HISTOGRAM ADJUSTMENT FOR HIGH DYNAMIC RANGE IMAGE MAPPING

A histogram adjustment for high dynamic range image mapping is provided to reproduce a local contrast and fine details of backgrounds automatically at a high speed without using artifacts. A memory stores a command indicating image data with respect to an image as a luminance value, a command determ...

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Bibliographic Details
Main Authors DANCE CHRISTOPHER R, BRESSAN MARCO, QUI GUOPING, DUAN JIANG
Format Patent
LanguageEnglish
Published 21.11.2007
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:A histogram adjustment for high dynamic range image mapping is provided to reproduce a local contrast and fine details of backgrounds automatically at a high speed without using artifacts. A memory stores a command indicating image data with respect to an image as a luminance value, a command determining a key value as a function of an average luminance value of the image and minimum and maximum luminance values of the image, a command generating offset-adjusted luminance values including a command applying an offset, which is the function of the determined key value, to each luminance value, and a command calculating a tone reproducing curve with respect to at least one region of the image including a command applying a mapping function to the offset-adjusted luminance values. A processor(22) executes the commands and outputs a processed image.
Bibliography:Application Number: KR20070048031