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Weld seam image rapid preprocessing method and system based on dynamic CLAHE

A preprocessing and image technology, applied in image data processing, image enhancement, image analysis, etc., can solve the problems of time-consuming disadvantages and high algorithm complexity, and achieve the effect of dynamic and rapid enhancement of weld image contrast

Active Publication Date: 2021-12-07
SHANGHAI SPACE PRECISION MACHINERY RES INST
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Problems solved by technology

This method greatly improves the problems of noise and inconspicuous details, but due to the need to perform multiple calculations for each pixel, the algorithm complexity is too high and time-consuming is not conducive to real-time image processing in industrial environments

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  • Weld seam image rapid preprocessing method and system based on dynamic CLAHE
  • Weld seam image rapid preprocessing method and system based on dynamic CLAHE
  • Weld seam image rapid preprocessing method and system based on dynamic CLAHE

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Embodiment Construction

[0077] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0078] The present invention provides a fast preprocessing method for weld seam images based on dynamic CLAHE, the specific processing flow is as follows figure 1 shown, including the following steps:

[0079] Step S1: Read the weld seam image I(x, y) with insufficient overall contrast, for example figure 2 As shown, the weld image is evenly divided horizontally and vertically into M×N sub-images and recorded as Q i (x, y), image 3 A schematic diagram of an image divided into 8 sub-images of 4×2 is...

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Abstract

The invention provides a weld seam image rapid preprocessing method and system based on dynamic CLAHE. The method comprises the following steps: carrying out the uniform partitioning of a preprocessed image, drawing a pixel distribution histogram of each small image, according to a preset threshold optimization histogram and a dynamically adjustable enhanced image gray level range, obtaining a pixel transformation function of a corresponding sub-image block, and using a bilinear interpolation method to avoid a discontinuous phenomenon between the sub-image blocks after pixel transformation; and partitioning the preprocessed image according to a calculation method to obtain four corresponding calculation areas, and preprocessing pixel points in batches in different areas by adopting a matrix calculation mode to obtain the contrast-enhanced image. The method and the system have a remarkable effect on dynamic enhancement of the contrast ratio and local detail information of the weld seam image and meets the requirement of image batch preprocessing, the processing process is accelerated by adopting a matrix calculation mode to meet the requirement of engineering real-time application, and effective guarantee is provided for weld seam image defect recognition processing.

Description

technical field [0001] The present invention relates to the technical field of image preprocessing, in particular, to a fast preprocessing method and system for weld images based on dynamic CLAHE, especially a fast processing of image contrast enhancement based on adaptive histogram equalization with limited contrast method. Background technique [0002] X-ray images used to detect defects in welds and castings in the production process often have uneven illumination and poor contrast, which affects the subsequent processing of the image. Passing poor-quality images directly into the neural network can greatly affect the final result, leading to failure of the neural network model. In order to improve this situation, the research on image contrast enhancement algorithms has attracted the attention of many scholars. In recent years, a large number of research results have been produced on image features, image visual effects, image enhancement theory, and automatic implement...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/40G06T5/00G06T7/11
CPCG06T5/40G06T7/11G06T2207/20132G06T5/90Y02P90/30
Inventor 王立群刘骁佳戴铮刘欢危荃王飞周鹏飞
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST