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Image Quality Enhancement

Report Number: AMRL TR 65-28
Author: Brainard, Robert W.
Author: Ornstein, George N.
Corporate Author: North American Aviation Incorporated
Laboratory: Behavioral Sciences Laboratory
Date of Publication: 1965-04
Pages: 64
Contract: AF 33(616)-7996
Project: 7183
Task: 718302
AD Number: AD0616895

A technique for enhancing the quality of imagery was investigated. The technique consists of obtaining a video signal from a transparency and adding to this signal its first and/or second derivative(s). The efficacy of the technique was evaluated by comparing imagery produced by the video signal and its derivative(s) with imagery produced by the video signal alone. The imagery investigated consisted of standard test patterns and aerial photographs. The processed test patterns were quantitatively analyzed to determine the resolution, contrast and acutance of the imagery. The results indicate: (1) differentiation enhances image quality, as indicated by the resolution, contrast and acutance metrics, (2) greatest enhancement is produced by operations which include second-order differentiation, and (3) the least enhancement is produced by first-order differentiation. The aerial photographic imagery shows the same enhancing effects as those obtained with the test patterns.

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