JP2721597B2 - Surveillance imaging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance imaging apparatus used for photographing a trespasser or a visitor who has entered a predetermined surveillance area with a camera and projecting it on a monitor at a remote place for confirmation. is there.

[0002]

2. Description of the Related Art In such a monitoring image pickup apparatus, a single camera generally monitors a relatively large area. Conventionally, as shown in FIG. 6, one camera C is provided with a wide-angle lens (not shown) indicated by W to monitor a required area, or as shown in FIG. As shown, camera C
Any method is adopted, in which a lens having a standard angle of view indicated by θ is provided oppositely, and a camera C, which is rotatably held, is constantly reciprocated in the R angle range to monitor a required area. ing.

[0003]

However, in the method of FIG. 6, if the angle of view by the lens is too wide, the image displayed on the monitor screen of the monitor is distorted, so that an object such as a human body is placed in the monitor area. It is possible to simply confirm whether or not there is a camera, but it is difficult to know details of a detected object such as a human body from the video, and the function as a monitoring imaging apparatus cannot be sufficiently performed.

On the other hand, the method shown in FIG. 7 has an advantage that the image is not distorted by using the lens having the standard angle of view θ. However, since the camera C is always driven and constantly rotated, the running is performed. Not only is the cost higher,
The rotation mechanism provided on the holding portion of the camera C must be designed so as to have sufficient durability to be able to rotate at all times. In this respect, the cost is further increased. There are poor disadvantages. In addition, when the camera C is at one rotation end position indicated by a solid line in FIG. 7, for example, an illegal intruder or the like monitors a location corresponding to the other rotation end position of the camera C indicated by a dashed line in FIG. It is possible to easily pass through without being performed, which is a serious problem as a monitoring imaging apparatus.

Accordingly, the present invention provides a surveillance imaging apparatus which can reliably detect an object in a monitoring area at a low running cost with a low-cost and highly reliable configuration and can know the object in detail with a clear image. It is a technical task to provide.

[0006]

According to the present invention, as a technical means for achieving the above object, a monitoring imaging apparatus is constituted as follows. That is, a plurality of sensors each having a sensor area set at a different place in the area to be monitored, detecting an object existing in the sensor area and outputting a detection signal, and a range covering at least the monitoring area. A camera rotatably mounted in the camera, a position detection unit for detecting a current position in a rotation direction of the camera, and a sensor for determining a sensor area where an object is present based on the detection signal output from any of the sensors. Area determination means,
Calculating means for calculating the direction and angle of rotation of the camera based on the angle data set in advance for the sensor area determined by the sensor area determining means and the current position data of the position detecting unit; Rotation control means for driving a rotation drive source to perform rotation control so that a camera angle of view of the camera matches the sensor area determined by the sensor area determination unit.

[0007]

When an object such as a human body enters any of the sensor areas in the monitoring area, a detection signal is output from a sensor for which the sensor area has been set. Is determined. Based on the preset angle data of the determined sensor area and the current position data of the camera by the position detecting unit, the calculating means determines that the camera angle of view is necessary for the camera angle of view to match the determined sensor area. The rotation direction and rotation angle of the camera are calculated. A rotation drive source such as a motor is driven according to the calculated value, and the rotation of the camera is controlled. That is, the rotation is controlled so that the camera tracks the detected object.

Accordingly, since the camera is only activated and rotated only when an object enters the monitoring area, the running cost is reduced and the reliability is improved.
In addition, since the rotating mechanism of the camera does not require much durability, an inexpensive configuration may be used. In addition, since the camera tracks the object moving in the monitoring area, the angle of view of the camera is narrowed, and a clear image with extremely little distortion can be obtained.
The object does not pass through the monitoring area due to the imaging omission.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing an appearance of an embodiment of the present invention, and FIG. 2 is a block diagram showing the same. In these drawings, as shown in FIG. 2, six infrared passive sensors S1 to S6 for detecting an object are arranged inside a sensor box 1, and each sensor S1 to S6 has As shown in FIG. 3, a plurality of light-collecting lenses L each composed of a Fresnel lens, which is an optical system, are fixed to the front surface of the sensor box 1 so as to face in a predetermined direction. Seven sensor areas E1 to E7 are set in the monitoring area, which will be described later. In addition, camera C
A lens having a standard angle of view indicated by θ in FIG.

From the lower surface of the sensor box 1, a motor 9
As a result, the drive shaft 2 rotated in the forward and reverse directions is projected, and an inverted U-shaped holding frame 3 is suspended and fixed to the lower end of the drive shaft 2 so as to rotate integrally. ,
The camera C is mounted between the holding pieces on both sides of the holding frame 3 with fixing screws 5. Accordingly, the rotation of the motor 9 is transmitted to the camera C via the drive shaft 2 and the holding frame 3, whereby the camera C is rotated in the horizontal direction indicated by the arrow.

As an electric control system, each of the sensors S1 to S1
Based on the object detection signal output from S6, a sensor area discriminating unit 6 for discriminating the sensor areas E1 to E7 where the object is present, a microcomputer 7 having a memory, an arithmetic function and the like, and controlling the entire apparatus, The motor 9 described above is driven by a drive signal from the computer 7.
Angle detection unit 1 comprising a motor drive circuit 8 for controlling the rotation of the motor and an encoder for detecting the rotation angle of the motor 9
0.

Next, the operation of the above embodiment will be described with reference to FIG.
This will be described in detail with reference to FIG. First, the fixing screw 5 is loosened and the camera C is rotated vertically with respect to the holding frame 3 as shown by the arrow in FIG.
After setting the angle opposite to E6, the fixing screw 5 is tightened to fix the camera C to the holding frame 3. In the memory of the microcomputer 7, each sensor area E1 is stored.
Angle data from the reference points E7 to E7 are set and stored in advance.

The microcomputer 7 constantly determines whether or not an object detection signal has been input from any of the sensors S1 to S6 to the sensor area determination unit 6 (step S5).
1) When it is determined that the object detection signal has been input, the start switch is turned on to start driving the camera C (step S2). On the other hand, the sensor area discriminating unit 6 detects the sensor areas E1 to E1 to which the detection signals are output based on the distinction of the sensors S1 to S6 that output the object detection signals.
E7 is determined (step S3).

In this embodiment, six sensors S1 to S6
, Seven sensor areas E1 to E7 are set by the lens L, and the sensors S1 to S6 and the sensor area E1 are set.
To E7 do not correspond integrally. This makes it possible to monitor more places with a small number of sensors S1 to S6.
As shown in FIG. 4 (a), two detection areas e
1 and e2, and two detection areas e are similarly set by the lens L with respect to the second sensor S2 as shown in FIG.
3 and e4 are set, and one of the detection areas e2 and e3 is arranged so as to overlap or approach each other, as shown in FIG. 3C. As a result, three sensors are provided for two sensors S1 and S2. Areas E1 to E3 are set. Therefore,
When the detection signal is output only from the first sensor S1, the sensor area determination unit 6 determines whether the first sensor area E1
When the detection signal is output only from the second sensor S2, the third sensor area E3 is set to the both sensors S1 and S2.
When the detection signal is output from both, the second sensor area 2 is determined to be the sensor area where the detection object is present.

When the sensor areas E1 to E7 from which the detection signals are output are determined in this manner, the microcomputer 7 subsequently stores the information in the memory in advance based on the output of the rotation angle detector 10. The current position data, which is the rotation angle of the camera C from the reference point, is read out (step S4), and the angle data set and stored in advance for the sensor areas E1 to E7 determined above is read out. Based on the data, a rotation direction and a rotation angle of the camera C required to include the above-described determined sensor areas E1 to E7 within the angle of view of the camera C are calculated (step S5). Furthermore, the microcomputer 7
Outputs a drive signal to the motor drive circuit 8 so as to rotate the motor in the rotation direction, which is the result of the calculation, and outputs the current position data of the motor 9, that is, the camera C, output from the rotation angle detection unit 10 with the rotation. The rotation of the motor 9 is continued until the calculated value is matched (step S
6). When the rotation of the motor 9 is stopped by rotating the camera C to the predetermined position in this way, the current position data output from the rotation angle detector 10 at that time is replaced with the above-described current position data and updated and stored (step S1). S7).

Therefore, the camera C activated in step S2 and directed to include the sensor areas E1 to E7 in which the object is present within its own camera angle of view, photographs the object. Here, since the camera C is provided with a lens having a standard angle of view θ, the image taken of the object and displayed on the monitor is clear with almost no distortion, and the object can be known in detail. The photographing by the camera C is continued until it is determined in step S8 that the detection signal input to the sensor area determination unit 6 has changed, that is, as long as the object exists in the sensor areas E1 to E7. When it is determined that the detection signal input to the sensor area determination unit 6 has changed, whether or not the detection signal has been subsequently input to the sensor area determination unit 6, that is, whether the object has gone out of the monitoring area, or It is determined whether or not it has moved to the other sensor areas E1 to E7 (step S9). If the input detection signal has changed, the process jumps to step S3 and repeats the same operation as described above. The camera C is rotated so as to follow, and the photographing of the object is continued. On the other hand, when the input of the detection signal is lost, since the object has moved out of the monitoring area, the driving of the camera is stopped (step S10), and then the process jumps to step S1 to monitor the next object. Wait for entry into the area.

It should be noted that the present invention is not limited to the above-described embodiment, but can include various modifications without departing from the scope of the claims. For example, in the above embodiment, the monitoring area is divided into two planes to provide a sensor area,
Although the case where the camera C is rotated only in the horizontal direction has been described, when the security area is divided three-dimensionally and the sensor area is provided in the vertical direction, the camera C is rotated not only in the horizontal direction but also in the vertical direction. What should be done is. Also,
Increasing the number of sensor areas in a given monitoring area can reduce the camera's angle of view accordingly,
Image distortion can be minimized. Further, a position detecting sensor constituted by a semiconductor position detecting element may be used in place of the infrared passive type sensor, and the camera C may be made variable in focus. Furthermore, the security alarm buzzer can be sounded or the illumination lamp can be turned on by the object detection signals of the sensors S1 to S6.

[0018]

As described above, according to the monitoring imaging apparatus of the present invention, the camera is only rotated and started only when an object enters the monitoring area, so that the running cost can be considerably reduced and the reliability can be reduced. Sex is greatly improved,
Further, since the rotating mechanism of the camera does not require much durability, it can be made inexpensive, and can achieve a significant cost reduction. . In addition, since the camera tracks the object detected by the sensor, the angle of view of the camera is narrowed, and a clear image with almost no distortion can be obtained.
The detected object can be known in detail, and the object can be reliably detected by preventing the object from passing through the monitoring area due to the omission of imaging.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of an embodiment of the present invention.

FIG. 2 is a block diagram showing the same.

FIG. 3 is an explanatory diagram showing a sensor area in a plan view;

FIG. 4 is an explanatory diagram of setting a sensor area according to the first embodiment;

FIG. 5 is a flowchart of the above.

FIG. 6 is an explanatory view showing a conventional apparatus in a plan view.

FIG. 7 is an explanatory view showing another conventional apparatus in a plan view.

[Explanation of symbols]

 Reference Signs List 6 Sensor area discriminating section (sensor area discriminating means) 7 Mac Quil computer (computing means, rotation control means) 9 Motor (rotation driving source) 10 Rotation angle detecting section (position detecting section) S1 to S6 Sensor E1 to E7 Sensor area C camera θ Camera angle of view

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Akira Yukawa, Inventor, 4-7-5, Oninohama, Otsu, Shiga Prefecture Inside OPTEX Co., Ltd. (72) Inventor Yuyuki Ikeda, 4-7-5, Oninohama, Otsu, Shiga OPTEX Corporation (72) Inventor Tetsuo Tanaka 4-7-5 Onohama, Otsu City, Shiga Prefecture Inside Optex Corporation (72) Inventor Takahiro Ohashi 4-7-5, Oninohama, Otsu City, Shiga Prefecture Optex Corporation (56) References JP-A-4-265960 (JP, A) JP-A-61-279837 (JP, A) JP-A-62-58231 (JP, A) JP-A-61-221731 (JP, A)

Claims (1)

(57) [Claims] 1. A plurality of sensors each having a sensor area set at a different location in an area to be monitored and detecting an object existing in the sensor area and outputting a detection signal; A camera rotatably mounted within a range to be covered, a position detection unit for detecting a current position in a rotation direction of the camera, and a sensor area where an object is present based on the detection signal output from any of the sensors. A sensor area discriminating means for discriminating, and a calculation for calculating a rotation direction and a rotation angle of the camera based on angle data preset for the sensor area discriminated by the sensor area discriminating means and the current position data of the position detecting unit. Means for driving a rotary drive source based on the calculated value to determine a camera angle of view of the camera by the sensor area determining unit. A monitoring imaging apparatus, comprising: rotation control means for performing rotation control so as to match the rear.