System and method for image luminance transformation

Details System and method for image luminance transformation System and method for image luminance transformation

2006-10-24

2006-10-24

Bella, Matthew C. (Department: 2676)

Computer graphics processing and selective visual display system

Computer graphics processing

Attributes

C345S593000, C382S167000, C358S518000

Reexamination Certificate

active

07126610

ABSTRACT:
An image conversion system for altering an image to adjust the overall brightness of the image when displayed is provided. The image conversion system includes a luminance transformer and a color adjuster. To adjust the overall brightness of the image, the luminance transformer reverses the luminance of each original color in the image. The new luminance of each transformed color is then compared to the desired luminance for that color. When the transformed colors do not have the desired luminance, the color adjuster modifies the hues of transformed color to achieve the desired luminance. Specifically, the color adjuster modifies the transformed color using a weighted average to achieve the desired luminance while maintaining the hues of the original color to the extent possible. By substituting each original color with a transformed color that is adjusted as needed to reach the desired luminance, the overall brightness of the image is adjusted.

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