JP2007329636A - Monitor system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To record image information corresponding to the movement of a moving body while decreasing the number of sensors provided in addition to a monitor camera and to make the reliability of the monitor system higher than before. <P>SOLUTION: The monitor system comprises a plurality of monitor cameras 11, 12, 13, ..., 1z, a recording means 70 of individually recording image information imaged by the respective monitor cameras, motion detecting means 31, 32, 33, ..., 3z of detecting the moving body included in the image information imaged by the respective monitor camera, and a frequency varying means 60 of making the frequency at which the image information is recorded by the recording means 70 higher for monitor cameras having detected the moving body by their motion detecting means than for monitor cameras which have not detected the moving body. Thus, the monitor cameras having detected the moving body are made higher in recording frequency, so that recording corresponding to movement of the moving body can securely be performed. In addition to the monitor cameras 11, 12, 13, ..., 1z, no sensor needs to be provided, so that the reliability of the system can be made higher than before. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a monitoring system capable of recording image information captured by a plurality of monitoring cameras.

Conventionally, for example, when a moving body (especially a suspicious person) is imaged with a surveillance camera and image information is recorded, the moving speed of the moving body is measured using a pair of infrared detection elements or a pair of Doppler sensors. An example of a technique relating to a video surveillance system is disclosed in which the image recording interval is shortened when it is determined that the measured moving speed is fast, and conversely the image recording interval is lengthened when it is determined that the moving speed is slow ( For example, see Patent Document 1).
Japanese Patent Laid-Open No. 11-234653

  However, although the speed sensor of Patent Document 1 can measure the moving speed only after receiving signals from the pair of sensor elements, it cannot measure the moving speed when no signal is sent from at least one of the sensor elements. If a signal is not sent from one sensor element for some reason (for example, failure), the image recording interval cannot be changed, and as a result, recording corresponding to the movement of the moving object cannot be performed. Therefore, the conventional technology has a problem that the reliability of the system is low.

  The present invention has been made in view of the above points, and can reduce the number of sensors provided in addition to the monitoring camera to perform recording corresponding to the movement of the moving object, and enhance the reliability of the monitoring system as compared with the prior art. The purpose is to provide a monitoring system.

(1) Means for solving the problem (hereinafter, simply referred to as “solution means”) 1 includes a plurality of monitoring cameras and recording means for individually recording image information captured by the plurality of monitoring cameras. A motion detection unit that detects a moving object included in image information captured by each of the plurality of monitoring cameras, and a monitoring camera that detects the moving object by the motion detection unit and that does not detect the moving object. The gist of the invention is to have frequency changing means for increasing the frequency of recording image information in the recording means rather than the camera.

  Note that the form of “increasing the frequency of recording image information” is not limited to a form in which the recording rate for recording image information is increased (sampling time is shortened), but an aspect in which the image quality (resolution) at the time of imaging is increased. In addition, in the configuration in which image information is recorded by sequentially switching the monitoring cameras, one mode or a combination of a plurality of modes among the modes in which the switching frequency is increased is applicable.

  According to the solution 1, since the recording frequency (that is, the frequency of recording image information in the recording means) is increased for the monitoring camera that has detected the moving object by the motion detecting means, it is possible to reliably perform the recording corresponding to the movement of the moving object. it can. Further, since it is not necessary to provide a sensor in addition to the surveillance camera, the reliability of the system can be improved as compared with the conventional system.

(2) The solving means 2 is a monitoring system comprising a plurality of monitoring cameras and a recording means for individually recording image information captured by the plurality of monitoring cameras, each of which is captured by the plurality of monitoring cameras. Detecting means for detecting a moving object included in the image information, and a frequency changing means for increasing the frequency of recording image information in the recording means for a monitoring camera arranged in the vicinity of the monitoring camera detecting the moving object by the motion detection means It is summarized as having.

  According to the solution means 2, the surveillance camera arranged in the vicinity of the surveillance camera that has detected the moving object by the motion detection means can reliably perform recording corresponding to the movement of the moving object.

(3) The solving means 3 is the monitoring system described in the solving means 1 or 2, and for a monitoring camera that detects a moving object by the motion detecting means, a vector calculating means for obtaining a moving vector of the moving object included in the captured image information. And a predicting means for storing a plurality of surveillance cameras in advance and predicting a surveillance camera that may image a moving object next based on the direction of the movement vector obtained by the vector calculation means. Then, the gist of the frequency changing means is to increase the frequency of recording the image information in the recording means for the monitoring camera predicted by the prediction means.

  According to the solution means 3, based on the direction of the movement vector obtained by the vector calculation means (that is, the moving direction of the moving object), the prediction means predicts the monitoring camera arranged in that direction. Even if it becomes impossible to image a moving object with the current monitoring camera, the recording frequency of the predicted monitoring camera is increased, so that the next monitoring camera can accurately capture the image. As described above, if the recording frequency is increased in advance for the monitoring cameras along the moving direction of the moving object, the moving object can be imaged in cooperation with the monitoring cameras.

(4) The solving means 4 is a monitoring system including a plurality of monitoring cameras and a recording means for individually recording image information captured by the plurality of monitoring cameras, and is provided for each monitoring camera. A moving object detecting sensor for detecting a moving object, a motion detecting means for detecting a moving object included in image information captured by each of the plurality of monitoring cameras, a moving object detected by the moving object detecting sensor, and then the motion detecting means. The gist of the invention is to have frequency changing means for increasing the frequency of recording image information in the recording means by the monitoring camera that detects the moving object as the period until the moving object is detected becomes shorter.

  According to the solution means 4, the recording frequency is increased as the period from the detection of the moving object by the moving object detection sensor to the detection of the moving object by the motion detection means is shortened (in other words, the moving speed of the moving object is increased). Recording corresponding to the movement of the moving object can be reliably performed. Further, although it is necessary to provide a moving object detection sensor in addition to the surveillance camera, it is not necessary to provide a pair as in the conventional case, and only one is required, so that the reliability of the system can be improved as compared with the conventional case.

(5) The solution means 5 is the monitoring system described in the solution means 4, and the motion detection means divides a screen displayed as image information into a plurality of areas, and the moving object is the first in the plurality of areas. The gist of the invention is to increase the frequency of recording the image information on the recording means in accordance with the area where the image is detected.

  When a moving object is imaged by a monitoring camera with a constant recording rate, the position where it first appears on the screen changes as the moving speed of the moving object increases. For example, when the moving object moves from the upper right to the lower left of the screen, the position where the moving object can be recorded first becomes closer to the lower left of the screen as the moving speed of the moving object increases. The solution 5 divides the screen into a plurality of areas, estimates whether the moving speed of the moving body is fast or slow according to the area where the moving body is first detected, and increases the recording frequency. Therefore, after a moving object is detected for the first time, recording corresponding to the movement of the moving object can be reliably performed.

(6) The solving means 6 is the monitoring system according to any one of the solving means 1 to 5, and the moving vector of the moving object included in the captured image information for the monitoring camera that detects the moving object by the motion detecting means. The frequency change means has a gist of increasing the frequency of recording the image information in the recording means in accordance with the magnitude of the movement vector obtained by the vector calculation means.

  According to the solution means 6, since the recording frequency is increased according to the magnitude of the movement vector obtained by the vector calculation means (that is, the moving speed of the moving object), the recording corresponding to the movement of the moving object can be performed more reliably.

  According to the present invention, since the recording frequency is increased for the monitoring camera that detects a moving object, it is possible to reliably perform recording corresponding to the movement of the moving object. In addition, since the number of necessary sensors in addition to the monitoring camera can be reduced, the reliability of the system can be improved as compared with the conventional system.

  The best mode for carrying out the present invention will be described with reference to the drawings.

[Embodiment 1]
The first embodiment is an example in which one motion detection means is provided for one monitoring camera, and will be described with reference to FIGS. 1 includes a plurality of monitoring cameras 11, 12, 13,... 1z, motion detection means 31, 32, 33,... 3z, frequency changing means 60, recording means 70, and the like. If necessary, one or more of the vector calculation means 40, the prediction means 50, and the display device 80 may be provided.

  As the monitoring camera 11, a CCD camera, a lens type camera, an omnidirectional camera, or the like is used. The same applies to the surveillance cameras 12, 13,. The motion detection means 31 detects a moving object (for example, a human being or an animal) included in the image information captured by the corresponding monitoring camera 11. The motion detection means 32, 33,..., 3 z are provided for each monitoring camera and have the same function as the motion detection means 31. The frequency changing means 60 increases the recording frequency of the monitoring camera that detects the moving object by the motion detection means 31, 32, 33,..., 3z as compared to the monitoring camera that does not detect the moving object. The recording unit 70 records image information captured by the monitoring cameras 11, 12, 13,. The display device 80 may be of any model as long as image information captured by the monitoring camera can be displayed.

  The vector calculation means 40 obtains the moving vector of the moving object included in the captured image information for the monitoring camera that has detected the moving object by the motion detection means 31, 32, 33,. The frequency changing unit 60 provided with the vector calculating unit 40 is configured to increase the recording frequency according to the magnitude of the movement vector obtained by the vector calculating unit 40 (that is, the moving speed of the moving object).

  The predicting unit 50 predicts a monitoring camera that is likely to image the moving object next, based on the direction of the movement vector obtained by the vector calculating unit 40 (that is, the moving direction of the moving object). Specifically, the arrangement of the monitoring cameras 11, 12, 13,..., 1z is stored in advance, and the monitoring camera is predicted from the direction of the obtained movement vector with reference to the monitoring camera that detects the moving object. Specifically, a surveillance camera existing within a predetermined range from the direction of the movement vector (for example, within a range of ± 10 degrees with respect to the movement vector) is specified by searching or calculating. The frequency changing unit 60 provided with the predicting unit 50 is configured to increase the recording frequency for the monitoring camera predicted by the predicting unit 50.

  The motion detection means 31, 32, 33,..., 3z, the vector calculation means 40, the prediction means 50, and the frequency change means 60 are configured so that each function is realized by either a hardware circuit or a software program. It is configured.

  In the monitoring system configured as described above, an example of processing for recording a moving object reflected on a monitoring camera will be described with reference to FIGS. First, there are monitoring cameras 11, 12, 13, 14, 15, 16, 17, 18 arranged as schematically shown in FIG. 2, and the arrangement (positional information) of each monitoring camera is predicted by means 50 (specifically, Is stored in advance in a recording medium such as a memory. Actually, the surveillance cameras are separated from each other by several meters to several tens of meters. Further, it is assumed that the moving object M (which is assumed to be a suspicious person in this example) is located in the vicinity of the monitoring camera 11 and is moving toward the movement vector V1.

  The image storage process in FIG. 3 is repeatedly executed within a predetermined period (for example, from when the monitoring system is turned on until it is shut off). First, for image information captured by the monitoring cameras 11, 12, 13, 14, 15, 16, 17, 18, motion detection means 31, 32, 33, 34, 35, 36, 37, 38 corresponding to each monitoring camera are provided. Motion detection is performed [step S11]. The motion detect is a process for detecting the moving object M included in the image information, but since the specific process contents are well known, illustration and description thereof are omitted.

  When the moving object M is detected in the image information by the motion detection in step S11 (YES in step S12 in FIG. 3), the surveillance camera is specified [step S13]. The number of surveillance cameras to be specified may be one or a plurality, and is set in advance. For example, in the arrangement shown in FIG. 2, only the monitoring camera 11 that detects the moving object M is specified, or the monitoring cameras 12, 13, 14, 15, 16, 17, and 18 that do not detect the moving object M are specified or monitored. The surveillance cameras 12, 13, 14, and 15 arranged in the vicinity of the camera 11 are specified.

  Subsequently, for the monitoring camera identified in step S13, the recording frequency of image information captured by the monitoring camera is increased [step S16]. When the recording frequency of the image information is increased, the probability that the moving object M is recorded increases. Here, an example of a mode for increasing the recording frequency of image information will be described below. It implement | achieves with the form which combined one form or some among these forms.

Form a) The recording rate for recording image information for the specified surveillance camera is increased (in other words, the sampling time is shortened).
Form b) The image quality (resolution) at the time of imaging is increased for the specified surveillance camera.
Mode c) In the configuration in which the monitoring camera is sequentially switched to record the image information, the switching frequency (that is, the recording time per unit time) applied to the specified monitoring camera is increased.
Mode d) In order to suppress the load on the entire monitoring system, the recording rate or the image quality of the monitoring camera that does not detect the moving object M is lowered.

  For the recording frequency, a reference value (that is, a predetermined recording frequency) such as imaging one screen per second is set in advance before executing step S16 (for example, when the power is turned on or reset). After step S16 is executed, the recording frequency differs for at least one of the monitoring cameras 11, 12, 13, 14, 15, 16, 17, and 18.

  Then, the image information is individually recorded in accordance with the recording frequency set for each surveillance camera [step S17], the recording frequency is set as a reference value in preparation for the next processing [step S18], and the image storage processing is finished. . If the display device 80 is provided, the image information recorded in the recording means 70 may be displayed on the display device 80.

In addition to the processing described above, the following processing may be added and executed.
First, the first configuration obtains a movement vector of the moving object M included in the image information captured by the vector calculation unit 40 for the monitoring camera specified in step S13 [step S14]. However, since the coordinate axes are different between the image information captured by each monitoring camera and the planar arrangement shown in FIG. 2, it is necessary to perform coordinate conversion when executing the processing. In step S16 in this configuration, the recording frequency of the surveillance camera specified in step S13 is increased according to the magnitude of the movement vector obtained in step S14 (that is, the moving speed of the moving object). For example, as the size of the movement vector in FIG. 4 increases, the recording frequency is increased stepwise as shown by a solid line, or the recording frequency is increased as a curve (or straight line) as shown by an alternate long and short dash line. Set according to the type of moving object.

  In the second configuration, for the movement vector obtained in step S14, the prediction unit 50 next selects the moving object M from among the monitoring cameras identified in step S13 based on the direction of the movement vector (that is, the moving direction of the moving object). Is predicted [step S15]. For example, when prediction is performed according to the arrangement of FIG. 2, the surveillance camera 11 that has detected the moving object M is used as a reference, and within a predetermined range from the obtained direction of the movement vector V1 (for example, as indicated by a broken line, the movement vector V1 is used as a reference). Surveillance cameras 13, 16 etc. existing in a range of up to ± 15 degrees). If the moving body M moves toward the movement vector V2 represented by a two-dot chain line, the prediction unit 50 predicts the monitoring cameras 14, 18 and the like. If the moving body M moves toward the movement vector V3 represented by a two-dot chain line, the prediction unit 50 predicts the monitoring cameras 12, 15 and the like. In step S16 in this configuration, in addition to (or instead of) the monitoring camera specified in step S13, the recording frequency is increased for the monitoring camera predicted in step S15.

According to the first embodiment described above, the following effects can be obtained.
(A1) When the moving object M included in the image information captured by the monitoring cameras 11, 12, 13,..., 1z corresponding to the motion detection means 31, 32, 33,..., 3z is detected (see step S12 in FIG. 3). ), The frequency changing means 60 increased the recording frequency of the monitoring camera that detected the moving object M as compared to the monitoring camera that did not detect the moving object M (see step S16 and forms a, b, c, and d in FIG. 3). Therefore, recording corresponding to the movement of the moving object M can be reliably performed for the monitoring camera that has detected the moving object M. Moreover, since it is not necessary to provide a sensor other than the monitoring cameras 11, 12, 13,..., 1z, the reliability of the monitoring system can be improved as compared with the conventional case. In this example, the moving object M is applied to a suspicious person (human being), but any moving object can be applied to an animal or the like.

(A2) Since the recording frequency is increased for the monitoring camera arranged in the vicinity of the monitoring camera that has detected the moving object M by the motion detection means 30 (see step S16 in FIG. 3), no matter what the moving object M moves It can be recorded reliably.

(A3) The motion detection means 31, 32, 33,..., 3z specifies one or a plurality of monitoring cameras based on the monitoring camera that detected the moving object M (see step S13 in FIG. 3), and the moving vector of the moving object M V1 is obtained (see step S14 in FIG. 3), and a surveillance camera that may image the moving body M next is predicted based on the direction of the movement vector V1 (see step S15 in FIG. 3) and identified. Among the monitoring cameras, the recording frequency was increased for the monitoring camera predicted in step S15 (see step S16 in FIG. 3).
For example, in the arrangement of FIG. 2, since the recording frequency of the predicted monitoring cameras 13 and 16 is increased, the moving body M can be imaged with the monitoring cameras 13 and 16 (see FIG. 2). In this way, if the recording frequency of the monitoring camera along the moving direction of the moving object M is increased in advance, the moving object M can be imaged in cooperation with the monitoring cameras 11, 12, 13,.

(A4) The vector calculation means 40 obtains the movement vector V1 of the moving object M included in the image information (see step S14 in FIG. 3), and the recording frequency for the surveillance camera specified in step S13 according to the magnitude of the movement vector V1. (See step S16 in FIG. 3). Since the recording frequency increases as the moving object M moves faster, recording corresponding to the movement of the moving object M can be performed more reliably.

[Embodiment 2]
The second embodiment is an example in which one motion detection means is provided for a plurality of surveillance cameras, and will be described with reference to FIGS. The configuration of the monitoring system is the same as that of the first embodiment, and in order to simplify the illustration and explanation, the second embodiment will be described with respect to differences from the first embodiment. Therefore, the same elements as those used in Embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

  The monitoring system shown in FIG. 5 is different from the monitoring system shown in FIG. 1 in that the moving object detection sensors 21, 22, 23,..., 2z are newly added, and a plurality of motion detection means 31, 32, 33, The difference is that one motion detection means 30 is provided instead of 3z. The moving body detection sensors 21, 22, 23,..., 2z have a function of detecting a moving body, and are provided corresponding to the monitoring cameras 11, 12, 13,. That is, it is a structure provided with one moving body detection sensor with respect to one monitoring camera, and the example of arrangement is shown in FIG. The motion detection means 30 includes detection signals output from the moving object detection sensors 21, 22, 23,... 2z, and image information (including image signals) output from the monitoring cameras 11, 12, 13,. And has a function of detecting a moving object and calculating a moving speed of the moving object.

  The image storage processing shown in FIG. 7 is a processing example that replaces the image storage processing shown in FIG. 3, and will be described based on the configuration example shown in FIG. In FIG. 6, the moving object detection sensor 27 corresponding to the monitoring camera 17 has a pair of sensors 27a and 27b, and when one of the sensors detects the moving object M and outputs a detection signal, the other sensor detects the moving object M. Even if it detects, it is comprised so that a detection signal may not be output. It is assumed that the moving body M moves toward the arrow D1.

  The moving object detection sensors 21, 22, 23, 24, 25, 26, 27 (27a, 27b) and 28 always detect the presence or absence of the moving object M [Step S21], and when any of the moving object detection sensors detects the moving object M, (YES in step S22), the current time is stored as the first detection time [step S23]. If the moving object M is not detected (NO in step S22), the process proceeds to the next step S11 without storing.

As in FIG. 3, the motion detection means 30 performs motion detection for each surveillance camera [step S11], and when a moving object M is detected for any surveillance camera (YES in step S12), the surveillance camera is specified. [Step S13] The current time is stored as the second detection time, and a period from the first detection time stored in Step S23 is obtained [Step S24].
Note that the time stored in step S23 and step S24 needs to correspond to the moving object detection sensor and the monitoring camera. For example, it is effective when the moving body M is detected by the monitoring camera 11 after the moving body M is detected by the moving body detection sensor 21. However, if the moving body M is detected by the monitoring camera 12 after the moving body detection sensor 21 detects the moving body M, it means that the moving body M has changed its direction, so even if the time is stored or the period is obtained, it is invalid. It becomes.

  Further, since the distance between the corresponding monitoring camera and the moving object detection sensor is known in advance, the moving speed of the moving object M can be obtained from the period obtained in step S24. For example, in FIG. 8, when the moving object M is moving in the direction of the arrow D1, the period ts is determined by the first detection time t1 detected by the moving object detection sensor 21 and the second detection time t2 detected by the monitoring camera 11. Desired. If the moving object detection sensor 21 and the monitoring camera 11 are separated by a distance L, the moving speed of the moving object M can be obtained by calculating L / ts.

In step S16, one or more of the forms a to d described in the first embodiment may be realized, and one or more of the following forms e, f, and g may be realized.
Form e) As the period ts becomes shorter, the recording frequency of the image information related to the surveillance camera specified in step S13 is increased. As in the example shown in FIG. 9, the recording frequency is increased in the form of a curve (or straight line) represented by a solid line, or the recording frequency is increased stepwise as represented by a two-dot chain line.
Form f) As the moving speed of the moving object M increases, the recording frequency of the image information relating to the monitoring camera specified in step S13 is increased. In FIG. 4 described above, if the moving speed is used instead of the size of the moving vector, it can be applied as it is.
Form g) In a configuration in which image information is recorded at predetermined intervals (for example, 2 seconds or 1 minute), an area where the moving object M first appears as image information of the monitoring camera instead of obtaining a period and a moving speed in step S24 Is identified. In step S16, the recording frequency of the image information is increased according to the specified area.

The form g will be described with reference to FIG. 10A. The display screen of the display device 80 is partitioned into a plurality of regions (16 regions in this example), and the moving body M is first selected among the plurality of regions. The recording frequency is increased according to the detected area. That is, in the example in which the moving body M moves from the upper left to the lower right of the screen, the area where the moving body M is detected first is slanted in the order of the region G1, the region G2, the region G3, the region G4, the region G5, the region G6, and the region G7. To increase the recording frequency step by step.
Similarly, when the moving object M moves from the upper side to the lower side (in the direction of the arrow D2) on the display screen, the classification is as shown in FIG. That is, from the upper side, the area G1 → the area G2 → the area G3 → the area G4 is divided to increase the recording frequency step by step.
In this example, the display screen is divided into a plurality of areas with a uniform shape (that is, a quadrangle), but the display screen is divided into a non-uniform shape or a non-uniform area for one or more of the plurality of areas. Even in this case, the same effect can be obtained.

According to the second embodiment described above, the following effects can be obtained.
(B1) One moving object detection sensor is provided corresponding to one monitoring camera (see FIG. 6), and after detecting the moving object M by the moving object detection sensors 21, 22, 23,. As the time period until the moving object M is detected becomes shorter, the recording frequency of the identified surveillance camera is increased (see step S16 in FIG. 7). That is, since the recording frequency is increased as the moving speed of the moving object M increases, recording corresponding to the movement of the moving object M can be performed reliably. In addition, although it is necessary to provide one moving object detection sensor corresponding to one monitoring camera, it is not necessary to provide a pair as in the prior art, and only one is required, so that the reliability of the monitoring system can be improved compared to the conventional one. it can.

(B2) The display screen is partitioned into a plurality of areas (see FIG. 10), and the recording frequency is increased according to the area where the moving object M is first detected among the plurality of areas (see step S16 in FIG. 7). . That is, since it is possible to estimate whether the moving speed of the moving body M is fast or slow according to the area where the moving body M is detected first, the recording frequency is increased according to the estimation result. Therefore, after the moving object M is detected for the first time, recording corresponding to the movement of the moving object M can be reliably performed. In the example of FIG. 10, the area is divided into equal areas, but may be divided into non-uniform areas having different sizes and shapes.

(B3) Since other requirements, configurations, operations, and the like are the same as those of the first embodiment, the same effects as those of the first embodiment can be obtained {see the above items (a1) to (a4)}.
Although only the moving object detection sensor 27 includes the pair of sensors 27a and 27b, a configuration may be provided for all of the moving object detection sensors. By providing such a pair of sensors, it is possible to reliably detect the moving body M that moves from the opposite direction toward the monitoring camera, not only in one direction. Furthermore, you may provide the moving body detection sensor which consists of three or more sensors (Only one sensor can output a detection signal) according to the moving direction which goes to a monitoring camera.

[Other Embodiments]
Although the best mode for carrying out the present invention has been described in accordance with the first and second embodiments, the present invention is not limited to the embodiment. In other words, the present invention can be implemented in various forms without departing from the gist of the present invention. For example, the following forms may be realized.

(C1) In the second embodiment, after detecting the moving object M with the moving object detection sensors 21, 22, 23,..., 2z, the moving object M is detected in the image information captured with the monitoring cameras 11, 12, 13,. The recording frequency was increased on the condition that this is done (see step S16 in FIG. 7). It may replace with this form and you may comprise so that the recording frequency may be unconditionally raised about the surveillance camera corresponding to the moving body detection sensor which detected the moving body M. FIG. For example, in the arrangement shown in FIG. 6, when the moving object detection sensor 21 detects the moving object M, the recording frequency of the image information captured by the moving object detection sensor 22 is increased. Since the moving object detection sensor is installed in the vicinity of the monitoring camera, after the moving object M is detected by the moving object detection sensor, there is a high possibility that the image is captured by the monitoring camera. Therefore, the probability of recording the moving object M can be increased by increasing the recording frequency.

(C2) In the first and second embodiments, only the stationary monitoring cameras 11, 12, 13,..., 1z are provided, but at least one movable monitoring camera may be provided. Here, “movable” means that the camera is moved up and down and left and right by the swing mechanism or the image captured by the zoom mechanism is enlarged or reduced. The form provided with either one or both corresponds.

  For example, when the former swing mechanism is provided, the surveillance camera is configured to move along the direction of the movement vector of the moving object M obtained by the vector calculation means 40. According to this configuration, since the subject (moving body M) appears to move slowly or stop, the same effect as when the recording frequency is increased can be obtained. If the recording frequency is increased separately from the head swing mechanism, the subject can be recorded more clearly.

  Further, when the latter zoom mechanism is provided, when the moving object M is detected by the motion detection means 30, 31, 32, 33,. In the case where a marking function for surrounding the detected moving body M with a mark is provided, enlargement / reduction is performed so that the portion surrounded by the mark becomes the entire screen. According to the latter configuration, the subject (moving body M) is enlarged and reduced, so that the same effect can be obtained as when the recording frequency is increased. If the recording frequency is increased separately from the zoom mechanism, the subject can be recorded more clearly.

It is a block diagram showing typically the example of composition of a surveillance system. It is a top view which represents typically the example of arrangement | positioning of a surveillance camera. It is a flowchart showing the example of a procedure of an image storage process. It is a figure explaining the relationship between the magnitude | size of a movement vector, and a recording frequency. It is a block diagram showing typically the example of composition of a surveillance system. It is a top view which represents typically the example of arrangement | positioning of a surveillance camera and a moving body detection sensor. It is a flowchart showing the example of a procedure of an image storage process. It is a figure explaining the method of calculating the moving speed of a moving body. It is a figure explaining the relationship between the length of a period, and recording frequency. It is a figure showing an example of the display screen of a display apparatus.

Explanation of symbols

11, 12, 13, ..., 1z surveillance camera 21, 22, 23, ..., 2z moving object detection sensor 31, 32, 33, ..., 3z motion detection means 40 vector calculation means 50 prediction means 60 frequency change means 70 recording means 80 Display device M

Claims (6)

A monitoring system comprising a plurality of monitoring cameras and recording means for individually recording image information captured by the plurality of monitoring cameras,
Motion detection means for detecting a moving object included in image information captured by each of the plurality of monitoring cameras;
A monitoring system comprising: a frequency changing means for increasing the frequency of recording image information in the recording means for a monitoring camera that detects a moving object by the motion detection means, compared to a monitoring camera that does not detect a moving object. A monitoring system comprising a plurality of monitoring cameras and recording means for individually recording image information captured by the plurality of monitoring cameras,
Motion detection means for detecting a moving object included in image information captured by each of the plurality of monitoring cameras;
A monitoring system comprising: a frequency changing unit that increases a frequency of recording image information in the recording unit for a monitoring camera arranged in the vicinity of the monitoring camera that has detected a moving object by the motion detecting unit. The monitoring system according to claim 1 or 2,
For a surveillance camera that detects a moving object by means of motion detection means, a vector calculating means for obtaining a moving vector of the moving object included in the captured image information;
Predicting means for preliminarily storing the arrangement of a plurality of monitoring cameras and predicting a monitoring camera that may image a moving object next based on the direction of the movement vector obtained by the vector calculation means,
The frequency changing means is a monitoring system that increases the frequency of recording image information in the recording means for the monitoring camera predicted by the prediction means. A monitoring system comprising a plurality of monitoring cameras and recording means for individually recording image information captured by the plurality of monitoring cameras,
A moving object detection sensor that is provided corresponding to each surveillance camera and detects a moving object;
Motion detection means for detecting a moving object included in image information captured by each of the plurality of monitoring cameras;
Frequency changing means for increasing the frequency at which image information is recorded in the recording means by the monitoring camera that has detected the moving object, as the period from when the moving object is detected by the moving object detection sensor to when the moving object is detected by the motion detecting means becomes shorter. And a monitoring system. A monitoring system according to claim 4, wherein
The motion detection means divides the screen displayed as image information into a plurality of areas, and increases the frequency of recording the image information on the recording means according to the area where the moving object is first detected among the plurality of areas. . A monitoring system according to any one of claims 1 to 5,
For a monitoring camera that detects a moving object by means of motion detection means, it has a vector calculation means for obtaining a moving vector of the moving object included in the captured image information,
The frequency changing means is a monitoring system that increases the frequency of recording image information in the recording means according to the magnitude of the movement vector obtained by the vector calculating means.

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