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介绍了一种实用的CMOS传感器感光范围测定系统。利用积分球作标准光源,并用逻辑分析仪作数字输出信号的分析统计,测出CMOS传感器光照度接收曲线。在此基础上提出了一种基于可编程接口(FPGA)芯片控制的CMOS传感器自动调光技术。利用FPGA控制CMOS传感器的电子快门,以此来控制其光照度,达到自动调光的目的。由于FPGA是在线可编程器件,具有电路简单,实时性好,适应性强等特点,并能与后期的图像处理有机结合,所以简化了整个系统的设计。
A practical CMOS sensor sensing range measuring system is introduced. The use of integrating sphere as a standard light source, and the use of logic analyzer for digital output signal analysis and statistics, measured CMOS sensor illumination curve. Based on this, a CMOS sensor auto-dimming technology based on programmable logic controller (FPGA) chip is proposed. The use of FPGA control CMOS sensor electronic shutter, in order to control its illumination, to achieve the purpose of automatic dimming. Because FPGA is an on-line programmable device, it has the characteristics of simple circuit, good real-time, strong adaptability and so on, and it can combine with the later image processing, so it simplifies the design of the whole system.