An Optical Inspection System Development for Defects on Multi-surfaces of Chips Ming-Fu Chen, Chih-Wen Chen, Chih-Chung Chou, Chih-Yen Chen and Yen-Chi Chiu MATEC Web Conf., 68 (2016) 12003 Published online: 01 August 2016 DOI: 10.1051/matecconf/20166812003