1. A digital image processing device, comprising: a digital image capturing module, capturing a plurality of first resolution images; an image enlarging module, coupled to the digital image capturing module, and enlarging a resolution of the first resolution images to produce a plurality of second resolution images; an image correcting module, coupled to the image enlarging module, and selecting one of the second resolution images to serve as a target image, and taking the remaining second resolution images as a plurality of unselected images, wherein the image correcting module performs a plurality of motion corrections on the unselected images respectively to produce a plurality of corrected images; and an image blending module, coupled to the image correcting module, and performing a plurality of direction gradient operations on each of pixels of the target image and each of pixels of the corrected images, and performing a weighting sum operation on each of the pixels of the target image and each of the pixels of the corrected images according to a plurality of gradient differential values generated by the direction gradient operations, so as to produce a third resolution image, wherein a resolution of the third resolution image is higher than a resolution of the second resolution images.