1. a Department of Electro-Optical Engineering , Southern Taiwan University , No. 1, Nan-Tai Street, Yungkang district, Tainan City , 710 , Taiwan
2. b Medical Devices and Opto-electronics Equipment Department , Metal Industries Research & Development Center , 3F, No. 88, Luke 5th Rd., Lujhu Township, Kaohsiung , 82151 , Taiwan
3. c Department of Electrical Engineering , National University of Tainan , No. 33, Sec. 2, Shu-Lin Street, Tainan , 700 , Taiwan
4. d Department of Electronics Engineering and Computer Sciences , Tung-Fang Design University , No. 110, Tung-Fung Road, Hunei Shiang , Kaohsiung , 829 , Taiwan