IMAGE QUALITY EVALUATION BY OPTICAL ANALOG TRANSFORM TECHNIQUES.
Final rept. Jul-Nov 67,
CORNELL AERONAUTICAL LAB INC BUFFALO N Y
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This report presents the results of a novel method for quantitatively assessing the quality characteristics of reconnaissance photographs by optical analog transform techniques. The method is desirable because it is simple, objective, and amenable to automation. It involves placing reconnaissance photographs in the object plane of a spatial filtering apparatus and measuring the power levels in two spatial frequency regions. One region is in the middle frequencies where contrast and transfer function affect the power. The other region is in the high frequencies where granularity affects the power. The quotient of these powers midhigh is the quality measure. It is concluded that the method is useful when scene complexity is adequate and constant. Recommendations are made for improvements to the system to extend its usefulness to less complex scenes and possibly compare photographs of scenes of different complexity. Author
- Cartography and Aerial Photography