Apparatus and a method for automatically centering a video zoom

Details Apparatus and a method for automatically centering a video zoom Apparatus and a method for automatically centering a video zoom

1989-04-20

1991-02-05

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 22, 358451, 382 47, 340731, H04N 5262

Patent

active

049910221

ABSTRACT:
A video processing system includes apparatus for panning and magnifying portions of a source image stored in memory. Viewer control circuitry generates center coordinates of the portion of the image to be displayed and also a magnification factor. Further circuitry, responsive to the center coordinates and the magnification factor, generates starting addresses for reading the appropriate portion of the source image from memory. The system monitors the relative values of the center coordinates and the magnification factor to preclude blanking intervals of the source image from being displayed.

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