Partial pixel encoding and decoding method

Details Partial pixel encoding and decoding method Partial pixel encoding and decoding method

1995-08-31

1998-03-31

Rogers, Scott A.

Image analysis

Image compression or coding

Gray level to binary coding

382239, 358429, 358430, H04N 141

Patent

active

057347530

ABSTRACT:
A method for partial pixel encoding and decoding of an extended resolution halftone image. The image is represented by a plurality of pixels and each pixel contains a number of sub-pixels. First, a group of pixels from the plurality of pixels is defined. The group of pixels is consolidated so that at most one pixel (i.e., a partial pixel) in the group has a sub-set of the plurality of sub-pixels set. Those fully-on or fully-off pixels in the group are stored in a bitmap. The corresponding bit in the bitmap is set if the partial pixel has more than half of its sub-pixels set otherwise it is reset. Next, the position of the partial pixel is stored in memory. Finally, an indicator is stored in memory, where the indicator in combination with the corresponding bit describe how many of the sub-pixels in the partial pixel are set. Decoding is performed in the reverse order.

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patent: 5050000 (1991-09-01), Ng
patent: 5243446 (1993-09-01), Pollich et al.
patent: 5453843 (1995-09-01), Levy

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