Surface defect detection method and system for reflection curved surface

Abstract

The invention discloses a method and a system for detecting surface defects of a reflection curved surface. The method comprises the following steps: receiving a fringe pattern reflected by the reflection curved surface to generate a plurality of transverse straight line segments and a plurality of longitudinal straight line segments; determining pixel points of a white rectangular area corresponding to the plurality of transverse straight line segments and the plurality of longitudinal straight line segments, and fusing to obtain a test pattern; enabling the projection screen to project the test pattern to the reflection curved surface, and generating a global pattern; and judging whether the reflection curved surface has defects or not according to the global pattern. Detection can be carried out visually and quickly by detecting a latticed global pattern, and the situation that the detection accuracy is reduced due to the fact that a delustering agent is unevenly smeared and the accuracy is reduced due to long-time human eye detection is avoided. Detection precision is improved.

Description

technical field [0001] The invention relates to the field of workpiece detection, in particular to a method and system for detecting surface defects on reflective curved surfaces. Background technique [0002] When the reflective surface on the surface of the workpiece reflects light with the reflection component as the main component and the diffuse reflection component as the supplement, the specular reflection will make the image saturated or too dark, resulting in information distortion, resulting in a significant drop in measurement accuracy and even difficulty in normal measurement. To solve this problem, the easiest way is to coat a layer of matting agent on the surface of strongly reflective objects to make the surface of the object exhibit diffuse reflection characteristics, but the matting agent is often not evenly coated on the surface of the object, which greatly reduces the measurement accuracy. Another method is to directly use manual methods for detection, but...

AI Technical Summary

Problems solved by technology

[0002]When the reflective surface on the surface of the workpiece reflects light, the reflection component is the main component and the diffuse reflection component is supplemented. The specular reflection will make the image saturated or too dark, resulting in information distortion , resulting in a sharp drop in measurement accuracy, and even difficulty in normal measurement

To solve this problem, the easiest way is to coat a layer of matting agent on the surface of the strongly reflective object to make the surface of the object exhibit diffuse reflection characteristics, but the matting agent is often not evenly coated on the surface of the object, which greatly reduces the measurement accuracy

Another method is to directly use manual methods for detection, but workers work hard to observe the reflective surface for a long time, which is easy to cause eye fatigue and eye discomfort, resulting in a large number of false detections

Images