Video printer and printing method

Details Video printer and printing method Video printer and printing method

1996-04-30

1998-06-02

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358428, 358429, 358443, 358448, 358479, 348220, 348395, 348402, 348405, G06F 1500, H04N 141, H04N 104, H04N 5225

Patent

active

057613931

ABSTRACT:
A direct color thermal printer is used with color thermosensitive recording sheet (23), and prints a pixel (i, j) to it in accordance with 8-bit digital data g(i, j), namely brightness data (Y) and chrominance data (R-Y, B-Y). The digital data is compensated by use of a second-order differential operator. An integer 128 is added to the digital data g'(i, j) being compensated. A sum of 128 and the compensated digital data is limited to a range of nine bits, so as to heighten halftone of the pixel to be printed.

REFERENCES:
patent: 4170785 (1979-10-01), Yoshida et al.
patent: 5294974 (1994-03-01), Naimpally et al.
patent: 5325125 (1994-06-01), Naimpally et al.
patent: 5452403 (1995-09-01), Miller
patent: 5499060 (1996-03-01), Gove et al.

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