Method and equipment for processing gray scale facsimile signal

Details Method and equipment for processing gray scale facsimile signal Method and equipment for processing gray scale facsimile signal

1982-01-25

1983-10-11

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358260, H04N 712

Patent

active

044096232

ABSTRACT:
A gray scale facsimile signal is divided into a plurality of block signals, each composed of a plurality of picture element signals. For each block signal are obtained binary space information indicating whether the level of each picture element signal is higher or lower than a threshold value, mean gradation information of the picture element signals having the levels above the threshold value and mean gradation information of the picture element signals having levels below the threshold value. When the difference between the two pieces of mean gradation information representing the gradation of the block signal is smaller than a predetermined value and/or when the number of picture element signals of the levels either higher or lower the threshold value is smaller than a predetermined value, the block signal is represented by one of the two pieces of gradation information and the entire space information of the block signal is set to one value of the binary space information. The space information thus obtained is coded in the same manner as conventional binary facsimile signals and the gradation information is coded in accordance with the run length of successive blocks of the same gradation information. The coded data of the space information and the coded data of the gradation information are combined and delivered out.

REFERENCES:
patent: 4205341 (1980-05-01), Mitsuya et al.

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