Hayabusa2上ONC-T拍摄的多波段图像配准
Image registration for multi-band images taken by ONC-T onboard Hayabusa2
摘要：
Hayabusa 2是日本对C型小行星的样本返回任务，于2018年6月抵达其目标162173 Ryugu。光学导航相机（ONC-T，ONC-W1，ONC-W2）成功获得了大量Ryugu的图像。ONC-T是一种带有电荷耦合器件（CCD）的望远镜分幅相机，在紫外线、可见光和近红外波长范围内有七个滤光带，用于绘制Ryugu表面的光谱分布。由于在滤波器改变序列期间航天器位置和姿态的变化，在ONC-T图像中看到的目标的位置在一个多波段观测序列中的不同波长图像之间略有不同，因此图像处理问题之一是用于不同波长波段的图像之间的图像配准。为了快速完成图像配准，以满足有限的任务时间表，我们结合了传统的图像配准技术与几个改进的基础上以前的行星任务。我们使用实际ONC-T图像的分析结果表明，图像配准可以达到0.1像素的精度，这对于Ryugu分析的许多光谱映射应用来说是足够的。
英文摘要：
Hayabusa2, a Japanese sample-return mission to a C-type asteroid, arrived at its target 162173 Ryugu in June 2018. The optical navigation cameras (ONC-T, ONC-W1, ONC-W2) successfully obtained numerous images of Ryugu. ONC-T is a telescopic framing camera with a charge-coupled device (CCD), has seven filter bands in ultraviolet, visible and near infrared wavelength ranges, and were used to map the spectral distribution of the Ryugu surface. Since the locations of a target seen in ONC-T images are slightly different among different wavelength images in one multi-band observation sequence due to changes in spacecraft positions and attitudes during the filter-changing sequence, one of the image processing issues is image co-registration among images for different wavelength bands. To quickly complete the image co-registration to meet a limited mission schedule, we combined conventional image co-registration techniques with several improvements based on previous planetary missions. The results of our analysis using actual ONC-T images indicate that image co-registration can reach accuracy on the order of 0.1 pixels, which is sufficient for many spectral mapping applications for Ryugu analyses.
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