Abstract
A technique for creating 3D terrain models based on digital aerial images, using an algorithm of semi-global matching, is presented. A method of hierarchical application of the algorithm is demonstrated. A number of modifications and improvements at all stages of algorithm operation are proposed. Among them the following ones are distinguished: due account of the gradient and color information of images, the interpolation of the pixel matching metric for increasing the algorithm resolution and improving the stability to small distortions of the input data, filtering the matching cost and post-processing of disparity map by a bilateral filter. Results of algorithm application and the advantages of the modification are demonstrated by an example of processing of pairs of high-resolution aerial images.
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