Medical image comparison method and system thereof

A medical image comparison system, comprising:

• an image processing device, further comprising:
• an image capturing module, for obtaining a plurality of images of a body at different time points, while allowing the plural images to include a first image captured at a first time point and a second image captured at a second time point;
• a feature extracting module, coupling to the image capturing module, for obtaining a first feature point group by detecting feature points in the first image, while obtaining a second feature point group by detecting feature points in the second image;
• and
• an information alignment module, coupling to the feature extracting module, for aligning the second image with the first image according to the first feature point group and the second feature point group so as to generate an overlapping image information, while enabling the overlapping image information to include a first matching image corresponding to the first image and a second matching image corresponding to the second image;
• and
• an image calculation device, coupling to the image processing device, further comprises:
• a difference comparison module, provided for sequentially extracting corresponding window areas from the first matching image and the second matching image in the overlapping image information respectively by the use of a sliding window mask, while calculating an image difference ratio for each of the window areas according to the ratio between the number of matching points and the number of unmatched points in the corresponding window areas of the first and the second matching images.