Moire detecting and suppression method and device

A technology of suppressing device and moiré, applied in the field of optical character recognition, can solve the problems of moiré interference and affecting the uniformity and uniformity of brightness and chromaticity of LED display screen.

Active Publication Date: 2015-04-01
XIAN NOVASTAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, moiré interference may occur during the calibration process, which will affect the uniformity of brightness and chromaticity of the LED display.

Method used

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  • Moire detecting and suppression method and device
  • Moire detecting and suppression method and device
  • Moire detecting and suppression method and device

Examples

Experimental program
Comparison scheme
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no. 1 example

[0035] figure 1 It is a flow chart of the moiré detection and suppression method in the first embodiment of the present invention, which is used for the detection and suppression of moiré in the imaging of the image collector when the LED display screen is corrected, such as figure 1 As shown, the method of the present embodiment includes the following steps:

[0036] Step S101 , using an image collector to capture a first image of the LED display screen, and analyzing the grayscale distribution of the first image in the frequency domain.

[0037] The image collector may include an area array camera, which is an imaging tool for image acquisition in units of areas, and can acquire a complete target image at one time. The red, green and blue image analysis of the LED display screen is taken by the area array camera. Further, when the image collector acquires the image of the display area of ​​the LED display screen, it first performs area positioning, that is, the first image...

no. 2 example

[0044] figure 2 It is a flow chart of the moiré detection and suppression method according to the second embodiment of the present invention, as figure 2 As shown, the difference between this embodiment and the first embodiment is that, before step S101, the steps:

[0045] Step S100, using the image collector to take an initial image of the LED display screen, and performing saturation analysis on the initial image to guide and adjust the second parameter of the image collector and / or the LED display screen the third parameter; repeating this step to make the initial image meet the first preset condition.

[0046] That is, before acquiring the first image, use the image acquisition device to obtain the initial image of the LED display screen, perform saturation analysis on the initial image, and guide the adjustment of the second parameter of the image acquisition device and / or the LED display screen according to the analysis results. The third parameter is repeated operati...

no. 3 example

[0048] image 3 It is the flow chart of the method for moiré detection and suppression according to the third embodiment of the present invention, such as image 3 As shown, in the above embodiment, in step S101, analyzing the gray level distribution of the first image in the frequency domain may include the following steps:

[0049] S1011. Transform the discrete distribution of gray values ​​of the first image into the frequency domain to obtain a spectrum image; for example, the discrete distribution of pixel gray values ​​can be transformed into the frequency domain through discrete Fourier transform (DFT). The principle formula of discrete Fourier transform under two-dimensional transformation can be shown as follows:

[0050] F ( u , v ) = Σ x = 0 M - ...

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Abstract

The invention relates to a moire detecting and suppression method and device. The method comprises the steps of (a) shooting a first image of an LED display screen through an image acquiring device, and analyzing the gray level distribution of the first image in a frequency domain; (b) determining a moire existential state of the first image according to the gray level distribution; (c) adjusting the parameters of the image acquiring device and / or the LED display screen according to the moire existential state. According to the method, the image of the LED display screen is acquired and subjected to moire detection, and saturation analysis and imaging area analysis of the image are realized, so as to guide and adjust the parameters of the image acquiring device and the LED display screen to suppress moire generated by shooting of the image acquiring device, so that adverse influences of the moire on subsequent correction can be effectively prevented.

Description

technical field [0001] The invention relates to the field of optical character recognition, in particular to a moiré detection and suppression method and device. Background technique [0002] As a new type of display technology, LED display has gradually been accepted by the market due to its advantages of energy saving, environmental protection, and high brightness, and has been widely used in urban media, urban traffic electronic signage and other fields. The calibration of the LED display has also become a concern, but the existing technology mainly uses high-precision measuring equipment such as area array cameras to perform point-by-point calibration. However, moiré interference may occur during the calibration process, which affects the uniformity of brightness and chromaticity of the LED display. Therefore, the detection and suppression of moiré in the calibration process has become an urgent problem to be solved. Contents of the invention [0003] In view of this...

Claims

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Application Information

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IPC IPC(8): H04N5/217H04N17/00
Inventor 杨城赵星梅
Owner XIAN NOVASTAR TECH
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