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全景相机是嫦娥三号重要载荷,与其他载荷共同完成巡视区地形地貌、撞击坑、地质构造等科学目标.其中,月表数字高程模型由全景相机获取,是开展上述科学分析的重要依据,高程模型的建立依赖于全景相机数据的匹配.分析月表形貌和全景相机数据的特点,本文基于置信度传播理论,综合灰度与梯度信息,提出融合灰度与梯度特征的视差能量模型;同时在置信度解算时,依据像素点与邻域梯度进行有效的能量传递,防止视差断裂区域能量的不当传递,保证全局匹配质量.试验选取两组立体像对,分别代表视差断裂区以及高亮区,结果表明本文提出的方法匹配正确率较传统置信度匹配高,从而能保证精度较高的月表DEM构建结果.
Panoramic camera Chang'e III is an important load, and other loads together to complete the patrolling area topography, impact crater, geological structure and other scientific goals.Among them, the moon digital elevation model obtained by the panoramic camera is an important basis for the above scientific analysis, elevation The establishment of the model depends on the matching of panoramic camera data.Analysis of the characteristics of lunar topography and panoramic camera data, this paper proposes a parallax energy model based on the belief propagation theory and the integrated grayscale and gradient information, When the confidence level is calculated, the effective energy transfer is carried out according to the pixel point and the neighborhood gradient to prevent the improper transfer of energy in the region of the parallax fault and ensure the global matching quality. Two sets of stereopair are chosen to represent the parallax fault zone and highlight The results show that the matching accuracy of the proposed method is higher than the traditional confidence matching, which can ensure the accuracy of the lunar surface DEM construction results.