Tone mapping of high dynamic range images

Details Tone mapping of high dynamic range images Tone mapping of high dynamic range images

2005-07-13

2008-10-07

Bella, Matthew C. (Department: 2624)

Image analysis

Color image processing

Color correction

C382S162000, C382S166000, C382S168000

Reexamination Certificate

active

07433514

ABSTRACT:
Tone mapping a high dynamic range (HDR) image is performed by obtaining a log-norm luminance component based on a normalized logarithm of the HDR image. The log-norm luminance component is flattened (tone-compressed) using incrementally-spaced adaptation levels, which are increasingly blurrier representations of the log-norm luminance component, weighted by a diminishing factor. Visual cues are restored by injecting a proportion of values of the log-norm luminance component, applying histogram tail clipping, and applying a sigmoid curve mapping, to create a restored luminance component. A tone-compressed image is obtained by mapping luminance of the HDR image using the restored luminance component and adjusting saturation of the mapped HDR image.

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