关键词: 孔壁全景图, 图像展开, 图像拼接, 图像配准, 图像融合

Abstract: Using borehole digital camera technique to obtain the realistic panorama image of the hole wall has become one of the major ways to conduct geological analysis in geological survey. The existing methods of getting panorama image have such shortcomings as high cost of the equipment, unsatisfactory result of image splicing, etc. In this paper, a new method of acquiring the realistic panorama image of hole wall was proposed. By controlling the well depth and projecting the 360-degree cylindrical space of hole wall under the well onto plane, the authors could get the sequence ring images of hole wall, then unfolded the images and preprocessed them through median filtering algorithm, found out the overlapping parts of the image by the difference image matching principle, and blended them using Bezier curves approximation algorithm to achieve a smooth transition between images. Practical application on geological survey shows that the image mosaic technique presented in this paper is simple, flexible, efficient, and can provide ideal result of the panorama images of the hole wall.

Key words: hole wall panorama, image expansion, image mosaic, image registration, image blending