Procedure and device for the automatic correction of skew,...

Details Procedure and device for the automatic correction of skew,... Procedure and device for the automatic correction of skew,...

H - Electricity

04

N

H04N 9/093 (2006.01) H04N 3/23 (2006.01) H04N 3/233 (2006.01) H04N 5/217 (2006.01)

Patent

CA 2047687

A B S T R A C T Procedure and Device for the Automatic Correction of Skew, of Color Superimposition, and of Image Uniformity for Television Cameras The device for implementation of the invention procedure comprises, first, a processor (2) connected by a data bus (12) to a correction memory (3), a measuring circuit (9), and a digital- to-analog converter (4), and second, to an adder circuit connected to the output of the digital-to-analog converter (45) and to the output of the scanning circuit of the camera so as to add to the sawtooth signal supplied by the camera the correction values furnished by the correction memory in synchrony with the scanning of the camera. The correction values result from an evaluation of the position error of the centers of the patterns of an optical grid as restored by the camera and of their equivalents in an electronic grid. Intermediate correction values are computed for each pattern by interpolation of the position errors of the centers of the patterns, using a third- order interpolation polynomial. Application: High-definition television.

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