Patent ID: 7098963

Claim:
A method of attenuating noise in an image signal, the method comprising: measuring an amount of noise in an input image signal by accumulating a first offset between the input image signal and a delayed output image signal for a first predetermined time; detecting an extent of movement of the input image signal based on the amount of noise measured; and forming an output image by controlling the specific weight of the input image signal and the delayed output image signal according to the detected movement to attenuate noise in the output image signal, wherein measuring the amount of noise comprises low-pass filtering the first offset signal; converting the first offset signal into a first absolute value; generating a second an offset signal of high-pass components by combining the low-pass filtered first offset signal and the first absolute value; and converting the second offset signal into a second absolute value and then accumulating the second absolute value for a second predetermined time thereby to generate an accumulated second absolute value.