Automatic DEM generation by multi-image feature based matching
نویسنده
چکیده
One of the major difficulties in the automatic generation of digital elevation models (DEMs) is the procurement of approximate values. This presentation shows a new development based on the extraction of discrete points by an interestoperator and epipolar line intersection techniques in multiple overlapping images. The method can be considered an extension of well-known automatic DEM generation approaches from a stereo technique to a multi-image technique, and it solves the problem of provision of approximate values inherently. In contrast to most stereo-based techniques, the approach is not based on image pyramids, but on the consequent exploitation of the geometric strength of multiple images, implemented via the intersection of epipolar lines. Although not outlined for a complete DEM generation yet, the method may be very valuable for a hypothesis-free generation of good approximate values for other (e.g. area-based) DEM generation techniques or for the refinement of automatically generated DEMs degraded by smoothing effects. Applications of the technique to DEM generation in mountain regions based on scanned overlapping imagery of a regular block with 80%/60% overlap and on stillvideo imagery taken from a helicopter showed good results and blunder rates of 0 0.5% without introducing assumptions on the maximum steepness of the terrain and without any post processing.
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