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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 correction method for non-uniform illumination of mahjong images based on figure classification. The correction method comprises the following steps: (1) inputting mahjong row and line numbers of integrally typesetted mahjong blocks to be detected, and acquiring a background image; (2) inputting the acquired image containing the integrally typesetted mahjong blocks, and dividing the acquired image to obtain an integrally typesetted mahjong block grey-scale map; (3) separating all single mahjong blocks from the integrally typesetted mahjong blocks according to an equal interval method; (4) conducting illumination type classification on each mahjong block according to illumination features; (5) conducting mean value normalization processing on each classified mahjong block; (6) sharpening the integrally typesetted mahjong block grey-scale map; (7) enhancing integrally typesetted mahjong block patterns according to chromatic information; and (8) denoising each classified mahjong block. As targeted illumination correction is conducted on the different types of single mahjong blocks according to the illumination features of the mahjong images, the image quality is effectively improved, and the recognition rate of mahjong typesetting is improved.

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
CPCG06T5/002
Inventor 朱威王财盛胡文文杨洋郑雅羽
Owner ZHEJIANG UNIV OF TECH
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