A new segmentation algorithm for lunar surface terrain based on CCD images

• Published in: Research in astronomy and astrophysics 2015-09, Vol.15 (9), p.1604-1612
• Main Authors: Jiang, Hong-Kun, Tian, Xiao-Lin, Xu, Ao-Ao
• Format: Article
• Language: English
• Subjects: Algorithms; CCD图像; Digital Elevation Models; Highlands; Lunar maria; methods: data analysis; Moon; Surface layer; techniques: image processing; Terrain; Texture; 分割算法; 分类精度; 加权欧氏距离; 数字高程模型; 月球; 美国地质调查局; 表面地形
• ISSN: 1674-4527; 2397-6209
• DOI: 10.1088/1674-4527/15/9/016

Terrain classification is one of the critical steps used in lunar geomorphologic analysis and landing site selection. Most of the published works have focused on a Digital Elevation Model （DEM） to distinguish different regions of lunar terrain. This paper presents an algorithm that can be applied to lunar CCD images by blocking and clustering according to image features, which can accurately distinguish between lunar highland and lunar mare. The new algorithm, compared with the traditional algo- rithm, can improve classification accuracy. The new algorithm incorporates two new features and one Tamura texture feature. The new features are generating an enhanced image histogram and modeling the properties of light reflection, which can represent the geological characteristics based on CCD gray level images. These features are ap- plied to identify texture in order to perform image clustering and segmentation by a weighted Euclidean distance to distinguish between lunar mare and lunar highlands. The new algorithm has been tested on Chang＇e-1 CCD data and the testing result has been compared with geological data published by the U.S. Geological Survey. The result has shown that the algorithm can effectively distinguish the lunar mare from highlands in CCD images. The overall accuracy of the proposed algorithm is satisfactory, and the Kappa coefficient is 0.802, which is higher than the result of combining the DEM with CCD images.