Error correction method and circuit for nonlinear quantization c

Details Error correction method and circuit for nonlinear quantization c Error correction method and circuit for nonlinear quantization c

1990-09-07

1992-04-07

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358164, H04N 969, H04N 5702

Patent

active

051032988

ABSTRACT:
An error correction method and circuit for a nonlinear quantization circuit comparing a test signal which is produced from an error correction table by applying an analog reference signal into a nonlinear circuit with reference data that is defined as an output of the error correction table when the nonlinear circuit has no error, and updating the error correction table by the test signal and the reference data when they disagree. The output of the nonlinear circuit is corrected by using the error correction table. The technique is particularly suitable for nonlinear conversion performed by a gamma correction circuit of a color television camera.

REFERENCES:
patent: 4396938 (1983-08-01), Dischert
patent: 4686562 (1987-08-01), Yamanaka
patent: 4805013 (1989-02-01), Dei et al.
patent: 5012163 (1991-04-01), Alcorn et al.

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