Patent ID: 8238685

Claim:
An image noise reduction method, comprising: receiving an image; performing a first-stage process to the image to obtain a luminance information Y and a color information Cb and/or Cr corresponding to a pixel array in an YCbCr domain; performing a second-stage process with respect to the luminance information Y, to reduce at least a luminance noise; performing a third-stage process with respect to the color information Cb and/or Cr to reduce at least a color noise; and combining the luminance information Y and the color information Cb and/or Cr, wherein the second-stage process and the third-stage process are respectively performed through a Pascal triangle low-pass filtering method, and the Pascal triangle low-pass filtering method comprises: dividing each data stream in a first direction of the pixel array into a first data portion and a second data portion, wherein the first data portion is a current unprocessed data of the pixel array, the second data portion shifts n pixels relative to the first data portion, n≧1, n pixels of the second data portion which exceed a boundary region of the pixel array are set to be a predetermined value; averaging the first data portion and the second data portion to obtain a low-pass filter image; and performing a recurrence process according to the low-pass filter image and aforementioned steps to achieve a desired number of filter orders; determining a boundary region according to a boundary judgment mechanism; and adjusting the desired number of filter orders according to the boundary region.