CIRCUIT FOR IMPROVING PICTURE QUALITY BY USING NOISE REDUCTION AND HISTOGRAM EQUALIZATION AND METHOD THEREOF

摘要

The circuit of the present invention detects a noise of an impulse component existing in an input video signal, and a noise reduction unit that outputs a noise-removed signal by tripping the detected impulse noise and a noise-removed signal, And a histogram equalizer for mapping the noise-free signal to a new gray level according to a cumulative distribution function value to output an equalized signal. The input signal is firstly removed, By histogram equalization of the signal, the contrast can be improved, and at the same time, the noise can be suppressed from being amplified and the image quality can be improved.