H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/42
H04N 9/04 (2006.01) H01J 29/72 (2006.01) H04N 9/093 (2006.01) H04N 17/00 (2006.01)
Patent
CA 1150825
ID-2575 ABSTRACT OF THE DISCLOSURE 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 dimen- sions. 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.
371597
Morrison Eric F.
Zank Anthony E.
Ampex Corporation
Macrae & Co.
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