1. An image processing method, adapted for a mobile electronic device, comprising: deriving an original image, wherein the original image comprises a plurality of pixels; and executing a calculating procedure according to the original image to derive an up-sample image of the original image, and the calculating procedure comprising: making the up-sample image to be overlapped with the original image; deriving at least one of the pixels of the original image overlapped with an n th pixel of the up-sample image and a pixel value of the at least one of the pixels, wherein a value of n ranges between 1 and N, and N corresponds to a pixel amount of the up-sample image; deriving a proportion between the at least one of the pixels of the original image overlapped with the n th pixel of the up-sample image and the n th pixel, and setting the proportion as a weight; and calculating a pixel value of the n th pixel of the up-sample image according to the pixel value of and the weight corresponding to the at least one of the pixels of the original image overlapped with the n th pixel of the up-sample image.