Patent ID: 7885485

Claim:
An image signal processor for processing an input image signal to output an output image signal comprising: an input unit receiving the input image signal; a noise removal unit receiving the input image signal output from the input unit, wherein the noise removal unit is configured to remove noise from the input image signal to generate a noise filtered image signal; and a scaler receiving one of the input unit and the noise filtered image signal output from the noise removal unit, wherein the scaler is configured to one of reduce, maintain, and magnify an image size of an input image signal input thereto, wherein when the input image signal is used to form a main picture of a picture-in-picture (PIP image, the image signal processor uses a route control signal to route the input image signal from the input unit to the scaler via the noise removal unit, and wherein when the input image signal is used to form a sub picture of the PIP image, the image signal processor uses the route control signal to route the input image signal from the input unit directly to the scaler without passing through the noise removal unit, and wherein the scaler reduces the image size of the input image signal when the image size of the input image signal is larger than the image size of the output image signal to generate a reduced image and stores the reduced image signal in a memory, and wherein the scaler maintains or magnifies an image size of an image signal stored in the memory and outputs the image signal with a maintained or magnified image size as the output image signal.