光学学报, 2019, 39 (9): 0911001, 网络出版: 2019-09-09   

针对广域像移变化的数字时间延迟积分方法 下载: 990次

Digital Time Delay and Integration Method for Wide-Range Image Motion Variation
作者单位
1 中国科学院长春光学精密机械与物理研究所, 吉林 长春 130033
2 中国科学院大学, 北京 100049
摘要
为解决现有电子式像移补偿在扫描方向上补偿范围有限的问题,提出一种适用于沿扫描方向广域像移大小变化的数字时间延迟积分(TDI)方法。首先基于像移计算结果判断像移大小是否在电子行频可补偿的范围内,当在不可补偿范围时,基于利用图像插值和配准像素对位累加来调整像移失配量的思想,构建任意像移大小的数字TDI算法模型,并对所提算法进行实验验证。实验结果表明:当96级积分的总像移量远小于像元尺寸时,所提算法与逐行累加的传统TDI方法成像结果相当;当96级积分的总像移量大于像元尺寸时,总像移量超出电子式像移可补偿范围,传统TDI方法扫描图像发生严重混叠,成像质量急剧下降,而所提算法获取图像的像移传递函数和互相关性测度均提高0.11,可有效保持成像质量。
Abstract
The compensable range of the existing electronic image motion compensation method is limited in scanning direction. To solve this problem, a digital time delay and integration (TDI) method suitable for wide-range image motion variation in scanning direction is proposed. First, based on the image motion calculation results, whether the image motion is within the range of electron frequency compensability is judged. Then, the image motion mismatch in scanning direction will be adjusted by image interpolation and matched pixel accumulation when it is not within the compensable range. A digital TDI algorithm model suitable for arbitrary image motion is constructed. Finally, the proposed algorithm is verified by experiments. The experimental results show that when the total image motion of 96-stage integration is much smaller than one pixel size, the image quality of the proposed algorithm is similar to that of the traditional TDI method, but when the total image motion of 96-stage integration is larger than one pixel size, which exceeds the compensable range of the electronic method, the image quality of the proposed algorithm is much better than that of the traditional TDI method. The traditional TDI method causes serious aliasing and the image quality drops sharply; however, the proposed algorithm can maintain the image quality effectively. Both the image motion transfer function and the similarity correlation measure can be improved by 0.11 using the proposed algorithm.

陶淑苹, 张续严, 冯钦评, 宋明珠, 吴勇. 针对广域像移变化的数字时间延迟积分方法[J]. 光学学报, 2019, 39(9): 0911001. Shuping Tao, Xuyan Zhang, Qinping Feng, Mingzhu Song, Yong Wu. Digital Time Delay and Integration Method for Wide-Range Image Motion Variation[J]. Acta Optica Sinica, 2019, 39(9): 0911001.

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