Image compression in retained-mode renderer

Image analysis – Image compression or coding – Including details of decompression

Reexamination Certificate

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Details

C382S232000, C382S245000

Reexamination Certificate

active

10391605

ABSTRACT:
A method (200) and apparatus (100) for compressing an image is disclosed. The image is provided as one or more runs of pixels on a scanline basis. The runs of pixels represent one or more graphical objects forming the image. For each scanline of the image, pixel difference values between each adjacent pixels of at least one run of pixels of the scanline is determined. The pixel difference values for the run of pixels are then compared to predetermined difference values. One or more coded bytes are determined for the run of pixels depending on the comparison, each of the coded bytes representing a difference value between at least two adjacent pixels of the run of pixels. The one or more coded bytes are then stored as a compressed representation of the run of pixels corresponding to the scanline of the image.

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patent: 6624823 (2003-09-01), Deering
patent: 6721455 (2004-04-01), Gourdol
patent: 6721456 (2004-04-01), Aschenbrenner et al.
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patent: 6980220 (2005-12-01), Politis
patent: 1 113 395 (2001-07-01), None
patent: WO 97/07635 (1997-02-01), None
patent: WO 01/77996 (2001-10-01), None

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