniformity compensation method as claimed in claim 1, it is characterized in that, in step (i), the complete bright image of described single primary colours is by controlling light all red LED lamp points in described target viewing area, all green LED lamp point or described blue led lamp point and carry out image acquisition and obtain.
3. LED display uniformity compensation method as claimed in claim 1, it is characterized in that, in step (ii), described dot interlace image is by controlling light the red LED lamp point of a LED pixel of same position in statistic unit described in each, green LED lamp point, blue led lamp point or its combination in any and carry out image acquisition and obtain.
4. LED display uniformity compensation method as claimed in claim 1, is characterized in that, in step (iii), carry out zone location comprise described dot interlace image:
Zone location is carried out to obtain zone location scope to the complete bright image of described single primary colours; And
By described zone location range applications in described dot interlace image to realize zone location to described dot interlace image.
5. LED display uniformity compensation method as claimed in claim 1, it is characterized in that, in step (i), described dot interlace image lights in statistic unit described in each the same color LED point of the LED pixel being in center by control and carries out image acquisition and obtain; Correspondingly, described step (iii) comprises and carries out point location to obtain the Geometric center coordinates of the described regional frame corresponding in described dot interlace image of statistic unit described in each to described dot interlace imagery exploitation grey scale centre of gravity method.
6. LED display uniformity compensation method as claimed in claim 1, it is characterized in that, in step (iv), the described brightness value of statistic unit described in each is the brightness value sum of all image pixels in regional frame that described statistic unit is corresponding in the complete bright image of described single primary colours.
7. LED display uniformity compensation method as claimed in claim 1, it is characterized in that, in step (v), described target brightness value is the mean value of the described brightness value of a designated statistics unit in described multiple statistic unit of described target viewing area or the described brightness value for described multiple statistic unit of described target viewing area.
8. LED display uniformity compensation method as claimed in claim 1, it is characterized in that, described target viewing area is the whole viewing area of described LED display.
9. LED display uniformity compensation method as claimed in claim 8, it is characterized in that, described LED display comprises multiple casing, the width of casing described in each and be highly respectively width and the integral multiple highly of described statistic unit.
10. LED display uniformity compensation method as claimed in claim 8, it is characterized in that, described LED display comprises multiple LED lamp panel, the width of LED lamp panel described in each and be highly respectively width and the integral multiple highly of described statistic unit.
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