Method and apparatus for expanding two-dimensional compressional

Details Method and apparatus for expanding two-dimensional compressional Method and apparatus for expanding two-dimensional compressional

1987-11-19

1989-08-22

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

3582612, 375122, H04N 141

Patent

active

048601144

ABSTRACT:
In an MR code expanding apparatus, a reference line processing circuit shifts reference line data bit-serially and at the same time, searches for a color changing point of the reference line data at seven successive picture element positions in parallel. An output data producing circuit produces, bit-serially and in synchronism with the shifting of the reference line data, expanded line data of each picture element corresponding to each reference line picture element arriving at the center of these seven picture element positions. A code analyzing circuit supplies the reference line processing circuit with a signal which designates one of these seven picture element positions at which the color changing point is to be detected. A signal which represents detection of the color changing point at the designated picture element position is used for controlling the state transition of the expanding operation.

REFERENCES:
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patent: 4115815 (1978-09-01), Nakagome et al.
patent: 4546342 (1985-10-01), Weaver
patent: 4568983 (1986-02-01), Bobick
patent: 4626921 (1986-12-01), Ohtani et al.
patent: 4743973 (1988-05-01), Endo
patent: 4750043 (1988-06-01), Hisada et al.
patent: 4760459 (1988-07-01), Sato

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