Image analysis – Color image processing
Reexamination Certificate
2011-07-26
2011-07-26
Ahmed, Samir A (Department: 2624)
Image analysis
Color image processing
C382S168000, C382S169000, C382S274000, C382S190000
Reexamination Certificate
active
07986830
ABSTRACT:
Radiometric calibration of an image capture device (e.g., a digital camera) using a single image is described. The single image may be a color image or a grayscale image. The calibration identifies and analyzes edge pixels of the image that correspond to an edge between two colors or grayscale levels of a scene. Intensity distributions of intensities measured from the single image are then analyzed. An inverse response function for the image capture device is determined based on the intensity distributions. For a color image, the radiometric calibration involves calculating an inverse response function that maps measured blended colors of edge pixels and the associated measured component colors into linear distributions. For a grayscale image, the radiometric calibration involves deriving an inverse response function that maps non-uniform histograms of measured intensities into uniform distributions of calibrated intensities.
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Gu Jinwei
Guo Baining
Lin Stephen S.
Shum Heung-Yeung
Ahmed Samir A
Bayat Ali
Lee & Hayes PLLC
Microsoft Corporation
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