DMD结合图像传感器的高动态场景成像探测

微镜阵列DMD空间光调制器结合图像传感器能够解决高动态场景中强弱目标同时探测的问题，获得高动态图像数据，能使光电成像设备动态范围扩展到130 dB以上。为了实现快速的像素级光强控制以及获得高质量的实际场景高动态图像数据，根据实际场景成像其非边缘区域的相邻像素值变化缓慢的特点，提出了一种适合DMD驱动方式的像素级调光算法-自适应空间区域法，它具有较快的收敛速度，最坏的情况下，经过N/I次即可完成调光权值的搜索；在以FPGA为驱动核心的高动态场景成像探测实验系统平台上，对DMD的驱动时序进行了分析研究。并通过此实验平台验证了自适应空间区域法的有效性，该方法能够实现对高动态场景中强弱目标的同时探测，具有很好的光强控制质量，对场景光强局部变化的适应性较强。

High dynamic range imaging detection based on DMD and image sensor

Digital micromirror device(DMD) which is a spatial light modulator, combined with the image sensor, is able to capture the high dynamic range image data and solve the problem of bright and dark target detection. It can extend the optoelectric imaging device's dynamic range to 130 dB or more theoretically. In order to implement the light intensity control at pixel level fast and get the high dynamic image data of the real scene in high quality, a pixel level dimming algorithm, named adaptive spatial area method was proposed. This method based on the slowly change of adjacent pixels in non-edge region, was fast convergence and suitable for driving the DMD. The diming coefficient could be found after N/I times in the worst case. Then a platform, which was controlled by FPGA, was described in the paper, and the timing analysis of the DMD driver was given below. At last, the method was tested on the platform. The results show that the adaptive spatial area method is strong enough to complete the bright and dark target detection in high dynamic range scene. It has high quality in light intensity control and strong adaptability in scenes that have light intensity change of parts.