Total raster error correction apparatus and method for the autom

Details Total raster error correction apparatus and method for the autom Total raster error correction apparatus and method for the autom

1980-02-25

1981-08-18

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 41, 358163, 358164, 358185, 358210, 358 51, H04N 904, H04N 962

Patent

active

042850045

ABSTRACT:
A total raster error measurement and correction circuitry, using digital memory means in the camera head for the storage of correction data, corrects spatial scan, shading, etc., errors in a television picture in two dimensions. The basic spatial error correction circuit effectively synthesizes horizontal rate waveforms on a number of discrete lines of the vertical scan. On all scanned lines between discrete lines, a linear approximation between the two discrete waveforms is made to form a vertically continuous waveform. Black and white shading errors are measured by comparing the black and white video levels against respective selected black and white D.C. levels with and without a cap on the camera lens. Gamma correction is provided by comparing the peak black and white levels to derive any gray level errors. The total raster error correction data are retrieved from memory and are applied to given image pickup sensors and corresponding video processing circuits in the camera head system during real time operation.

REFERENCES:
patent: 4158208 (1979-06-01), Dischert

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