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Image processing based X ray welding line zone extracting method

A region extraction and image processing technology, applied in image data processing, image enhancement, image analysis and other directions, can solve the problems of inaccurate mathematical expression, difficult to use effectively, difficult to express, etc.

Active Publication Date: 2015-12-16
四川无为有科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For these methods, since the mathematical expression of weld edge knowledge is usually imprecise or difficult to express, it is difficult to effectively use

Method used

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  • Image processing based X ray welding line zone extracting method
  • Image processing based X ray welding line zone extracting method
  • Image processing based X ray welding line zone extracting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0078] Embodiment, comprises the steps:

[0079] Step A: image preprocessing;

[0080] Step A1: image denoising;

[0081] Since the weld seam image contains a lot of noise and the signal-to-noise ratio is low, this embodiment adopts a Gaussian filter with a size of 5*5, which can effectively filter out small noises without causing too much blur to the edges.

[0082] Step A2: grayscale enhancement;

[0083] The initial grayscale data of the X-ray weld image is 16 bits, and it is concentrated in a very small low grayscale interval, so this interval is first transformed into an 8-bit grayscale interval. The transformation formula is as follows:

[0084] G ′ ( x , y ) = G ( x , y ) - min ...

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Abstract

The invention discloses an image processing based X ray welding line zone extracting method and relates to the field of industrial automatic detection. The method includes a step A of image pretreatment; a step B of edge detection based on least squares line fitting; a step C of scale product calculation. The invention has beneficial effects that noise interference can be suppressed prominently and edge detection accuracy can be improved. Therefore, good accuracy and robustness can be achieved in application in X ray images with a large amount of noises, low comparison degree, blur welding line zone edges and high grey degree distribution overlapping of the welding line zone and the background.

Description

technical field [0001] The invention relates to the field of industrial automatic detection, in particular to an image processing-based X-ray weld area extraction method. Background technique [0002] With the development of image processing technology, there are more and more research results in automatic detection of X-ray weld defects, and its application is becoming more and more extensive. In the automatic detection system of X-ray weld defects, the extraction of weld region is the basis of weld defect detection and recognition, which affects the correctness of defect detection and recognition. However, due to the influence of objective factors such as X-ray imaging methods and steel materials, the image has many problems such as high noise, low contrast, blurred edges of the weld area, and a lot of overlap between the gray distribution of the weld area and the background. There are certain difficulties in the extraction of the seam area, and the current X-ray weld are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/00B23K37/00
Inventor 彭小琼
Owner 四川无为有科技有限公司
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