Accession Number : ADA017764

Title :   Image-Image Correlator Advanced Concepts.

Descriptive Note : Final technical rept. Feb 74-Jun 75,


Personal Author(s) : Abshier,James O.

Report Date : SEP 1975

Pagination or Media Count : 109

Abstract : Photographic imagery is converted to video signals which can be processed by computer and control equipment. Electronic signal processing offers great flexibility, but is limited by the amount of imagery that can be processed at any one time. Optical techniques can handle much larger areas of imagery but it is difficult to derive and apply the control signals required to process this imagery. The recent application of epipolar scanning of stereophotographs in the AS-11B-X stereomapper has permitted faster sensing and processing of photographic imagery. This system uses an electronic correlator for processing. A system design concept was developed using parallel-channel coherent-optical image-image correlation techniques to extract terrain elevation data from aerial photographs. The speed of the correlator is only about one-fourth that possible with the present AS-11B-X system. Compared to the AS-11B-X system, the image-image optical correlator is also less capable of handling variations in photographic imagery characteristics.

Descriptors :   *Image processing, *Aerial photography, Stereophotography, Parallel processing, Optical images, Plotting, Graphics

Subject Categories : Cartography and Aerial Photography

Distribution Statement : APPROVED FOR PUBLIC RELEASE