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A method for correcting uneven illumination of mahjong images based on feature classification

A technology of uneven illumination and correction method, which is applied in image enhancement, image data processing, instruments, etc., and can solve the problems of long processing time and high space complexity

Active Publication Date: 2018-03-13
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This invention requires transformation and inverse transformation in the time domain and frequency domain, which has high space complexity and consumes a long processing time

Method used

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  • A method for correcting uneven illumination of mahjong images based on feature classification
  • A method for correcting uneven illumination of mahjong images based on feature classification
  • A method for correcting uneven illumination of mahjong images based on feature classification

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Embodiment Construction

[0058] The present invention will be described in detail below in conjunction with the embodiments and accompanying drawings, but the present invention is not limited thereto.

[0059] figure 1 Shown is the design schematic diagram of the mahjong typesetting visual inspection device of the mahjong packing machine. The typesetting mahjong 3 passes along the black conveyor belt from left to right along the direction of the arrow E, and is controlled by the first baffle 4 to stop directly under the camera 1. Next, under the illumination of the light source 2, the camera 1 takes a picture of the mahjong 3 image at this time, typeset the mahjong 3 in the collected image, and use the method for correcting uneven illumination of the mahjong image based on feature classification provided by the present invention to detect, if If the typesetting detection is correct, then the first baffle 4 moves up, and the mahjong 3 continues to pass along the arrow C to the right; In this embodimen...

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Abstract

The invention relates to a method for correcting uneven illumination of mahjong images based on feature classification, which includes the following steps: (1) input the number of mahjong rows and rows of the overall layout mahjong to be detected, and collect a background image; (2) input an image containing the entire mahjong Collect images of typesetting mahjong, and segment them to obtain the overall typesetting mahjong grayscale image; (3) Use the equal spacing method to divide all individual mahjongs from the overall typesetting mahjong; (4) According to the lighting characteristics, perform illumination types on individual mahjongs Classification; (5) Perform mean normalization processing on individual mahjong after classification; (6) Sharpen the overall layout mahjong grayscale image; (7) Use chromaticity information to enhance the overall layout mahjong pattern; (8) Classify The final single mahjong is denoised. According to the illumination characteristics of the mahjong image, the present invention performs targeted illumination correction processing on different types of individual mahjongs, effectively improving the image quality and increasing the mahjong layout recognition rate.

Description

technical field [0001] The invention belongs to the application of digital image processing technology in mahjong typesetting visual detection in the mahjong packaging process, in particular to a method for correcting uneven illumination of mahjong images based on feature classification. Background technique [0002] Mahjong is a game invented in China. It is very popular in urban and rural areas of China. It is one of the largest and most influential cultural and sports activities in China. The number of mahjong produced in China reaches hundreds of millions every year. Mahjong is a small rectangular block made of plastic, with patterns or words engraved on its front side, and each pair of mahjong has 144 mahjong tiles, which are divided into two versions for packaging. Each version of mahjong has 72 mahjong tiles arranged together in a rectangular shape of 8 rows and 9 columns to form a semi-finished mahjong. At present, manual inspection is basically used to check the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T5/70
Inventor 朱威王财盛胡文文杨洋郑雅羽
Owner ZHEJIANG UNIV OF TECH
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