Image analysis – Histogram processing – With a gray-level transformation
Reexamination Certificate
2005-06-20
2008-12-09
Bella, Matthew C (Department: 2624)
Image analysis
Histogram processing
With a gray-level transformation
C382S167000, C382S168000, C382S274000, C382S171000, C382S172000, C358S521000, C348S222100, C348S362000
Reexamination Certificate
active
07463769
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
Bayat Ali
Bella Matthew C
Lee & Hayes PLLC
Microsoft Corporation
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