1. A noise omitting method for an image, wherein the image includes a plurality of pixels forming a Bayer pattern, where the method comprises: (a) computing an average grey level of at least one specific type pixels in a first region of the image; (b) computing each grey level difference between the average grey level and the specific type pixels to generate a plurality of grey level difference values; (c) finding a specific pixel with a maximum grey level difference value according to the grey level difference values; (d) determining a second region according to the specific pixel and a target pixel in the first region; and (e) selectively utilizing a pixel in the second region to adjust a grey level value of the target pixel to omit noise.