Visual Search and Image Quality

Abstract
Several experiments were conducted to evaluate alternate unitary measures of video line-scan system image quality. A metric based upon the Modulation Transfer Function of the imaging system was derived, with emphasis placed upon the photometric properties of the system. This metric was shown to predict well the average effects of several imaging system parameters upon the ability of observers to extract information from both dynamic and static images. In attempting to predict the ability of observers to acquire specific targets in an air-to-ground search task; however, other target and background parameters become very important, and such image quality measures must therefore be refined. Relationships among alternate measures of line-scan image quality were discussed, and a conceptual model was presented for combining system noise, raster interference, scene content, and the visual requirements of the observer.

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