CN111640122B - LED special-shaped display screen facula positioning and dividing method based on connected domain - Google Patents
LED special-shaped display screen facula positioning and dividing method based on connected domain Download PDFInfo
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- CN111640122B CN111640122B CN202010405855.8A CN202010405855A CN111640122B CN 111640122 B CN111640122 B CN 111640122B CN 202010405855 A CN202010405855 A CN 202010405855A CN 111640122 B CN111640122 B CN 111640122B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/11—Region-based segmentation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/136—Segmentation; Edge detection involving thresholding
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/187—Segmentation; Edge detection involving region growing; involving region merging; involving connected component labelling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention relates to a light spot positioning and dividing method of an LED special-shaped screen based on a connected domain. The method solves the problem of inaccurate positioning and segmentation caused by irregular shapes of the display screen, is applicable to display screens with any shapes, and has strong engineering application value.
Description
Technical Field
The invention relates to the technical field of LED correction, in particular to a method for positioning and dividing light spots of an LED special-shaped display screen based on a connected domain.
Background
Along with the continuous development of LED display technology, LED display screens are developed towards diversification, and the demands of people on special-shaped screens are increasing. Since the LED light emission luminance has a discrete shape, a correction technique must be applied to the LED to ensure display uniformity of the LED, so that the luminance of each display pixel is uniform after the acquisition correction technique is applied. The core of the acquisition correction technology is how to locate and divide the light spots acquired by the LED display screen to obtain independent light spots, so that the accurate extraction of light spot data is realized. However, the light emitting chips of the special-shaped screen are irregularly arranged, and are variously arranged according to the shapes of the display screen, so that great difficulty is brought to the positioning and segmentation of light spots.
In order to solve the problems, the conventional light spot positioning method only aims at a display screen with regular luminous chip arrangement and a special-shaped screen with low arrangement irregularity degree, has the capability of successfully positioning and dividing once, and the special-shaped screen with high luminous chip arrangement irregularity degree only can divide the display screen into a plurality of areas with low arrangement irregularity degree to perform regional light spot positioning and dividing, so that the production efficiency is seriously influenced, and meanwhile, the problem of multi-region splicing incompatibility is generated. Therefore, how to realize accurate one-time positioning and segmentation of light spots in the acquisition and correction process of a display screen with complicated shape and high irregular arrangement degree of the light emitting chips becomes a difficult problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a light spot positioning and dividing method for an LED special-shaped display screen based on a connected domain, which can accurately and quickly position and divide luminous pixels of the special-shaped display screen.
In order to solve the technical problems, the LED special-shaped display screen facula positioning and dividing method based on the connected domain is realized by the following steps:
step one,
The method comprises the steps of collecting a special-shaped display screen formed by M light-emitting chips point by point to obtain a light-emitting chip distribution diagram A, wherein M independent light spots are arranged in the distribution diagram A; setting the size of a distribution diagram A as m multiplied by n pixels, and performing binarization processing on all pixels in the distribution diagram A to obtain a binarized image A1;
step two,
Let only two pixels with gray value of 0 and L in the binarized image A1 be defined as pixel point T1 (i,j) All pixels in the binarized image A1 are scanned point by point, and a pixel point T1 is judged (i,j) If there is a pixel point with the same gray value of L in the 8 neighborhood range, if there is, the two pixel points are considered to be communicated and marked as S k (T1 (i,j) ，T1 (i±δ,j±η) ) Where k=1, 2, 3..n, δ e [0, 1.)]，η∈[0，1]N is the total number of pixel points with the gray value of L;
order the
Judging every two S k Whether or not there is a common pixel point, and S will be the common pixel point k As a group, marked as a connected domain L p Wherein p is the set of labels; finally, the value of p is recorded, and p independent connected domains are determined; the p independent connected domains represent p independent light spots, corresponding to each light emitting chip, i.e., p=m;
step three,
The intermediate pixel coordinates (x i-p ,y j-p ) And the middle pixel coordinates are used as a positioning center and a segmentation center of the corresponding light spots, so that the light spots of the special-shaped screen are positioned and segmented.
In the first step, all pixels in a distribution diagram A are brought into a formula (1) to be subjected to binarization processing, so as to obtain a binarized image formed by pixels with gray values of 0 and L, and the binarized image is marked as A1;
wherein T is (i,j) The gray value of the (i, j) th pixel in the distribution diagram A, delta is a binarization threshold value, and the range is 1.9-20% L max Between them; l (L) max Is the highest gray level of the special-shaped display screen pixel.
In the binarized image A1, the gray value l=l max 。
L may also be 1/2L max ～L max A gray value in between.
According to the mathematical characteristics of the connected domain, the method and the device realize accurate and rapid positioning and segmentation of the luminous pixels of the special-shaped screen, and have high engineering application value.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description.
FIG. 1 is a light spot distribution diagram of a special-shaped display screen;
FIG. 2 is a binarized gray scale map;
FIG. 3 is a connected domain effect diagram;
fig. 4 is a flow chart of a method for positioning and dividing light spots of an LED special-shaped screen based on connected domains.
Detailed Description
The present invention will be described in detail below using the approximately trapezoidal polygonal display screen shown in fig. 1 as an example.
As shown in fig. 4, the method for positioning and dividing the light spots of the LED special-shaped screen based on the connected domain is specifically realized through the following steps:
step one, setting 2269 luminous chips on a special-shaped display screen; acquiring pixel points of the special-shaped display screen one by using a camera to obtain a luminous chip distribution diagram A; each light emitting chip was a complete independent spot in profile a, for a total of 2269 independent spots. The size of the distribution map A is 2748×3840 pixels;
as shown in fig. 2, the gray values of all pixels in the distribution diagram a of the light-emitting chip of the special-shaped display screen are brought into a formula (1) for binarization processing; assume that the highest gray level L of special-shaped display screen max The binarization threshold delta may be set between 5 and 50 for 255. Here, since the gray level of the peak of the light spot is between 120 and 200 at the time of camera acquisition, the gray threshold δ=10 may be set, and finally, the binarized image A1 is obtained.
Step two, as shown in fig. 3, all pixels in the binarized image A1 are scanned point by point, and a pixel with a gray level L of 255 in the binarized image A1 is defined as a pixel point T1 (i,j) Determining the pixel point T1 (i,j) If there is a pixel point with the gray value of 255 in the 8 neighborhood range, if there is, the two points are considered to be connected, and the pixel point is marked as S k (T1 (i,j) ，T1 (i±δ,j±η) ) Where k=1, 2, 3..n, δ e [0, 1.)]，η∈[0，1]N is the total number of pixels with a gray value of 255; as shown in formula (2):
then one by one all S k Bringing into the equation (3) to judge every two S k Whether or not there is a common pixel point, S will be the common pixel point k As a group, denoted as L p Wherein p is the set of labels. And finally, recording the value of p, and determining p independent connected domains.
L p ＝(S k+γ ，S k+ρ )S k+γ ∩S k+ρ ≠0 (3)
Wherein gamma and rho are any numerical values from 0 to N. S with all common pixels k Form an independent communicating region L p S without common pixels k Belongs to two different connected domains, and finally obtains p independent connected domains L p P=2269. Each L p Representing an independent spot.
Step three, as shown in FIG. 4, each connected domain L p The coordinate range of (2) is added to the formula (4) to find each connected domain L p Intermediate pixel coordinates (x) m-p ,y m-p )；
With (x) m-p ,y m-p ) And as a positioning center and a segmentation center of the light spots, the light spot positioning and segmentation of the special-shaped display screen are realized.
Claims (3)
1. The LED special-shaped display screen light spot positioning and dividing method based on the connected domain is characterized by comprising the following steps of:
step one,
The method comprises the steps of collecting a special-shaped display screen formed by M light-emitting chips point by point to obtain a light-emitting chip distribution diagram A, wherein M independent light spots are arranged in the distribution diagram A; setting the size of a distribution diagram A as m multiplied by n pixels, and performing binarization processing on all pixels in the distribution diagram A to obtain a binarized image A1;
step two,
Let only two pixels with gray values of 0 and L in the binarized image A1,the pixel with the gray value L is defined as a pixel point T1 (i,j) All pixels in the binarized image A1 are scanned point by point, and a pixel point T1 is judged (i,j) If there is a pixel point with the same gray value of L in the 8 neighborhood range, if there is, the two pixel points are considered to be communicated and marked as S k (T1 (i,j) ，T1 (i±δ,j±η) ) Where k=1, 2, 3..n, δ e [0, 1.)]，η∈[0，1]N is the total number of pixel points with the gray value of L;
order the
Judging every two S k Whether or not there is a common pixel point, and S will be the common pixel point k As a group, marked as a connected domain L p Wherein p is the set of labels; finally, the value of p is recorded, and p independent connected domains are determined; the p independent connected domains represent p independent light spots, corresponding to each light emitting chip, i.e., p=m;
step three,
The intermediate pixel coordinates (x i-p ,y j-p ) The middle pixel coordinates are used as a positioning center and a segmentation center of the corresponding light spots, so that the light spots of the special-shaped screen are positioned and segmented;
in the first step, all pixels in a distribution diagram A are brought into a formula (1) to be subjected to binarization processing, so as to obtain a binarized image formed by pixels with gray values of 0 and L, and the binarized image is marked as A1;
wherein T is (i,j) The gray value of the (i, j) th pixel in the distribution diagram A, delta is a binarization threshold value, and the range is 1.9-20% L max Between them; l (L) max Is the highest gray level of the special-shaped display screen pixel.
2. The LED special-shaped display screen facula positioning and dividing method based on the connected domain according to claim 1,characterized in that in the binarized image A1, the gradation value l=l max 。
3. The connected domain-based LED special-shaped display screen light spot positioning and dividing method as set forth in claim 1, wherein L is 1/2L max ～L max A gray value in between.
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