Patent ID: 6078686
Filing Date: 2000-06-20
Classification: H04N

Abstract:
An image quality enhancing circuit for enhancing image quality through a predetermined image processing on an input image signal, said circuit comprising:noise reducing means for detecting an impulse for each of an input luminance signal and input color signals and outputting a trimmed mean of a predetermined size window when said impulse is detected, and otherwise, bypassing said input signals without change;contrast enhancing means for equalizing a luminance signal of a picture unit output by said noise reducing means and outputting an enhanced luminance signal;local contrast enhancing means for detecting a local contrast defined as a difference between the value of an input sample with respect to said enhanced luminance signal and each value obtained by low-pass filtering samples in a predetermined size window including the input sample, adaptively weighting said input sample value according to said detected local contrast, and outputting a changed luminance signal; andcolor compensating means for compensating said color signals output by said noise reducing means according to said changed luminance signal.