JP2015104028A - Monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that, in a conventional monitoring system, since data are recorded while being compressed, recording image quality until abnormality occurrence is low and sufficient post-verification utilizing a monitoring video image cannot be performed.SOLUTION: A monitoring system includes: a sensor 107 for detecting physical values such as a temperature, pressure and the like of a monitoring object 101 such as a plant; an abnormality detection device 106 for capturing a sign of abnormality occurrence on the basis of detection values from the sensor 107; a monitoring camera 102 that images the monitoring object 101 and recording the video image; and a bulk storage 104 for inputting and storing the video image recorded by the monitoring camera 102 via a video compression device 105 capable of changing a frame rate. The frame rate is controlled by the video compression device 105 in accordance with a possibility of abnormality occurrence captured by the abnormality detection device 106, and the monitoring camera 102 includes a function for recording the video image of the monitoring object 101 while enlarging and reducing the video image.

Description

  The present invention maintains an amount of information that can be used for analysis of the cause of abnormality in cooperation with the abnormality detection device while efficiently recording video and reducing storage capacity in a monitoring system such as a plant. It is related to the method to do.

Conventionally, the storage capacity reduction in the surveillance camera has been performed by increasing the bit rate or the compression rate with the video abnormality as a trigger for the video up to the occurrence of the abnormality (see, for example, Patent Document 1).
For this reason, it was not possible to record a sufficient image for verifying the cause of the occurrence of the abnormality in the normal state or immediately before the occurrence of the abnormality.

JP 2002-262272 A

  In the conventional recording method, since the compression rate is increased, the recording image quality until the occurrence of abnormality is low, and there is a problem that sufficient post-verification cannot be performed by using the monitoring video.

  The present invention has been made in order to solve the above-described problems. The amount of information that can be used for analysis of the cause of the abnormality is reduced while efficiently recording video and reducing the storage capacity. The purpose is to maintain.

  The present invention includes a sensor that detects a physical quantity related to a monitoring target, an abnormality detection device that captures a sign of occurrence of an abnormality based on a detection value from the sensor, a monitoring camera that images the monitoring target and records the video, Storage means for inputting and storing the video recorded by the surveillance camera via a video compression device capable of changing the frame rate, and depending on the possibility of the occurrence of an abnormality captured by the abnormality detection device, the video compression device In addition to controlling the frame rate, the monitoring camera has a function of recording an enlarged or reduced image of the monitoring target.

  According to the present invention, it is possible to maintain an amount of information that can be used for analysis of the cause of an abnormality while efficiently recording video and reducing storage capacity.

BRIEF DESCRIPTION OF THE DRAWINGS It is a system block diagram which shows the structure in Embodiment 1 which concerns on this invention. It is a control flowchart which shows the operation | movement in Embodiment 1 which concerns on this invention. It is a system block diagram which shows an example of a structure in Embodiment 2 which concerns on this invention. It is a system block diagram which shows the other structural example in Embodiment 2 which concerns on this invention. It is a timing chart explaining the operation | movement in Embodiment 3 which concerns on this invention.

Embodiment 1 FIG.
A first embodiment according to the present invention will be described with reference to FIGS. FIG. 1 is a system configuration diagram showing the configuration in the first embodiment. FIG. 2 is a control flowchart showing the operation in the first embodiment.
A monitoring camera 102 is installed for a monitoring target 101 such as a plant. The monitoring camera 102 includes a memory unit including a small-capacity memory 103 and has a function of recording uncompressed video for a short time. The monitoring camera 102 can cyclically record uncompressed video in the small-capacity memory 103, and the recorded video can be output to the outside.

  In addition, the monitoring camera 102 has a function of enlarging and recording the monitoring target 101 in accordance with an instruction of a shooting position and an enlargement ratio by external signal input. As a result, it is possible to acquire an image in which an abnormal part useful for analysis at the time of occurrence of the abnormality is enlarged.

This surveillance camera system includes a storage unit including a large-capacity storage 104, and has a function of recording compressed video for a long time.
It is possible to automatically record an uncompressed video from the memory 103 by inputting an external signal for a short time after video recording.

  This surveillance camera system includes a video compression device 105 for storing data in the memory 103 in the mass storage 104 at a reduced frame rate. The video compression apparatus 105 has a function of changing the frame rate of video in a stepwise manner by inputting an external signal. As a result, the normal recording capacity can be kept low.

This surveillance camera system has an abnormality detection device 106 that detects signs of abnormality from the input data of the sensor 107, and records a video at an increased frame rate according to the possibility of the occurrence of an abnormality before the occurrence of the abnormality. The video compression apparatus 106 is instructed. Anomaly detection and control of the frame rate and enlargement ratio are performed according to the flowchart shown in FIG. As a result, it is possible to acquire an image with high time resolution useful for analysis when an abnormality occurs.
As the data from the sensor 107, for example, physical quantities such as temperature and pressure of the monitoring target 101 are used.

As shown in FIG. 2, whether the input to the abnormality detection device 106 from the sensor 107 (any of the physical quantities including the temperature and pressure of the monitoring target 101) exceeded the first threshold value (threshold value 1) in step 201. It is determined whether or not.
If the first threshold value (threshold value 1) is not exceeded, the frame rate is set to a lower value in step 202, and control is performed to zoom out from the monitoring target 101 in step 203.

  If the first threshold value (threshold value 1) has been exceeded, it is determined in step 204 whether the second threshold value (threshold value 2) has been exceeded. Here, the second threshold value (threshold value 2) is set to a value higher than the first threshold value (threshold value 1). If the second threshold value (threshold value 2) is not exceeded, the frame rate is set to medium at step 205, and control is performed to zoom in around the monitored object 101 at step 206.

  If the second threshold value (threshold value 2) is exceeded in step 204, the frame rate is set to high in step 207, and control is performed to zoom in on the monitoring target 101 in step 208.

  The abnormality detection device 106 has a function of issuing an instruction to enlarge and record a monitoring target that may cause an abnormality in the monitoring camera 102 in accordance with the possibility of the occurrence of the abnormality. The relationship between the installation location of the sensor 107 and the corresponding image enlargement position needs to be set in advance.

Embodiment 2. FIG.
A second embodiment according to the present invention will be described with reference to FIGS. FIG. 3 is a system configuration diagram showing an example of the configuration in the second embodiment. FIG. 4 is a system configuration diagram showing another configuration example according to the second embodiment.
In the first embodiment, when the monitoring target 101 in which an abnormality may occur is enlarged and displayed, an area that does not appear in the monitoring camera 102 is created. Therefore, the monitoring camera system of the second embodiment always monitors. It has an arrangement of surveillance cameras that can record video of the entire area. Also, the abnormality detection device 106 controls the monitoring camera so that the video of the entire monitoring area can always be recorded by instructing the other camera 108 to reduce the area that is no longer reflected in the camera due to the enlargement of the monitoring target 101 by detecting the abnormality sign. It has a function to do.

FIG. 3 shows a system configuration including two surveillance cameras, the first surveillance camera 102 and the second surveillance camera 108, as the surveillance cameras. The first surveillance camera 102 has the frame rate described in the first embodiment. The second surveillance camera 108 has a memory 109, a reduction function, and a function that can record an image of the entire surveillance area.
In the above description, the second monitoring camera has a reduction function. However, both the first monitoring camera 102 and the second monitoring camera 108 may have an enlargement / reduction function. .

  Further, FIG. 3 shows the case where there is one monitoring target, but the present invention also applies when a plurality of monitoring targets are provided as in the first monitoring target 101 and the second monitoring target 110 as shown in FIG. Is applicable. The second monitoring target 110 includes a sensor 111.

Embodiment 3 FIG.
A third embodiment according to the present invention will be described with reference to FIG. FIG. 5 is a timing chart for explaining the operation in the third embodiment.
The video compression apparatus 105 has a function of alternately recording overlapping areas with different monitoring cameras when the frame rate during normal times is low.
The operation of this function is performed according to the time series shown in FIG. FIG. 5 is an example in which four surveillance cameras 1 to 4 are provided, and the surveillance camera 1 and the surveillance camera 2 partially overlap in shooting positions. The monitoring camera 1 and the monitoring camera 2 are controlled so that the recording times are alternately shifted.
Similarly, the relationship between the monitoring camera 2 and the monitoring camera 3 and the relationship between the monitoring camera 3 and the monitoring camera 4 are controlled such that the shooting positions partially overlap and the recording time is shifted alternately.

  It should be noted that within the scope of the present invention, a part or all of each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted.

  101 monitoring target, 102 monitoring camera, 103 small-capacity memory (memory means), 104 large-capacity storage (storage means), 105 video compression device, 106 anomaly detection device, 107 sensor, 108 monitoring camera, 109 memory, 110 monitoring target, 111 sensor.

Claims (5)

  A sensor that detects a physical quantity related to a monitoring target, an abnormality detection device that captures a sign of occurrence of an abnormality based on a detection value from the sensor, a monitoring camera that images the monitoring target and records the video, and recording by the monitoring camera Storage means for inputting and storing the recorded video through a video compression device capable of changing the frame rate, and the frame rate is set by the video compression device according to the possibility of occurrence of an abnormality detected by the abnormality detection device. The monitoring system, wherein the monitoring camera has a function of recording the video to be monitored in an enlarged or reduced manner while controlling.   2. The monitoring camera according to claim 1, wherein the monitoring camera includes a memory unit that cyclically records uncompressed video, and has a function of expanding and recording the monitoring target by inputting an external signal. Monitoring system.   The abnormality detection device has a function of determining whether a detection value from the sensor exceeds a first threshold or exceeds a second threshold larger than the first threshold, and is smaller than the first threshold Sets the frame rate to low and controls to zoom out from the monitoring target. If the first threshold is exceeded but does not exceed the second threshold, the frame rate is set to medium and the monitoring target is The control is performed to zoom in on the periphery, and when the second threshold value is exceeded, the frame rate is set to be high, and control is performed to zoom in on the monitoring target. The monitoring system described in.   A plurality of the monitoring cameras are provided, and the plurality of monitoring cameras are operated in cooperation with each other, and at least one of the plurality of monitoring cameras is capable of recording an image of the entire monitoring area, and has a monitoring recording frame rate. 4. The monitoring system according to claim 2, further comprising a camera arrangement that can reduce a storage capacity for video recording while maintaining a recording time of a monitoring target even when the recording time is low.   A plurality of the monitoring cameras are provided, and the plurality of monitoring cameras are arranged so that the shooting positions are partially overlapped, and the video compression device is an overlapping area when the frame rate at normal times is low The monitoring system according to claim 2, wherein the monitoring system has a function of alternately recording images with different monitoring cameras.

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