IMAGE PROCESSING CIRCUIT AND ASSOCIATED IMAGE PROCESSING METHOD

The present invention provides an image processing circuit including a region type determination circuit and a filtering circuit. In the operations of the image processing circuit, the region type determination circuit receives pixel values of a plurality of pixels within a region of an image frame, and uses a high-pass filter to filter the pixel values many times to generate a plurality of filtered pixel values, and determines if the region is an edge region, a non-edge region or a mosquito noise region to generate a determination result. The filtering circuit generates a plurality of weights according to the determination result, and uses the plurality of weights to filter a center pixel of the plurality of pixels within the region to generate an adjusted pixel value.