Facsimile and static presentation processing – Facsimile – Reduced time or bandwidth for static image communication
Patent
1992-08-28
1993-11-30
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Reduced time or bandwidth for static image communication
358432, 382 56, H04N 141, G06K 936
Patent
active
052670511
ABSTRACT:
A system for processing a bit map of pixel data signals representative of a multi-dimensional array of imagery data (e g. alpha-numeric text) for transmission over a facsimile communication channel are compressed by providing a plurality of data compression units, a respective one of which is capable of compressing data supplied to it at a compression rate that is only a fraction of the data rate. The bit map is subsampled by demultiplexing the bit map into sub-arrays of data. The sub-array data is coupled to respective sets of compression units, which executes parallel, two-dimensional compression of the demultiplexed sub-array data. Even though the data subsamples associated with successive rows of the bit map are non-consecutive, and therefore may contribute to a reduction in compression performance in the horizontal direction, because the data is text, successive data samples within each column of a sub-array are inherently more highly correlated with one another than data values that are encountered within respective rows of the original bit map. As a consequence, the two-dimensional data compression operator executed by each unit suffers no loss in output signal quality.
REFERENCES:
patent: 4495562 (1985-01-01), Yamaji et al.
patent: 4706265 (1987-11-01), Furukawa
patent: 4754492 (1988-06-01), Malvar
patent: 4772956 (1988-09-01), Roche et al.
patent: 5033106 (1991-07-01), Kita
patent: 5057940 (1991-10-01), Murakami et al.
Dellert David W.
Weiner Frank
Coles Sr. Edward L.
Dudley Mark Z.
Eastman Kodak Company
Huang Stuart T. F.
Lee Thomas D.
LandOfFree
High speed compression of imagery data does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High speed compression of imagery data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High speed compression of imagery data will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2101058