1 October 1992 Efficient fax transmission of halftone image sequences
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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.
Kevin J. Parker, Hei Tao Fung, "Efficient fax transmission of halftone image sequences," Journal of Electronic Imaging 1(4), (1 October 1992). https://doi.org/10.1117/12.61061 . Submission:

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