An image processing apparatus (40) according to the present disclosure includes a display unit (42) and a control unit (41) configured to control the display unit (42) to display a sensing data image indicating sensing data of an optical fiber and a camera image of a camera (50) which photographs an area in which a predetermined event is detected by the sensing data.

A computer-implemented event statistic generation for intrusion detection comprises processing a plurality of return signals from a coherent optical time-domain reflectometer into time-domain signals for each of a plurality of sensor bins, the plurality of return signals corresponding to a plurality of stimulation pulses injected into an optical sensor fiber during a time period. For each sensor bin, transforming the respective time-domain signal into a corresponding frequency-domain signal, calculating, from the respective frequency-domain signal, a first signal power area of a first frequency band expected to contain system noise and a second signal power area of a second frequency band expected to contain any energy related to at least a first event; and generating an event statistic proportional to the ratio of the second signal power area to the first signal power area at least in part by dividing the second signal power area by the first signal power area.

In certain embodiments, real-time playback modification for activity event playback may be facilitated. In some embodiments, an event list portion and an event playback portion may be provided on a user interface, where the event playback portion is configured to present a playback of events on a location map in accordance with event detection times and a set of event layers for the event playback. While the event playback is occurring, a user selection of events may be obtained via the event list portion of the user interface. While the event playback is occurring, a set of layers for the event playback may be modified based on the user selection. In some embodiments, based on the modification to the set of layers, event layers may be overlaid onto the location map of the event playback portion of the user interface.

A monitoring system according to the present disclosure includes an optical fiber (10) laid in a monitoring area; an authenticating unit (20) configured to authenticate a person or a vehicle passing through a gate (G) for entering the monitoring area; an optical fiber sensing unit (31) configured to acquire, based on an optical signal received from the optical fiber (10), a parameter having a unique pattern corresponding to the pattern of action of the authenticated person or vehicle; and an analyzing unit (32) configured to identify the pattern of action of the authenticated person or vehicle based on the unique pattern of the parameter.

A monitoring system according to the present disclosure includes an optical fiber (10) laid in a monitoring area; an authenticating unit (20) configured to authenticate a person or a vehicle passing through a gate (G) for entering the monitoring area; an optical fiber sensing unit (31) configured to acquire, based on an optical signal received from the optical fiber (10), a parameter having a unique pattern corresponding to the pattern of action of the authenticated person or vehicle; and an analyzing unit (32) configured to identify the pattern of action of the authenticated person or vehicle based on the unique pattern of the parameter.

The invention relates to a system and method for detecting vibrations on the periphery of an optical fibre, which is divided into five subsystems that are connected together. First, a light-source subsystem (6) generates light, which is transmitted through an optical fibre subsystem (2). Then, speckle interference patterns generated in the optical fibre are read using a CMOS micro camera subsystem (5). Subsequently, the information is analysed by a processing subsystem (7), producing an alarm signal that is notified to the outside by means of a communications subsystem (1).

In an optical fiber monitoring system which detects physical disturbance or other parameters such as temperature or strain of a fiber where a monitor signal is transmitted along the optical fiber and analyzed to detect changes which are indicative of an event, a method is provided for periodically checking proper operation of the optical fiber monitoring system. A fiber disturbance actuator periodically causes a pattern of disturbances of a portion of the fiber at a predetermined location thereon where the disturbance is characteristic of the event to be monitored. The monitor signal is analyzed to detect the pattern of changes and in the event that expected changes are not detected, a warning is issued that the intrusion detection system is not properly operating.

In an optical fiber monitoring system which detects physical disturbance or other parameters such as temperature or strain of a fiber where a monitor signal is transmitted along the optical fiber and analyzed to detect changes which are indicative of an event, a method is provided for periodically checking proper operation of the optical fiber monitoring system. A fiber disturbance actuator periodically causes a pattern of disturbances of a portion of the fiber at a predetermined location thereon where the disturbance is characteristic of the event to be monitored. The monitor signal is analyzed to detect the pattern of changes and in the event that expected changes are not detected, a warning is issued that the intrusion detection system is not properly operating.

In order to provide a protection monitoring system that comprises a warning function to which it is not easy to become habituated, and that can call attention at the time when abnormal vibration is sensed even without a cable undergoing failure, the protection monitoring system according to an embodiment of the present invention comprises an optical fiber provided along a long infrastructure element installed in water or on a seabed, an interrogator for acquiring environment information at positions along the long infrastructure element using the optical fiber, an abnormal event detection means for detecting an abnormal event around the positions when the environment information acquired at the positions satisfies an abnormality pattern provided in advance, and a notification means for issuing a notice to a ship positioned in a prescribed range from a position in which the abnormal event is detected.

An optical fiber sensing system according to the present disclosure includes: a cable (20) including optical fibers; a reception unit (31) configured to receive, from at least one optical fiber included in the cable (20), an optical signal on which a vibration detected in each of a plurality of locations on the cable (20) is superimposed; and an action specifying unit (32) configured to specify, based on the optical signal, a location on the cable (20) in which the vibration has been detected and specify an action of a target to be monitored which has caused the vibration, in which the action specifying unit (32) specifies a detection pattern that is used to specify the action of the target to be monitored depending on the environment of the location on the cable (20) in which the vibration has been detected.