An improvement of multi-step correlation method for stereo matching of aerial photographs. I. Finding occlusions using median filtering.:—Finding Occlusions Using Median Filtering—

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The authors proposed recently a matching method of aerial photographs based on a so-called coarse-to-fine method. But it is not provided with a routine for processing images containing occluding areas. They attempt in this pafer to incorporate a routine for finding and processing occlusions. The discussion proceeds along the following outline.<BR>(1) In the authors' method, measured x-parallaxes are low-pass-filtered fo filter the higher frequency noises included in them. But this operation forcibly reproduces the occluding terrain to be of smooth shape.<BR>(2) The low-pass filter is substituted for the median filter which is characterized by preserving abrupt changes of x-parallaxes across the occlusions. The procedure for finding occlusions is carried out by use of this filter.<BR>(3) It is demonstrated that the procedure (2) is valid in principle. But because matching stability of the authors' current method is still insufficient, a few wanderings occur even at other points than occlusions and they disturbe the correct matching.
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