Video camera with improved shading correction using clipped para

Details Video camera with improved shading correction using clipped para Video camera with improved shading correction using clipped para

1992-11-09

1994-08-30

Groody, James J.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348615, H04N 5243, H04N 516

Patent

active

053433025

ABSTRACT:
A video camera includes a shading correction circuit in which a parabolic wave signal is generated and the level thereof is adjusted in accordance with zoom and iris settings of the camera's optical system. After adjustment, the parabolic wave signal is clipped in accordance with a reference level and the clipped parabolic wave signal is used for correcting the shading of the camera's image signal. The clipping of the parabolic correction signal allows for more accurate shading correction.

REFERENCES:
patent: 3588338 (1971-06-01), Dischert
patent: 4562459 (1985-12-01), Sokei
patent: 4618892 (1986-10-01), Kawaguchi
patent: 4731652 (1988-03-01), Yamanaka
patent: 5157497 (1992-10-01), Topper
patent: 5202762 (1993-04-01), Fellinger

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