Method and system for detecting a motionless body in a pool

Details Method and system for detecting a motionless body in a pool Method and system for detecting a motionless body in a pool

1989-11-13

1991-08-27

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340552, 340553, 340554, 367 93, 367 94, G08B 1316, G08B 1318, G08B 2100

Patent

active

050437054

ABSTRACT:
At least a bottom layer of a swimming pool is continuously scanned at known time intervals in order to generate successive frames of image data containing the contours of all objects whose size exceeds a predetermined size threshold. Successive frames of image data are compared in order to identify those contours which are common to successive frames and whose displacement from one frame to the next is less than a predetermined threshold. This procedure is repeated over successive frames and, since the time interval between one frame and the next is known, a contour which remains substantially motionless for longer than a predetermined time interval may be detected. Such a contour represents a motionless body, on detection of which an alarm is activated. An apparatus according to the invention includes a sonar detector located at the bottom of the swimming pool for scanning the bottom layer thereof so as to produce image data which is subsequently processed by image-processing means. The invention also envisages scanning an upper layer of the swimming pool in order to detect a motionless body which is floating.

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