基于CMOS图像传感器的多斜率积分模式

CMOS图像传感器由于器件本身的特点,相比CCD传感器,其动态范围较小。以CYPRESS公司生产的高性能CMOS图像传感器IBIS5-A-1300为研究对象,对其多斜率积分原理进行研究,提出了采用同步快门多斜率积分的方法来扩展CMOS图像传感器的动态范围。以FPGA+DSP为系统的硬件处理平台,给出了多斜率积分驱动时序的具体设计思路和方法,并在QuartusⅡ7.0环境下对所设计的驱动时序进行功能仿真。采用所设计的多斜率积分时序驱动,将CMOS图像传感器的动态范围由原来单斜率积分模式下的64 dB扩展到了90 dB。实验结果表明,采用多斜率积分模式可以实现动态范围扩展的要求。

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 QuartusⅡ7.0,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.