Image manipulating system and method

An image comparing system comprising:

• a processing unit;
• a storage unit connected to the processing unit and storing a plurality of programs to be executed by the processing unit, wherein the storage unit comprises:
• a reading module to acquire a pixel value of each pixel in two images respectively;
• a converting module to calculate ratios between the pixel value of each pixel and a pixel value of each other pixels which are adjacent to the pixel, for obtaining two groups of relative values corresponding to the two images respectively;
• a storing module to store the two groups of relative values;
• and
• a comparing module to compare the two groups of relative values to determine whether the two images are the same.