Picture image signal compensation device

Details Picture image signal compensation device Picture image signal compensation device

1987-03-27

1989-05-09

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

35821327, 358284, H04N 514, H04N 5235

Patent

active

048293792

ABSTRACT:
A picture image signal compensation device for devices such as image scanner, facsimile and etc. comprises a whiteboard provided before manuscript in which an average value of white level signals of said whiteboard with unusually low values eliminated in obtaining the average value or an average value of white level signals of said whiteboard with an average value by the plural scannings is used as a standard datum for each of picture elements for picture image signal compensation.

REFERENCES:
patent: 4523229 (1985-06-01), Kanmoto
patent: 4633314 (1986-12-01), Karata et al.

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