论文标题
火星上下文相机图像的经验光度控制
Empirical Photometric Control of Mars Context Camera Images
论文作者
论文摘要
火星侦察轨道（MRO）航天器自2006年3月以来一直在火星周围的轨道上。MRO上的上下文摄像头（CTX）以每个像素约5-6米返回了地球上100,000张图像，几乎提供了全球覆盖范围。在此期间，火星已经经历了近7年的时间，由于其轨道偏心率，太阳能距离从1.38变为1.67 au，相应的太阳通量增加了45％。季节作用和瞬时现象会影响大气透明度。结合老化的检测器，CTX图像很难无缝地镶嵌，因为所有这些变化都阻止了均衡图像以创建视觉上光滑的产品。我们已经根据其他研究人员对其他数据集的先前工作开发了一种方法，以减轻图像之间几乎所有的光度变化，以创建一个均匀照明的，实际上无缝的马赛克的外观。我们描述了该过程的工作原理，该过程使用参考源将亮度值绑定，并在火星表面展示其效果。虽然为该产品开发的工作流程适用于其他行星体，但它需要一个参考来源，这可能尚不存在。
The Mars Reconnaissance Orbiter (MRO) spacecraft has been in orbit around Mars since March 2006. The Context Camera (CTX) on MRO has returned over 100,000 images of the planet at approximately 5-6 meters per pixel, providing nearly global coverage. During that time, Mars has gone through nearly 7 of its own years, changing solar distance from 1.38 to 1.67 AU and the corresponding solar flux by 45% due to its orbital eccentricity. Seasonal effects and transient phenomena affect atmospheric transparency. Combined with an aging detector, CTX images are difficult to mosaic seamlessly, for all of these changes prevent equalizing images to create a visually smoothly illuminated product. We have developed a method, based on previous work by other researchers for other datasets, to mitigate almost all photometric variations between images in order to create the appearance of an evenly illuminated, practically seamless mosaic. We describe how the process works, which uses a reference source to tie brightness values, and demonstrate its effects across Mars' surface. While the workflow developed for this product is applicable to other planetary bodies, it requires a reference source, which may not yet exist.
