Patent ID: 7359573
Filing Date: 2008-04-15
Classification: G06T

Abstract:
1. A contrast compensation apparatus, comprising: a pixel value detection unit to detect a distribution of pixel values of respective pixels of an input image signal; a pixel value limit unit having pre-set luminance limit values and being coupled to the pixel value detection unit, re-configuring the distribution of the pixel values of the respective pixels based on the pre-set luminance limit values; a mapping unit, coupled to the pixel value limit unit, to set a luminance of the respective pixels based on a cumulative distribution function with respect to the re-configured pixel values, and a cumulative distribution function conversion unit located between the pixel value limit unit and the mapping unit, converting the image signal based on the Formula below with the cumulative distribution function of pixel values re-configured in the pixel value limit unit: wherein N is a highest pixel value displayable when the image signal forms an image, and K denotes a pixel value.