1. An image registration method for image registering at least one source image to enable the images to be registered in the same coordinate system, the method comprising: (a) performing image normalization on a source image and generating a normalized image; (b) retrieving at least one color-deconvoluted image from color-deconvoluting the source image, wherein the normalized image is transformed into three color deconvoluted images according to color deconvolution, and the three color deconvoluted images are respectively a red color deconvoluted image, a blue color deconvoluted image, and a green color deconvoluted image; (c) selecting one of the three color deconvoluted images as a first image, and then determining at least one image feature from the first image; (d1) transforming a target image into at least one color deconvoluted image according to color deconvolution; (d2) selecting from the at least one color deconvoluted image corresponding to the first image as a second image; (d3) determining at least one image feature from the second image, and then setting the at least one image feature from the second image as a default structural feature; (d4) comparing the image feature of the first image with the default structural feature to generate the relative matching structural feature result; and (e) transforming the normalized image into a register image according to the matching structural feature result.