Patent ID: 7333668
Filing Date: 2008-02-19
Classification: G09G,H04N

Abstract:
1. An image-data compressing apparatus for compressing a binary image data, the apparatus comprising: a start-focus-point setting unit that focuses on one row along a scanning direction of dot columns in the binary image data and sets one end of the one row as a start-focus point; a draw-point presence/absence setting unit that sets a draw-point presence/absence information bit indicating whether or not a draw point exists ahead of the start-focus point; a draw-start-point information setting unit that sets a draw-start point information bit indicating how many dots away from the start-focus point a draw-start point is if the draw point is present; a draw-point-number information setting unit that sets a draw-point number information bit that indicates how many draw point continues from the draw start point; and a start-focus point/draw-point presence/absence setting unit that sets a next dot to the draw point that is a subject to the set draw-point number information bit as a next start-focus point, and sets a draw-point presence/absence information bit that indicates whether or not a draw point exists ahead of the next start-focus point, wherein, after the start-focus point being set by the start-focus-point setting unit, the draw-point presence/absence setting unit, the draw-start-point information setting unit, the draw-point-number information setting unit, and the start-focus point/draw-point presence/absence setting unit repeats the process thereof for a plurality of rows corresponding to the dot columns in the binary image data, to thereby obtain a compressed data of the binary image data from a bit string of the bits set by the respective units.