Abstract: For each of multiple segments acquired by dividing a binary image by a predetermined under of lines, image data of a reference line corresponding to a start line of that segment is stored in an intermediate start table in association with data indicating a head coding position of the start line in code data acquired when the binary image is compressed. Based on the stored data, partial image extraction is executed.

Abstract: A rotation circuit includes a first holding section for sequentially latching n words input in units of words, in accordance with a first control instruction, each word consisting of n-bit data. The n words held in the first holding section are input to and latched by a second holding section. One bit of data is selected from each word latched by the second holding section, in accordance with a second control instruction, while the next one word is input to the first holding section, and a rotated word constituted by n bit data selected from n words is output from a selector section. The first and second control instructions are generated from a controller, in accordance with an input rotation control instruction, and are respectively supplied to the first holding section and the selector section.