Quantization error diffusion for digital imaging devices

Details Quantization error diffusion for digital imaging devices Quantization error diffusion for digital imaging devices

2006-07-11

2006-07-11

Patel, Kanjibhai (Department: 2625)

Image analysis

Image compression or coding

Quantization

C345S616000, C358S003030

Reexamination Certificate

active

07076110

ABSTRACT:
A quantization method and system (20) for quantizing image data. A look up table (23) is used to provide non binary values for one or more bits of an input pixel value, as well as to provide a quantization error value. The quantization may be conditional, such that the look up table (23) is used to determine whether the input pixel value is to be quantized by the look up table (23) in non binary manner or whether it is to be quantized by a conventional binary quantizer (26). Where the look up table (23) quantizes only a portion of the input value, the remaining portion is delivered to the binary quantizer (26). The result is an output value, at least some of whose bits represent non binary values.

REFERENCES:
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patent: 5377041 (1994-12-01), Spaulding et al.
patent: 5479170 (1995-12-01), Cauwenberghs et al.
patent: 6173081 (2001-01-01), Nishikawa
patent: 6608700 (2003-08-01), Mantell

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