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HDRI系统是指进行高动态范围图像采集的成像系统。在使用空间光调制器进行反馈调制从而获取宽动态范围图像的系统中,由于未知景物光强范围很大,会导致反馈耗时或振荡。提出了一种将控制理论中的PID技术应用于反馈调制系统的调整方法。从PID的原理出发,根据工程应用的具体情况,简化了PID控制器的参数,得到了简单的PID控制器参数。通过数值仿真对PID控制器参数进行了充分的讨论,明确了这一参数的最优取值范围及取值原则。通过成像实验验证了这种PID控制参数的正确性。
HDRI system refers to the imaging system for high dynamic range image acquisition. In systems that use spatial light modulators for feedback modulation to achieve wide dynamic range images, time-consuming or oscillating feedback can occur due to the large range of unknown scene intensities. A method of applying PID technology in control theory to feedback modulation system is proposed. Proceeding from the principle of PID, the parameters of PID controller are simplified and the parameters of PID controller are simplified according to the specific situation of engineering application. PID controller parameters are fully discussed through numerical simulation, and the optimal range of values and principle of value for this parameter are defined. The correctness of this kind of PID control parameters is verified by imaging experiments.