基于功率谱的遥感相机自动调焦算法研究与实现  

Study and Realization of Automatic Focusing Algorithm for Remote-Sensing Camera Based on Power Spectrum

作　　者：王昕[1] 王海霞[1] 徐抒岩[1] 王永成[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所

出　　处：《电子器件》2007年第3期980-983,987,共5页Chinese Journal of Electron Devices

基　　金：长春光学精密机械与物理研究所青年创新基金资助(Q05A02Z)

摘　　要：应用图像处理法针对线阵CCD推扫成像的遥感相机进行自动调焦研究.推扫成像的线阵CCD相机在任意时刻所拍摄的景物都是不同的,这就给对焦评价函数的选取增加了难度.用功率谱的方法对任意景物在空间频域进行分析表明,功率谱对于自然景物具有一定的不变性.由此建立了基于功率谱的对焦评价函数,并采用DSP+FPGA的高速硬件系统方案实现自动调焦的算法.一系列的调焦实验表明,系统有较好的自动调焦性能,基于功率谱的对焦评价函数是可行的.Digital image processing is applied to the autofocus of linear scan CCD remote-sensing camera with push broom. As for the camera working in linear CCD sweep imaging mode, the scenes shot are different at any time. This brings about difficulty to the selection of the focus measure. In this paper, when different scenes are analyzed in the power spectrum spatial frequency domain, it shows the invariance of power spectrum for natural scenes. The focus measure based on power spectrum is founded and realized by high speed DSP and FPGA. A series of focus experiments show the system has good automatic focusing behavior and the proposed focus measure is of feasibility.

关 键 词：线阵CCD 功率谱 对焦评价函数 自动调焦 

分 类 号：V445.8[航空宇航科学与技术—飞行器设计]