Multiple slope integration based on CMOS image sensor

Compared with CCD (Charge Coupled Device), the dynamic range of CMOS image sensor is narrower, which is due to its self-characteristics. With high-performance CMOS image sensor IBIS5-A-1 300 produced by CYPRESS company as the object, a research was made on the theory of its multiple slope integration, and the integration mode was used to extend its dynamic range. The design method of multiple slope integration's timing was advanced with FPGA and DSP as the hardware system. With Quartus II 7.0, the designed driver timing was simulated in function. The new designed multiple slope integration timing drive extended the optical dynamic range of CMOS image sensor, from original model of single slope integration mode 64 dB to 90 dB. The experiment result shows that multiple slope integration mode can achieve the purpose of extending the dynamic range.