Abstract
A novel method for multi-image matching by synthesizing image and object-space information is proposed. Firstly, four levels of image pyramids are generated according to the rule that the next pyramid level is generated from the previous level using the average gray values of the 3 by 3 pixels, and the first level of pyramid image is generated from the original image. The initial horizontal parallaxes between the reference image and each searching image are calculated at the highest level of the image pyramid. Secondly, corresponding image points are searched in each stereo image pair from the third level of image pyramid, and the matching results in all stereo pairs are integrated in the object space, by which the mismatched image points can be eliminated and more accurate spatial information can be obtained for the subsequent pyramid image matching. The matching method based on correlation coefficient with geometric constraints and global relaxation matching is introduced in the process of image matching. Finally, the feasibility of the method proposed in this paper is verified by the experiments using a set of digital frame aerial images with big overlap. Compared with the traditional image matching method with two images, the accuracy of the digital surface model (DSM) generated using the proposed method shows that the multi-image matching method can eliminate the mismatched points effectively and can improve the matching success rate significantly.
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Supported by the National Natural Science Foundation of China (Nos. 40771176, 40721001).
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Yuan, X., Ming, Y. A novel method for multi-image matching synthesizing image and object-space information. Geo-spat. Inf. Sci. 12, 157–164 (2009). https://doi.org/10.1007/s11806-009-0063-x
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DOI: https://doi.org/10.1007/s11806-009-0063-x
Keywords
- multi-image matching
- digital surface model (DSM)
- cross correlation matching with geometric constraints
- relaxation matching
- matching success rate