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Nickel foam surface defect image segmentation method

An image segmentation, surface image technology, applied in the field of detection

Inactive Publication Date: 2018-08-17
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is the image segmentation method for the detection of foamed nickel surface defects, in order to solve the problems in the existing production process, quickly locate the defects on the foamed nickel, separate the defects from the background, and provide automatic detection of foamed nickel surface defects. Testing lays the groundwork

Method used

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  • Nickel foam surface defect image segmentation method
  • Nickel foam surface defect image segmentation method
  • Nickel foam surface defect image segmentation method

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Embodiment Construction

[0011] Taking nickel foam with nickel skin defects on the surface as the detection object, the surface image of nickel foam is obtained. The image resolution is 1080×720, which can meet the detection requirements. Combined with figure 1 The specific steps of the method are as follows:

[0012] Step 1: Acquire the surface image of nickel foam, and preprocess the surface image with directional filtering, combined with figure 2 , the preprocessing process is as follows:

[0013] 1) The surface image I(i,j) of the obtained nickel foam, such as image 3 As shown in (a), the surface defect of the visible image is fused with the background, and it is difficult to directly extract the defect. Two-dimensional discrete cosine transform (DCT) is performed on the image:

[0014]

[0015] In the formula,

[0016]

[0017] Convert the image from the spatial domain to the frequency domain, and the image is divided into low-frequency regions and high-frequency regions;

[0018] 2) ...

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Abstract

The invention provides a nickel foam surface defect image segmentation method. The nickel foam surface defect image segmentation method includes the steps: acquiring a nickel foam image, performing directional filtering preprocessing on the obtained image to obtain a new image; and performing image segmentation on the new image by means of a PCNN segmentation algorithm to obtain a nickel foam surface defect area. The nickel foam surface defect image segmentation method has preferable segmentation effect, and can realize effective separation between the nickel foam surface defect and the background.

Description

technical field [0001] The disclosed embodiments of the present invention relate to detection technology, and more specifically, to a detection method for surface defects of nickel foam. Background technique [0002] Nickel foam is a new type of functional material obtained through a series of physical and chemical processes on nickel metal. As the base material for automotive batteries, nickel foam has a great impact on battery performance. The surface of nickel foam is silver-gray, with metallic luster, and its shape is similar to a metal sponge. The quality requires smooth surface, no scratches, no cracks, no damage, no oil stains and no oxidation. However, during the preparation of nickel foam, due to factors such as raw materials and processing techniques (PVD, electroplating, sintering, etc.), pollution, indentation, creases, nickel skin, cracks, scratches, and missing plating on the surface of nickel foam will occur. Many different types of defects that seriously aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/194G06T5/00
CPCG06T7/194G06T2207/20052G06T2207/20032G06T2207/30136G06T5/70
Inventor 朱江曾艳李建奇许海霞裴廷睿田淑娟印峰邓清勇钱子君王舒玉
Owner XIANGTAN UNIV
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