Judgment method for missing plating defects in continuous strip-shaped porous metal materials

A technology of porous metal and judgment method, which is applied in the direction of optical testing for flaws/defects, image analysis, image enhancement, etc. It can solve the problems of incompatibility with continuous production, poor accuracy, and high cost, and achieve high accuracy and improve quality and pass rate, the effect of reducing production costs

Active Publication Date: 2019-01-01
先进储能材料国家工程研究中心有限责任公司
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Problems solved by technology

This method has low efficiency, poor accuracy, high cost, and relies heavily on the experience of the operator, which is not suitable for continuous production

Method used

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  • Judgment method for missing plating defects in continuous strip-shaped porous metal materials
  • Judgment method for missing plating defects in continuous strip-shaped porous metal materials
  • Judgment method for missing plating defects in continuous strip-shaped porous metal materials

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Embodiment 1

[0020] A method for judging missing plating defects of continuous strip-shaped porous metal nickel materials. First, train the classifier according to the following steps:

[0021] (I) Using a Viewors VH-4M HD camera with a resolution of 2448×2056, under the same illumination, a 95PPI, an areal density of 350g / m2, and a thickness of 1.0mm are used to vertically shoot a strip-shaped porous nickel product image. From the captured images Select 900 normal product images and 350 product images containing missing plating defects, select the size of the images to be 1024×1024 pixels, and input all of them into computer equipment;

[0022] (II) In computer equipment, calculate the average gray value, variance, homogeneity value and moment of inertia in the two directions of 45° and 135° for each image, a total of 5 eigenvalues; the homogeneity value is calculated by formula (1) get:

[0023]

[0024] Among them, d means distance, θ means angle, P (d,θ) (m,n) represents the value of each el...

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Abstract

The invention provides a method for determining the defect of plating omission of a continuous strip-shaped porous metal material. The method includes the steps of training a classifier, testing and outputting a result. During training of the classifier, gray level mean values, variances, homogenous values and moments of inertia in two directions of 45 degrees and 135 degrees of images of a normal product and a product with the defect of plating omission are calculated, the abovementioned values of the normal image are used as positive sample characteristic vectors, the abovementioned values of the image of the product with the defect of plating omission are used as negative sample characteristic vectors to be input to an SVM classifier to be trained, after training is completed, a product to be tested is taken to extract a gray level mean value, variance, homogeneous value and moment of inertia in the two directions of 45 degrees and 135 degrees to from test characteristic vectors to be input to the SVM classifier to be detected, and a detection result is output. The method provided by the invention can automatically judge the defect of plating omission of the porous metal material on line, is high in accuracy, and can realize nondestructive automatic detection of the product during production.

Description

Technical field [0001] The invention relates to a method for judging defects of porous metal materials, in particular to a method for judging missing plating defects of continuous strip-shaped porous metal materials. Background technique [0002] Porous metal material is a new type of metal matrix composite material with integrated structure and function composed of a metal matrix and a large number of pores. It has unique advantages due to its low density and large specific surface area, and has been widely used in high-tech fields. However, in the continuous industrial production process, the missing plating defect of the product (that is, the unplated metal) seriously affects the product quality. At present, the general method for judging such defects in materials is to use manual visual inspection under sufficient light conditions. This method has low efficiency, poor accuracy, high cost, and heavily relies on the experience of operating staff, which is not compatible with ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G06T7/00G06T7/45G01N21/95
CPCG01N21/95G06T7/0008G06T2207/30136
Inventor赵于前郭宽钟发平
Owner先进储能材料国家工程研究中心有限责任公司