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26 August 2008 Image fusion and sampling artifacts
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Successful fusion combines salient features of each image to produce a new fused image with more "information". Although different sensors have different spatial resolutions, they tend to be detector-limited and this usually does not significantly affect fusion. The biggest problem with sensor fusion is that the number of detectors on each array is different. If the number of pixels on target are made equal (the desired design), then the fields-of-view are different. This may affect operational effectiveness. If the fields-of-view are equal, then pixels on target are different. This accentuates phasing effects, increases target edge ambiguity, and overall makes fusion more difficult. Sampling artifacts are most noticeable with man-made objects and are pronounced with periodic targets (bar targets).
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Gerald C. Holst "Image fusion and sampling artifacts", Proc. SPIE 7094, Unconventional Imaging IV, 709406 (26 August 2008);

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