A contrast compensation apparatus and a method thereof utilize a
simplified hardware structure and a low contrast distortion. The contrast
compensation apparatus includes 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 re-configuring the distribution of the pixel values of the respective
pixels based on the pre-set luminance limit values, and a mapping unit to
set luminance for the respective pixels based on a cumulative
distribution function with respect to the re-configured pixel values.
When certain portions of an image are rendered very bright or dark, the
phenomenon in which the entire image becomes abruptly bright or dark is
reduced. Further, the contrast compensation apparatus uses the minimum
number of multipliers, adders, and subtractors only, thus having an
advantage of simplified structure and using less electric power.