De-noising method and related apparatus for image sensor

A de-noising apparatus for an image sensor including a specific color filter array and a pixel array, the pixel array including a plurality of pixels each corresponding to one of a plurality of color components, the de-noising apparatus comprising:

• a comparing circuit, for comparing a pixel value of a target pixel with pixel values of a plurality of nearby pixels, wherein each of the target pixel and the nearby pixels corresponds to a specific color component;
• a checking circuit, coupled to the comparing circuit, wherein for each nearby pixel of the nearby pixels:
• the checking circuit checks if the pixel value of the target pixel is similar to a pixel value of the nearby pixel, and when the pixel value of the target pixel is similar to the pixel value of the nearby pixel, the checking circuit sets the nearby pixel as a similar nearby pixel;
• and
• a pixel value updating circuit, coupled to the checking circuit, for updating the pixel value of the target pixel according to the pixel value of the target pixel and a pixel value of each similar nearby pixel.