Digital image exposure correction
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United States of America Patent
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-
Sep 11, 2012
Grant Date -
Dec 30, 2010
app pub date -
Sep 2, 2010
filing date -
Feb 27, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
Techniques are disclosed for correcting the exposure of a digital image. An exposure predictor may be generated based on a set of images for which ground truth data are known. After identifying an optimal set of features, the exposure of the digital image may be corrected by extracting values of the selected optimal features from the image, using the predictor to predict a desired exposure correction for the image, and correcting the exposure of the image by the predicted desired amount. Exposure correction is based on a model that relates intensity of light in the world to the RGB digits of the digital image. The model comprises a gamma function that models the response of a typical monitor and a S-shaped curve that compresses the large dynamic range of the world to the small dynamic range of the RGB digit space.
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