Showing papers on "Image registration published in 1973"

Apparatus for image processing

Abstract: A special purpose pipeline digital computer is disclosed for processing a pair of related, digitally encoded, images to produce a difference image showing any dissimilarities between the first image and the second image. The computer is comprised of a number of special purpose pipeline processors linked to a supervisory general purpose processor. First, a initial image warp transformation is computed by a spatial transformation pipeline processor using a plurality of operator selected, feature related, match points on the pair of images, and then, image correlation is performed by a dot product processor working with a square root and divide processor to identify the exact matching location of a second group matching points selected in a geometrical pattern, on the pair of images. The final image warp transformation to achieve image registration occurs in the spatial transformation processor, using a localized polylateral technique having the geometrically selected match points as the vertrices of the polylaterals. Finally, photoequalization is performed and the difference image is generated from the pair of registered images by a photoequalization processor.

Automatic information extraction for land use and agricultural applications

Abstract: Description of some current work in interpretation technique development for automatic computer-aided image information extraction related to various application areas, including land use mapping and agricultural survey and monitoring In particular, the application of a fast template matching algorithm, employing the sequential similarity detection principle, to image registration, linear feature detection, and the extraction and enumeration of scene objects is discussed and illustrated

Image analysis techniques associated with automatic data base generation.

Abstract: This paper considers some basic problems relating to automatic data base generation from imagery, the primary emphasis being on fast and efficient automatic extraction of relevant pictorial information. Among the techniques discussed are recursive implementations of some particular types of filters which are much faster than FFT implementations, a 'sequential similarity detection' technique of implementing matched filters, and sequential linear classification of multispectral imagery. Several applications of the above techniques are presented including enhancement of underwater, aerial and radiographic imagery, detection and reconstruction of particular types of features in images, automatic picture registration and classification of multiband aerial photographs to generate thematic land use maps.