Image transmitting apparatus having improved coding of multi-val

Details Image transmitting apparatus having improved coding of multi-val Image transmitting apparatus having improved coding of multi-val

1993-06-08

1994-06-07

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358408, 358426, H04N 140

Patent

active

053194713

ABSTRACT:
An image transmitting apparatus for digitizing a still-picture television signal, a manuscript image signal or the like and transmitting the digitized signal over a line is adapted to read an analog image signal stored in video memory such as a video disk, convert the read analog image signal into a digitized multi-valued signal and store the multi-valued image signal in an image memory. On the basis of paper size on which printing is to be performed by an apparatus, such as a facsimile machine, on the receiving side, the number of pixels constituting the multi-valued image signal stored in the image memory and an ensuing binary coding method, a ratio is obtained at which the multi-valued image signal stored in the image memory is to be expanded or compressed, and the multi-valued image signal is expanded or compressed based on this ratio. The multi-valued image signal thus expanded or compressed is binary coded as by a dither method, and the binary-coded image data are transmitted to the facsimile machine on the receiving side through a line.

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patent: 5006937 (1991-04-01), Nonoshita et al.

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