数字域TDI CMOS相机调偏流方法  

Drift angle adjusting method for CMOS cameras based on TDI in digital domain

作　　者：陶淑苹[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小卫星技术国家地方联合工程研究中心,吉林长春130033

出　　处：《红外与激光工程》2014年第B12期214-218,共5页Infrared and Laser Engineering

基　　金：吉林省青年科研基金(201201010)

摘　　要：为了解决现有的机械式调偏流的像移补偿方法存在的,需要复杂的调偏流机构所带来的问题,提出一种适用于数字域TDI CMOS遥感相机的图像调偏流方法。该方法基于数字图像,通过配准图像像素在数字域对位累加来调整偏流角的失配量。最后为了验证提出算法的有效性开展了成像实验,结果表明在26.56°偏流角情况下直接成像的图像对比度传函为0.132 8,而应用图像法调偏流后提升为0.444 7,证明图像调偏流方法能明显改善成像效果,可行有效。该方法摆脱调偏流机械结构思路的限制,精度高而又简单易行,无需要任何附加硬件开支,有助于改进目前国内现有的像移补偿体系。To resolve the problem that brought by the complex drift angle adjusting structure in the current image motion compensation method, a new drift angle adjusting method based on image was proposed in this paper, which was suitable for the CMOS remote sensing cameras based on TDI in digital domain. The method was based on digital images, and accumulates the matching image pixel in digital domain to adjusts the image motion mismatch caused by the drift angle. Finally, in order to verify the effectiveness of the proposed algorithm, the imaging experiment was conducted. And the results show that when the drift angle is 26.56 degrees, the of the image gotten directly before using the proposed algorithm is 0.132 8, while the contrast transfer function is increased to 0.444 7 after using the proposed method. So it proves that the drift angle adjusting method based on image can improve imaging results significantly and is feasible and effective. The proposed method gets rid of the limit of the idea of adjusting the drift angle by mechanical structure, and it is of high precision but simple, without the need for any additional hardware expenses, which is helpful to improve the current image motion compensation system.

关 键 词：图像 时间延迟积分 数字域 遥感 

分 类 号：TP386.5[自动化与计算机技术—计算机系统结构]