Data compression device for picture processing apparatus

Details Data compression device for picture processing apparatus Data compression device for picture processing apparatus

1984-06-04

1986-08-26

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358261, H04N 144

Patent

active

046086072

ABSTRACT:
A data compression device for a facsimile apparatus or like picture processing apparatus is operable with a desirable coding efficiency to remarkably reduce the transmission time. When the absolute value of a difference between the numbers of transition points of picture signals associated with two adjacent scanning lines is larger than a predetermined run difference coefficient, the device codes the picture signals by a one-dimensional mode coding operation which occurs with respect to the main scan direction only. When the former is equal to or smaller than the latter, the device codes the picture signals in a two-dimensional mode coding operation which occurs with respect to both the main scan direction and the subscan direction.

REFERENCES:
patent: 3830964 (1974-08-01), Spencer
patent: 4090222 (1978-05-01), Nakagome et al.
patent: 4245257 (1981-01-01), Yamazaki et al.
patent: 4257069 (1981-03-01), Murayama et al.
patent: 4258392 (1981-03-01), Yamazaki et al.

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