Histogram adjustment for high dynamic range image mapping

Details Histogram adjustment for high dynamic range image mapping Histogram adjustment for high dynamic range image mapping

2006-05-17

2009-12-29

Bhatnagar, Anand (Department: 2624)

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

C382S168000, C382S169000, C382S254000, C345S589000, C345S617000, C348S234000, C348S254000

Reexamination Certificate

active

07639893

ABSTRACT:
A method of automatic mapping of image data includes representing image data for an image as luminance values, determining a key value as a function of an average luminance value of the image and of minimum and maximum luminance values of the image, generating offset-adjusted luminance values including applying an offset to each of the luminance values, the offset being a function of the determined key value, and computing a tone reproduction curve for at least a region of the image which includes applying a mapping function to the offset-adjusted luminance values.

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