Image processing-based automobile body paint film defect detection and identification method

Abstract

The invention relates to a detection and identification method for automobile body paint film defects, in particular, an image processing-based automobile body paint film defect detection and identification method. The detection and identification method includes the following steps of: step one, image acquisition: a laser emitter is utilized to vertically irradiate the surface of a piece to be tested, so that an image can be obtained; step two, image pre-processing: after the automobile body paint film defect image is acquired, the image is pre-processed; step three, automobile body paint film defect characteristic parameter extraction: the geometrical characteristic, gray characteristic value and horizontal direction main projection characteristic value of an automobile body paint film are selected as defect characteristic parameters; step four, characteristic parameter dimensionality reduction; and step 5, paint film defect judgment based on a support vector machine. According to the detection and identification method of the invention, the quality of the image is improved, so that a large number of defect characteristic parameters can be obtained, and therefore, detection of small paint film defects can be realized, the accuracy of automobile body paint film detection can be improved, the quality of the automobile body paint film can be improved, and automobile production cost can be decreased.

Description

technical field [0001] The invention relates to a detection and recognition method for vehicle body paint film defects, in particular to a detection and recognition method for vehicle body paint film defects based on image processing. Background technique [0002] Car body paint film is an important part of the car surface, which has the following functions: car body paint film can protect the outer surface of the car from corrosion and prolong the service life of the car. With the continuous listing of new materials, the protective effect of car body paint film is becoming more and more Bigger, such as scratch resistance, elasticity, pollution resistance, etc.; since the 1950s, the body paint has been constantly changing from plain paint to metallic paint to pearl paint, which has improved the texture, beauty and dynamics of the car; For the same car model, different types of paint have different prices; the color types of car body paint films reflect the different uses of ...

AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for detecting and identifying vehicle body paint film defects based on image processing, which solves the problem of inaccurate identification of vehicle body paint film defects in the prior art

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