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Journal of Electronic Imaging

Efficient fax transmission of halftone image sequences
Author(s): Kevin J. Parker; Hei Tao Fung
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Paper Abstract

We propose an algorithm in which a sequence of digital halftone images is efficiently transmitted using encoding compatible with conventional facsimile devices. To enhance the CCITT standardized coding schemes for Group 3 and Group 4 facsimile apparatus, pre-encoding is done on each image in the sequence: The image is either pre-encoded as a combination of bit representation of block means and an "error" image, according to the ToneFac algorithm, or it is pre-encoded as an "interimage" in which interframe redundancy is converted into spatial redundancy, and the least "busy" of the above images is encoded and transmitted. The approach is referred to as the ToneSec algorithm.

Paper Details

Date Published: 1 October 1992
PDF: 8 pages
J. Electron. Imaging. 1(4) doi: 10.1117/12.61061
Published in: Journal of Electronic Imaging Volume 1, Issue 4
Show Author Affiliations
Kevin J. Parker, Univ. of Rochester (United States)
Hei Tao Fung, University of Rochester (United States)


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