1. An image processing method, comprising: generating a plurality of original color channel images according to an original image; respectively executing a feature point recognition algorithm on the original color channel images to find out a plurality of feature points in each of the original color channel images; obtaining transformation matrixes between every two of the original color channel images according to the feature points; selecting a shift datum color channel image from the original color channel images, wherein the original color channel image corresponding to the shift datum color channel image has a minimum distortion; transforming the other original color channel images according to the transformation matrixes corresponding to the shift datum color channel image, so as to obtain a plurality of shift calibrated color channel images; and combining the shift datum color channel image and the shift calibrated color channel images to obtain a shift calibrated image.