Image analysis – Image transformation or preprocessing – Combining image portions
Patent
1996-05-06
1998-10-27
Johns, Andrew W.
Image analysis
Image transformation or preprocessing
Combining image portions
382132, 382294, 348222, 348229, 358448, 358522, 396 60, 396 61, 396 62, G06K 900, G06K 936
Patent
active
058287930
ABSTRACT:
Different exposures of an electronically represented, pictorial scene are combined into a final image having expanded dynamic range yet still capturing subtle differences in exposure. The final image provides increased shadow, midtone and highlight detail notwithstanding the limited response of the system (electronic or photographic) that produced the component images. The invention features automatic identification of optimally exposed regions (on a pixel-by-pixel basis) from the component images, as well as automatic combination into a final image. The invention may also be used to make a camera, of possibly unknown response function, behave as an array of photometric measurement instruments (e.g., an array of light meters) to within a constant scale factor.
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Johns Andrew W.
Mariam Daniel G.
Massachusetts Institute of Technology
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