An image processing-based crack detection technique for pressed panel products

•A crack detection system is proposed for fast quality monitoring of pressed panel products on the highly automated production line.•Pre-stored baseline images are not required in the proposed method, which improves the applicability for real manufacturing lines.•Computational cost can be significantly reduced without much loss of the accuracy by performing the two-stage detection.•The performance of the proposed technique is further improved by light control and percolation-based shape recognition.