1. An image processing method carried out by an image processing system which includes an image output device, a transmission interface and an image reception device, comprising: using the image output device to generate a scale-down image according to a source image in which the scale-down image has the size smaller than the size of the source image; using the image output device to generate a plurality of divided images of the same size according to the scale-down image in which each of the divided images has the size smaller than the size of the scale-down image; using the image output device to compress the divided images so as to generate a plurality of encoded image; using the image output device to output the plurality of encoded images to the image reception device through the transmission interface; using the image reception device to decompress the plurality of encoded images to recover the plurality of divided images; and using the image reception device to generate a display image according to the plurality of divided images in which the display image has the size larger than the size of any of the divided images.