Anomaly surveillance device

• US 5,512,942 A
• Filed: 10/14/1993
• Issued: 04/30/1996
• Est. Priority Date: 10/29/1992
• Status: Expired due to Fees

• Current Assignee: Fujikura Limited
• Original Assignee: FMT Corporation Incorporated, Fujikura Limited
• Inventors: Otsuki, Akira
• Primary Examiner(s): Chin, Tommy P.
• Assistant Examiner(s): Le, Vu
• Application Number:
  US08/135,618
• Time in Patent Office: 929 Days
• Field of Search: 348/143, 348/149, 348/152, 348/155, 348/162, 348/164, 348/169, 348/148, 348/154, 348/157, 348/159-162
• US Class Current: 348/143
• CPC Class Codes: G08B 13/19602 Image analysis to detect motion of the intruder, e.g. by frame subtraction
• CPC Class Codes: G08B 13/19669 Event triggers storage or change of storage policy
• CPC Class Codes: G08B 13/19676 Temporary storage, e.g. cyclic memory, buffer storage on pre-alarm

Abstract

An image signal which is output by a video camera is segregated into image data S2 and synchronous data S3 by the synchronizing segregation circuit 1. At each frame, image data S2 is sequentially stored in the image data multilayer memory 8 which consists of frame memories formed in a ring shape. When an anomalous phenomena which includes this image data S2 is detected by the anomalous phenomena detecting device 2, then for image data S2 and anomalous image data S4, from a time immediately before the occurrence of an anomalous phenomena until the elapse of a prespecified period of time, maintenance and storage in the multilayer memory 8 for image data and in the multilayer memory 7 for extracted anomalous image data by the start/stop control circuit 6. Following this, the image data S2 and the anomalous image data S4 from immediately before the occurrence of an anomalous phenomena until the elapse of a prespecified period of time is forwarded to storage device 10 by the data transfer circuit 9. Based on the thus obtained images from before and after the occurrence of an anomalous phenomena, analysis and resolution of an anomalous phenomena occurring within a surveilled area may be carried out.

Claims

1. An anomaly surveillance device comprising:

camera means for photographing a surveillance area and outputting a shot image as image data;

anomalous phenomena detecting means, connected to said camera means, for detecting an anomalous image from said image data output by said camera means and outputting said anomalous image as anomalous image data;

recording interval setting means, connected to said camera means, for setting a recording interval for said image data output by said camera means;

segment setting means, connected to said recording interval setting means, for setting a number of frames in which said image data output by said camera means and said anomalous image data output by said anomalous phenomena detecting means are to be recorded;

cycling address generating means, connected to said camera means and anomalous phenomena detecting means, for generating a cycling address in accordance with said number of frames selected by said segment setting means;

anomalous image recording means, connected to receive said anomalous image data output by said anomalous phenomena detecting means, consisting of primary frame memories for storing said number of frames set by said segment setting means, said anomalous image recording means sequentially recording said anomalous image data output by said anomalous phenomena detecting means in a frame memory indicated by said cycling address from among said primary frame memories, at each recording interval which is set by said recording interval setting means;

image storing means, connected to receive said image data output by said camera means, consisting of secondary frame memories storing said number of frames set by said segment setting means, said image storing means sequentially storing said image data output by camera means in a frame memory indicated by said cycling address from among said secondary frame memories, at each recording interval set by said recording interval setting means; and

control means for setting a number of valid frames of said primary frame memories in which said anomalous image data is to be recorded, with respect to said number of frames set by said segment setting means, said control means controlling an initiation and termination of storing of said anomalous image data by said anomalous image data recording means, and initiation and termination of storing of image data by said image storing means, in accordance with said number of valid frames, when an anomalous image is detected by said anomalous image detecting means.

2. An anomaly surveillance device according to claim 1, wherein said anomalous phenomena detecting means comprises:

reference image generating means for inputting sequentially supplied images output by said camera means at pre-specified time intervals and generating a reference image by averaging the inputted images; and

subtracting means for subtracting the reference image from the image output by said camera means.

3. An anomaly surveillance device according to claim 1, wherein said recording interval, said number of frames, and said number of valid frames are set in accordance with a speed of movement of an anomalous phenomenon within said surveillance area such that said recording interval is set to be small and said number of frames and said number of valid frames are set to be large in accordance with a high speed anomalous phenomenon, while said recording interval is set to be large and said number of frames and said number of valid frames are set to be small in accordance with a low speed anomalous phenomenon.

4. An anomaly surveillance device according to claim 1, wherein said recording interval is an integer multiple of a time interval in which image data of one frame is output.

5. An anomaly surveillance device according to claim 1, wherein said anomalous image recording means and said image storing means comprise a plurality of frame memories, a number of which are set by said segment setting means and store image data.

6. An anomaly surveillance device according to claim 1, wherein said camera means is responsive to any one of visible light, invisible light, and laser beams of a specified wavelength.