Development of Real-Time TCP/COF Inspection System using Differential Image

Abstract In this paper, we proposed a faulty pattern detection algorithm of TCP(Tape Carrier Package)/COF(Chip On Film), and implemented a real-time system for inspecting TCP/COF. Since TCP/COF has very high resolution having several micro meters, the human operator should visually inspect all the parts through microscope. In this work, we implement an in-spection system to detect the faulty pattern, so the operator can visually inspect only the designated parts by the in-spection system through the monitor. The proposed defects detec tion algorithm for TCP/COF packages is implemented by the pattern matching method based on subtracting the reference image from test image. To evaluate performance of the proposal system. we made various experiments according to type of CCD camera and light source as well as illumi-nation projection method. From experimental results, it is conf irmed that the proposed system makes it possible to detect effectively the defective TCP/COF film. Key Word : TCP/COF, Machine vision, Inspection system, differential image