CN112802426B - LED display unit seam crossing type brightness correction method - Google Patents
LED display unit seam crossing type brightness correction method Download PDFInfo
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The invention relates to a display unit seam crossing pixel interval brightness correction method, which comprises the following steps: for all inter-module seams in the display unit, brightening 3 rows of LED pixels which are separated by N rows at two sides of the vertical edge seam and 3 rows of LED pixels which are separated by N rows at two sides of the horizontal edge seam; multiplying the brightness enhancement proportion of the brightness enhancement LED pixels by the original correction coefficient to obtain a correction coefficient; and correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam repair. The invention can finish automatic optical seam repair, has high correction precision, simple and convenient operation, strong pixel identification capability and accurate positioning.
Description
Technical Field
The invention belongs to the technical field of optical acquisition and correction of LED display screens, and relates to a crossing type brightness correction method for an LED display unit joint.
Background
The LED display screen is formed by splicing a plurality of display units (usually a box body). The display boxes are composed of a plurality of modules; the module is composed of a plurality of modules. In all the splices, splice gaps among modules, among modules and among boxes are large, so that the pixel spacing at the splice is larger than the standard pixel spacing. This causes a black seam to appear here when displayed, and is seen as a black line over the effective viewing distance. One of the methods for eliminating the black lines from the optical appearance of the observer is to lighten the pixels at two sides of the black lines, namely, to increase the brightness of the pixels at two sides of the black slit according to the ratio of the pixel spacing between the modules, the modules and the box body to the standard pixel spacing, so that the observer can visually feel the consistency of the brightness between the modules and the existence of the black slit at the observation distance, and the method is also called optical slit repairing.
The repair seams are divided into two categories: one type is a piece of inter-module seams which can be fixed after the display screen is produced. The seam is a seam between the internal modules of the display unit, and is fixed in the production process, so that the seam can be repaired in the production process. The other type is a seam between display screen boxes and a seam between front maintenance box modules. Such joints are uncontrollable, and these joints are only fixed after the screen is built, so they can only be completed in the field. Because the number of the modules is very large and the number of the splice seams is very large, the workload of repairing the splice seams completely by manpower can be very large. And the joint repairing effect is often unsatisfactory because of no unified joint repairing standard. So the automatic seam repair is necessary. There are many ways to automatically repair the seam. The effect of the different methods is also different.
Disclosure of Invention
The invention aims to solve the technical problem of providing a display unit joint crossing type pixel space brightness correction method which can realize automatic joint repair in the production process of high-density small-space LED display products and also can realize automatic optical joint repair on site aiming at large-scale high-density small-space LED display units.
In order to solve the technical problems, the display unit seam crossing pixel pitch brightness correction method of the invention comprises the following steps: for all inter-module seams in the display unit, brightening 3 rows of LED pixels which are separated by N rows at two sides of the vertical edge seam and 3 rows of LED pixels which are separated by N rows at two sides of the horizontal edge seam; multiplying the brightness enhancement proportion of the brightness enhancement LED pixels by the original correction coefficient to obtain a correction coefficient; and correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam repair.
For all inter-module seams in the display unit, the last row of LED pixels of the left-side module of the vertical edge seam are brightened, and the right-side module brightens the 2 nd row of LED pixels and the 4 th row of LED pixels; the upper edge module of the transverse edge joint lightens the LED pixels at the bottommost row, and the lower edge module lightens the LED pixels at the 2 nd and 4 th rows.
For all inter-module seams in the display unit, brightening the LED pixels in the last two rows of the left-side modules of the vertical edge seam and brightening the LED pixels in the 1 st and 3 rows of the right-side modules; the upper side module of the transverse edge joint lightens the LED pixels in the penultimate row, and the lower side module lightens the LED pixels in the 1 st row and the 3 rd row.
For all inter-module seams in the display unit, the last row of LED pixels of the left-side module of the vertical edge seam are brightened, and the 3 rd row and the 6 th row of LED pixels are brightened by the right-side module; the upper side module of the transverse edge joint lightens the bottommost row of LED pixels, and the lower side module lightens the 3 rd row and the 6 th row of LED pixels.
For all inter-module seams in the display unit, the LED pixels in the second last column of the left-side module of the vertical edge seam are brightened, and the LED pixels in the 2 nd column and the 5 th column are brightened by the right-side module; the upper side module of the transverse edge joint lightens the LED pixels in the penultimate row, and the lower side module lightens the LED pixels in the rows 2 and 5.
The increment proportion of the LED pixels is equal to the joint LED pixel spacing of the joint where the LED pixels are located divided by the standard LED pixel spacing; the LED display unit is a display box body, and the pixel spacing of the seam LED and the pixel spacing of the standard LED are obtained by adopting the following method:
Step one), aiming at the vertical edge joint among all modules in the display box body, lighting single-base color LED pixels centered in red, green and blue in total 3 rows of LED crystal elements with N rows at two sides of the vertical edge joint;
step two), the digital camera is held, and the view finding frame aims at the display box body to take a picture, so that a picture of the display box body is obtained;
step three) envelope method: setting the length of the long strip as the width of the camera view field, and setting the width of the long strip as D0 rows of camera pixels; intercepting brightness data of camera pixels in a long strip from a first row, calculating a brightness data average value of the D0 row camera pixels of each column, and forming an envelope by the brightness data average value of the camera pixels of each column in the long strip; if the peak values of all the envelope peaks are smaller than the gray threshold value H0, the strip moves downwards until the peak value > H0 of the envelope peak appears, and 1/2 of the peak value of the highest envelope peak is defined as H1 to replace H0; calculating the distance D1 between adjacent envelope peaks, and replacing D0 with half of the value of D1 to be used as the width of a new long strip;
step four), moving down the long strip, continuously intercepting the brightness data of the camera pixels in the long strip according to half of the value of the new strip width D1, calculating the average value of the brightness data of each column of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each column of camera pixels in the long strip; calculating the positions of the spot centers of the corresponding three LED pixels according to the average value of the brightness data of each row of camera pixels of the continuous 3 envelope peaks; calculating the pixel spacing of the edge joint LED and the pixel spacing of the standard LED at the edge joint according to the positions of the light spot centers of the three LED pixels; the standard LED pixel spacing and the seam LED pixel spacing at the seam of the vertical edges between every two adjacent modules of the whole display box body are obtained;
Step five), the same principle is adopted, and aiming at the transverse edge joint between all modules in the display box body, single-base-color LED pixels centered in red, green and blue in 3 rows of LED crystal elements which are separated by N rows on the upper side and the lower side of the transverse edge joint are lightened; setting the length of the long strip as the height of the camera view field, setting the width of the long strip as D0, and obtaining the standard LED pixel spacing and the seam LED pixel spacing at the seam between the adjacent modules of the display box body according to the method of the second to fourth steps.
The increment proportion of the LED pixels can be equal to the average joint spacing of the module joint where the LED pixels are located divided by the average standard spacing; the average standard spacing and the average seam spacing are obtained by the following method:
step one), aiming at the vertical edge joint among all modules in the display box body, lighting single-base color LED pixels centered in red, green and blue in total 3 rows of LED crystal elements with N rows at two sides of the vertical edge joint;
step two), the digital camera is held, and the view finding frames aim at the display boxes to take pictures, so that the pictures of the display boxes are obtained;
step three) envelope method: setting the length of the long strip as the width of the camera view field, and setting the width of the long strip as D0 rows of camera pixels; intercepting brightness data of camera pixels in a long strip from a first row, calculating a brightness data average value of the D0 row camera pixels of each column, and forming an envelope by the brightness data average value of the camera pixels of each column in the long strip; if the peak values of all the envelope peaks are smaller than the gray threshold value H0, the strip moves downwards until the peak value > H0 of the envelope peak appears, and 1/2 of the peak value of the highest envelope peak is defined as H1 to replace H0; calculating the distance D1 between adjacent envelope peaks, and replacing D0 with half of the value of D1 to be used as the width of a new long strip;
Step four), moving down the long strip, continuously intercepting the brightness data of the camera pixels in the long strip according to half of the value of the new strip width D1, calculating the average value of the brightness data of each column of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each column of camera pixels in the long strip; calculating the positions of the spot centers of the corresponding three LED pixels according to the average value of the brightness data of each row of camera pixels of the continuous 3 envelope peaks; calculating the pixel spacing of the edge joint LED and the pixel spacing of the standard LED at the edge joint according to the positions of the light spot centers of the three LED pixels; the standard LED pixel spacing and the seam LED pixel spacing at the seam of the vertical edges between every two adjacent modules of the whole display box body are obtained;
step five), the same principle is adopted, and aiming at the transverse edge joint between all modules in the display box body, single-base-color LED pixels centered in red, green and blue in 3 rows of LED crystal elements which are separated by N rows on the upper side and the lower side of the transverse edge joint are lightened; setting the length of the long strip as the height of the camera view field, setting the width of the long strip as D0, and obtaining the standard LED pixel spacing and the seam LED pixel spacing at the seam between the adjacent modules of the display box body according to the method of the second to fourth steps;
step six), aiming at the vertical edge joint of any pair of adjacent modules, calculating the average value of all the standard LED pixel pitches between the starting point and the finishing point of the vertical edge of the pair of adjacent modules to be the average standard pitch of the pair of adjacent modules, wherein the average value of all the joint LED pixel pitches is the average joint pitch of the pair of adjacent modules;
In the fourth step, the precise position of the center of the LED pixel spot can be calculated by the following two methods:
the method comprises the following steps: and regarding the part with the peak value larger than the threshold value H1 as a brightness envelope effective part, multiplying the X coordinates of each row of camera pixels in the brightness envelope effective part by the X coordinates of the row of camera pixels to obtain the barycentric coordinate components of the row of camera pixels by taking the average value of the brightness data of each row of camera pixels in the brightness envelope effective part as a weight, summing all barycentric coordinate components in the brightness envelope effective part, calculating the brightness barycenter as the central X coordinates of a row of LED pixel facula, and determining the accurate position of the LED pixels.
The second method is as follows: the portion where the peak value is greater than the threshold H1 is regarded as an envelope effective portion; and (3) carrying out curve fitting on the average value of the brightness data of all the rows of camera pixels in the brightness envelope effective part to obtain the X coordinate of the highest peak point of the envelope peak, and taking the X coordinate as the X coordinate of the spot center of the LED pixel in one row, thereby determining the accurate position of the LED pixel.
The LED display unit is a display screen, and the pixel spacing of the seam LED and the pixel spacing of the standard LED are obtained by adopting the following method:
step one), aiming at the vertical edge joint between all modules of each display box body in a display screen, lighting single-base-color LED pixels centered in red, green and blue in 3 rows of LED crystal elements separated by N rows at two sides of the vertical edge joint; LED pixels for displaying the serial numbers of the display boxes are lightened in two transverse modules in the center of each display box: the view finding frames of the digital cameras are sequentially aligned with the display boxes to take pictures, so that display box photos are obtained;
Step two), the digital camera is held, and the view finding frames aim at the display boxes to take pictures, so that the pictures of the display boxes are obtained; determining and recording the position of the display box body corresponding to each photo in the display screen according to the number on the photo, and then selling the number; the pin number method is as follows: setting a pin number gray threshold H0', wherein the gray is kept unchanged if the gray value of the LED pixel in the display number area is smaller than the pin number gray threshold H0', and the gray value of the LED pixel is changed to H0 'if the gray value of the LED pixel is larger than or equal to the pin number gray threshold H0';
step three) envelope method: for any display box body, setting the length of a long strip as the width of a camera view field, and setting the width of the long strip as D0 rows of camera pixels; intercepting brightness data of camera pixels in a long strip from a first row, calculating a brightness data average value of the D0 row camera pixels of each column, and forming an envelope by the brightness data average value of the camera pixels of each column in the long strip; if the peak values of all the envelope peaks are smaller than the gray threshold value H0, the strip moves downwards until the peak value > H0 of the envelope peak appears, and 1/2 of the peak value of the highest envelope peak is defined as H1 to replace H0; calculating the distance D1 between adjacent envelope peaks, and replacing D0 with half of the value of D1 to be used as the width of a new long strip;
Step four), moving down the long strip, continuously intercepting the brightness data of the camera pixels in the long strip according to half of the value of the new strip width D1, calculating the average value of the brightness data of each column of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each column of camera pixels in the long strip; calculating the positions of the spot centers of the corresponding three LED pixels according to the average value of the brightness data of each row of camera pixels of the continuous 3 envelope peaks; calculating the pixel spacing of the edge joint LED and the pixel spacing of the standard LED at the edge joint according to the positions of the light spot centers of the three LED pixels; the standard LED pixel spacing and the seam LED pixel spacing at the seam of the vertical edges between every two adjacent modules of the whole display box body are obtained;
step five), the same principle is adopted, and aiming at the transverse edge joint between all modules in the display box body, single-base-color LED pixels centered in red, green and blue in 3 rows of LED crystal elements which are separated by N rows on the upper side and the lower side of the transverse edge joint are lightened; setting the length of the long strip as the height of the camera view field, setting the width of the long strip as D0, and obtaining the standard LED pixel spacing and the seam LED pixel spacing at the seam between the adjacent modules of the display box body according to the method of the second to fourth steps;
and repeating the second to fifth steps to obtain the standard LED pixel spacing and the seam LED pixel spacing at the seam of the transverse edges between all adjacent modules in all display boxes of the display screen.
The size of N is not strictly limited, but N is preferably 1.ltoreq.N.ltoreq.6.
The invention lightens 3 rows of LED pixels at intervals at two sides of a vertical edge joint aiming at all inter-module joints in a display unit, and 3 rows of LED pixels at intervals of N rows at two sides of a horizontal edge joint; multiplying the brightness enhancement proportion of the brightness enhancement LED pixels by the original correction coefficient to obtain a correction coefficient; correcting the brightness of the LED pixels by using a correction coefficient, so that automatic optical seam repair can be completed; when the high-density small-spacing LED display product is applied, the optical gaps are not easy to distinguish due to the too high density, and the accuracy of data acquisition is affected; the camera can be used for photographing through the handheld camera to obtain a photograph of the display box body, and the correction precision is not influenced by the inclination angle and geometric distortion of the photograph, so that the operation is simple and convenient, the pixel identification capability is high, the positioning is accurate, and the correction precision is high.
Drawings
The invention will be described in further detail with reference to the drawings and the specific examples.
Fig. 1 shows a grid card diagram of a case according to embodiment 1 of the present invention.
Fig. 2 shows a grid card diagram of a case according to embodiment 2 of the present invention.
Fig. 3 shows a grid card diagram of a case according to embodiment 3 of the present invention.
Fig. 4 shows a grid card diagram of a case according to embodiment 4 of the present invention.
FIG. 5a is a schematic view of LED pixels on two sides of a vertical edge seam; FIG. 5b is a schematic view of LED pixels in a row spaced apart from each other on both sides of a seam; FIG. 5c illustrates a schematic view of two rows of LED pixels spaced apart from each other on both sides of a vertical edge seam; fig. 5d is a schematic view of two rows of LED pixels on two sides of the edge seam.
FIGS. 6a and 6b are schematic views showing the gradual downward movement of the strip; in the figure, 1. Camera field of view, 2. Long stripe, 3.Led pixels.
Fig. 7 is a schematic view of a column average envelope of a row of long strips of a single display box, wherein the abscissa represents the X-coordinate of a camera pixel and the ordinate represents the brightness value of the camera pixel.
Fig. 8 is a schematic diagram of a set of 3 consecutive envelope peaks in a row of long strips, wherein the abscissa indicates the X-coordinate of the camera pixel and the ordinate indicates the brightness value of the camera pixel.
Detailed Description
Example 1: brightness enhancement mode for display box body with 1 row and 1 column
As shown in fig. 1, the method for correcting the brightness of the pixel pitch of the display unit of the invention is as follows: for all inter-module seams in the display unit, the last row of LED pixels of the left-side module of the vertical edge seam are brightened, and the right-side module brightens the 2 nd row of LED pixels and the 4 th row of LED pixels; the upper edge module of the transverse edge joint brightens the LED pixels at the bottommost row, and the lower edge module brightens the LED pixels at the 2 nd and 4 th rows; multiplying the brightness enhancement proportion of the brightness enhancement LED pixels by the original correction coefficient to obtain a correction coefficient; and correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam repair.
Wherein the incremental ratio of the LED pixels is equal to the tile LED pixel pitch (i.e., the pitch between the LED pixels at the edges of the tile) at the tile where the LED pixels are located divided by the standard LED pixel pitch (i.e., the LED pixel pitch inside the tile).
The increment ratio of the LED pixels can be equal to the average joint gap between the vertical edges (or the horizontal edges) of the module where the LED pixels are located divided by the average standard gap (namely the LED pixel gap inside the module).
Example 2: brightness enhancement mode for display box body with 1 row and 1 column
As shown in fig. 2, the method for correcting the brightness of the pixel space spanned by the display unit seam of the invention comprises the following steps: for all inter-module seams in the display unit, brightening the LED pixels in the last two rows of the left-side modules of the vertical edge seam and brightening the LED pixels in the 1 st and 3 rows of the right-side modules; the upper edge module of the transverse edge joint brightens the LED pixels in the penultimate row, and the lower edge module brightens the LED pixels in the 1 st row and the 3 rd row; multiplying the brightness enhancement proportion of the brightness enhancement LED pixels by the original correction coefficient to obtain a correction coefficient; and correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam repair.
Wherein the incremental ratio of the LED pixels is equal to the tile LED pixel pitch (i.e., the pitch between the LED pixels at the edges of the tile) at the tile where the LED pixels are located divided by the standard LED pixel pitch (i.e., the LED pixel pitch inside the tile).
The increment ratio of the LED pixels can be equal to the average joint gap between the vertical edges (or the horizontal edges) of the module where the LED pixels are located divided by the average standard gap (namely the LED pixel gap inside the module).
Example 3: brightness enhancement mode for display box body with 2 rows and 2 columns
As shown in fig. 3, the method for correcting the brightness of the pixel space spanned by the display unit seam of the invention comprises the following steps: for all inter-module seams in the display unit, the last row of LED pixels of the left-side module of the vertical edge seam are brightened, and the 3 rd row and the 6 th row of LED pixels are brightened by the right-side module; the upper side module of the transverse edge joint brightens the LED pixels at the bottommost row, and the lower side module brightens the LED pixels at the 3 rd and 6 th rows; multiplying the brightness enhancement proportion of the brightness enhancement LED pixels by the original correction coefficient to obtain a correction coefficient; and correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam repair.
Wherein the incremental ratio of the LED pixels is equal to the tile LED pixel pitch (i.e., the pitch between the LED pixels at the edges of the tile) at the tile where the LED pixels are located divided by the standard LED pixel pitch (i.e., the LED pixel pitch inside the tile).
The increment ratio of the LED pixels can be equal to the average joint gap between the vertical edges (or the horizontal edges) of the module where the LED pixels are located divided by the average standard gap (namely the LED pixel gap inside the module).
Example 4: brightness enhancement mode for display box body with 2 rows and 2 columns
As shown in fig. 4, the method for correcting the brightness of the pixel pitch of the display unit of the invention is as follows: for all inter-module seams in the display unit, the LED pixels in the last second row of the left-side modules of the vertical edge seam are brightened, and the LED pixels in the 2 nd and 5 th rows are brightened by the right-side modules; the upper edge module of the transverse edge joint brightens the LED pixels in the penultimate row, and the lower edge module brightens the LED pixels in the rows 2 and 5; multiplying the brightness enhancement proportion of the brightness enhancement LED pixels by the original correction coefficient to obtain a correction coefficient; and correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam repair.
Wherein the incremental ratio of the LED pixels is equal to the tile LED pixel pitch (i.e., the pitch between the LED pixels at the edges of the tile) at the tile where the LED pixels are located divided by the standard LED pixel pitch (i.e., the LED pixel pitch inside the tile).
The increment ratio of the LED pixels can be equal to the average joint gap between the vertical edges (or the horizontal edges) of the module where the LED pixels are located divided by the average standard gap (namely the LED pixel gap inside the module).
The display unit can be a display box body, wherein the pixel pitch of the joint LED and the pixel pitch of the standard LED can be obtained by a conventional distance measuring method, and the pixel pitch can also be obtained by the following method:
Step one), as shown in fig. 5a, for all the vertical edge seams among the modules in the display box, the single-color LED pixels centered in red, green and blue in the last column of the left edge seam module and the 2 nd and 4 th columns (or the penultimate column of the left edge module and the 1 st and 3 rd columns of the right edge module) of the LED crystal cells of the vertical edge seam are lightened; because the red, green and blue tube cores are generally arranged linearly, the positions of the LED pixels with the intermediate primary colors can represent the accurate positions of the LED wafers, and the positioning is more accurate; thus, three columns of single-primary-color LED pixels are displayed at the vertical edge joints of all the modules, and the three columns of single-primary-color LED pixels comprise not only the standard LED pixel spacing at the vertical edge joints, but also the joint LED pixel spacing at the vertical edge joints.
Step two), a digital camera of any model is held, the view finding frame is aligned to the display box body, the camera lens is adjusted to enable the display box body to be full of the whole view finding frame, and about 5% of the margin on each side is guaranteed to take a picture, so that a picture of the display box body is obtained.
Step three) envelope method: assume that 4620 columns of camera pixels are contained within the camera field of view, as shown in FIG. 6 a; setting the length of the long strip as the width of the camera view field (namely 4620 columns of camera pixel width), wherein the width D0 of the long strip is 50 rows of camera pixels (wherein the width D0 is not strictly limited, and the number of rows of camera pixels in the camera view field is generally divided by the number of rows of LED pixels in the display box to be rounded); taking the brightness data of the camera pixels in the long strip from the first row (the first row above), calculating the average value of the brightness data for the 50 rows of camera pixels in each column, and forming an envelope by the average value of the brightness data of the camera pixels in each column in the long strip; if the peaks of all the envelope peaks are smaller than the gray threshold H0, the strip is shifted down, as shown in fig. 6b, until the peak value > H0 of the envelope peak appears, and 1/2 of the peak value of the highest envelope peak is defined as H1 instead of H0, wherein the width H0 is not strictly limited, the trough with the highest index value is generally adopted, or about 15% of the maximum possible brightness of the lighted LED pixel is adopted; h0=40 is set in the present embodiment; the distance D1 between adjacent envelope peaks is calculated and half the value of D1 is substituted for D0 as the width of the new long strip.
Step four), moving down the long strip, continuously intercepting the brightness data of the camera pixels in the long strip according to half of the value of the new strip width D1, calculating the average value of the brightness data of each column of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each column of camera pixels in the long strip; only a single envelope peak and only 2 envelope peaks in succession are ignored; when the continuous 3 envelope peaks appear, accurately calculating the accurate positions of the spot centers of the corresponding three LED pixels according to the average value of the brightness data of each column of camera pixels at the envelope peaks; the accurate positions of the light spot centers of the three LED pixels can be used for calculating the distance between the light spot centers of 2 adjacent LED pixels, and the distance between the light spot centers of the 1 st LED pixel and the 2 nd LED pixel is the sum of the pixel distance of the joint LED at the joint of the vertical edge and the pixel distance of the standard LED; the distance between the centers of the light spots of the 2 nd and 3 rd LED pixels is 2 times of the distance between the standard LED pixels at the edge joint. Therefore, the pixel spacing of the edge joint LED and the pixel spacing of the standard LED at the edge joint can be obtained.
Step five), continuously moving down the long strip, calculating the average value of the brightness data of each column of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each column of camera pixels, wherein as shown in fig. 7, for a display box spliced by four modules, the complete envelope comprises 12 envelope peaks; the pixel spacing of the standard LED and the pixel spacing of the seam LED at the seam of the vertical side corresponding to the 3 envelope peaks can be calculated according to the accurate positions of the 3 envelope peaks; and the like, obtaining the standard LED pixel spacing and the seam LED pixel spacing at the seam of the vertical edges between every two adjacent modules of the whole display box body.
For the vertical edge seam of any pair of adjacent modules, the average value of all the standard LED pixel pitches between the starting point and the finishing point of the vertical edge of the pair of adjacent modules is calculated to be the average standard pitch of the pair of adjacent modules, and the average value of all the seam LED pixel pitches is calculated to be the average seam pitch of the pair of adjacent modules.
Step six), the same principle is adopted, and aiming at the transverse edge joint among all modules in the display box body, as shown in fig. 5b, the LED pixels at the bottommost row of the upper edge module of the transverse edge joint are lightened, and the LED pixels at the 2 nd row and the 4 th row of the lower edge module (or the last row of the upper edge module and the 1 st row and the 3 rd row of the lower edge module) are respectively LED pixels with single primary color which are centered in red, green and blue; setting the length of the long strip as the height of the camera view field, setting the width D0 of the long strip as 50 rows of camera pixels, and obtaining the standard LED pixel spacing and the seam LED pixel spacing, and the average standard spacing and the average seam spacing at the seam between every two adjacent modules of the display box body according to the method of the second to fifth steps.
In the fourth step, the precise position of the center of the LED pixel spot can be calculated by the following two methods:
the method comprises the following steps: and regarding the part with the peak value larger than the threshold value H1 as a brightness envelope effective part, multiplying the X coordinates of each row of camera pixels in the brightness envelope effective part by the X coordinates of the row of camera pixels to obtain the barycentric coordinate components of the row of camera pixels by taking the average value of the brightness data of each row of camera pixels in the brightness envelope effective part as a weight, summing all barycentric coordinate components in the brightness envelope effective part, calculating the brightness barycenter as the central X coordinates of a row of LED pixel facula, and determining the accurate position of the LED pixels.
The second method is as follows: the portion where the peak value is greater than the threshold H1 is regarded as an envelope effective portion; and (3) carrying out curve fitting on the average value of the brightness data of all the rows of camera pixels in the brightness envelope effective part to obtain the X coordinate of the highest peak point of the envelope peak, and taking the X coordinate as the X coordinate of the spot center of the LED pixel in one row, thereby determining the accurate position of the LED pixel.
In the method for obtaining the pixel pitch of the edge joint LED and the pixel pitch of the standard LED, as shown in fig. 5c, the single-color LED pixels centered in red, green and blue in the LED wafer of the last column of the left edge joint module and the 3 rd and 6 th columns of the right edge joint module (or the last column of the left edge module and the 2 nd and 5 th columns of the right edge module) can be also lightened; as shown in fig. 5d, the bottom-most row of LED pixels of the upper edge module of the lateral edge joint is turned on, and the 3 rd and 6 th rows of LED pixels (or the penultimate row of the upper edge module and the 2 nd and 5 th rows of the lower edge module) of the lower edge module are LED pixels with single primary color centered in red, green and blue. At the moment, the distance between the centers of the spots of the 1 st LED pixel and the 2 nd LED pixel is the sum of the pixel distance of the joint LED at the joint of the vertical edge and the pixel distance of the 2 times standard LED; the distance between the centers of the light spots of the 2 nd LED pixel and the 3 rd LED pixel is 3 times of the distance between the standard LED pixels at the edge joint. Therefore, the pixel spacing of the edge joint LED and the pixel spacing of the standard LED at the edge joint can be obtained.
If the brightness enhancement ratio of the vertical edge seam and the horizontal edge seam between the modules in the display box body is repeatedly calculated, the latter is the case; for example, four LED pixels near the intersection of the vertical edge seam and the horizontal edge seam can obtain a corrected luminance coefficient by multiplying the luminance enhancement ratio of the vertical edge seam by the original correction coefficient and obtain a corrected luminance coefficient by multiplying the luminance enhancement ratio of the horizontal edge seam by the original correction coefficient, and the correction coefficients finally loaded by the four LED pixels are corrected luminance coefficients obtained by multiplying the luminance enhancement ratio of the horizontal edge seam by the original correction coefficient.
The display unit can also be a display screen formed by splicing a plurality of display boxes; at this time, the pixel distance of the LED of the joint of each display box body and the pixel distance of the standard LED in the display screen can be obtained by a conventional distance measuring method, and can also be obtained by the following method:
step one), as shown in fig. 5a, aiming at the vertical edge seams among all modules in each display box of the display screen, the single-base color LED pixels centered in red, green and blue in the LED crystal cells of the last column of the left edge seam module and the 2 nd and 4 th columns of the right edge seam module (or the last column of the left edge module and the 1 st and 3 rd columns of the right edge module) are lightened; because the red, green and blue tube cores are generally arranged linearly, the positions of the LED pixels with the intermediate primary colors can represent the accurate positions of the LED wafers, and the positioning is more accurate; three columns of single-primary-color LED pixels are displayed at the vertical edge joints of all the modules, and the three columns of single-primary-color LED pixels comprise standard LED pixel spacing at the vertical edge joints and joint LED pixel spacing at the vertical edge joints; LED pixels for displaying the serial numbers of the display boxes are lightened in two transverse modules in the center of each display box: the left module displays the column number and the right module displays the row number.
Step two), holding any type of digital camera, aligning the view finding frames with each display box, adjusting camera lenses to enable the display boxes to be full of the whole view finding frames, and guaranteeing about 5% of room on each side to take pictures to obtain photos of each display box; and reading the photo files of the display boxes, determining the positions of the display boxes corresponding to the photos in the display screen according to the row and column numbers on the photos, and then selling the numbers. The pin number method is as follows: setting a pin gray threshold H0' =40; the gray scale of the LED pixel with the gray scale value smaller than H0' in the display number area is kept unchanged, and the gray scale value of the LED pixel with the gray scale value larger than H0' is changed into H0'. The purpose of the pin number is to ensure that the average value of the row and column numbers of the display box body is smaller than H 0 ' not interpreted as LED pixels; h 0 ' typically takes about 15% of the maximum possible brightness of the illuminated LED pixel.
Step three) envelope method: for any display box, assume that the camera field of view contains 4620 columns of camera pixels, as shown in FIG. 6 a; setting the length of the long strip as the width of the camera view field (namely 4620 columns of camera pixel width), wherein the width D0 of the long strip is 50 rows of camera pixels (wherein the width D0 is not strictly limited, and the number of rows of camera pixels in the camera view field is generally divided by the number of rows of LED pixels in the display box to be rounded); taking the brightness data of the camera pixels in the long strip from the first row (the first row above), calculating the average value of the brightness data for the 50 rows of camera pixels in each column, and forming an envelope by the average value of the brightness data of the camera pixels in each column in the long strip; if the peak values of all the envelope peaks are smaller than the gray threshold H0, the strip is shifted down, as shown in fig. 6b, until the peak value > H0 of the envelope peak appears, 1/2 of the peak value of the highest envelope peak is defined as H1 instead of H0, wherein the width H0 is not strictly limited, and is generally about 15% of the maximum possible brightness of the lighted LED pixel; h0=40 is set in the present embodiment; the distance D1 between adjacent envelope peaks is calculated and half the value of D1 is substituted for D0 as the width of the new long strip.
Step four), moving down the long strip, continuously intercepting the brightness data of the camera pixels in the long strip according to half of the value of the new strip width D1, calculating the average value of the brightness data of each column of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each column of camera pixels in the long strip; only a single envelope peak and only 2 envelope peaks in succession are ignored; when the continuous 3 envelope peaks appear, accurately calculating the accurate positions of the spot centers of the corresponding three LED pixels according to the average value of the brightness data of each column of camera pixels at the envelope peaks; the accurate positions of the light spot centers of the three LED pixels can be used for calculating the distance between the light spot centers of 2 adjacent LED pixels, and the distance between the light spot centers of the 1 st LED pixel and the 2 nd LED pixel is the sum of the pixel distance of the joint LED at the joint of the vertical edge and the pixel distance of the standard LED; the distance between the centers of the light spots of the 2 nd and 3 rd LED pixels is 2 times of the distance between the standard LED pixels at the edge joint. Therefore, the pixel spacing of the edge joint LED and the pixel spacing of the standard LED at the edge joint can be obtained.
Step five), continuously moving down the long strip, calculating the average value of the brightness data of each row of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each row of camera pixels, wherein as shown in fig. 7, for a display box spliced by four modules, the complete envelope comprises 12 envelope peaks, and as the camera is aimed at each lighted display box to ensure about 5% of the space on each side when shooting, for the display box on the left side edge on a display unit, the complete envelope comprises 14 envelope peaks, for the display box on the left side edge on the display box, the complete envelope comprises 13 envelope peaks, and for the display box in the middle of the display box, the complete envelope comprises 15 envelope peaks; as shown in fig. 8, the standard LED pixel pitch and the pixel pitch of the seam LED at the seam of the vertical side corresponding to the 3 envelope peaks can be calculated from the precise positions of the continuous 3 envelope peaks; and the like, obtaining the standard LED pixel spacing and the seam LED pixel spacing at the seam of the vertical edges between every two adjacent modules of the whole display box body.
For the vertical edge seam of any pair of adjacent modules, the average value of all the standard LED pixel pitches between the starting point and the finishing point of the vertical edge of the pair of adjacent modules is calculated to be the average standard pitch of the pair of adjacent modules, and the average value of all the seam LED pixel pitches is calculated to be the average seam pitch of the pair of adjacent modules.
Step six), the same principle is adopted, and aiming at the transverse edge joint among all modules in the display box body, as shown in fig. 5b, the LED pixels at the bottommost row of the upper edge module of the transverse edge joint are lightened, and the LED pixels at the 2 nd row and the 4 th row of the lower edge module (or the last row of the upper edge module and the 1 st row and the 3 rd row of the lower edge module) are respectively LED pixels with single primary color which are centered in red, green and blue; setting the length of the long strip as the height of the camera view field, setting the width D0 of the long strip as 50 rows of camera pixels, and obtaining the standard LED pixel spacing and the seam LED pixel spacing, and the average standard spacing and the average seam spacing at the seam between every two adjacent modules of the display box body according to the method of the second to fifth steps.
And repeating the steps three to six to obtain the standard LED pixel spacing and the seam LED pixel spacing at the seam of the transverse edges between all adjacent modules in all display boxes of the display screen.
In the fourth step, the precise position of the center of the LED pixel spot can be calculated by the following two methods:
The method comprises the following steps: and regarding the part with the peak value larger than the threshold value H1 as a brightness envelope effective part, multiplying the X coordinates of each row of camera pixels in the brightness envelope effective part by the X coordinates of the row of camera pixels to obtain the barycentric coordinate components of the row of camera pixels by taking the average value of the brightness data of each row of camera pixels in the brightness envelope effective part as a weight, summing all barycentric coordinate components in the brightness envelope effective part, calculating the brightness barycenter as the central X coordinates of a row of LED pixel facula, and determining the accurate position of the LED pixels.
The second method is as follows: the portion where the peak value is greater than the threshold H1 is regarded as an envelope effective portion; and (3) carrying out curve fitting on the average value of the brightness data of all the rows of camera pixels in the brightness envelope effective part to obtain the X coordinate of the highest peak point of the envelope peak, and taking the X coordinate as the X coordinate of the spot center of the LED pixel in one row, thereby determining the accurate position of the LED pixel.
Claims (9)
1. A display unit seam crossing type pixel interval brightness correction method is characterized by comprising the following steps: for all inter-module seams in the display unit, brightening 3 rows of LED pixels which are separated by N rows at two sides of the vertical edge seam and 3 rows of LED pixels which are separated by N rows at two sides of the horizontal edge seam; multiplying the brightness enhancement proportion of the brightness enhancement LED pixels by the original correction coefficient to obtain a correction coefficient; correcting the brightness of the LED pixels by using a correction coefficient to finish optical seam repair; the increment proportion of the LED pixels is equal to the joint LED pixel spacing of the joint where the LED pixels are located divided by the standard LED pixel spacing; the display unit is a display box body, and the pixel spacing of the seam LED and the pixel spacing of the standard LED are obtained by adopting the following method:
Step one), aiming at the vertical edge joint among all modules in the display box body, lighting single-base color LED pixels centered in red, green and blue in total 3 rows of LED crystal elements with N rows at two sides of the vertical edge joint;
step two), the digital camera is held, and the view finding frame aims at the display box body to take a picture, so that a picture of the display box body is obtained;
step three) envelope method: setting the length of the long strip as the width of the camera view field, and setting the width of the long strip as D0 rows of camera pixels; intercepting brightness data of camera pixels in a long strip from a first row, calculating a brightness data average value of the D0 row camera pixels of each column, and forming an envelope by the brightness data average value of the camera pixels of each column in the long strip; if the peak values of all the envelope peaks are smaller than the gray threshold value H0, the strip moves downwards until the peak value > H0 of the envelope peak appears, and 1/2 of the peak value of the highest envelope peak is defined as H1 to replace H0; calculating the distance D1 between adjacent envelope peaks, and replacing D0 with half of the value of D1 to be used as the width of a new long strip;
step four), moving down the long strip, continuously intercepting the brightness data of the camera pixels in the long strip according to half of the value of the new strip width D1, calculating the average value of the brightness data of each column of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each column of camera pixels in the long strip; calculating the positions of the spot centers of the corresponding three LED pixels according to the average value of the brightness data of each row of camera pixels of the continuous 3 envelope peaks; calculating the pixel spacing of the edge joint LED and the pixel spacing of the standard LED at the edge joint according to the positions of the light spot centers of the three LED pixels; the standard LED pixel spacing and the seam LED pixel spacing at the seam of the vertical edges between every two adjacent modules of the whole display box body are obtained;
Step five), the same principle is adopted, and aiming at the transverse edge joint between all modules in the display box body, single-base-color LED pixels centered in red, green and blue in 3 rows of LED crystal elements which are separated by N rows on the upper side and the lower side of the transverse edge joint are lightened; setting the length of the long strip as the height of the camera view field, setting the width of the long strip as D0, and obtaining the standard LED pixel spacing and the seam LED pixel spacing at the seam between the adjacent modules of the display box body according to the method of the second to fourth steps.
2. The display unit seam crossing pixel pitch brightness correction method of claim 1, wherein for all inter-module seams in the display unit, the last column of LED pixels of a left module of the vertical seam are brightened, and the right module brightens the 2 nd and 4 th columns of LED pixels; the upper edge module of the transverse edge joint lightens the LED pixels at the bottommost row, and the lower edge module lightens the LED pixels at the 2 nd and 4 th rows.
3. The display unit seam crossing pixel pitch brightness correction method of claim 1, wherein for all inter-module seams in a display unit, the left module penultimate column of LED pixels of the vertical seam is brightened, and the right module brightens the 1 st and 3 rd columns of LED pixels; the upper side module of the transverse edge joint lightens the LED pixels in the penultimate row, and the lower side module lightens the LED pixels in the 1 st row and the 3 rd row.
4. The display unit seam crossing pixel pitch brightness correction method of claim 1, wherein for all inter-module seams in the display unit, the last column of LED pixels of the left module of the vertical seam are brightened, and the 3 rd and 6 th columns of LED pixels are brightened by the right module; the upper side module of the transverse edge joint lightens the bottommost row of LED pixels, and the lower side module lightens the 3 rd row and the 6 th row of LED pixels.
5. The display unit seam crossing pixel pitch brightness correction method of claim 1, wherein for all inter-module seams in a display unit, the left module penultimate column of LED pixels of the vertical seam is brightened, and the right module brightens the 2 nd and 5 th columns of LED pixels; the upper side module of the transverse edge joint lightens the LED pixels in the penultimate row, and the lower side module lightens the LED pixels in the rows 2 and 5.
6. A display unit seam crossing type pixel interval brightness correction method is characterized by comprising the following steps: for all inter-module seams in the display unit, brightening 3 rows of LED pixels which are separated by N rows at two sides of the vertical edge seam and 3 rows of LED pixels which are separated by N rows at two sides of the horizontal edge seam; multiplying the brightness enhancement proportion of the brightness enhancement LED pixels by the original correction coefficient to obtain a correction coefficient; correcting the brightness of the LED pixels by using a correction coefficient to finish optical seam repair; the increment proportion of the LED pixels is equal to the average joint spacing of the module joint where the LED pixels are located divided by the average standard spacing; the display unit is a display box body, and the average standard spacing and the average seam spacing are obtained by adopting the following method:
Step one), aiming at the vertical edge joint among all modules in the display box body, lighting single-base color LED pixels centered in red, green and blue in total 3 rows of LED crystal elements with N rows at two sides of the vertical edge joint;
step two), the digital camera is held, and the view finding frames aim at the display boxes to take pictures, so that the pictures of the display boxes are obtained;
step three) envelope method: setting the length of the long strip as the width of the camera view field, and setting the width of the long strip as D0 rows of camera pixels; intercepting brightness data of camera pixels in a long strip from a first row, calculating a brightness data average value of the D0 row camera pixels of each column, and forming an envelope by the brightness data average value of the camera pixels of each column in the long strip; if the peak values of all the envelope peaks are smaller than the gray threshold value H0, the strip moves downwards until the peak value > H0 of the envelope peak appears, and 1/2 of the peak value of the highest envelope peak is defined as H1 to replace H0; calculating the distance D1 between adjacent envelope peaks, and replacing D0 with half of the value of D1 to be used as the width of a new long strip;
step four), moving down the long strip, continuously intercepting the brightness data of the camera pixels in the long strip according to half of the value of the new strip width D1, calculating the average value of the brightness data of each column of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each column of camera pixels in the long strip; calculating the positions of the spot centers of the corresponding three LED pixels according to the average value of the brightness data of each row of camera pixels of the continuous 3 envelope peaks; calculating the pixel spacing of the edge joint LED and the pixel spacing of the standard LED at the edge joint according to the positions of the light spot centers of the three LED pixels; the standard LED pixel spacing and the seam LED pixel spacing at the seam of the vertical edges between every two adjacent modules of the whole display box body are obtained;
Step five), the same principle is adopted, and aiming at the transverse edge joint between all modules in the display box body, single-base-color LED pixels centered in red, green and blue in 3 rows of LED crystal elements which are separated by N rows on the upper side and the lower side of the transverse edge joint are lightened; setting the length of a long strip as the height of a camera view field, setting the width of the long strip as D0, and obtaining the standard LED pixel spacing and the seam LED pixel spacing at the seam between the adjacent modules of the display box body according to the method of the second to fourth steps;
step six), aiming at the vertical edge seam of any pair of adjacent modules, calculating the average value of all the standard LED pixel pitches between the starting point and the finishing point of the vertical edge of the pair of adjacent modules to be the average standard pitch of the pair of adjacent modules, and the average value of all the seam LED pixel pitches to be the average seam pitch of the pair of adjacent modules.
7. The method for correcting the brightness of the pixel pitch across the display unit seam of claim 6, wherein in the fourth step, the position of the center of the LED pixel spot is calculated by the following method:
and regarding the part with the peak value larger than the threshold value H1 as a brightness envelope effective part, multiplying the X coordinates of each row of camera pixels in the brightness envelope effective part by the X coordinates of the row of camera pixels to obtain the barycentric coordinate components of the row of camera pixels by taking the average value of the brightness data of each row of camera pixels in the brightness envelope effective part as a weight, summing all barycentric coordinate components in the brightness envelope effective part, calculating the brightness barycenter as the central X coordinates of a row of LED pixel facula, and determining the accurate position of the LED pixels.
8. The method for correcting the brightness of the pixel pitch across the display unit seam of claim 6, wherein in the fourth step, the position of the center of the LED pixel spot is calculated by the following method:
the portion where the peak value is greater than the threshold H1 is regarded as an envelope effective portion; and (3) carrying out curve fitting on the average value of the brightness data of all the rows of camera pixels in the brightness envelope effective part to obtain the X coordinate of the highest peak point of the envelope peak, and taking the X coordinate as the X coordinate of the spot center of the LED pixel in one row, thereby determining the accurate position of the LED pixel.
9. A display unit seam crossing type pixel interval brightness correction method is characterized in that aiming at all inter-module seams in a display unit, 3 rows of LED pixels separated by N columns at two sides of a vertical edge seam are brightened, and 3 rows of LED pixels separated by N rows at two sides of a horizontal edge seam are brightened; multiplying the brightness enhancement proportion of the brightness enhancement LED pixels by the original correction coefficient to obtain a correction coefficient; correcting the brightness of the LED pixels by using a correction coefficient to finish optical seam repair; the display unit is a display screen, and the pixel spacing of the seam LED and the pixel spacing of the standard LED are obtained by adopting the following method:
step one), aiming at the vertical edge joint between all modules of each display box body in a display screen, lighting single-base-color LED pixels centered in red, green and blue in 3 rows of LED crystal elements separated by N rows at two sides of the vertical edge joint; LED pixels for displaying the serial numbers of the display boxes are lightened in two transverse modules in the center of each display box: the view finding frames of the digital cameras are sequentially aligned with the display boxes to take pictures, so that display box photos are obtained;
Step two), the digital camera is held, and the view finding frames aim at the display boxes to take pictures, so that the pictures of the display boxes are obtained; determining and recording the position of the display box body corresponding to each photo in the display screen according to the number on the photo, and then selling the number; the pin number method is as follows: setting a pin number gray threshold H0', wherein the gray is kept unchanged if the gray value of the LED pixel in the display number area is smaller than the pin number gray threshold H0', and the gray value of the LED pixel is changed to H0 'if the gray value of the LED pixel is larger than or equal to the pin number gray threshold H0';
step three) envelope method: for any display box body, setting the length of a long strip as the width of a camera view field, and setting the width of the long strip as D0 rows of camera pixels; intercepting brightness data of camera pixels in a long strip from a first row, calculating a brightness data average value of the D0 row camera pixels of each column, and forming an envelope by the brightness data average value of the camera pixels of each column in the long strip; if the peak values of all the envelope peaks are smaller than the gray threshold value H0, the strip moves downwards until the peak value > H0 of the envelope peak appears, and 1/2 of the peak value of the highest envelope peak is defined as H1 to replace H0; calculating the distance D1 between adjacent envelope peaks, and replacing D0 with half of the value of D1 to be used as the width of a new long strip;
Step four), moving down the long strip, continuously intercepting the brightness data of the camera pixels in the long strip according to half of the value of the new strip width D1, calculating the average value of the brightness data of each column of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each column of camera pixels in the long strip; calculating the positions of the spot centers of the corresponding three LED pixels according to the average value of the brightness data of each row of camera pixels of the continuous 3 envelope peaks; calculating the pixel spacing of the edge joint LED and the pixel spacing of the standard LED at the edge joint according to the positions of the light spot centers of the three LED pixels; the standard LED pixel spacing and the seam LED pixel spacing at the seam of the vertical edges between every two adjacent modules of the whole display box body are obtained;
step five), the same principle is adopted, and aiming at the transverse edge joint between all modules in the display box body, single-base-color LED pixels centered in red, green and blue in 3 rows of LED crystal elements which are separated by N rows on the upper side and the lower side of the transverse edge joint are lightened; setting the length of a long strip as the height of a camera view field, setting the width of the long strip as D0, and obtaining the standard LED pixel spacing and the seam LED pixel spacing at the seam between the adjacent modules of the display box body according to the method of the second to fourth steps;
and repeating the second to fifth steps to obtain the standard LED pixel spacing and the seam LED pixel spacing at the seam of the transverse edges of all adjacent modules in all display boxes of the display screen.
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