Appeal No. 2005-0444
Application No. 10/025,671
marks to be rendered in image data based on the direction of the
edges of the mark (specification, page 1). Thus, by
differentiating between continuous tone data and non-continuous
tone data the compression and decompression can be tailored to
the information within the data necessary for printing the
particular type of data (specification, page 9).
Representative independent claims 1, 13 and 15 are
reproduced below:
1. A method for decompressing image data, that is
compressed by discarding pixels along a direction parallel to an
edge while maintaining pixels along a direction perpendicular to
the edge, representing a plurality of pixels and represented by a
plurality of bitwords, each pixel corresponding to a separate
bitword, the process comprising:
decompressing data from a compressed-data-bitword to
provide data indicative of a plurality of explicit pixels;
and
synthesizing data from the data indicative of the
plurality of explicit pixels to provide data corresponding
to at least one synthesized pixel, the at least one
synthesized pixel representing at least one discarded pixel.
13. A method for decompressing compressed image data that
is compressed by discarding pixels along a direction parallel to
an edge while maintaining pixels along a direction perpendicular
to the edge, the method comprising:
decompressing a single byte of compressed data to
produce four pixels of non-continuous tone data.
15. A decompression system for decompressing image data,
the image data containing non-continuous tone data and continuous
tone data, the non-continuous tone data compressed by discarding
pixels along a direction parallel to an edge while maintaining
2
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