1. An image processing method, comprising: a plurality of original color channel images is generated according to an original image; a sharpest one of the original color channel images is selected from the original color channel images as a deblurred datum color channel image; a blur radius value corresponding to an out of focus transform function between the deblurred datum color channel image and the other original color channel images is trialled, so as to obtain a plurality of target blur radius values; a deblurring operation is respectively performed on the original color channel image corresponding to each of the target blur radius values according to the target blur radius value, so as to obtain a plurality of deblurred color channel images; and the deblurred datum color channel image and the deblurred color channel images are combined to obtain a blur calibrated image.