Video signal noise reduction apparatus, a method of reducing a noise in a video signal, and a recording medium storing a program of the method

摘要

A pixel data outputting circuit outputs center and peripheral pixel data from a video signal. A difference calculation circuit calculates differences of the peripheral pixel data from the center pixel data. A correlation pixel data detecting circuit detects a portion of the peripheral data showing high correlation according to the differences and a threshold value. A counter counts the portion of the peripheral data showing high correlation. A selecting circuit responsive to the correlation pixel data detecting circuit selectively outputs a portion of the differences of the portion of the peripheral data. A summing circuit obtains a sum of the portion of the differences in accordance with the counting result. A dividing coefficient generating circuit generates a dividing coefficient of 2<n >according to the counting result. A dividing circuit divides the sum with the dividing coefficient. An adding circuit adds the dividing result to the center pixel data to generate an output video signal. A weighting circuit weights each of the portion of differences according to the predetermined priority, wherein the summing circuit obtains the sum from the weighted differences. The corresponding method and the corresponding recording medium storing the method are also disclosed.