Robert A. Schowengerdt

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We have classified four different images, under various levels of JPEG compression, using the following classification algorithms: minimum-distance, maximum-likelihood, and neural network. The training site accuracy and percent difference from the original classification were tabulated for each image compression level, with maximum-likelihood showing the(More)
The two-pass (or multipass) image geometric transformation algorithm is ideally suited to real-time, parallel implementation, but is known to introduce frequency aliasing during rotation, over and above any aliasing which may result from the usual one-pass algorithm. We develop a unified framework and theory that precisely explains this added-aliasing for(More)
Techniques for incorporating airborne video into a multimedia GIS for traffic flow visualization are described. The base layer of the GIS consists of mosaiced aerial orthographic images of Tucson. Digitized non-roadway segments serve as a mask to emphasize roadways. A helicopter with a sophisticated on-board attitude measurement system was used to collect(More)