CN112419966B - Method for correcting pixel brightness of nonstandard interval between display units - Google Patents

Method for correcting pixel brightness of nonstandard interval between display units Download PDF

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CN112419966B
CN112419966B CN202011285244.0A CN202011285244A CN112419966B CN 112419966 B CN112419966 B CN 112419966B CN 202011285244 A CN202011285244 A CN 202011285244A CN 112419966 B CN112419966 B CN 112419966B
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display area
led pixel
pixel display
led
row
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CN112419966A (en
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苗静
周洋
汪洋
李宏侠
丁铁夫
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Changchun Cedar Electronics Technology Co Ltd
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Changchun Cedar Electronics Technology Co Ltd
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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]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
    • G09F9/3026—Video wall, i.e. stackable semiconductor matrix display modules
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

Abstract

The invention relates to a method for correcting pixel brightness of non-standard space between display units, which comprises the following steps: correcting the brightness of the LED pixels in the whole screen range, obtaining coordinates of cross points of transverse and vertical gaps among all modules of the whole screen in a camera screen, and calculating the width of a single-row or single-column LED pixel display area and the positions and the lengths of the transverse and vertical gaps; dividing the vertical seams into 1-n vertical seam subsections according to the length direction; for each vertical seam subsection, intercepting a vertical standard display area and a vertical nonstandard display area which are adjacent to the vertical standard display area and have equal integral areas, calculating a correction coefficient of each LED pixel in the vertical nonstandard display area to finish the brightness correction of the vertical seam subsection, and repeating the steps to finish the brightness correction of the vertical seams between all adjacent modules; and similarly, finishing the brightness correction of the transverse seams between all the adjacent modules. The invention can finish the automatic correction of the brightness of the splicing seams between the display units and has high correction precision.

Description

Method for correcting pixel brightness of nonstandard spacing between display units
Technical Field
The invention belongs to the technical field of optical acquisition and correction of LED display screens, and relates to a method for correcting pixel brightness of nonstandard intervals among display units.
Background
The LED display screen is formed by splicing a plurality of display units. The large display unit is typically a cabinet; the display box bodies are composed of a plurality of small display units, namely modules; the module is composed of a plurality of smaller display units, namely modules. The splicing gaps among modules, between modules and between boxes are large, so that the pixel pitch at the spliced part is larger than the standard pixel pitch. Thus, a black line appears at the display, and the display is regarded as a black line at an effective observation distance. One of the methods for eliminating the black lines from the optical appearance of the observer is to perform brightness enhancement correction on one or two sides of the black lines, that is, to increase the brightness of one or two sides of the black lines according to the ratio of the pixel pitch between the modules, modules and boxes to the standard pixel pitch, so that the observer can visually perceive the brightness between the modules to be consistent and the black lines cannot be seen in the observation distance. In fact, the gap between the display units is smaller than the standard pixel pitch, and at this time, the correction ratio is smaller than 1, so that the brightness of the pixels on one side or two sides of the gap is reduced, and an observer can visually sense that the brightness between the modules is consistent in the observation distance, and cannot see the existence of the bright gap.
The seam repair is divided into two categories: one is an inter-module seam that can be fixed after the display screen unit is produced. Such a patchwork is a gap between modules and between modules inside the display unit, which has been fixed during the production process, so that the correction can be done during the production process. The other type is the splicing seam between display screen boxes, and the splicing seam between modules and between modules after box maintenance. Such seams are not controllable, and are only fixed after the screen is built, so that the correction can only be done on site. Because the number of modules is large and the number of abutted seams is large, the workload of completely manually correcting is large. And a unified correction standard is not available, and the correction effect is not satisfactory. The brightness automatic correction is inevitable. There are many ways to automatically correct the brightness. The effect of the different methods is also different.
Disclosure of Invention
The invention aims to provide a method for correcting the brightness of pixels with non-standard intervals among display units, which can automatically correct the brightness of the joints among the display units.
In order to solve the above technical problem, the method for correcting the brightness of the pixel with the nonstandard spacing between the display units comprises the following steps:
correcting the brightness of the LED pixels in the whole screen range, simultaneously obtaining the coordinates of the cross points of the transverse and vertical gaps among all modules of the whole screen in the camera screen, calculating the number of the camera pixels corresponding to the width of a single LED pixel area according to the resolution of the camera screen, adding 0.5 to the number, and rounding to obtain the width of a single-row LED pixel or a single-column LED pixel display area; lighting one single-color tube core of all LED pixels in the display screen, and using a camera to aim at the display screen to take a picture to obtain a whole screen picture; calculating the positions and the lengths of transverse seams and vertical seams among all the modules according to the coordinates of the cross points of the transverse seams and the vertical seams of the adjacent modules;
aiming at the vertical joint between any two adjacent modules, dividing the vertical joint into 1-n vertical joint parts according to the length direction; for each vertical seam subsection, intercepting a vertical standard display area and a vertical non-standard display area which are adjacent to the vertical standard display area and have equal integral areas, and calculating the mean value L of the camera pixel brightness data in the vertical standard display area b And the mean value L of the brightness data of the camera pixels in the vertical nonstandard display area f By L b Is divided by L f Obtaining the correction proportion of the LED pixels in the vertical nonstandard display area; multiplying the correction ratio by the correction coefficient of each LED pixel in the vertical nonstandard display area to finish the brightness correction of the vertical seam subsection; finishing the brightness correction of the vertical seams between all the adjacent modules in the same way; the vertical standard display area is defined as a parallelogram LED pixel display area in an area where the standard pixel interval near the vertical seam is located, and the vertical nonstandard display area is defined as a parallelogram LED pixel display area in an area where the nonstandard pixel interval near the vertical seam is located;
aiming at the transverse seam between any adjacent modules, dividing the transverse seam into 1-n transverse seam subsections according to the length direction; for each transverse seam subsection, intercepting a transverse standard display area and a transverse non-standard display area with equal integral areas near the transverse seam, and calculating a mean value L of camera pixel brightness data in the transverse standard display area b And the mean value L of the brightness data of the camera pixels in the transverse non-standard display area f With L b Is divided by L f Obtaining the correction proportion of the LED pixels in the transverse non-standard display area; multiplying the correction ratio by the correction of each LED pixel except for one row of LED pixels at the end of the whole transverse seam in the transverse non-standard display areaThe coefficient completes brightness correction in the transverse non-standard display area; finishing the brightness correction of the transverse seams between all the adjacent modules in the same way; the horizontal standard display area is defined as a parallelogram LED pixel display area in an area where the standard pixel interval is located near the transverse seam, and the horizontal non-standard display area is defined as a parallelogram LED pixel display area in an area where the non-standard pixel interval is located near the transverse seam.
The monochrome die is preferably a green die.
The lengths of the 1-n vertical seam subsections and the 1-n transverse seam subsections can be equal or unequal.
The value of n in the perps section is not greater than the height H of each module mod (ii) a The value of n in the transverse seam subsection is not more than the length W of each module mod 。
And (3) using a camera to aim at the display screen to take a picture under a darkroom condition to obtain a picture of the whole screen, or using the camera to aim at the display screen to take a picture under a non-darkroom condition to obtain a picture of the whole screen.
Aiming at the perps between any adjacent modules, dividing the perps into 1 perp subsection according to the length direction; intercepting two columns of LED pixel display areas on the left side and the right side of the vertical seam aiming at the vertical seam part, wherein an A single-column LED pixel display area 11 and a D single-column LED pixel display area 14 are vertical standard display areas; the B single-row LED pixel display area 12 and the C single-row LED pixel display area 13 are vertical nonstandard display areas; calculating to obtain camera pixel brightness data mean values L11, L12, L13 and L14 in an A single-column LED pixel display area, a B single-column LED pixel display area, a C single-column LED pixel display area and a D single-column LED pixel display area respectively; calculating the average value of L11 and L14, and dividing the average value by L12 to obtain the correction ratio K12 of the LED pixels in the B single-row LED pixel display area 12; dividing the average value of L11 and L14 by L13 to obtain the correction ratio K13 of the LED pixels in the C single-row LED pixel display area 13; multiplying the correction coefficient of each LED pixel in the B single-row LED pixel display area 12 by the correction ratio K12, and multiplying the correction coefficient of each LED pixel in the C single-row LED pixel display area 13 by the correction ratio K13 to finish the brightness correction of the vertical seam; similarly, finishing the brightness correction of the vertical seams between all the adjacent modules;
aiming at the transverse seam between any two adjacent modules, dividing the transverse seam into 1 transverse seam subsection according to the length direction; aiming at the transverse seam subsection, intercepting two rows of LED pixel display areas on the upper side and the lower side of the transverse seam respectively, wherein the single-row LED pixel display area 16A and the single-row LED pixel display area 19D are transverse standard display areas, and the single-row LED pixel display area 17B and the single-row LED pixel display area 18C are non-standard display areas; calculating to obtain mean values L16, L17, L18 and L19 of the brightness data of the camera pixels in the A single-line LED pixel display area, the B single-line LED pixel display area, the C single-line LED pixel display area and the D single-line LED pixel display area respectively; calculating the average value of L16 and L19, and dividing the average value by L17 to obtain the correction ratio K17 of the LED pixels in the single-row B LED pixel display area 17; dividing the average value of L16 and L19 by L18 to obtain the correction ratio K18 of the LED pixels in the single row C LED pixel display region 18; multiplying the correction coefficient of each LED pixel except the LED pixels in the row at two ends in the single-row LED pixel display area 17 by the correction ratio K17, and multiplying the correction coefficient of each LED pixel except the LED pixels in the row at two ends in the single-row LED pixel display area 18 by the correction ratio K18 to finish the brightness correction of the transverse seam; and similarly, finishing the brightness correction of the transverse seams between all the adjacent modules.
Aiming at the perps between any adjacent modules, dividing the perps into 1 perp subsection according to the length direction; intercepting three rows of LED pixel display areas on the left side and the right side of the vertical seam according to the vertical seam part, wherein a first double-row LED pixel display area 21 and a third double-row LED pixel display area 23 are vertical standard display areas; the second dual-column LED pixel display area 22 is a vertical non-standard display area; calculating to obtain mean values L21, L22 and L23 of camera pixel brightness data in a first double-row LED pixel display area, a second double-row LED pixel display area and a third double-row LED pixel display area respectively; calculating the average value of L21 and L23, and dividing the average value by L22 to obtain the correction ratio K22 of the LED pixels in the second double-row LED pixel display area 22; multiplying the correction ratio K22 by the correction coefficient of each LED pixel in the second double-row LED pixel display area 22 to finish the brightness correction of the vertical seam; similarly, finishing the brightness correction of the vertical seams between all the adjacent modules;
aiming at the transverse seam between any two adjacent modules, dividing the transverse seam into 1 transverse seam subsection according to the length direction; for the transverse seam subsection, intercepting three rows of LED pixel display areas on the upper side and the lower side of the transverse seam respectively, wherein a sixth double-row LED pixel display area 26 and an eighth double-row LED pixel display area 28 are transverse standard display areas, and a seventh double-row LED pixel display area 27 is a transverse nonstandard display area; calculating to obtain mean values L26, L27 and L28 of camera pixel brightness data in a sixth double-row LED pixel display area, a seventh double-row LED pixel display area and an eighth double-row LED pixel display area respectively; calculating the average value of L26 and L28, and dividing the average value by L27 to obtain the correction ratio K27 of the LED pixels in the seventh double-row LED pixel display area 27; multiplying the correction coefficient of each LED pixel except for each row of LED pixels at two ends in the seventh double-row LED pixel display area 27 by the correction proportion K27 to finish the brightness correction of the transverse seam; and similarly, finishing the brightness correction of the transverse seams between all the adjacent modules.
Aiming at the vertical joint between any two adjacent modules, dividing the vertical joint into 1 vertical joint subsection according to the length direction; aiming at the vertical seam subsection, five rows of integral LED pixel display areas of the left side and the right side of the vertical seam are intercepted, and ten rows are total; the A-LED pixel display area 31 and the C-LED pixel display area 33 are vertical standard display areas, and the B-LED pixel display area 32 is a vertical nonstandard display area; the LED display device comprises an A-LED pixel display area 31, a row 2 LED pixel starting from the whole LED pixel display area and ending at a row 4 LED pixel of the whole LED pixel display area, and an A-LED pixel display area 31, a row 1 LED pixel starting from the whole LED pixel display area and ending at a row 3 LED pixel of the whole LED pixel display area; the upper side of the B-LED pixel display area 32 starts from the 5 th column of LED pixels of the whole LED pixel display area and ends at the 7 th column of LED pixels of the whole LED pixel display area, and the lower side of the B-LED pixel display area 32 starts from the 4 th column of LED pixels of the whole LED pixel display area and ends at the 6 th column of LED pixels of the whole LED pixel display area; the 8 th column of LED pixels starting from the whole LED pixel display area above the C-LED pixel display area 33 and ending at the 10 th column of LED pixels of the whole LED pixel display area, and the 7 th column of LED pixels starting from the whole LED pixel display area below the C-LED pixel display area 33 and ending at the 9 th column of LED pixels of the whole LED pixel display area; respectively calculating to obtain camera pixel brightness data L31, L32 and L33 in an A-LED pixel display area, a B-LED pixel display area and a C-LED pixel display area; calculating the average value of L31 and L33, and dividing the average value by L32 to obtain the correction ratio K32 of the LED pixels in the B-LED pixel display area 32; multiplying the correction coefficient of each LED pixel in the B-LED pixel display area 32 by the correction proportion K32 to finish the brightness correction of the vertical seam; similarly, finishing the brightness correction of the vertical seams between all the adjacent modules;
aiming at the transverse seam between any two adjacent modules, dividing the transverse seam into 1 transverse seam subsection according to the length direction; aiming at the transverse seam subsection, intercepting the whole LED pixel display area of five lines on the left side and the right side of the transverse seam, wherein the five lines are ten lines in total; wherein the D-LED pixel display area 36 and the F-LED pixel display area 38 are lateral standard display areas; the E-LED pixel display area 37 is a lateral non-standard display area; the left side of the D-LED pixel display area 36 starts from the 2 nd row of LED pixels of the whole LED pixel display area and ends at the 4 th row of LED pixels of the whole LED pixel display area, and the right side of the D-LED pixel display area 36 starts from the 1 st row of LED pixels of the whole LED pixel display area and ends at the 3 rd row of LED pixels of the whole LED pixel display area; the left side of the E-LED pixel display area 37 starts from the 5 th row of LED pixels of the whole LED pixel display area and ends at the 7 th row of LED pixels of the whole LED pixel display area, and the right side of the E-LED pixel display area 37 starts from the 4 th row of LED pixels of the whole LED pixel display area and ends at the 6 th row of LED pixels of the whole LED pixel display area; the left side of the F-LED pixel display area 38 starts from the 8 th row of LED pixels of the entire LED pixel display area and ends at the 10 th row of LED pixels of the entire LED pixel display area, and the right side of the F-LED pixel display area 38 starts from the 7 th row of LED pixels of the entire LED pixel display area and ends at the 9 th row of LED pixels of the entire LED pixel display area; calculating to obtain mean values L36, L37 and L38 of the luminance data of the pixels in the D-LED pixel display area 36, the E-LED pixel display area 37 and the F-LED pixel display area 38 respectively; calculating the average value of L36 and L38, and dividing the average value by L37 to obtain the correction ratio K37 of the LED pixels in the E-LED pixel display area 37; multiplying the correction coefficient of each LED pixel except for the LED pixels in the row at the two ends in the E-LED pixel display area 37 by the correction proportion K37 to finish the brightness correction of the transverse seam; and similarly, finishing the brightness correction of the transverse seams between all the adjacent modules.
Aiming at the vertical joint between any two adjacent modules, dividing the vertical joint into 3 vertical joint parts according to the length direction; intercepting two lines of LED pixel display areas on the left side and the right side of each vertical seam part to obtain 4 rectangular single-line LED pixel display areas with equal integral areas; for the first vertical seam subsection, the first single-row LED pixel display area 411 and the fourth single-row LED pixel display area 414 are vertical standard display areas; the second single-column LED pixel display area 412 and the third single-column LED pixel display area 413 are vertical non-standard display areas; calculating to obtain mean values L411, L412, … … and L414 of camera pixel brightness data in a first single-row LED pixel display area, a second single-row LED pixel display area, a third single-row LED pixel display area and a fourth single-row LED pixel display area respectively; calculating the average value of the L411 and the L414, and dividing the average value by the L412 to obtain a correction ratio K412 of the LED pixels in the second single-row LED pixel display area 412; dividing the average value of L411 and L414 by L413 to obtain a correction ratio K413 of the LED pixels in the third single-row LED pixel display area 413; the luminance correction of the vertical joint part can be completed by multiplying the correction coefficient of each LED pixel in the second single-row LED pixel display area 412 by the correction ratio K412 and multiplying the correction coefficient of each LED pixel in the third single-row LED pixel display area 413 by the correction ratio K413; similarly, finishing the correction of other two vertical joint subsections;
repeating the above process to complete brightness correction of vertical seams between all adjacent modules;
aiming at the transverse seam between any adjacent modules, dividing the transverse seam into 3 transverse seam subsections according to the length direction; intercepting two lines of LED pixel display areas on the upper side and the lower side of each transverse seam aiming at each transverse seam subsection; obtaining a single-row LED pixel display area with four rectangles from top to bottom, wherein the single-row LED pixel display area has the same integral area; for the first left horizontal seam subsection, the first single-row LED pixel display area 421 and the fourth single-row LED pixel display area 424 are vertical standard display areas; the second single-row LED pixel display area 422 and the third single-row LED pixel display area 423 are vertical non-standard display areas; calculating to obtain mean values L421, L422, … … and L424 of the luminance data of the pixels in the first single-row LED pixel display area, the second single-row LED pixel display area, the third single-row LED pixel display area and the fourth single-row LED pixel display area respectively; calculating the average value of the L421 and the L424, and dividing the average value by the L422 to obtain the correction proportion K422 of the LED pixels in the second single-row LED pixel display area 422; dividing the average value of the L421 and the L424 by the L423 to obtain a correction ratio K423 of the LED pixels in the third single-line LED pixel display area 423; multiplying the correction coefficient of each LED pixel except for one row of LED pixels at the end part of the whole transverse seam in the second single-row LED pixel display area 422 by the correction ratio K422, and multiplying the correction coefficient of each LED pixel except for one row of LED pixels at the end part of the whole transverse seam in the third single-row LED pixel display area 423 by the correction ratio K423 to finish the brightness correction of the transverse seam subsection; similarly, finishing the correction of other two transverse seam subsections;
and repeating the above process to finish the brightness correction of the transverse seams between all the adjacent modules.
The method comprises the steps of firstly calculating the accurate number (6 bits after reserving pixel points) of camera pixels corresponding to the width of a display pixel; the number is added with 0.5, and then 4 times 5 times, and then rounded, and the width is used as the basic unit width of the treatment. Therefore, the processing basic unit width is equal to (or slightly larger than) the display pixel width, the integrity of the processed pixel is ensured, and the correction precision of the black line or the bright line is ensured. Since the width of the actual display pixels is almost impossible to be an integer multiple of the number of camera pixels, there is the above-mentioned problem of 4-way 5-way rounding. Due to the non-integral multiple relationship and the condition that the brightness of one camera pixel is gradually reduced from the center to the periphery in the area of the display pixel, the two factors cause that the total brightness integral value actually covered by the selected area with equal integral area is different in principle, and the difference reduces the final black line correction precision. This is a drawback that the division of the integration area into rectangles cannot overcome. The invention adopts an oblique parallelogram method, namely the integral area is divided according to an oblique parallelogram, and the position of the width direction of the integral area can be adjusted gradually in the length direction of the integral area, thereby eliminating the position difference of each integral area to the display pixel best, and further improving the correction precision of black lines or bright lines.
Drawings
The invention is described in further detail below with reference to the figures and specific examples.
FIG. 1 is a schematic diagram of LED pixel imaging in a camera area array.
FIG. 2 is a schematic diagram of a green display pixel being lit dot by dot.
Fig. 3 is a camera shooting a full green image.
FIG. 4 is a 2-column screenshot of each side of the perps.
FIG. 5 is a 2-line screenshot of each side of the transverse seam.
FIG. 6 is a schematic diagram of 3 columns of screen shots on both sides of a vertical seam, dividing the area into regions according to a vertical parallelogram.
Fig. 7 is a schematic diagram of 3 lines of screenshots on both sides of a transverse seam and dividing the area into regions according to a transverse parallelogram.
FIG. 8 is a screenshot of 5 columns on each side of the perps.
Fig. 9a and 9b are schematic diagrams of weighting calculation.
Fig. 10 is a sectional view of 5 lines on both sides of the transverse seam.
FIG. 11 is a schematic illustration of a split of a perl into 3 perl sections.
Fig. 12 is a schematic view of a cross-stitch subdivision into 3 cross-stitch subsections.
Detailed Description
Example one
In this embodiment: the application of a whole-screen rectangle screenshot, a single-width rectangle and 1 subsection n.
Step one), in the whole screen range of the display unit which can be accommodated by the camera view field, firstly, the method of the prior art is adopted to obtain the correction coefficient of each LED pixel and load the correction coefficient to the driving circuit, the brightness correction of the LED pixels of the whole screen is completed, and the brightness plane with consistent brightness is obtained, so that the feeling of black lines caused by overlarge gaps among the LED pixels is highlighted. The coordinates of the cross points of the transverse and vertical gaps among all modules of the whole screen in the camera screen are obtained while correction is carried out; and meanwhile, the number of camera pixels corresponding to the width of a single LED pixel area can be calculated according to the resolution of a camera screen. The number is added with 0.5 and then rounded to be used as the width of a single-row LED pixel or single-column LED pixel display area, so that the width of the single-row LED pixel or single-column LED pixel display area can be ensured to be slightly larger than the actual width of the single LED pixel area, and the integrity of the LED pixels is ensured.
Step two), lightening green tube cores of all LED pixels in the display unit point by point, wherein the brightness of all the LED pixels is the corrected brightness; the reason for lighting only green is for two reasons: the first primary color is enough to reflect the brightness difference between pixels; secondly, green is brighter in the three primary colors, so that the green represents the brightness of the pixel more easily and accurately. But the invention is not limited to green, but other primary colors or a color combining red, green and blue in pairs, or all the three primary colors can be lighted up).
The method is completed under the darkroom condition or the camera is used for aiming at the display screen to shoot under the non-darkroom condition to obtain the picture of the whole screen, and the shooting precision is reduced only when the camera is used for aiming at the display screen under the non-darkroom condition; because the coordinates of the intersection points of the horizontal and vertical gaps among all the modules are obtained after processing in the brightness correction. Therefore, the positions and the lengths of the transverse seams and the vertical seams among all the modules can be calculated according to the coordinates of the cross points of the adjacent transverse seams and the vertical seams. The physical coordinates of each LED pixel point are known during brightness correction, the coordinates of the cross point of the transverse seam and the vertical seam of the module can be known according to the coordinate position and the module size, and the length of the seam can be calculated according to the coordinates of the cross point of each module.
And step three), intercepting two rows of LED pixel display areas at the left side and the right side of the vertical joint according to the position and the length of the vertical joint aiming at the vertical joint between any two adjacent modules (namely, dividing the vertical joint into 1 vertical joint part according to the length direction), and obtaining four rectangular single-row LED pixel display areas from left to right with equal integral area as shown in FIG. 4. The A single-row LED pixel display area 11 and the D single-row LED pixel display area 14 are vertical standard display areas; the B single-row LED pixel display area 12 and the C single-row LED pixel display area 13 are vertical nonstandard display areas; calculating to obtain mean values L11, L12, L13 and L14 of camera pixel brightness data in an A single-row LED pixel display area, a B single-row LED pixel display area, a C single-row LED pixel display area and a D single-row LED pixel display area respectively; the vertical standard display area is defined as a parallelogram LED pixel display area in an area (namely, an area close to the vertical seam but not covering the vertical seam) where the standard pixel interval is located near the vertical seam, and the vertical nonstandard display area is defined as a parallelogram LED pixel display area in an area (namely, an area covering the vertical seam) where the nonstandard pixel interval is located near the vertical seam;
step four), calculating the average value of L11 and L14, and dividing the average value by L12 to obtain the correction ratio K12 of the LED pixels in the B single-row LED pixel display area 12; dividing the average value of L11 and L14 by L13 to obtain the correction ratio K13 of the LED pixels in the C single-row LED pixel display area 13; the correction ratio K12 is multiplied by the correction coefficient of each LED pixel in the B single-row LED pixel display area 12, and the correction ratio K13 is multiplied by the correction coefficient of each LED pixel in the C single-row LED pixel display area 13, so that the brightness correction of the vertical seam can be completed; and in the same way, the brightness correction of the vertical seams between all the adjacent modules can be completed.
Step five), as shown in fig. 5, for a transverse seam between any two adjacent modules, intercepting two lines of LED pixel display areas at the upper side and the lower side of the transverse seam according to the position and the length of the transverse seam (namely dividing the transverse seam into 1 transverse seam part according to the length direction); obtaining a single-row LED pixel display area with four rectangles with equal integral area from top to bottom; the LED pixel display area 16 of the single line A and the LED pixel display area 19 of the single line D are transverse standard display areas, and the LED pixel display area 17 of the single line B and the LED pixel display area 18 of the single line C are non-standard display areas; calculating to obtain mean values L16, L17, L18 and L19 of the brightness data of the camera pixels in the A single-line LED pixel display area, the B single-line LED pixel display area, the C single-line LED pixel display area and the D single-line LED pixel display area respectively;
step six), calculating the average value of L16 and L19, and dividing the average value by L17 to obtain the correction proportion K17 of the LED pixels in the single-row B LED pixel display region 17; dividing the average value of L16 and L19 by L18 to obtain the correction ratio K18 of the LED pixels in the single row C LED pixel display region 18; the brightness correction of the transverse seam can be finished by multiplying the correction coefficient of each LED pixel except for the LED pixels in the row at two ends in the B single-row LED pixel display area 17 by the correction ratio K17 and multiplying the correction coefficient of each LED pixel except for the LED pixels in the row at two ends in the C single-row LED pixel display area 18 by the correction ratio K18; similarly, the brightness correction of the transverse seams between all the adjacent modules can be completed.
Example two
In this embodiment: full screen rectangle screen capture, double width rectangle, n ═ 1 subsection applications.
Step one), in the whole screen range that the camera visual field can hold, adopt the method of the prior art to obtain the correction coefficient of each LED pixel at first and load to the drive circuit, finish the luminance correction of the LED pixel of the whole screen, obtain the luminance level with identical luminance, thus has highlighted the sensation of the black line caused by too big gap among LED pixel. The coordinates of the cross points of the transverse and vertical gaps among all the modules of the whole screen in the camera screen are obtained while correcting; meanwhile, the number of camera pixels corresponding to the width of a single LED pixel area can be calculated according to the resolution of a camera screen. The number is added with 0.5 and then rounded to be used as the width of a single-row LED pixel or single-column LED pixel display area, so that the width of the single-row LED pixel or single-column LED pixel display area can be ensured to be slightly larger than the actual width of a single LED pixel area, and the integrity of the LED pixels is ensured.
Step two), lightening green tube cores of all LED pixels in the display screen point by point, wherein the brightness of all the LED pixels is the corrected brightness; and (5) aiming at the display screen by using a camera to take a picture to obtain a whole screen picture. Because the coordinates of the intersection points of the horizontal and vertical gaps among all the modules are obtained after processing in the brightness correction. Therefore, the positions and the lengths of the transverse seams and the vertical seams among all the modules can be calculated according to the coordinates of the cross points of the adjacent transverse seams and the vertical seams.
And step three), cutting three rows of LED pixel display areas on the left side and the right side of the vertical joint according to the position and the length of the vertical joint aiming at the vertical joint between any two adjacent modules, and obtaining three rectangular double-row LED pixel display areas with equal integral area, namely a left rectangle, a middle rectangle and a right rectangle, as shown in figure 6. The first double-row LED pixel display area 21 and the third double-row LED pixel display area 23 are vertical standard display areas; the second two-column LED pixel display area 22 is a vertical non-standard display area; and calculating to obtain the mean values L21, L22 and L23 of the camera pixel brightness data in the first double-row LED pixel display area, the second double-row LED pixel display area and the third double-row LED pixel display area respectively.
Step four) calculating the average value of L21 and L23, and dividing the average value by L22 to obtain the correction ratio K22 of the LED pixels in the second double-row LED pixel display area 22; the correction ratio K22 of the LED pixels is multiplied by the correction coefficient of each LED pixel in the second double-row LED pixel display area 22, so that the brightness correction of the vertical seam can be completed; in the same way, the brightness correction of the vertical seams between all adjacent modules can be completed;
step five), as shown in fig. 7, cutting out three lines of LED pixel display areas on the upper side and the lower side of a transverse seam according to the position and the length of the transverse seam for the transverse seam between any two adjacent modules; and obtaining an upper rectangular double-row LED pixel display area, a middle rectangular double-row LED pixel display area and a lower rectangular double-row LED pixel display area which have the same integral area. The sixth double-row LED pixel display area 26 and the eighth double-row LED pixel display area 28 are horizontal standard display areas; the seventh double row LED pixel display area 27 is a lateral non-standard display area; and calculating to obtain mean values L26, L27 and L28 of the camera pixel brightness data in the sixth, seventh and eighth double-row LED pixel display areas respectively.
Step six) calculating the average value of L26 and L28, and dividing the average value by L27 to obtain the correction ratio K27 of the LED pixels in the seventh double-row LED pixel display area 27; the correction ratio K27 of the LED pixels is multiplied by the correction coefficients of other LED pixels except for the LED pixels in the row at two ends in the seventh double-row LED pixel display area 27, so that the brightness correction of the transverse seam can be completed; and similarly, the brightness correction of the transverse seams between all adjacent modules can be completed.
EXAMPLE III
In this embodiment: full screen rectangular screen shot, three-width parallelogram, n-1 subsection.
Step one), in the whole screen range that the camera visual field can accommodate, adopt the method of the prior art to obtain the correction coefficient of every LED pixel at first and load to the drive circuit, finish the luminance correction of the whole screen LED pixel, obtain the luminance level with identical luminance, so that the perception of the black line caused by too big gap among the LED pixel of highlighting. The coordinates of the cross points of the transverse and vertical gaps among all modules of the whole screen in the camera screen are obtained while correction is carried out; and meanwhile, the number of camera pixels corresponding to the width of a single LED pixel area can be calculated according to the resolution of a camera screen. The number is added with 0.5 and then rounded to be used as the width of a single-row LED pixel or single-column LED pixel display area, so that the width of the single-row LED pixel or single-column LED pixel display area can be ensured to be slightly larger than the actual width of the single LED pixel area, and the integrity of the LED pixels is ensured.
Step two), lightening green tube cores of all LED pixels in the display screen point by point, wherein the brightness of all the LED pixels is the corrected brightness; and (5) aiming at the display screen by using a camera to take a picture to obtain a whole screen picture. Because the coordinates of the intersection points of the horizontal and vertical gaps among all the modules are obtained after processing in the brightness correction. Therefore, the positions and the lengths of the transverse seams and the vertical seams among all the modules can be calculated according to the coordinates of the cross points of the adjacent transverse seams and the vertical seams.
Step three), cutting five rows of the left side and the right side of a vertical joint according to the position and the length of the vertical joint aiming at the vertical joint between any two adjacent modules, and obtaining ten rows of integral LED pixel display areas; as shown in fig. 8, an a-LED pixel display region 31, a B-LED pixel display region 32, and a C-LED pixel display region 33 of an oblique parallelogram having an equal integration area are divided from left to right in the entire LED pixel display region; the LED display device comprises an A-LED pixel display area 31, a row 2 LED pixel starting from the whole LED pixel display area and ending at a row 4 LED pixel of the whole LED pixel display area, and an A-LED pixel display area 31, a row 1 LED pixel starting from the whole LED pixel display area and ending at a row 3 LED pixel of the whole LED pixel display area; the upper side of the B-LED pixel display area 32 starts from the 5 th column of LED pixels of the whole LED pixel display area and ends at the 7 th column of LED pixels of the whole LED pixel display area, and the lower side of the B-LED pixel display area 32 starts from the 4 th column of LED pixels of the whole LED pixel display area and ends at the 6 th column of LED pixels of the whole LED pixel display area; the 8 th column of LED pixels starting from the entire LED pixel display area above the C-LED pixel display area 33 and ending at the 10 th column of LED pixels of the entire LED pixel display area, and the 7 th column of LED pixels starting from the entire LED pixel display area below the C-LED pixel display area 33 and ending at the 9 th column of LED pixels of the entire LED pixel display area; wherein the a-LED pixel display area 31 and the C-LED pixel display area 33 are vertical standard display areas; the B-LED pixel display area 32 is a vertical non-standard display area; the average values L31, L32, L33 of the luminance data of the pixels in the a-LED pixel display area 31, the B-LED pixel display area 32, and the C-LED pixel display area 33 are calculated, respectively.
Shown in fig. 8 are a-LED pixel display area 31, B-LED pixel display area 32, and C-LED pixel display area 33 of an oblique parallelogram of equal integrated area branching from left to right. Fig. 9a shows a detail of a camera pixel where one of the oblique parallelograms has an LED display pixel area width of 4. Fig. 9b shows three display pixels of one row in the width direction of an oblique parallelogram as represented by camera pixels. An oblique parallelogram region is composed of n such rows. Such a row of three display pixel luminance values is in turn comprised of the sum of the four rows of camera pixel luminance values covered by three display pixels in fig. 9 b. For example the second row camera pixel luminance sum in fig. 9b is Li ═ s1+ s2+ s3+ s4+ s5+ s6+ s7+ s8+ s 9. Wherein s 2-s 8 are the entire camera pixel; s1, s9 are the partial camera pixels that need to be weighted. If the length of the display pixel region is n display pixels and the current row number is the mth row display pixel (m is less than or equal to n), the weight of s1 is (1/n) × m; the weight of s9 is 1- (1/n) × m. The sum of the luminance of the camera pixels covered by the display pixels in the 4 × n rows is divided by the total number of the camera pixels in the oblique parallelogram region, that is, the luminance average value is taken according to the camera pixels, and the average value is the luminance data average value of the camera pixels in the oblique parallelogram region. The average value of the luminance data of the organic pixels in the a-LED pixel display area 31, the B-LED pixel display area 32, and the C-LED pixel display area 33 is thus calculated. This is a "non-standard pitch pixel luminance fine correction method" because the camera pixel integration value per line is actually a continuous gradual transition of 8 or 9 camera pixels per line to the left side thereof, and may include any overlay relationship of the display pixels and the camera pixels, thus eliminating a position error of the overlay relationship of the display pixels and the camera pixels when the rectangular area is divided. The core of the invention is the oblique parallelogram area processing, and the error of rectangular area processing is eliminated. That is, even if the camera is not tilted when taking a picture, it is intentionally processed in a tilted parallelogram, and the accuracy can be improved. So that the camera is naturally immune to tilting. Only when the inclination angle of the camera is very large, the inclination is the same as that of the oblique parallelogram, and the inclination is not allowed when the oblique parallelogram processing is changed into rectangular processing, at this time, all the oblique parallelograms which are inclined towards the left can be changed into right.
Step four), calculating the average value of L31 and L33, and dividing the average value by L32 to obtain the correction proportion K32 of the LED pixels in the B-LED pixel display area 32; the correction ratio K32 of the LED pixel is multiplied by the correction coefficient of each LED pixel in the B-LED pixel display area 32, so that the brightness correction of the vertical seam can be completed; and in the same way, the brightness correction of the vertical seams between all the adjacent modules can be completed.
Step five), aiming at a transverse seam between any two adjacent modules, cutting out five lines of the left side and the right side of the transverse seam according to the position and the length of the transverse seam, wherein the five lines are ten lines of the whole LED pixel display area; as shown in fig. 10, the D-LED pixel display region 36, E-LED pixel display region 37, and F-LED pixel display region 38 are divided into oblique parallelograms having equal integral areas from top to bottom in the entire LED pixel display region; the left side of the D-LED pixel display area 36 starts from the 2 nd row of LED pixels of the whole LED pixel display area and ends at the 4 th row of LED pixels of the whole LED pixel display area, and the right side of the D-LED pixel display area 36 starts from the 1 st row of LED pixels of the whole LED pixel display area and ends at the 3 rd row of LED pixels of the whole LED pixel display area; the left side of the E-LED pixel display area 37 starts from the 5 th row of LED pixels of the whole LED pixel display area and ends at the 7 th row of LED pixels of the whole LED pixel display area, and the right side of the E-LED pixel display area 37 starts from the 4 th row of LED pixels of the whole LED pixel display area and ends at the 6 th row of LED pixels of the whole LED pixel display area; the left side of the F-LED pixel display area 38 starts from the 8 th row of LED pixels of the entire LED pixel display area and ends at the 10 th row of LED pixels of the entire LED pixel display area, and the right side of the F-LED pixel display area 38 starts from the 7 th row of LED pixels of the entire LED pixel display area and ends at the 9 th row of LED pixels of the entire LED pixel display area; wherein the D-LED pixel display area 36 and the F-LED pixel display area 38 are lateral standard display areas; the E-LED pixel display area 37 is a lateral non-standard display area; the mean values L36, L37, L38 of the luminance data of the pixels in the D-LED pixel display area 36, the E-LED pixel display area 37, and the F-LED pixel display area 38 are calculated, respectively.
Step six), calculating the average value of L36 and L38, and dividing the average value by L37 to obtain the correction proportion K37 of the LED pixels in the E-LED pixel display area 37; the correction ratio K37 is multiplied by the correction coefficients of other LED pixels except for a row of LED pixels at two ends in the E-LED pixel display area 37, so that the brightness correction of the transverse seam can be completed; similarly, the brightness correction of the transverse seams between all the adjacent modules can be completed.
Example four
In this embodiment: full screen rectangle screen capture, single width rectangle, n-3 division applications.
Step one), in the whole screen range that the camera visual field can hold, adopt the method of the prior art to obtain the correction coefficient of each LED pixel at first and load to the drive circuit, finish the luminance correction of the LED pixel of the whole screen, obtain the luminance level with identical luminance, thus has highlighted the sensation of the black line caused by too big gap among LED pixel. The coordinates of the cross points of the transverse and vertical gaps among all the modules of the whole screen in the camera screen are obtained while correcting; and meanwhile, the number of camera pixels corresponding to the width of a single LED pixel area can be calculated according to the resolution of a camera screen. The number is added with 0.5 and then rounded to be used as the width of a single-row LED pixel or single-column LED pixel display area, so that the width of the single-row LED pixel or single-column LED pixel display area can be ensured to be slightly larger than the actual width of the single LED pixel area, and the integrity of the LED pixels is ensured.
Step two), lightening green tube cores of all LED pixels in the display screen point by point, wherein the brightness of all the LED pixels is the corrected brightness; the green only lighting is for two reasons: the first primary color is enough to reflect the brightness difference between pixels; green in the three primary colors is brighter, so that the green color is easier and more accurate to represent the brightness of the pixel. But the invention is not limited to green, but other primary colors or a color combining red, green and blue in pairs, or all the three primary colors can be lighted up).
The method is completed under the darkroom condition or the camera is used for aiming at the display screen to shoot under the non-darkroom condition to obtain the whole screen picture, and the shooting precision is reduced only when the camera is used for aiming at the display screen under the non-darkroom condition; because the coordinates of the intersection points of the horizontal and vertical gaps among all the modules are obtained by processing in the brightness correction. Therefore, the positions and the lengths of the transverse seams and the vertical seams among all the modules can be calculated according to the coordinates of the cross points of the adjacent transverse seams and vertical seams.
Step three), aiming at the perps between any adjacent modules, dividing the perps into 3 perps in the length direction; for each vertical seam subsection, two rows of LED pixel display areas on the left and right sides of the vertical seam are cut out, and as shown in fig. 11, 4 rectangular single-row LED pixel display areas with equal integral areas are obtained. The first single-column LED pixel display area 411, the fourth single-column LED pixel display area 44, the fifth single-column LED pixel display area 415, the eighth single-column LED pixel display area 418, the ninth single-column LED pixel display area 419 and the twelfth single-column LED pixel display area 4112 are vertical standard display areas; the second single-column LED pixel display area 412, the third single-column LED pixel display area 413, the sixth single-column LED pixel display area 416, the seventh single-column LED pixel display area 417, the tenth single-column LED pixel display area 4110 and the eleventh single-column LED pixel display area 4111 are vertical non-standard display areas; and calculating to obtain the mean values L411, L412, … … and L4112 of the brightness data of the camera pixels in the display areas of the first, second, … … and twelfth single-column LED pixels respectively.
Step four), calculating the average value of the L411 and the L414, and dividing the average value by the L412 to obtain the correction proportion K412 of the LED pixels in the second single-row LED pixel display area 412; dividing the average value of L411 and L414 by L413 to obtain a correction ratio K413 of the LED pixels in the third single-row LED pixel display area 413; the luminance correction of the vertical joint part can be completed by multiplying the correction coefficient of each LED pixel in the second single-row LED pixel display area 412 by the correction ratio K412 and multiplying the correction coefficient of each LED pixel in the third single-row LED pixel display area 413 by the correction ratio K413; similarly, finishing the correction of other two vertical seam subsections;
and step five), repeating the step three and the step four to finish the brightness correction of the vertical seams between all the adjacent modules.
Step six) as shown in fig. 12, aiming at the transverse seam between any two adjacent modules, dividing the transverse seam into 3 transverse seam parts according to the length direction; intercepting two lines of LED pixel display areas on the upper side and the lower side of each transverse seam aiming at each transverse seam subsection; and obtaining a single-row LED pixel display area with four rectangles from top to bottom, wherein the single-row LED pixel display area has the same integral area. Wherein the first single row LED pixel display area 421, the fourth single row LED pixel display area 424, the fifth single row LED pixel display area 425, the eighth single row LED pixel display area 428, the ninth single row LED pixel display area 429, the twelfth single row LED pixel display area 4212 are vertical standard display areas; the second single line LED pixel display area 422, the third single line LED pixel display area 423, the sixth single line LED pixel display area 426, the seventh single line LED pixel display area 427, the tenth single line LED pixel display area 4210, the eleventh single line LED pixel display area 4211 are vertical non-standard display areas; and calculating to obtain the mean values L421, L422, … … and L4212 of the brightness data of the camera pixels in the display areas of the first, second, … … and twelfth single-line LED pixels respectively.
Step seven), calculating the average value of the L421 and the L424, and dividing the average value by the L422 to obtain the correction proportion K422 of the LED pixels in the second single-row LED pixel display area 422; dividing the average value of the L421 and the L424 by the L423 to obtain a correction ratio K423 of the LED pixels in the third single-line LED pixel display area 423; the luminance correction of the transverse seam part can be completed by multiplying the correction coefficient of each LED pixel except the 1 st row of LED pixels in the second single-row LED pixel display area 422 by the correction proportion K422 and multiplying the correction coefficient of each LED pixel except the 1 st row of LED pixels in the third single-row LED pixel display area 423 by the correction proportion K423; similarly, finishing the correction of other two transverse seam subsections; except that when calculating the correction coefficients for the sixth single row LED pixel display region 426 and the seventh single row LED pixel display region 427, the correction coefficients for all the LED pixels in the entire cross-slit region need to be calculated, and when calculating the correction coefficients for the tenth single row LED pixel display region 4210 and the eleventh single row LED pixel display region 4211, the correction coefficients for all the LED pixels except for the last 1 column LED pixels need to be calculated.
Step eight) repeating the step six and the step seven can finish the brightness correction of the transverse seams between all the adjacent modules.
In the first to fourth embodiments, the camera may be tilted properly when the camera is directed to the display screen for taking a picture.
The invention is not limited to the embodiments described above, it being understood that many alternatives may be made on the basis of the embodiments described above by those skilled in the art. Therefore, any simple changes based on the technical scheme of the claim 1 of the application are within the protection scope of the invention.
On a uniform display plane with consistent brightness, the display pixel spacing of the gaps among the modules is larger than that of other standard display pixels, so that the visual brightness of the gaps is dark, and a display black line appears. According to the invention, the physical size of the irregular interval between the pixels of the gap is not directly acquired, but the screen brightness difference value of the same area around the black line is acquired to judge the lower degree of the black line brightness under the condition that the brightness of all the LED pixels of the whole display screen is the same after correction, and the brightness is improved according to the brightness difference for correction. So first the screen is corrected for uniform brightness, making all display pixels theoretically the same brightness. The proportional relation of the brightness values of the two areas (defined as 'integral area') at the two sides of the gap and the same area at the middle standard pixel interval of the module is the proportional relation between the display pixel interval at the seam and the standard display pixel interval. And the brightness of the display pixels at the two sides of the gap is improved according to the proportional relation, so that the display black line is corrected. The choice of the size and shape of the integration area should not be arbitrary. Random selection will have substantially different precision effects. The length of the integral area can be determined by the number of display pixels in the length direction of the gap, and the width of the integral area is quantitatively selected according to the width of the display pixels. The distance between adjacent display pixels is defined as the "display pixel width". The brightness of the further display pixel is represented by the sum of the integrated values of the brightness of all camera pixels under the area of the display pixel. The area of a single LED pixel is the area with the highest peak value of the camera pixel at the center of the LED pixel and the brightness of the periphery of the LED pixel gradually reduced. If the width of the area selected for integration is smaller than the LED pixel width, the total luminance integration value under each equal selected integration area will not be equal even for the standard display pixel pitch due to the incomplete covered LED pixels, resulting in increased error in the final black line correction. Therefore, the invention is available: firstly, calculating the accurate number (6 bits after reserving pixel points) of camera pixels corresponding to the width of the LED pixels; the number is added with 0.5, and then divided into 4 and 5, and then the whole is taken as the basic unit width of the treatment. Therefore, the processing basic unit width is ensured to be equal to (or slightly larger than) the display pixel width, the integrity of the processed pixel is ensured, and the black line correction precision is ensured. This analyzes the level of accuracy assurance of selecting an integral area that is rectangular in shape. Further, quantitative analysis is not possible because the width of the actual display pixels is almost not integral multiple of the number of the camera pixels, so that the above-mentioned problem of 4-way 5-way rounding exists. Due to the non-integral multiple relationship and the fact that the brightness of one camera pixel is gradually reduced from the center to the periphery in the area of the display pixel, the two factors cause that the total brightness integral value actually covered by the selected regions with equal integral areas is different in principle, and the difference reduces the correction precision of the final black line. This is a drawback that the rectangular division of the integration area cannot overcome. The invention adopts a parallelogram method, namely the integration area is divided according to the parallelogram, and the position of the width of the integration area can be adjusted gradually in the length direction of the integration area, thereby eliminating the position difference of each integration area to the LED pixel best and further improving the correction precision of the black line. Taking a P1.9 screen as an example (a single box body has a width of 320LED pixels and a height of 180LED pixels, and each module in the box body has a width of 80LED pixels and a height of 60LED pixels), the shortest gap is 60LED pixels, so that the accuracy level of correcting the black line is improved by tens of times by the parallelogram method.

Claims (8)

1. A method for correcting the brightness of pixels with non-standard spacing between display units is characterized in that the method comprises the following steps:
correcting the brightness of the LED pixels in the whole screen range, simultaneously obtaining the coordinates of the cross points of the transverse and vertical gaps among all modules of the whole screen in the camera screen, calculating the number of the camera pixels corresponding to the width of a single LED pixel area according to the resolution of the camera screen, adding 0.5 to the number, and rounding the sum to obtain the width of a single-row LED pixel or a single-column LED pixel display area; lighting one single-color tube core of all LED pixels in the display screen, and using a camera to aim at the display screen to take a picture to obtain a whole screen picture; calculating the positions and the lengths of transverse seams and vertical seams among all modules according to the coordinates of the cross points of the transverse seams and the vertical seams of the adjacent modules;
aiming at the vertical joint between any two adjacent modules, dividing the vertical joint into 1-n vertical joint parts according to the length direction; for each vertical seam subsection, intercepting a vertical standard display area and a vertical non-standard display area which are adjacent to the vertical standard display area and have equal integral areas, and calculating the mean value L of the camera pixel brightness data in the vertical standard display area b And the mean value L of the brightness data of the camera pixels in the vertical nonstandard display area f By L b Divided by L f Obtaining the correction proportion of the LED pixels in the vertical nonstandard display area; multiplying the correction ratio by the correction coefficient of each LED pixel in the vertical nonstandard display area to finish the brightness correction of the vertical seam subsection; finishing the brightness correction of the vertical seams between all the adjacent modules in the same way; the vertical standard display area is defined as an area where the standard pixel pitch is located near the vertical seam, namely a parallelogram LED pixel display area in the area close to the vertical seam but not covering the vertical seam, and the vertical nonstandard display area is defined as an area where the nonstandard pixel pitch is located near the vertical seam, namely a parallelogram LED pixel display area in the area covering the vertical seam;
aiming at the transverse seam between any adjacent modules, dividing the transverse seam into 1-n transverse seam subsections according to the length direction; for each transverse seam subsection, intercepting a transverse standard display area and a transverse non-standard display area with equal integral areas near the transverse seam, and calculatingMean value L of camera pixel brightness data in transverse standard display area b And the mean value L of the brightness data of the camera pixels in the transverse non-standard display area f With L b Is divided by L f Obtaining the correction proportion of the LED pixels in the transverse non-standard display area; multiplying the correction ratio by the correction coefficients of other LED pixels except for a row of LED pixels at the end part of the whole transverse seam in the transverse non-standard display area to finish the brightness correction in the transverse non-standard display area; finishing the brightness correction of the transverse seams between all the adjacent modules in the same way; the horizontal standard display area is defined as a parallelogram LED pixel display area in an area where the standard pixel interval is located near the transverse seam, and the horizontal non-standard display area is defined as a parallelogram LED pixel display area in an area where the non-standard pixel interval is located near the transverse seam.
2. The method of claim 1, wherein the monochrome die is a green die.
3. The method of claim 1, wherein the 1-n vertical slit segments and the 1-n horizontal slit segments have equal or different lengths.
4. The method of claim 1, wherein n is not greater than H, where H is a height of each module mod (ii) a The value of n in the transverse seam subsection is not more than the length W of each module mod 。
5. The method of claim 1, wherein the method comprises dividing a vertical joint into 1 vertical joint part in length direction for any vertical joint between adjacent modules; aiming at the vertical seam part, two columns of LED pixel display areas on the left side and the right side of the vertical seam are intercepted, wherein an A single-column LED pixel display area (11) and a D single-column LED pixel display area (14) are vertical standard display areas; the B single-row LED pixel display area (12) and the C single-row LED pixel display area (13) are vertical nonstandard display areas; calculating to obtain mean values L11, L12, L13 and L14 of camera pixel brightness data in an A single-row LED pixel display area, a B single-row LED pixel display area, a C single-row LED pixel display area and a D single-row LED pixel display area respectively; calculating the average value of L11 and L14, and dividing the average value by L12 to obtain the correction ratio K12 of the LED pixels in the B single-row LED pixel display area (12); dividing the average value of L11 and L14 by L13 to obtain a correction ratio K13 of the LED pixels in the C single-row LED pixel display area (13); multiplying the correction coefficient of each LED pixel in the B single-row LED pixel display area (12) by the correction ratio K12, and multiplying the correction coefficient of each LED pixel in the C single-row LED pixel display area (13) by the correction ratio K13 to finish the brightness correction of the vertical seam; similarly, finishing the brightness correction of the vertical seams between all the adjacent modules;
aiming at the transverse seam between any two adjacent modules, dividing the transverse seam into 1 transverse seam subsection according to the length direction; aiming at the transverse seam subsection, intercepting two rows of LED pixel display areas on the upper side and the lower side of the transverse seam respectively, wherein an A single-row LED pixel display area (16) and a D single-row LED pixel display area (19) are transverse standard display areas, and a B single-row LED pixel display area (17) and a C single-row LED pixel display area (18) are non-standard display areas; calculating to obtain mean values L16, L17, L18 and L19 of the brightness data of the camera pixels in the A single-line LED pixel display area, the B single-line LED pixel display area, the C single-line LED pixel display area and the D single-line LED pixel display area respectively; calculating the average value of L16 and L19, and dividing the average value by L17 to obtain the correction ratio K17 of the LED pixels in the single-row B LED pixel display area (17); dividing the average value of L16 and L19 by L18 to obtain a correction ratio K18 of the LED pixels in the single-row C LED pixel display area (18); multiplying the correction coefficient of other LED pixels except for the LED pixels in the row at two ends in the single-row LED pixel display area (17) by the correction proportion K17, and multiplying the correction coefficient of other LED pixels except for the LED pixels in the row at two ends in the single-row LED pixel display area (18) by the correction proportion K18 to finish the brightness correction of the transverse seam; and similarly, finishing the brightness correction of the transverse seams between all the adjacent modules.
6. The method of claim 1, wherein the method comprises dividing a vertical joint into 1 vertical joint part in length direction for any vertical joint between adjacent modules; intercepting three rows of LED pixel display areas on the left side and the right side of the vertical seam according to the vertical seam subsection, wherein a first double-row LED pixel display area (21) and a third double-row LED pixel display area (23) are vertical standard display areas; the second double-column LED pixel display area (22) is a vertical nonstandard display area; calculating to obtain mean values L21, L22 and L23 of camera pixel brightness data in a first double-row LED pixel display area, a second double-row LED pixel display area and a third double-row LED pixel display area respectively; calculating the average value of L21 and L23, and dividing the average value by L22 to obtain the correction ratio K22 of the LED pixels in the second double-row LED pixel display area (22); multiplying the correction coefficient of each LED pixel in the second double-row LED pixel display area (22) by the correction proportion K22 to finish the brightness correction of the vertical seam; similarly, finishing the brightness correction of the vertical seams between all the adjacent modules;
aiming at the transverse seam between any adjacent modules, dividing the transverse seam into 1 transverse seam subsection according to the length direction; aiming at the transverse seam subsection, intercepting three rows of LED pixel display areas on the upper side and the lower side of the transverse seam respectively, wherein a sixth double-row LED pixel display area (26) and an eighth double-row LED pixel display area (28) are transverse standard display areas, and a seventh double-row LED pixel display area (27) is a transverse nonstandard display area; calculating to obtain mean values L26, L27 and L28 of camera pixel brightness data in a sixth double-row LED pixel display area, a seventh double-row LED pixel display area and an eighth double-row LED pixel display area respectively; calculating the average value of L26 and L28, and dividing the average value by L27 to obtain the correction ratio K27 of the LED pixels in the seventh double-row LED pixel display area (27); multiplying the correction coefficient of each LED pixel except for the LED pixels in the row at two ends in the seventh double-row LED pixel display area (27) by the correction proportion K27 to finish the brightness correction of the transverse seam; and similarly, finishing the brightness correction of the transverse seams between all the adjacent modules.
7. The method of claim 1, wherein the method comprises dividing a vertical joint into 1 vertical joint part in length direction for any vertical joint between adjacent modules; aiming at the vertical seam part, five rows of whole LED pixel display areas of the left side and the right side of the vertical seam are intercepted, and the whole LED pixel display areas are ten rows; the A-LED pixel display area (31) and the C-LED pixel display area (33) are vertical standard display areas, and the B-LED pixel display area (32) is a vertical non-standard display area; the upper side of the A-LED pixel display area (31) starts from the 2 nd column LED pixels of the whole LED pixel display area and ends at the 4 th column LED pixels of the whole LED pixel display area, and the lower side of the A-LED pixel display area (31) starts from the 1 st column LED pixels of the whole LED pixel display area and ends at the 3 rd column LED pixels of the whole LED pixel display area; the upper side of the B-LED pixel display area (32) starts from the 5 th column of LED pixels of the whole LED pixel display area and ends from the 7 th column of LED pixels of the whole LED pixel display area, and the lower side of the B-LED pixel display area (32) starts from the 4 th column of LED pixels of the whole LED pixel display area and ends from the 6 th column of LED pixels of the whole LED pixel display area; the upper part of the C-LED pixel display area (33) starts from the 8 th column of LED pixels of the whole LED pixel display area and ends at the 10 th column of LED pixels of the whole LED pixel display area, and the lower part of the C-LED pixel display area (33) starts from the 7 th column of LED pixels of the whole LED pixel display area and ends at the 9 th column of LED pixels of the whole LED pixel display area; respectively calculating to obtain the brightness data L31, L32 and L33 of the camera pixels in the A-LED pixel display area (31), the B-LED pixel display area (32) and the C-LED pixel display area (33); calculating the average value of L31 and L33, and dividing the average value by L32 to obtain the correction ratio K32 of the LED pixels in the B-LED pixel display area (32); multiplying the correction coefficient of each LED pixel in the B-LED pixel display area (32) by the correction proportion K32 to finish the brightness correction of the vertical seam; similarly, the brightness correction of the vertical seams between all the adjacent modules is completed;
aiming at the transverse seam between any adjacent modules, dividing the transverse seam into 1 transverse seam subsection according to the length direction; aiming at the transverse seam subsection, intercepting the whole LED pixel display area of five lines on the left side and the right side of the transverse seam, wherein the five lines are ten lines in total; wherein the D-LED pixel display area (36) and the F-LED pixel display area (38) are lateral standard display areas; the E-LED pixel display area (37) is a lateral non-standard display area; the left side of the D-LED pixel display area (36) starts from the 2 nd row of LED pixels of the whole LED pixel display area and ends at the 4 th row of LED pixels of the whole LED pixel display area, and the right side of the D-LED pixel display area (36) starts from the 1 st row of LED pixels of the whole LED pixel display area and ends at the 3 rd row of LED pixels of the whole LED pixel display area; the left side of the E-LED pixel display area (37) starts from the 5 th row of LED pixels of the whole LED pixel display area and ends at the 7 th row of LED pixels of the whole LED pixel display area, and the right side of the E-LED pixel display area (37) starts from the 4 th row of LED pixels of the whole LED pixel display area and ends at the 6 th row of LED pixels of the whole LED pixel display area; the left side of the F-LED pixel display area (38) starts from the 8 th row of LED pixels of the whole LED pixel display area and ends at the 10 th row of LED pixels of the whole LED pixel display area, and the right side of the F-LED pixel display area (38) starts from the 7 th row of LED pixels of the whole LED pixel display area and ends at the 9 th row of LED pixels of the whole LED pixel display area; calculating to obtain mean values L36, L37 and L38 of the luminance data of the camera pixels in the D-LED pixel display area (36), the E-LED pixel display area (37) and the F-LED pixel display area (38) respectively; calculating the average value of L36 and L38, and dividing the average value by L37 to obtain the correction ratio K37 of the LED pixels in the E-LED pixel display area (37); multiplying the correction coefficient of each LED pixel except for a row of LED pixels at two ends in the E-LED pixel display area (37) by the correction proportion K37 to finish the brightness correction of the transverse seam; and similarly, finishing the brightness correction of the transverse seams between all the adjacent modules.
8. The method of claim 1, wherein the perps are divided into 3 perps along the length direction for any perps between adjacent modules; intercepting two lines of LED pixel display areas on the left side and the right side of each vertical seam part to obtain 4 rectangular single-line LED pixel display areas with equal integral areas; aiming at the first vertical seam subsection, a first single-row LED pixel display area (411) and a fourth single-row LED pixel display area (414) are vertical standard display areas; the second single-row LED pixel display area (412) and the third single-row LED pixel display area (413) are vertical non-standard display areas; respectively calculating to obtain mean values L411, L412, … … and L414 of the brightness data of the camera pixels in a first single-row LED pixel display area, a second single-row LED pixel display area, a third single-row LED pixel display area and a fourth single-row LED pixel display area; calculating the average value of the L411 and the L414, and dividing the average value by the L412 to obtain a correction proportion K412 of the LED pixels in the second single-row LED pixel display area (412); dividing the average value of L411 and L414 by L413 to obtain a correction ratio K413 of the LED pixels in the third single-row LED pixel display area (413); the correction coefficient of each LED pixel in the second single-row LED pixel display area (412) is multiplied by the correction ratio K412, and the correction coefficient of each LED pixel in the third single-row LED pixel display area (413) is multiplied by the correction ratio K413, so that the brightness correction of the vertical seam part can be completed; similarly, finishing the correction of other two vertical joint subsections;
repeating the above process to complete brightness correction of vertical seams between all adjacent modules;
aiming at the transverse seam between any adjacent modules, dividing the transverse seam into 3 transverse seam subsections according to the length direction; intercepting two lines of LED pixel display areas on the upper side and the lower side of each transverse seam aiming at each transverse seam subsection; obtaining a single-row LED pixel display area with four rectangles from top to bottom, wherein the single-row LED pixel display area has the same integral area; aiming at the first left transverse seam subsection, a first single-row LED pixel display area (421) and a fourth single-row LED pixel display area (424) are vertical standard display areas; the second single-row LED pixel display area (422) and the third single-row LED pixel display area (423) are vertical non-standard display areas; calculating to obtain mean values L421, L422, … … and L424 of the luminance data of the pixels in the first single-row LED pixel display area, the second single-row LED pixel display area, the third single-row LED pixel display area and the fourth single-row LED pixel display area respectively; calculating the average value of the L421 and the L424, and dividing the average value by the L422 to obtain the correction proportion K422 of the LED pixels in the second single-line LED pixel display area (422); dividing the average value of the L421 and the L424 by the L423 to obtain a correction proportion K423 of the LED pixels in the third single-line LED pixel display area (423); multiplying the correction coefficient of each LED pixel except for one row of LED pixels at the end part of the whole transverse seam in a second single-row LED pixel display area (422) by a correction ratio K422, and multiplying the correction coefficient of each LED pixel except for one row of LED pixels at the end part of the whole transverse seam in a third single-row LED pixel display area (423) by a correction ratio K423 to finish the brightness correction of the transverse seam part; similarly, finishing the correction of other two transverse seam subsections;
and repeating the process to finish the brightness correction of the transverse seams between all the adjacent modules.
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