Patent ID: 8705883

Claim:
A noise reduction device comprising: a line buffer that stores a blend value obtained by blending a pixel value stored in the line buffer with a processing target pixel value at a given ratio, wherein the line buffer stores by an amount of one line of pixels of an image, and wherein when the blend value is stored in the line buffer by an amount of one line for each of Cb data and Cr data, a ratio at which the blend value in the line buffer is blended with the target pixel value is varied on the basis of whether a color difference between the blend value in the line buffer and the target pixel value is less than a first threshold; a selector that selects the blend value when a difference between the blend value in the line buffer and the target pixel value is less than a second threshold, and that selects the target pixel value when the difference is greater than or equal to the second threshold, and a counter that counts the number of times the similar sign of the difference between the blend value in the line buffer and the target pixel value successively occurs, and wherein when it is determined on the basis of the counted result that the number of times a variation in pixel value successively occurs is greater than a set number of times, the blend value in the line buffer is discarded and the target pixel value is stored in the line buffer.