Image processing apparatus

Details Image processing apparatus Image processing apparatus

1992-05-11

1996-07-30

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358445, 358464, H04N 140, H04N 138

Patent

active

055417400

ABSTRACT:
In an image processing apparatus, digital video data is converted into analog video data by a D/A converter. A reference pattern timing-adjusted is generated. The phase relationship between the reference pattern and the analog video data is optimized. The analog video data and the reference pattern are compared by comparing unit. A pulse-width modulated signal output from the comparing unit is detected. The variable output regulator is controlled according to a preset reference value, a quantity of laser light of the output device, or a surface potential of the photoreceptor. Through the control of the regulator, the quantity of bias applied to the reference pattern is optimized at all times, providing a pulse-width modulated image signal with an excellent tone reproduction at all times.

REFERENCES:
patent: 3813486 (1974-05-01), Knowles
patent: 4763199 (1988-08-01), Suzuki
patent: 4782398 (1988-11-01), Mita
patent: 4800442 (1989-01-01), Riseman
patent: 4979032 (1990-12-01), Alessi et al.

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