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Product appearance detection method and device

A technology for appearance inspection and product application in measuring devices, optical testing for flaws/defects, material analysis through optical means, etc. It can solve problems such as inescapable and achieve the effect of saving carrying space requirements

Inactive Publication Date: 2021-05-11
VOMMA (SHANGHAI) TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a product appearance detection method, aiming to solve the existing predicament that the product appearance detection still cannot get rid of a large number of artificial naked eye judgments

Method used

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  • Product appearance detection method and device
  • Product appearance detection method and device
  • Product appearance detection method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] According to one or more embodiments, such as figure 1 As shown, a product appearance detection method based on a light field camera includes the following steps:

[0020] A1, according to the size of the measurement area and the measurement depth range of the product under test, for example, in this embodiment, the surface scratches on the appearance of the SD card are tested, and an optical lens suitable for the focal length and magnification is selected. Adjust the lens aperture to match the aperture of the light field camera, that is, the aperture of the microlens matches the aperture of the main lens. The specific performance is that the light field camera shoots a defocused soft light pure color calibration plate image, in which the microlens array is just or close to a tangent state. After the adjustment is completed, take several solid color background plates with relatively uniform light intensity at the defocused position of the light field camera, that is, th...

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Abstract

A product appearance detection method comprises the following steps: shooting by at least one light field camera to obtain an appearance image of a detected product; arranging at least one light source to irradiate the to-be-detected area of the appearance of the detected product at a proper angle, so that the to-be-detected area of the appearance of the detected product is well imaged by the light field camera; and carrying out light field multi-view rendering on the appearance image of the detected product, and judging according to the surface texture information of the light field multi-view image to obtain the appearance surface defect information of the detected product; and after the appearance surface defect information of the detected product is obtained, judging the appearance of the product according to a preset judgment standard in combination with the position of the poor texture on the appearance surface of the detected product.

Description

technical field [0001] The invention belongs to the technical field of product inspection, and in particular relates to a product appearance inspection method and device. Background technique [0002] In recent years, with the rapid growth of technology and industrial level, the demand for products in daily life has exploded. Industrial production has gradually entered the stage of semi-automated and automated production, but it involves the appearance inspection of parts and finished products of metal, plastic, ceramics and other materials, which has become a major problem restricting the efficiency of industrial inspection. Sometimes an automated production line requires a large amount of manpower to carry out product testing, which becomes a major factor restricting the stability of the production line. Surface appearance defects such as scratches, indentations, spot damage, oil stains, damage, impurities, etc. may occur on the surface of products made of metal, plastic,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88G01N21/93
CPCG01N21/8806G01N21/93G01N2021/8809G01N2021/8835
Inventor 丁俊飞李浩天
Owner VOMMA (SHANGHAI) TECH CO LTD
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