2021 Volume 9 Issue 1 Pages 2-11
Embossed surfaces are widely used in many electronic products to enhance the appearance and user experience. However, there are inevitably some defects in the production process. They are difficult to detect by traditional detection algorithms because of the irregular textures on the surface, which are easily affected by illumination conditions. To achieve robust defect detection for logotype printed on the embossed surface, we proposed a novel defect detection method called multiple paired pixel consistency (MPPC). Firstly, we propose a consistency measure for high consistency pixel pairs to realize a robust defect-free model. Secondly, based on this model, we design a measure for judging defective pixel or defect-free pixel. Experimental results with some real-world defective images demonstrate that our approach can achieve state-of-the-art accuracy in real industrial applications.
