基于PID控制器的HDRI系统的研究

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。

Research of HDRI system based on PID controller

HDRI system means the high dynamic range imaging system.In one kind of HDRI system,space light modula- tor is used to feedback modulate the light.Because of the uncertainty of the light intensity in the scene,the feedback will last too long or become unstable.One adjusting method for the feedback modulation based on the PID theory is introduced.The pa- rameters of PID controller are discussed according to the engineering applications,and very simple PID parameter is obtained. Data simulations are taken to study this parameter,the optimized value range and principle of choice is determined.Imaging ex- periment is carried out to get high dynamic range image,and the result proves that the PID parameter takes good effect.