Abstract:Multi-capture composition is a valid method on extending the dynamic range of CMOS image sensor (CIS). In this paper, multi-capture composition using in real-time control is studied. By acquired the average value of all pixels, the number of saturated pixels and severe underexposure pixels, the control mode, the number of exposure, integrating time of each exposure and composition algorithm is determined in real-time. This method has been implemented in a 640×480 CIS and simulated with FPGA. The simulated result indicates this method can extend the dynamic range effectively.