非常規(guī)攝影條件下立體像對的同名點匹配方法研究
[Abstract]:Image matching is a basic problem in image processing, which is to match two images with overlapped parts obtained from different angles of view, different sensors and different time. Image matching methods can be divided into two categories: one is gray-based image matching method, the other is feature-based image matching method. This paper summarizes and introduces the research achievements and current situation of previous researches in image matching, introduces the flow of image matching in detail, and proposes a maximum likelihood estimation (MLESAC) algorithm for matching stereo pairs with the same name under unconventional photography conditions. Under the condition of studying what is unconventional photography, this paper introduces the photography along the main optical axis, as well as the photography with large rotation angle, in which case the photography is unconventional. This paper introduces in detail the imaging model of the stereo image pair along the main optical axis and the imaging model of the stereo image pair in the conventional photography. The parallax of the photography along the main optical axis can be seen from the picture. Nuclear alignment and other problems are quite different from conventional photogrammetry. When studying the feature-based image matching method, this paper proposes an algorithm based on SIFT (Scale-Invariant feature Transformation) and adds the maximum likelihood estimation (MLESAC) algorithm to match the points of the same name of stereo image pair under the condition of unconventional photography. The feature points are extracted by SIFT. Then the maximum likelihood estimation algorithm (MLESAC) based on the likelihood function is used to remove the mismatched feature pairs to realize the accurate image matching. A random sampling consistency algorithm (RANSAC) is used to deal with the feature pairs extracted by SIFT. The results of the two methods are compared and analyzed. Experimental results show that the MLESAC algorithm is an efficient and stable method for stereo image pair matching with the same name. Finally, the paper summarizes the work done in this paper, and looks forward to what needs to be further studied in the field of image matching in this paper.
【學(xué)位授予單位】:中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2013
【分類號】:TP391.41;P23
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