Method for beautifying human face in digital image

A method for beautifying a human face in a digital image, adapted to remove noises on the skin of a human face in an input image, the method comprising:

• a. selecting a partial image area in the input image as a selection window;
• b. setting a target pixel in the selection window, and setting other pixels as comparison pixels;
• c. performing a detail checking process according to a variance between the target pixel and the comparison pixels to determine whether the target pixel has detail information or not;
• d. if the target pixel has the detail information, performing a luminance checking process on the target pixel to determine whether the target pixel is within a luminance range or not;
• e. if the target pixel is within the luminance range, performing a nonlinear filtering process to filter the target pixel by using a nonlinear filter to generate a filtered value, and providing a mixing ratio to mix the target pixel with the filtered value at the mixing ratio to generate a completed pixel, and replacing the target pixel with the completed pixel;
• and
• f. repeating Step a to Step e until all pixels in the input image are completed, and outputting a target image.