Patent ID: 6674486
Filing Date: 2004-01-06
Classification: H04N

Abstract:
A video signal processor, comprising:a sharpening circuit capable of receiving an input luminance signal, the sharpening circuit having a transversal filter, the transversal filter being operable to filter the input luminance signal to produce an intermediate signal and to produce a filtered luminance signal having a time lag, the sharpening circuit being operable to multiply the filtered luminance signal by a predetermined factor to produce a weighted signal including the time lag, to adjust the time lag to produce a resultant luminance signal, and to add the resultant luminance signal to the intermediate signal; and a non-correlation detecting circuit for detecting noise or fluctuation in the intermediate signal, the non-correlation detecting circuit being operable to set the predetermined factor to a selected value based upon the presence of at least one of the noise or the fluctuation in the intermediate signal, wherein, when the intermediate signal is detected by said non-correlation detecting circuit to contain the noise but not the fluctuation, said sharpening circuit performs noise canceling to subtract at least a portion of the noise from the resultant luminance signal.