Picture signal quantizing circuit

Details Picture signal quantizing circuit Picture signal quantizing circuit

1984-02-13

1986-03-25

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358284, 358282, 340347AD, 382 53, H04N 140

Patent

active

045787158

ABSTRACT:
A picture signal quantizing circuit for quantizing with respect to multiple levels an analog picture signal read from a document by converting it into a digital picture signal which has a plurality of bits. An AD converter is installed in the circuit which is supplied with reference voltages corresponding to the highest and lowest levels for quantization and prepared by dividing a document background level voltage, multi-level quantizing the analog picture signal within the range defined by the two levels. The AD converter includes a circuit for accentuating half-tone of the analog picture signal to enhance the reproducibility thereof.

REFERENCES:
patent: 4216465 (1980-08-01), Huelsman et al.
patent: 4496935 (1985-01-01), Inoue et al.

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