Digital AGC circuit for image processing

Details Digital AGC circuit for image processing Digital AGC circuit for image processing

1995-01-04

1997-07-22

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

H03M 118

Patent

active

056507844

ABSTRACT:
Before actually reading a document image, white reference data corresponding to a pure white document image is found in an AGC processing unit 32, and is set in a register 32a. In a CPU 33, data corresponding to the white reference data set in the register 32a is produced. The produced data is set in a register 32b. The set data is applied to a D/A converting unit 34, where the data is converted into analog data, after which the analog data is applied as a low reference voltage V.sub.ref L to an A/D converting unit 31. As a result, the maximum amplitude range of the analog image data becomes approximately the same as the input voltage range. Accordingly, AGC processing can be realized in a digital manner, thereby to make it possible to simplify the circuit arrangement, as compared with the conventional circuit arrangement, and to easily make fine adjustment.

REFERENCES:
patent: 4540974 (1985-09-01), Schanne et al.

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