Stereo plotting from aerial photographs with patch by patch correlation.

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  • 分割画像ごとの相関法による空中写真からの自動図化
  • ブンカツ ガゾウ ゴト ノ ソウカンホウ ニ ヨル クウチュウ シャシン カラ

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This paper proposes a patch by patch correlation method for automatic stereo plotting from aerial photographs for the control of matching wanderings, where matching is made on all over a fairly large patch area rather than at every each point. Its effectiveness is evidenced in the experiments.<BR>The structure of the algorithm is as follows;<BR>1) A stereo image pair is subdevided to overlapping patch pairs, each consisting of about 250 by 250 pixels and 250 by 400 pixels for the left and right patches respectively. Matching process is done independently for each patch pair.<BR>2) The grid points are allocated on the left patch and their conjugates are searched. At the start matchings are done coarsely using low frequency components of the images, converged step by step to fine details using high frequency components. In accordance with this coarse-to-fine process the grid points are disposed sparcely at the first step and their density is increased step by step.<BR>3) It is essential in this method to pose the positional constraint on the matched points to keep the geometrical consistency.<BR>4) Phase distortions of the images due to terrain reliefs are eliminated by iterative correlation.

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