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Method for collecting and calibrating multiple cameras of LED (Light-Emitting Diode) display screen

A technology of LED display and correction method, applied in static indicators, instruments, etc., can solve the problems of unsatisfactory correction effect, reduced uniformity, and influence of viewing angle of large-area flat screen and curved screen.

Active Publication Date: 2013-06-12
CHANGCHUN CEDAR ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this is simple and quick, the correction effect will be very unsatisfactory for large-area flat screens and curved screens
This is because when collecting the brightness parameters of the above-mentioned types of display screens, the normal direction of the collection device and the normal light emitting direction of the LED die deviate greatly, which will cause the best viewing effect only at the collection position after correction, and the uniformity will be worse when it deviates from the collection position. Greatly reduced, seriously affecting the viewing angle

Method used

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  • Method for collecting and calibrating multiple cameras of LED (Light-Emitting Diode) display screen
  • Method for collecting and calibrating multiple cameras of LED (Light-Emitting Diode) display screen
  • Method for collecting and calibrating multiple cameras of LED (Light-Emitting Diode) display screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Curved screen seven-camera collection

[0042] Due to the curved part of the curved screen, if the traditional single-camera acquisition method is used, the normal angle of the die and the acquisition angle of the acquisition device will deviate greatly. The positional uniformity is severely degraded, which reduces the viewing angle. Therefore, for curved screens, the effect of using multi-camera acquisition will be more ideal. combine image 3 , the specific implementation process of outdoor curved screen collection is as follows: the curved screen is divided into curved part 2 and flat part 1. If the area of ​​curved part 2 is large and the area of ​​flat part 1 is small, the area of ​​curved part 2 and flat part 1 can be different Acquisition method processing: (1) Flat screen 1 can use a single-camera acquisition method

[0043] At this time, the angle between the position of the acquisition device and the normal direction of the light emitted by the LED die is n...

Embodiment 2

[0047] Curved screen 13-camera collection

[0048] The curved screen is divided into a curved part 2 and a flat part 1. If the curved part 2 and the flat screen part 1 are both large, the angle between the position of the acquisition device and the normal direction of the light emitted by the LED die cannot be ignored. combine Figure 4 , the specific implementation process of outdoor curved screen collection is as follows:

[0049] (1) Part 1 of the flat screen uses the method of five-camera acquisition

[0050] Camera positions 1-5, and camera positions 9-13 are used to collect the light intensity values ​​of the pixels in the plane part of the curved screen. In this way, each LED pixel has a light intensity sequence (LR 1 -LR 5 , LG 1 -LG 5 , LB 1 -LB 5 ). Knowing the light intensity test sequence value, according to the least squares curve fitting formula, fit the red, green, blue light intensity distribution quadratic polynomial of each pixel point, and calculate...

Embodiment 3

[0056] Horizontal large viewing angle flat screen multi-point acquisition

[0057] Such as figure 1 As shown, it is an outdoor horizontal large viewing angle flat screen (here, the horizontal large viewing angle flat screen is defined as when the ratio of the screen width to the collection distance is greater than 1, that is, ). If the single-camera acquisition method is used, the acquisition device is placed at the No. 4 acquisition unit, and the angle between the normal light-emitting direction on the left and right sides of the screen and the acquisition device is too large. If the data is collected at the No. 4 acquisition unit for correction, The uniform correction effect can only be obtained at the No. 4 collection machine position. When the position deviates from the No. 4 collection machine position to the left or right, the correction effect will be significantly reduced. If multi-camera acquisition is used, the normal direction of each point is corrected, so that ...

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Abstract

The invention relates to a method for collecting and calibrating multiple cameras of an LED (Light-Emitting Diode) display screen. The method comprises the following steps of: respectively collecting the tricolor light intensity values of each pixel point on the display screen at N collection cameras by utilizing collection equipment; respectively fitting tricolor light intensity value distribution quadratic polynomials according to test data sequences of the tricolor light intensity values of the pixel point by utilizing a least square curve fitting method; solving out the maximum value of each quadratic polynomial, namely the tricolor normal light intensity data of the pixel point; obtaining a correction coefficient matrix of any pixel point by utilizing the object brightness of the display screen and the normal light intensity data of each pixel point; loading the correction coefficient matrix of each pixel point by virtue of a display screen control system, and performing differentiation control on the pixel points of an LED, namely achieving an effect that the brightness of the full screen is consistent. By utilizing the method, seen from different viewing angles, the uniformity of the full screen is consistent, and the visual angle of the display screen is enlarged.

Description

technical field [0001] The invention relates to a method for collecting and correcting parameters of an LED display screen, in particular to a method for collecting and correcting parameters of a multi-camera LED display screen. Background technique [0002] Due to the discreteness of the LED light-emitting diode itself and the difference in the manufacturing process of the LED display screen, the unevenness of the display screen will be caused. In order to make up for this defect, a correction technology has emerged. Through brightness and chromaticity correction methods, the full-screen brightness and chromaticity consistency of the LED display can be improved, and better image quality performance can be obtained. The premise of the correction is to accurately obtain the light intensity value of each LED luminous pixel in the full screen, which is completed through the acquisition process. At present, when most outdoor LED displays are correcting the entire screen, the ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/00G09G3/32
Inventor 丁铁夫苗静陈宇刘双双
Owner CHANGCHUN CEDAR ELECTRONICS TECH CO LTD
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