Method of correcting white shading for video cameras and apparat

Details Method of correcting white shading for video cameras and apparat Method of correcting white shading for video cameras and apparat

1996-02-16

1998-10-06

Faile, Andrew I.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348251, 348347, H04N 973

Patent

active

058185232

ABSTRACT:
White shading of an image signal is corrected by a white shading correction system which requires a small amount of memory. Rather than storing correction signals for an entire image frame for each possible condition of zoom lens position and iris opening degree, the present system stores correction signals for a single frame corresponding to a single condition where the zoom lens is at a medium position and the iris is at a medium opening degree. The present system also generates a set of correction factors corresponding to each possible condition of zoom lens position and iris opening degree. When the conditions of zoom lens position and iris opening change from their medium values, the correction signals used for correcting the image data picked up by the camera are modified by the appropriate correcting factor prior to performing correction of the picked-up image data. Additionally, memory space is conserved by decimating the correction signals before storing them in memory and interpolating between the decimated correction signal before using them to perform corrections.

REFERENCES:
patent: 4878128 (1989-10-01), Yasumura et al.
patent: 4908874 (1990-03-01), Gabriel
patent: 5047861 (1991-09-01), Houchin et al.
patent: 5157497 (1992-10-01), Topper et al.
patent: 5644409 (1997-07-01), Irie et al.

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