针对现代制造业中类镜面物体表面缺陷检测的问题,研究了基于相位测量偏折术的自动检测方法。采用相移结合格雷码编码法提取反射图像相位,通过判断局部相位异常识别缺陷。分析相位提取错误导致误检现象的原因,提出一种折叠相位周期级数校正的方法。该方法能解决相位展开过程中的周期错位问题,保证相位的准确提取,避免误检问题。实验结果表明,基于相位偏折原理的检测方法能够实现对类镜面物体表面缺陷的准确、可靠检测。

To detect defects on mirror-like object surfaces in the modern manufacturing industry, an automatic detection method based on phase measuring deflectormetry is proposed. The phase of the reflected image is extracted by combining the phase shift and Gray code, and defects are identified by an analysis of local phase irregularities. In addition, the phase extraction error that leads to false detection is analyzed. A wrapped phase period index correction algorithm is proposed to prevent period misalignment during the phase unwrapping. Therefore, accurate phase extraction can be assured through the phase unwrapping algorithm, and false detection is avoided. Experimental results indicate that the proposed method can accurately and reliably detect mirror-like surface defects.