Characteristic extracting apparatus

Details Characteristic extracting apparatus Characteristic extracting apparatus

1983-02-14

1986-02-11

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358107, 358199, 382 48, H04N 514

Patent

active

045701814

ABSTRACT:
A window signal generating device for use in a video scanning apparatus, for producing a window signal during selected periods when a video scanning signal is in an observation region window of interest to facilitate scanning only from objects which appear in selectively defined windows of a viewing area, comprising, an addressable memory for storing information indicating the starting and ending boundaries of each window of interest in a viewing area, a memory address driver for addressing locations in memory containing the stored boundary information for a horizontal scan line in response to a horizontal scan line signal, a counter for receiving horizontal and vertical synchronous signals and for providing a video scanning position output signal, and a comparator circuit for receiving the video scanning position output signal from the counter and the starting and ending boundary data from the memory, and for producing a window output signal when the video scanning position is within the boundaries of a window. A scan data memory receives and stores data from objects within the windows.

REFERENCES:
patent: 4242662 (1980-12-01), Tsujiyama et al.
patent: 4398256 (1983-08-01), Nussmeier et al.
patent: 4400728 (1983-08-01), Long
patent: 4450579 (1984-05-01), Nakashima et al.

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