Defect Detection in Fabric with a Joint Transform Correlation Technique: Theoretical Basis and Simulation

摘要

The theroeticla basis of a technique for real time defect detection in fabrics is presented using a joint transform correlator. This correlation technique si an extension of Fourier transform analysis and is extremely useful for real time pattern recognition. The regular periodic nature of a woven fabric makes it possilbe to use the Fourier transform technique to detect defects. However, classifying various defect types is difficult form the Foruier analytical and experimental results. A solution to this problem is to use a jonit Fourier transform of a reference pattern and the test pattern, and the joint power spectrum is further processed.