Abstract
A sequence of steps to produce synthetic stereo scenes from hardcopy aerial photographs is discussed. First, a digital terrain model (DTM) is collected from existing stereo coverage by conventional photogrammetric techniques. One photograph of the pair is converted into digital form by scanning, including the fiducial or registration marks. Its position and orientation parameters are retained from the original stereo setup. The images of a synthetic stereo pair are constructed by selecting two fictitious photo stations and orientations (with reasonable base-height ratio). The three-dimensional terrain model is projected onto the fictitious photo planes and the facets `draped'' with corresponding image densities from the original scanned image. Such stereo pairs can be viewed using a split-image/stereoscope setup on a standard PC display, or on a high-resolution display using frame-sequential format and liquid crystal stereo shutter.
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