Surveillance apparatus
First Claim
1. 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, andmeans 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°
scan in azimuth and each quadrant of the scanned scene being displayed individually, one above the other on a cathode ray tube.
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Accused Products
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° in azimuth and 20°, 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.
27 Citations
11 Claims
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1. Surveillance apparatus comprising:
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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°
scan in azimuth and each quadrant of the scanned scene being displayed individually, one above the other on a cathode ray tube. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification