相向运动条件下图像的辐射状退化及其复原研究

Simulation and Restoration Study on Radiant Degradation Image Under Lengthwise Relative Motion

当摄像机随载体作高速运动时,由于成像曝光时间、摄像机与目标间的纵向相对运动等因素使目标图像产生从中心到边缘的辐射状模糊,使系统有效视场减少,影响对目标的探测、识别和跟踪.本文根据运动成像关系和光电探测器的信号积分机理,研究了摄像平台高速运动条件下,图像辐射状模糊的图像退化模型,对几种特殊图像的退化进行了分析;并针对实际离散成像过程,建立了图像退化模型,分析了影响辐射状退化的因素;提出了一种辐射状模糊图像的递推复原处理算法;计算机方法模拟的辐射状退化图像与实际图像一致,复原算法可有效地减轻相向运动所造成的图像辐射状模糊.

When the camera moves at high speed with its carrier, the target image will degrade with radiant blurring from the center to the periphery of image due to such factors as image exposure time,lengthwise relative motion between camera and target,and others. This will reduce the effective field of .vision,and affect target detection,recognition and follow-up.An image degradation model has been established and the factors affecting radiant image blurring are analyzed on the basis of motion imaging relations,signal integration mechanism of photo-electronic detectors,investigation on consecutive image degradation models of radiant blurring under high speed lengthwise relative motion of camera platform, analysis of degradation of some specific images, and further analysis of the actual dispersion imaging processes. The restoration approach of radiant blurred image based on recursive algorithm is proposed. The radiant degraded image simulated by computerized method is consistent with the actual image, and the restoration algorthm is verfied through the microcomputer,and experimental results show that the proposed algorithm can mitigate radiant blur of high-speed lengthwise relative movement effectively.