JP4215540B2 - Surveillance camera device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a surveillance camera device.
[0002]
[Prior art]
In recent years, crime prevention has been increasing by installing surveillance camera devices in banks and stores. On the other hand, people who are trying to invade the store, etc. are continually following, for example, the intruder sprays the paint spray on the camera to attach the paint to the lens and make it difficult to take an image. The imaging direction is displaced by scraping with a stick. In this way, to prevent intruders from recognizing their face and appearance is called a plan.
[0003]
Various methods have been proposed as a method for detecting and determining the above-mentioned scheme. For example, a frequency component of a picked-up image is detected, and when there is a high frequency component, it is determined that the image is a normal image, and when the high frequency component disappears, it is determined that an image has been taken. Further, for example, there is a camera that performs image processing in a monitoring camera or a device connected to the monitoring camera. Specifically, there is a method of monitoring the integration value by using luminance value integration processing of the captured image for each area obtained by dividing the captured image into a plurality of areas (this processing is used for iris and retrograde correction). For example, when the paint is applied to the lens by spraying, the integral value changes little by little (depending on how the spray is sprayed). A threshold is set for such a change, and it is determined whether or not it is a plan with this threshold as a boundary. Further, when the lens is covered with a cloth or the like, the integrated value changes more rapidly than in the case of using the spray. Also in this case, it is possible to determine the plan by setting a threshold value for the integral value and a threshold value for the change amount. In addition, the following can be considered as another determination method based on image processing. For example, a histogram is created from the luminance information of each pixel, a threshold value is automatically or manually determined, the image is binarized, and a method for judging whether the plan is normal or not from a rough luminance change, and the luminance for each pixel is preset. A method may be considered in which all portions exceeding (or below) the threshold are integrated and the luminance distribution of each field is used as a judgment material. Furthermore, it is also conceivable to make a plan determination by blurring of a captured image (which occurs when an intruder is holding the surveillance camera with a stick or the like). And when it determines with it being a plan, alarms, such as an alarm, are output (refer patent document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-160975
[Problems to be solved by the invention]
However, in the prior art, even if a plan is detected, it is no longer possible to take an image with the surveillance camera, and there is no choice but to wait for the guard to go out with an alarm.
[0006]
SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a surveillance camera device that can continue surveillance photography even when a plan is received and that can reduce unnecessary dispatch of guards. To do.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, the surveillance camera device of the present invention includes posture return means for returning the camera body to the original posture, and determination for determining whether or not the posture of the camera body is displaced with respect to the original posture. And a control means for causing the posture return means to return the posture of the camera body when it is determined that the posture of the camera body is displaced, the posture return means being a camera body or a structure including the camera body And a heat applying means for applying heat to the shape memory member.
[0008]
The shape memory member may comprise a plurality of shape memory members, and may comprise individual heat application means for individually applying heat to each shape memory member.
[0009]
Preferably, the control means causes the camera body to return to its posture after a predetermined time has elapsed since it has been determined that the camera body has been displaced. Here, if the retracting operation is executed immediately after it is determined that the posture of the camera body has been displaced, the intruder is informed of the recovery of the camera posture, and further measures are taken. On the other hand, if the configuration is such that the recovery operation is executed after a predetermined time has elapsed since it was determined that the posture of the camera body has been displaced, such further measures can be avoided.
[0010]
In these configurations, it is preferable that the camera posture recovery after the posture returning operation is determined, and the notification is performed when it is determined that the camera posture is not recovered or is not sufficiently recovered.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A monitoring camera device according to an embodiment of the present invention will be described below with reference to FIGS.
[0012]
FIG. 1 is an explanatory view showing the surveillance camera device 1. The surveillance camera device 1 includes a camera body 1a, an imaging direction control device (pan / tilt mechanism) 1b, an I / O interface 1c, and the like. Each of these elements is controlled by, for example, the microcomputer 14 (see FIG. 2) of the camera body 1a. The imaging direction control device 1b is a device that performs pan / tilt control in the camera body 1a, and includes an actuator such as a motor (not shown). The drive control signal to the actuator of the imaging direction control device 1b is given from the microcomputer 13, for example. The video imaged by the camera body 1a is recorded on a video cassette recorder (VCR) 2 and displayed on the monitor 3. Moreover, the communication part which is not shown in figure is provided and it reports to a security center at the time of abnormality.
[0013]
FIG. 2 is a block diagram showing the camera body 1a. In addition to the lens, the lens mechanism 11 includes a focus control unit that adjusts the position of the lens to form a focused state, a diaphragm unit that performs diaphragm adjustment, and the like.
[0014]
The image processing unit 12 includes a CCD 12a, an A / D conversion circuit 12b, an image analysis unit 12c, and the like. The CCD 12a receives the image light of the subject that has passed through the lens mechanism 11, converts it into an electrical signal, and outputs it. The A / D conversion circuit 12b converts the video signal into a digital video signal. The image analysis unit 12c performs analysis processing for abnormality determination (planning determination) based on the digital video signal. As for the analysis process of the captured image, various analysis processes exist as described in detail in the conventional example, and the analysis process is not limited in any way.
[0015]
The posture detection unit 14 includes a posture sensor 14a, an A / D conversion circuit 14b, and a sensor analysis unit 14c, and notifies the microcomputer 13 of posture information of the camera body 1a. Note that posture information at the beginning of camera installation is stored in a memory (not shown) of the microcomputer 13. By comparing the initial posture information with the subsequent posture information, the posture displacement of the camera body 1a can be detected. As the posture sensor 14a, a gyro or the like can be used, but posture detection can also be performed using an orientation sensor, a magnetic sensor, a tilt sensor, or the like. Also, the posture displacement of the camera body 1a can be detected by analyzing the captured image. For example, the initial captured image may be stored in the memory, and it may be determined that the posture has changed when the background image portion does not coincide with the subsequent captured image. Of course, these posture detection means are also means for determining posture return.
[0016]
The posture return drive device 15 is for returning the displaced posture of the camera body 1a to the original posture. As the posture return drive device 15, a pan / tilt mechanism can be used. If the pan / tilt mechanism is not destroyed, it is possible to return to the original setting position and continue imaging in the original posture.
[0017]
Further, it is preferable to provide a posture return drive device 15 that does not depend on the pan / tilt mechanism. For example, as shown in FIG. 3, as a support member 21 for suspending a camera body 1a fixedly arranged on a ceiling wall 30, for example, a plurality of plate-shaped shape memory alloys are laminated (the shape at the time of heating recovery is a flat plate shape) And a sufficient supporting strength and a restoring force so that the shape memory alloy can be heated by a heating wire or a planar heating element. Even if the camera body 1a is picked up by a stick or the like by an intruder and the support member 21 bends and the camera posture changes as shown in FIG. 3A, heat is applied to the support member 21 made of a shape memory alloy. As shown in FIG. 3B, the support member 21 has an original shape, and the imaging direction of the camera can be returned to the original imaging direction.
[0018]
Further, as shown in FIG. 4, a normal rod (a pipe that can be bent greatly but cannot be bent) is used as the hanging rod 22 for suspending the camera body 1a fixedly arranged on the ceiling wall 30. The camera body 1a is connected to the tip of the lowering rod 22 by support members 23A, 23B, and 23C made of, for example, three coil spring-like shape memory alloys. The support members 23A, 23B, and 23C can be individually heated with a heating wire or the like. In addition, said coil spring-like shape memory alloy shall be extended | stretched by heat provision, and the expansion | extension degree shall be proportional to the applied heat | fever. The heat application temperature can be adjusted by the applied voltage. When the camera body 1a is picked up by an intruder with a stick or the like, the hanging stick 22 bends and the posture of the camera body 1a changes, the microcomputer 13 determines the camera based on the analysis result of the captured image and the output of the posture detection unit 14. It is determined what posture the main body 1a is in. Based on this determination, the supporting member 23 (23A, 23B, 23C) to be extended is selected and heat is applied. For example, when the front part of the camera is tilted forward, the support member 23C is selected to apply heat. The voltage for applying heat is gradually increased while confirming the posture based on the output of the posture detector 14. The same applies when tilting in another direction.
[0019]
One support member 23 is composed of a plurality of shape memory alloy members and is configured to individually apply heat to each shape memory alloy member. By repeating individual heat application and posture confirmation, the original posture is restored. You may come back.
[0020]
Moreover, not only using such a shape memory alloy, for example, a ratchet mechanism is used, the displacement posture when being caught with a rod or the like is held by a ratchet claw, and energy for return is stored. A winding spring or the like to be stored may be provided, and the camera may be returned to the original posture by the energy of the winding spring by releasing the holding operation by the ratchet mechanism.
[0021]
The microcomputer 13 determines the abnormality by determining the displacement of the posture of the camera body 1a based on the image analysis or the output of the posture detection unit 14, but does not perform notification (report) only by this abnormality determination, but the camera described above. Attempts to recover the posture of the main body 1a, determine the camera posture recovery after the posture return operation, and notify when the camera posture is not recovered or is not sufficiently recovered.
[0022]
Further, in this embodiment, when the displacement of the camera posture is determined, the camera posture returning operation is not performed immediately, but for example, the camera posture returning operation is performed after one minute. Suppose that an intruder performs a plan with a masked surface, then removes the masked surface and starts working with peace of mind. In such a state, the camera posture is recovered, and the possibility that the surveillance camera device 1 can capture and record the face of the intruder who has removed the cover is increased.
[0023]
【The invention's effect】
As described above, according to the present invention, it is possible to continue monitoring shooting even when a plan is received, and it is possible to reduce the unnecessary dispatch of guards.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a monitoring camera device according to an embodiment of the present invention.
2 is a block diagram showing a camera body of the surveillance camera device of FIG. 1. FIG.
FIGS. 3A and 3B are explanatory views showing an example of a posture return driving device, where FIG. 3A shows a state of camera posture displacement, and FIG. 3B shows a state of camera posture return.
FIG. 4 is an explanatory view showing another example of a posture return drive device.
[Explanation of symbols]
1 Surveillance Camera Device 1a Camera Body 2 VCR
3 Monitor 14 Posture Detection Unit 21 Support Member 22 Hanging Rod 23 Support Member

Claims (4)

Posture returning means for returning the camera body to the original posture, judgment means for judging whether the posture of the camera body is displaced with respect to the original posture, and the posture when it is judged that the posture of the camera body is displaced Control means for performing the posture return of the camera body by the return means ,
The surveillance camera device characterized in that the posture returning means includes a shape memory material that supports a camera body or a structure including the camera body, and a heat application means that applies heat to the shape memory member . 2. The surveillance camera device according to claim 1 , wherein the shape memory member comprises a plurality of shape memory members, and comprises individual heat application means for individually applying heat to each shape memory member. . 3. The monitoring camera device according to claim 1 , wherein the control unit causes the camera body to return to a posture after a predetermined time has elapsed since it was determined that the posture of the camera body was displaced. Camera device. 4. The monitoring camera device according to claim 1, wherein the camera posture recovery after the posture return operation is determined, and notification is made when it is determined that the camera posture is not recovered or is not sufficiently recovered. A surveillance camera device configured as described above.

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