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I think it has been generally explained.
Each image of the object will have the main features of the object the same. Recording of noise pulse will be random. Fuzzy edges mostly caused by air movement will be random. Errors on the chip will be corrected by darks and lights.
The result then is to add the main features of every frame. However the items that are random will not add on every frame. In fact some will even cancel. The net result is the sharpening of edges and accentuation of the main features.
Barry
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