US 5,844,520 AGranted

Surveillance apparatus

AssigneeBritish Aerospace PLC

InventorsJohn R. Guppy, Geoffrey J. Allcock

Life of this patent

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Abstract

In an infra-red surveillance system, a digital memory (1) has a storage location for each of a number of zones, defined by azimuth and elevation co-ordinates, the zones together covering 360.degree. in azimuth and 20.degree., for example, in elevation. In each location there is stored a data word built up from the responses on a zone in successive scans. Each word can be read into a decoder (5) which selects an appropriate video display level in the form of a two-bit word which is then stored in a buffer store (6). A buffer store data controls the display on a cathode ray tube (2). A manually controlled cursor circuit (8) generates a cursor address which results in a cursor display at the corresponding position on the cathode ray tube. The display is in the form of four strips, one above the other, each representing a quadrant of azimuth.

Claims11

Dependent claims

Surveillance apparatus comprising:

a digital memory for storing numbers determined by signals derived from successive scannings of zones having a known spatial relationship in a scene to be surveyed,
means for reading the contents of the digital memory,
visual display apparatus responsive to the numbers read from the memory for presenting a visual display of data derived from the stored numbers, the relative positions of the items of data on the display being governed by the relative positions of the corresponding zones in the scene to be surveyed,
a manually controlled circuit for generating a cursor address, and
means responsive to a correspondence in the output of a display scanning control circuit and to the output of the cursor address generating circuit for providing an indication on the display at the point defined by the cursor address,
said signals being derived from a 360.degree. scan in azimuth and each quadrant of the scanned scene being displayed individually, one above the other on a cathode ray tube.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/548,674Filed 31 Oct 1983
Granted: 1 Dec 1998
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04N 7/18
Television systems: closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
H04N 23/20
Cameras or camera modules comprising electronic image sensors; Control thereof: for generating image signals from infrared radiation only
G01S 7/22
Cathode-ray tube displays or other two dimensional or three-dimensional displays: producing cursor lines and indicia by electronic means
H04N
Pictorial communication