Method and apparatus for adjusting the contrast of an image

摘要

A method and apparatus adjusts the contrast of an input image formed of pixels. Each pixel in the input image (11) has an input brightness level. At least some of the pixels in the output or enhanced image (16) have an output brightness level that is different from their input brightness level. Brightness level data of the input image (11) is filtered (12) to obtain a high frequency component of the input image (11) in a single operational stage. The high frequency component is amplified (13). The original image and the amplified high frequency component are summed (15) to produce brightness level data of the output image (16).