1. An image processing system, for processing current image data of a current frame and adjacent image data of an adjacent frame, comprising: a memory; a data slicer, for dividing each of the plurality of image data into a first portion and a second portion to be stored into the memory, wherein the plurality of image data comprise data of a plurality of pixels, the first portion comprises at least one most significant bit (MSB) data of each of the pixels, and the second portion comprises at least one least significant bit (LSB) data of each of the pixels; and an image processor, for reading from the memory the first portion and the second portion of the current image data, and only the first portion of the adjacent image data for image processing of the current image data of the current frame.