Image analysis – Image compression or coding – Quantization
Reexamination Certificate
2005-01-18
2009-02-03
Bella, Matthew C. (Department: 2624)
Image analysis
Image compression or coding
Quantization
C382S232000, C382S233000, C382S244000, C382S245000, C358S003030
Reexamination Certificate
active
07486834
ABSTRACT:
Error diffusion is performed using a Floyd-Steinberg-like approach. A integer-representation of a running error is compressed by storing only its most significant bits and returning any remainder to the error diffusion processor. The running error is shifted to the right until only the desired number of significant bits remain, and this compressed error is stored. Any portion of the original running error that is lost due to the shifting is treated as a remainder and is returned to the error diffusion processor for use in calculating an adjusted current pixel value. The amount of the shift is retained in compressed form to keep track of the number of shifts needed to form a truncated running error from the compressed running error.
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Bailey James R.
Crutchfield David A.
Love Shaun T.
Bayat Ali
Bella Matthew C.
Lexmark International Inc.
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