Facsimile and static presentation processing – Facsimile – Reduced time or bandwidth for static image communication
Patent
1991-12-18
1995-08-15
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Reduced time or bandwidth for static image communication
3582613, 3582621, 358432, H04N 100
Patent
active
054424585
ABSTRACT:
An encoding method is described for image bitplanes whereby an arithmetic coder using conditioning contexts based on pixels from both the current bitplane and previously decoded bitplanes is employed. For the same number of contexts (which is important for minimizing memory usage), the method provides for higher compression than those methods based on a single bitplane context. An additional improvement over the prior art is that the method eliminates the need to form a Gray code bit plane representation, as is commonly done to reduce the correlation among bit planes. However, if used on conjunction with the gray code, a small improvement in compression performance will still be realized.
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Melnychuck Paul W.
Rabbani Majid
Coles Sr. Edward L.
Eastman Kodak Company
Grant II Jerome
Watkins Peyton C.
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