Image analysis – Color image processing – Compression of color images
Reexamination Certificate
2007-12-10
2011-10-04
Alavi, Amir (Department: 2624)
Image analysis
Color image processing
Compression of color images
C345S420000
Reexamination Certificate
active
08031937
ABSTRACT:
Methods and apparatus are disclosed for the processing of frame buffer data, such as color buffer data, in graphics processing applications. Although more generally applicable, these methods and apparatus are particularly useful in real-time, polygon-based, 3D rendering applications. An exemplary method for processing graphics data according to one or more embodiments of the invention begins with the retrieval, from a buffer, of pixel values corresponding to a tile of two or more pixels, and with the updating of one or more of those updated pixel values. The updated pixel values are selectively compressed using a lossy compression operation or a lossless compression operation, based on an accumulated error metric value for the tile. If lossy compression is used, then the accumulated error metric value for the tile is updated; in either event, the compressed pixel values are stored in the frame buffer for further processing. With this approach, the accumulated error caused by successive, or tandem, compression operations may be limited to a pre-determined maximum.
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Akenine-Möller Tomas
Hasselgren Jon
Munkberg Jacob
Rasmusson Jim
Alavi Amir
Coats & Bennett P.L.L.C.
Telefonaktiebolaget LM Ericsson (publ)
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