Studies On The High Dynamic Range Imaging Feedback System Based On FPGA

Image information is one of the information technology branches which include the most part of information field. In many important applications, the dynamic range of solid-state imaging sensors is critical. As a result, the extension of dynamic range of solid-state imaging sensors is one of the key methods to extract more information from imaging.This project developed a high dynamic range imaging (HDRI) system based on spatial light modulator and solid-state imaging sensors. The depth of modulation of spatial light modulator is determined by the output of solid-state imaging sensors. Hence, a negative-loop control system is constituted to extend the dynamic range of solid-state sensors. This thesis includes the following parts:(1)Based on summing up and analyzing expansion dynamic range of the existing solid image sensor, the feedback control is analyzed and formulated. The feasibility of direct feedback control is studied with simulation. The range of feedback depth is discovered for the convergence of output images.(2) According to the requirement of HDRI system, FPGA is selected as a main-controller based on comparing with schemes.(3) According to HDRI and FPGA, peripheral circuit is drawn and module is laidout.Chip selecting and circuit designs are accomplished.(4) Function module of HDRI system is debugged elementary .And data acquired,processed and transferred in ping-pong mode based on FPGA is achieved.Experiment indicates that function module of HDRI system meet the demand of HDRI system and forecast resulets are achieve.