An innovative multifunctional and integrative analog camera system is designed in this paper
which implements zoom control and aperture control with FPGA. The design utilizes an improved gray scale differential algorithm as focusing evaluation function and utilizes a kind of search strategy to control the remove of step-motor
. Lee Je-ho,Nam Byung-deok,Lee Jae-chon, et al.Implementation of passive automatic focusing alorithm for digital still camera [J]. IEEE Trans. on Consumer Electronics, 1995, 41(3):449-454.