Image quality improvement method and system for adaptively improving contrast based on histogram dispersion

摘要

The present invention discloses an image quality improvement method and apparatus for adaptively improving contrast based on histogram dispersion. The present invention relates to a histogram equalizer that detects a histogram distribution of an input image signal represented by a predetermined number of gray levels, maps an input image using an accumulated density function corresponding to the integration of the histogram distribution, and provides an equalized image, A histogram distribution detector for detecting the variance of the histogram distribution of the input image and a controller for adjusting the equalization degree of the adaptively equalized image according to the variance to detect the histogram dispersion from the histogram of the input image itself, Based on the histogram equalization, the mixing ratio between the image output and the input image is adjusted to provide adaptive characteristics to the mapping function to provide improved image quality.