Image processing method and apparatus having high tone quality

Details Image processing method and apparatus having high tone quality Image processing method and apparatus having high tone quality

1993-07-30

1995-01-03

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358298, 358300, 346108, 346160, H04N 123, H04N 129, H04N 140, H03K 708, H03K 710

Patent

active

053791266

ABSTRACT:
A multivalued input recording signal is to pulse-width modulation at a time unit shorter the period of a clock signal within the period of the recording signal. Alternatively, the multivalued input recording signal is converted into a plurality of different signals each of whose length of time is shorter than a clock signal within the period of the recording signal, thereby performing pulse-width modulation in accordance with a predetermined weighting. This makes it possible to obtain a highly toned recording signal without raising the frequency of the clock signal. Further, density tone data is generated in dependence upon inputted multivalued pixel data, control is performed using both the irradiation time and emission intensity of a light beam based on the generated density tone data. An image is formed by irradiating a photosensitive body with the controlled light beam.

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