JPH0468990A - Television camera automatic monitor - Google Patents

Abstract

PURPOSE:To install a sensor in three-dimension anywhere when the range is within a scope of a television camera by drawing a sensor area for a required position while observing a television monitor and raising an alarm when an object touches with the drawn position. CONSTITUTION:A television camera 2 is arranged at a site to pick up an image onto a screen 3 of a monitor television receiver 1 and when a light pen 6 touches the screen 3 along a border of a danger area 4 at the site, plural sensor points 5 set a border on the screen 3. When a moving picture 8 of a moving object appearing on the screen 3 is in contact with the sensor points 5, a sensor circuit is activated and an alarm signal circuit 12 raises an alarm. Thus, a danger area is set to the screen on the television monitor 1 independently of distance, geographic shape and location to detect an object entering the area.

Description

DETAILED DESCRIPTION OF THE INVENTION [Prior Art] Conventionally, what is called a television monitoring system consists of a television camera and a monitor television, and a person monitors abnormalities while looking at the monitor screen. However, this system was labor-saving because it required a supervisor to monitor the monitor screen at all times. For this reason, systems are being adopted that do not require supervisors all the time, but instead check only when there is an abnormality. The feature of this system is that when it is combined with a sensor, when the sensor detects an image, the camera captures the scene and confirms it on the monitor. The above system is a very labor-saving system that requires a person to constantly look at the monitor screen, while the latter system is a labor-saving system that only displays the necessary images when the sensor is activated. It is a highly advanced system compared to the previous systems, as it is projected onto the screen and is viewed by humans only when there is an abnormality. However, the sensor used in the latter system is currently an infrared sensor, but there are problems with this sensor. The problem is that the infrared sensor is a straight line of light, and the transmitter and receiver are opposed to each other. Therefore, it is often impossible to detect the desired sensor area due to limitations such as the installation location, and there is also a limit to the distance that infrared rays can be transmitted at 2 to 300 meters.
Another problem is that the construction costs for sensor installation and wiring work are high.

``Problems to be Solved by the Invention'' The present invention is to set a dangerous area in a space on a television monitor regardless of distance, topography, or location, and to detect objects entering the area.

Also, the size of objects entering the area should be screened for small animals such as birds, dogs, cats, etc., and only humans and working machines that may affect the danger area should be detected.

An object of the present invention is to obtain an automatic television camera monitoring device that can warn of incoming objects, is easy to handle and move, and can save labor.

[Means for Solving the Problems] In order to achieve the above object, the present invention is equipped with a monitor television and a television camera, and a position detection device that can set a plurality of sensor points with a light pen to display a dangerous area on the screen of the television. and a sensor circuit capable of detecting a moving image touching the point on the television screen, the sensor circuit comprising a designating circuit for specifying the number of sensor points according to the size of the moving image. Automatic camera monitoring device The automatic television camera monitoring device according to the invention described above, wherein a monitor television, a position detection circuit, a sensor circuit, and a designation circuit are provided in one box.

Consisted of.

``Operation'' Therefore, a television camera 2 is placed at the scene and the scene is photographed on the screen 3 of the monitor television 1. By using a plurality of cameras 2, the photographing angle can be changed, and images from each camera 2 can be switched and displayed on the screen 3 by an automatic television camera switching circuit. When the light pen 6 is brought into contact with the screen 3 along the boundary of the hazardous area 4 of the scene, a plurality of sensor points 5 will set the said boundary on the screen 3. When the moving image 8 of the moving object appearing on the screen 3 comes into contact with the sensor point 5, the sensor circuit 9 operates and the alarm signal circuit 12 issues an alarm.

Even if a small animal such as a bird, a small bird, a dog, or a cat comes into contact with the plurality of sensor points 5, the sensor circuit 9 will not operate, so malfunctions caused by the small animal can be avoided.

The monitor television 1, the position detection circuit 7, the sensor circuit 9, and the designation circuit 10 are provided in one container 11, and can be moved and handled by one person using the one container 11.

"Example" A monitor television 1 and a plurality of television cameras 2 are connected, and the cameras 2 display a high-voltage power transmission line, a steel tower 14,
Dangerous areas 4 such as house walls and platforms can be photographed. This dangerous area 4 is photographed two-dimensionally from the front with one camera 2 (Fig. 4), and two cameras 2.2 are used to photograph the front and sides. Three-dimensional photography can be performed from the front, side, and a direction intersecting the plane, that is, from an oblique direction. A position detection circuit 7 (address detection circuit) capable of setting a large number of sensor points 5 displaying this area 4 with a light pen 6 is provided, and a sensor detects a moving image 8 touching the points 5 on the television screen 3. A circuit 9 is provided. The position detection circuit 7 includes a CRT (CRT) used as a computer terminal device.
Use the light pen attached to the Cathod RayTube1 display device.

The light pen 6 has a built-in photoelectric conversion element, so when the tip of the light pen 6 is placed on the TV screen 3, the photoelectric conversion element senses the scanning video signal, ie, the electron beam, and the position detection circuit 7 detects the electron beam. The positions are stored in a matrix arrangement in graphics RAM. If a change in density of the video signal being scanned occurs at this stored position, it is detected as an analog electrical signal by an analog-to-digital conversion circuit. Due to the functionality of the sensor, it would be a problem for the device to detect clouds, rain, snow, etc. Therefore, in order to incorporate only a certain analog amount as a sensor signal, it is selected by an arithmetic circuit. A video is captured by a television camera 2, and is generated from a television signal generation circuit as a television signal in which a video signal, a synchronization signal, etc. are combined. A synchronization signal is extracted from this television signal by a display control circuit. By this synchronization signal, the arithmetic information in the address synchronized with the television scan is provided from the graphic RAM to the alarm signal circuit 12 and the scan conversion circuit. In this scan conversion circuit, a composite signal of the television signal and the calculation information is synchronized with the scan signal and displayed on the monitor television 1. The alarm signal circuit 12 notifies the device itself with an alarm buzzer and alarm lamp, but also transmits the alarm with an alarm radio transmitter 15 built into the device.
is an alarm receiver. This alarm receiver 16 can detect alarms even if it is far away from the device. Further, any number of the same alarm receivers 16 can be added.

There is one monitor TV 1 and one control device, but the camera 2
You can connect several devices. When several cameras 2 are used and simultaneous monitoring is performed, it is necessary to display the image 3 of the camera 2 that has detected the alarm on the monitor television 1, which is an automatic camera switching circuit. The video signal captured by the camera 2 is displayed as an image on the monitor television 1, but since the image is displayed on a surface, the distance cannot be seen.Therefore, although vertical movement can be detected, the distance cannot be seen. Use the second camera.The second camera takes images at a 45 degree angle from the first camera.The second camera 2 takes images from the front and sides diagonally. Since it can monitor both near and far, it is possible to monitor three-dimensional surfaces. The circuit can also be a system circuit that issues an alarm only when the two cameras 2 sense the same point.

However, the devices described above are subject to malfunctions. For example, even if the intrusion of only humans is automatically monitored, if a dog or bird touches the sensor point 5, the pressure will naturally be detected.It is desirable to have a method that detects only humans and does not detect when dogs or birds touch. In other words, 3328 sensor points 5 are set on the screen 3 of the monitor TV, but the sensor points 5 can be set using AND, and even if a moving object touches one point, it can be detected, but the size of the detected object The number of sensor points 5 can be specified depending on the situation. For example, if a human moves 10 points at a time, specify 10 points if only humans are detected, and small animals such as dogs and birds will not be detected. This designation circuit 10 can be adjusted using a sensor point designation dial 10'. Additionally, when monitoring outdoors, clouds, smoke, etc. may enter the video area and cause malfunctions, so the camera is equipped with a device to prevent this. Image processing detects density differences in video scanning, but by adjusting this density difference, clouds, smoke, etc. can no longer be detected.

That is, it can be adjusted using the density difference adjustment dial 17'.

The position detection circuit 7, the sensor circuit 9, the designation circuit 10, the concentration adjustment circuit 17, etc. are housed inside the chamber 11 housing the monitor television. In addition, such a detection device may not be noticed even if the coaxial cable 13 from the camera 2 is disconnected, the connector 18 is loose, or an abnormality in the internal circuit occurs, and the device is used as is, resulting in inconvenience because it does not work when needed. In most cases, the failure detection circuit shown in FIG. 5 detects a drop in the video level7, thereby detecting the failure. It also includes a radio transmitter 15 and a radio receiver 16 that detect a moving object from the television image and notify the moving object as information.
Figure 3).

[Effect of the Invention J] Since the present invention is configured as described above, a sensor area is drawn at a necessary location while viewing the television monitor l, and when an object touches the drawn location, an alarm can be issued. With this device, a sensor area can be created anywhere that can be photographed by TV camera 2, so sensors can be placed anywhere that television camera 2 can photograph, such as in the sky, on the sea, or in dangerous areas, where sensors could not be installed until now. Can be set up dimensionally. Conventionally, a two-dimensional detection method was used in which sensors were installed at the site and detected there, but the device of the present invention does not require any sensors to be installed at the site.
It is possible to perform three-dimensional detection of motion in a video image using flt. This also has the effect of preventing malfunctions caused by small animals such as birds, dogs, and cats.

Furthermore, the single container 11 facilitates handling and transportation, and saves labor in installing the monitor television.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the automatic television camera monitoring device of the present invention, FIG. 2 is a rear view of the device, FIG. 3 is a block diagram of the device, FIG. 4 is a front view of a monitor TV screen, and FIG. The figure is a block diagram including a failure detection circuit, and FIG. 6 is a rear view of the control unit separated from the monitor television. 1...Monitor TV, 2...TV camera, 3...Screen, 4...Dangerous area, 5...Sensor point, 6...Light Ben, 7...Position detection circuit, 8...Moving image, 9... Sensor circuit, ]0...Specified circuit, 11...Inside the device.

Claims (2)

[Claims] (1) Equipped with a monitor TV and a TV camera, a position detection circuit that can set multiple sensor points with a light pen to display a dangerous area on the TV screen, and detects a moving image that touches the points on the TV screen. 1. An automatic television camera monitoring device, which comprises a sensor circuit that can be moved, and a designation circuit that designates the number of sensor points in accordance with the size of a moving image. (2) The automatic television camera monitoring device according to claim (1), wherein the monitor television, the position detection circuit, the sensor circuit, and the designation circuit are provided in one box.