JP2004159254A - Sensor camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a suitable supervisory image by a supervisory camera and a suitable detection sensitivity of a passive IR sensor according to the mounting height and the supervisory distance. <P>SOLUTION: The camera comprises an adjustable mechanism which shifts the relative position of a supervisory area of a passive IR sensor included in a supervisory image downwards on the supervisory image, as the supervisory direction of the camera changes from a remote area supervising state including the ceiling, to a near area supervising state including the floor surface just below. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sensor camera in which a surveillance camera and a passive infrared sensor are housed in the same case, and to a direction adjustment mechanism for the surveillance camera and the passive infrared sensor in the case.
[0002]
[Prior art]
A device in which a surveillance camera and a passive infrared sensor are integrated has been put to practical use. For example, Japanese Patent Application Laid-Open No. 7-147647 discloses an apparatus including a camera, illumination, and a heat ray sensor (passive infrared sensor). Is disclosed. In this device, the entire case is connected to a mounting member via a joint that can adjust the angle, and the relative position between the camera and the passive infrared sensor is maintained regardless of the direction in which the angle is adjusted and the case is turned. It was unchanged.
[0003]
[Problems to be solved by the invention]
The sensor camera has a function of photographing a monitoring area and outputting a video signal thereof, and a function of detecting a person who has entered the monitoring area and outputting a detection signal thereof. When a person who has intruded into the monitoring area is detected, a method of activating a camera and photographing an intruder is also common. For this reason, the shooting range of the camera and the monitoring area of the passive infrared sensor need to match. The monitoring area of the passive infrared sensor, which is called a three-dimensional alert, is constituted by a plurality of detection zones having a maximum extent of about 85 ° in the horizontal (left / right) direction and a maximum of about 60 ° in the vertical (vertical) direction. When cameras with a horizontal angle of view of about 90 ° are overlapped in accordance with the direction of the surveillance area having such a spread, the aspect ratio of the current general CRT image becomes 3 Since there is a ratio of 4, the vertical angle of view that the camera can shoot is about 70 °.
[0004]
In the horizontal direction, the surveillance area of the passive infrared sensor fits in the surveillance image of the camera almost in the same manner, but in the vertical direction, the angle of view of the surveillance image of the camera is higher than that of the passive infrared sensor. Is larger than the angle of spread of the monitoring area by about 10 °, and an insensitive area of the passive infrared sensor is generated on the monitoring image.
[0005]
FIG. 1 is a side view of a conventional sensor camera, showing the surveillance area and the spread of the angle of view of a surveillance image as viewed from the side. FIG. 1A shows a state where a sensor camera is installed in a room having a ceiling height H of about 2 meters and a monitoring distance L of about 10 meters. P indicates the vertical spread angle of the surveillance area of the passive infrared sensor, G indicates the vertical spread angle of the angle of view of the surveillance camera, and P is fixed substantially at the center of G. The camera is set so as to capture an image from below the ceiling surface, and at this time, the uppermost part of the monitoring area P of the sensor has reached the part of the human head at the farthest position. In this state, no matter what part of the area photographed by the camera is moved by a person, the person surely crosses the monitoring area of the passive infrared sensor and can output a detection signal.
[0006]
FIG. 1B shows a state where the sensor camera is installed in a room where the ceiling height H is about 4 meters and the monitoring distance L is about 5 meters. The camera is set to shoot upward from the floor directly below, and the uppermost part of the monitoring area P of the sensor reaches above the part of the human head at the farthest position. As in the state shown in FIG. 1A, P is fixed substantially at the center of G. In this state, no matter what part of the area captured by the camera, a person moves around, and cannot reliably cross the monitoring area of the passive infrared sensor.For example, just below the sensor camera However, the human being there is photographed by the camera, but since there is no detection band, a situation arises in which the human being is not detected by the passive infrared sensor. Further, since the uppermost part of the monitoring area P of the sensor reaches above the part of the head of the person at the farthest position, the human does not cross the detection band existing at the uppermost part of the monitoring area P. As a result, humans are less likely to be detected. In other words, the possibility exists that a person at the farthest position or a person at the closest position (immediately below) cannot be detected. As described above, the conventional sensor camera has a problem that the detection ability is not sufficiently exhibited depending on the installation conditions.
[0007]
[Means for Solving the Problems]
In order to eliminate such inconvenience, when the monitoring direction of the camera is changed from the state of distant monitoring including the ceiling to the state of near monitoring including the floor immediately below, the passive infrared sensor included in the monitoring image is changed. An adjustment mechanism is provided such that the relative position of the monitoring area is displaced downward in the monitoring image.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 2 is a side view of a sensor camera according to the present invention, showing a surveillance area and a spread of an angle of view of a surveillance image as viewed from a side. FIG. 2A shows a state where the sensor camera is installed in a room where the ceiling height H is about 2 meters and the monitoring distance L is about 10 meters. P indicates the vertical spread angle of the surveillance area of the passive infrared sensor, and G indicates the vertical spread angle of the angle of view of the surveillance camera. In this state, P is disposed substantially at the center of G. I have. The camera is set so as to capture an image from below the ceiling surface, and at this time, the uppermost part of the monitoring area P of the sensor has reached the part of the human head at the farthest position. In this state, no matter what part of the area photographed by the camera is moved by a person, the person surely crosses the monitoring area of the passive infrared sensor and can output a detection signal.
[0009]
FIG. 2B shows a state where the sensor camera of the present invention is installed in a room where the ceiling height H is about 4 meters and the monitoring distance L is about 5 meters. The camera is set to shoot upward from the floor directly below, and the top of the monitoring area P of the sensor reaches the part of the human head at the farthest position. Unlike the state of FIG. 2A, P is displaced below G. In this state, no matter what part of the area photographed by the camera is moved by a person, the person surely crosses the monitoring area of the passive infrared sensor and is sufficiently detected by the passive infrared sensor. Also, since the top of the monitoring area P of the sensor reaches the head of the human being at the farthest position, the human crosses the detection band existing at the top of the monitoring area P, The state of sufficiently detecting humans is maintained. In other words, a state where appropriate sensitivity is obtained in the entire monitoring area including the person at the farthest position and the person at the closest position (directly below) is maintained.
[0010]
FIG. 3 is a diagram schematically showing the internal mechanism of the sensor camera of the present invention, and is a cross-sectional view as viewed from the side. A passive infrared sensor 1 having a vertical extension P of a monitoring area and a surveillance camera 2 having a vertical extension G of an angle of view of a monitoring screen can be rotated up and down around different rotation axes. It is attached in a state. A grooved cam disk 3 in which a pin 11 provided on the passive infrared sensor 1 and a pin 21 provided on the monitoring camera 2 are rotatably mounted between the passive infrared sensor and the monitoring camera 2. Are connected so as to be located in the grooves 31 and 32.
[0011]
The rotating shafts of the passive infrared sensor 1, the surveillance camera 2, and the grooved cam disk 3 are supported by a support mechanism (not shown) fixed to the base 4 side. Covered by FIG. 3A shows a state in which the monitoring camera 2 is set so as to capture an image from below the ceiling surface, that is, a state of FIG. 2A, and FIG. 2B shows a state in which the camera is set to capture an image from above the surface, that is, a state shown in FIG. 2B.
[0012]
When the monitoring camera 2 is rotated downward (counterclockwise) from the state shown in FIG. 3A, the pin 21 rotates the grooved cam disk 3 clockwise, and the grooved cam disk 3 further rotates the pin 11 When rotated in a counterclockwise direction, the passive infrared sensor 1 rotates downward. The distance between the rotation center of the passive infrared sensor 1 and the pin 11, the distance between the rotation center of the monitoring camera 2 and the pin 21, the distance between the rotation center of the groove cam disk 3 and the pin 11, the rotation center of the groove cam disk 3 The distance between the pins 21 is appropriately adjusted, and the rotation angle of the passive infrared sensor 1 that rotates during the period from the state shown in FIG. 3A to the state shown in FIG. Is larger. Such a rotation mechanism is disclosed in an adjustment mechanism for an alarm device (JP-A-2000-235679) previously filed by the present inventors.
[0013]
【The invention's effect】
According to the present invention, as the monitoring direction of the monitoring camera is changed from a state of monitoring a distant place to a state of monitoring a nearby place, the relative position of the monitoring area of the passive infrared sensor included in the monitoring image is changed. The camera is equipped with an adjustment mechanism that automatically displaces downward in the monitoring image, so that the monitoring image of the appropriate monitoring camera and the detection sensitivity of the appropriate passive infrared sensor according to the mounting height and the monitoring distance are provided. Can be obtained.
[0014]
In addition, since it is not necessary to individually adjust the monitoring direction of the monitoring camera and the direction of the monitoring area of the passive infrared sensor, the adjustment time at the time of installation and subsequent maintenance is reduced. As described above, the present invention solves the drawbacks of the conventional device in which the sensor and the camera are housed in the same container, and realizes the improvement of the basic performance and the operability of the sensor camera at the same time.
[Brief description of the drawings]
FIG. 1 is a side view of a conventional sensor camera, showing a surveillance area and a spread of an angle of view of a surveillance image as viewed from a side.
FIG. 2 is a side view of a sensor camera according to the present invention, showing a surveillance area and a spread of an angle of view of a surveillance image as viewed from a side.
FIG. 3 is a view schematically showing an internal mechanism of the sensor camera of the present invention.
[Explanation of symbols]
H: ceiling height L: surveillance distance P: vertical spread angle of the surveillance area of the passive infrared sensor G: vertical spread angle of view angle of the surveillance camera 1: passive type Infrared sensor 2 Surveillance camera 3 Groove cam disk 4 Base 5 Covers 11 and 21 Pins 31 and 32 Grooves

Claims (1)

A device provided with a monitoring camera and a passive infrared sensor, wherein a state in which the monitoring image of the monitoring camera includes all the monitoring areas of the passive infrared sensor is always maintained, and the monitoring direction of the monitoring camera is However, due to the downward rotation, the state is changed from a state of monitoring a distant place to a state of monitoring a nearby place, and the relative position of the monitoring area of the passive infrared sensor included in the monitoring image is monitored. A sensor camera comprising an adjustment mechanism for displacing downward in an image.

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