Patent ID: 8411942
Filing Date: 2013-04-02
Classification: H04N

Abstract:
1. A method of compressing a color image, said method comprising: receiving the color image derived from a page description language, the color image comprising at least one image tile, data of the tile defining: (i) positions of boundaries of a region within the image tile, the region comprising pixels of substantially identical color, wherein the region extends over a plurality of scanlines of the image tile; and (ii) a fill color for the region; assessing a visual significance metric of the region based on a length of the region and a width of the region; determining whether or not a color palette buffer has overflowed, the color palette buffer storing an indexed array of unique color values that are used within the tile; selecting a compression path type for the tile based on the visual significance metric of the region and the determination of whether or not the color palette buffer has overflowed; and compressing the tile using the selected compression path type.