应用双排TDI CCD提高空间推扫遥感相机动态范围

薛旭成; 韩诚山; 薛栋林; 郭永飞

doi:doi:10.3788/ope.20122012.2791

光学精密工程, 2012, 20 (12): 2791, 网络出版: 2013-01-07

应用双排TDI CCD提高空间推扫遥感相机动态范围

Increasing dynamic range of space push-broom remote sensing camera by two-row TDI CCD

论文大纲

薛旭成 ^*韩诚山薛栋林郭永飞

作者单位

中国科学院长春光学精密机械与物理研究所, 吉林长春 130033

双排时间延迟积分CCD(TDI CCD) 遥感相机动态范围图像合成 two-row Time Delay Integration(TDI) CCD remote sensing camera dynamic range image synthesis

摘要

考虑空间相机观测场景的动态范围很大, 本文提出了采用双排时间延迟积分(TDI) CCD来提高相机动态范围的方案。对两排TDI CCD分别设置不同的积分级数。得到的积分级数高的CCD图像虽然可能存在饱和区域, 但暗区域极易分辨; 积分级数低的CCD图像虽然不利于暗区域的分辨, 但可以较好地观测亮区域的层次。最后, 根据积分级数的差别对两排CCD的图像数据进行合成来获得大动态范围图像。结果显示, 该方案有效地提高了相机的动态范围, 当积分级数分别设置为8和48时, 动态范围可以提高15.56 dB。

Abstract

To adapt a space remote sensing camera to its large dynamic scene, a scheme with two-row Time Delay Integration(TDI) CCDs was proposed to increase the dynamic range of the camera. The two-row TDI CCDs were set separately different integration stages. The obtained image with a high integration stage CCD might contain a saturation region, however its dark region could be distinguished much better.The image with a low integration stage CCD could not be distinguished better, but the gray level of bright region could be recognized easyly. Finally, the images were synthesized according to the difference of integration stages for the two-row CCDs to gain a large dynamic range image. This scheme increases the dynamic range of the camera effectively. When the integration stages of the two row CCDs are set as 8 and 48, respectively,the dynamic range can increase by 15.56 dB.

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薛旭成, 韩诚山, 薛栋林, 郭永飞. 应用双排TDI CCD提高空间推扫遥感相机动态范围[J]. 光学精密工程, 2012, 20(12): 2791. XUE Xu-cheng, HAN Cheng-shan, XUE Dong-lin, GUO Yong-fei. Increasing dynamic range of space push-broom remote sensing camera by two-row TDI CCD[J]. Optics and Precision Engineering, 2012, 20(12): 2791.

应用双排TDI CCD提高空间推扫遥感相机动态范围

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