Data, on which one page of original image data should be image-processed, indicates a first block image (G1) constructed of continuous "n" lines of the original image, commenced from a top line thereof; and a second block image (G2) through an M-th block image (GM). Each of the second to M-th block images is comprised of continuous "n" lines of the original image, and overlapped portions for "d" lines are present between the first to (M-1)-th block images (G1 to GM-1) and the second to M-th block images (G2 to GM), respectively. With respect to each of the block images, (nW) pieces of pixel data indicative of this block image are supplied to an image processing circuit in both a column positional order and a line positional order, while the column position owns a top priority.

 
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