Recognition of Elevation Symbols and Reconstruction of 3D Surface from Contours by Parallel Method (Special Issue on Document Analysis and Recognition)

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In this paper, symbols and numerals in topographic maps are recognized by the multi-angled parallelism (MAP) matching method, and small dots and lines are extracted by the MAP operation method. These results are then combined to determine the value, position, and attributes of elevation marks. Also, we reconstruct three dimensional surfaces described by contours, which is difficult even for humans since the elevation symbols are sparse. In reconstruction of the surface, we define an energy function that enforces three constraints: smoothness, fit, and contour. This energy function is minimized by solving a large linear system of simultaneous equations. We describe experiments on 25,000: 1 scale topographic maps of the Tsukuba area.
社団法人電子情報通信学会の論文
1994-07-25