JPH0427759B2 - - Google Patents

Description

[Detailed Description of the Invention] "Prior Art" Conventionally, what is called a television surveillance system is
Consists of a TV camera and a monitor TV.
A human was watching the monitor screen for abnormalities. 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, and only check when an abnormality occurs. 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. This system is very advanced compared to the previous systems because the images are projected onto the screen and people only see it 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,
It is a single line of light, and it is a pair of light transmitter and light receiver facing each other. Therefore, it is often impossible to detect the desired sensor area due to limitations such as installation location. Another problem is that there is a limit to the distance that infrared rays can be transmitted, at 2 to 300 meters, and that construction costs such as sensor installation and wiring work are expensive.

``Problems to be Solved by the Invention'' The present invention aims 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.

"Means for Solving the Problems" In order to achieve the above object, the present invention provides a position detection circuit that is equipped with a television and a television camera, and is capable of setting a plurality of sensor points using a light pen to display a dangerous area on the screen of the television. and a sensor circuit capable of detecting a moving image that touches the point on the television screen.A television screen surveillance sensor according to the invention described above, which is equipped with a plurality of television cameras.The television screen surveillance sensor is equipped with a television camera automatic switching circuit. Surveillance sensor using a television screen according to the invention; Surveillance sensor using a television screen according to each of the inventions described above, which is equipped with an alarm signal wireless transmission circuit. 4. Method of using the surveillance sensor using a television screen according to the invention.
It is constituted by the method of using a monitoring sensor using a television screen according to the second, third, and fourth inventions.

"Operation" Therefore, a television camera 2 is placed at the scene and the scene is photographed on the screen 3 of the 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 the automatic television camera switching circuit 10. 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 an alarm signal circuit 11 issues an alarm.

"Example" A monitor television 1 and a plurality of television cameras 2 are connected, and the cameras 2 photograph dangerous areas 4 such as high-voltage power lines 12, steel towers 13, house walls 14, and platforms 15 on the television screen 3. be able to.
This dangerous area 4 is photographed two-dimensionally from the front with one camera 2 (Figs. 3 and 5), and two cameras 2,
2 to take pictures of the front and sides (Fig. 4), and one camera 2 can take three-dimensional pictures of the dangerous area 4 from the front, sides, and a direction intersecting the plane, that is, from an oblique direction (Fig. 9). , Figure 10). A light pen 6 displays a number of sensor points 5 indicating this area 4.
A sensor circuit 9 detects a moving image 8 touching the point 5 on the television screen 3.
is provided. The position detection circuit 7 is equipped with a CRT (Cathode CRT) used as a computer terminal device.
Ray Tube) Use the light pen attached to the 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 electron beam that is the scanning video signal, and the address detection circuit 7 detects the electron beam. , its position is stored in a matrix layout in graphics RAM. If a change in the density of the video signal being scanned occurs at this stored position, it is detected as an analog electrical signal by the analog-to-digital conversion circuit. Due to the function of the sensor, it is a problem for the device to detect clouds, rain, snow, etc. Therefore, in order to take in only a certain analog amount as a sensor signal, it is selected by the arithmetic circuit 7'. The video is captured by the television camera 2, and is generated from the television signal generation circuit 16 as a television signal in which a video signal, a synchronization signal, etc. are combined. This television signal is transmitted to the display control circuit 17.
The synchronization signal is extracted. This synchronization signal causes the graphic RAM 18 to provide the above calculation information in the address synchronized with the television scan to the alarm signal 11 and the scan conversion circuit 19. In the scan conversion circuit 19, 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 11 is notified by the alarm buzzer and alarm lamp in the device itself, but the alarm is transmitted by an alarm radio transmitter built into the device, 20 is an alarm receiver.
This alarm receiver can detect alarms even if it is far away from the device. Also, you can add as many alarm receivers as you like. Although there is only one monitor television 1 and one control device, several cameras 2 can be connected. When using several cameras 2, it is necessary to display the image of the camera that detected the alarm on the monitor TV 1 because they are being monitored simultaneously.This is the automatic camera switching circuit 1.
It is 0. 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, perspective cannot be seen. Therefore, although vertical movement can be detected, distance cannot be seen. Therefore, a second camera is used, the second camera takes the image at a 45 degree angle from the first camera, and the second camera 2 captures the front and side views from an angle. Since it can monitor up and down and near and far, it can monitor three-dimensional surfaces. The circuit also includes a system circuit that issues an alarm only when the two cameras 2 sense the same point.

Another embodiment of the present invention will be described with reference to FIG. 11.

The sensor area is set using a light pen that can touch the TV monitor. Similar to the previous embodiment, the light pen is equipped with a photoelectric conversion element,
When the pen is pressed onto the monitor screen, an electron beam is sensed. Then, the signal from the pen is stored in the marker RAM by the key switch and referred to.

The address is set by an internal counter synchronized with the camera, and by installing 64 horizontal and 52 vertical dot sensor points on the monitor. The video signal on this sensor point is constantly A/D converted (approximately 1 μS) via a level limiter. Then, when the video signal density (64 steps because 6-bit A/D conversion is performed) at the address where the marker is displayed changes, the data previously written in the ROM is set by the level limiter level switch. It is sent to the alarm circuit side in accordance with the stage (8 stages depending on the combination of ON and OFF of the 3 level switches).

"Effects of the Invention" Since the present invention is configured as described above, a sensor area can be drawn at a necessary location while watching a television monitor, and an alarm can be issued when an object touches the drawn location. With this device, a sensor area can be created anywhere that can be photographed by a TV camera, so it is possible to create a sensor area anywhere that can be photographed by a TV camera.
Sensors can be installed three-dimensionally anywhere that a TV camera can capture, such as in the sky, on the sea, or in dangerous areas. Conventionally, sensors were two-dimensional detection means that were installed at the site and detected there, but the device of the present invention does not install any sensors on the site, but detects movement using video images captured by a television camera. This makes three-dimensional detection possible.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a television screen monitoring sensor according to an embodiment of the present invention, Fig. 2 is a perspective view of the sensor, Fig. 3 is a usage state diagram of the sensor, and Fig. 4 shows two cameras. Usage state diagram using
Figure 5 is a usage diagram of the wired connection between the camera and TV, Figure 6 is a side view of the dangerous area, Figure 7 is a front view of the screen, Figure 8 is a distance display screen of the dangerous area, and Figure 9 is 1 and 10 are oblique photographic screen views of a dangerous area, and FIG. 11 is a block diagram showing a monitoring sensor using a television screen according to another embodiment of the present invention. 1...TV, 2...TV camera, 3...Screen, 4
…Dangerous area, 5…Sensor point, 6…Light pen,
7... Position detection circuit, 8... Moving image, 9... Sensor circuit, 10... Television camera automatic switching circuit, 11...
Alarm signal circuit.

Claims (1)

[Claims] 1. A position detection circuit comprising a television and a television camera, and a position detection circuit capable of setting a plurality of sensor points with a light pen to display a danger area on the screen of the television, and a moving device that contacts the points on the television screen. A surveillance sensor that uses a television screen and consists of a sensor circuit that can detect images. 2. The television screen monitoring sensor according to claim 1, comprising a plurality of television cameras. 3 Claim 2 comprising an automatic television camera switching circuit
Surveillance sensor by TV screen as described. 4. The television screen monitoring sensor according to claim 1, 2 or 3, comprising an alarm signal circuit. 5. The method of using a monitoring sensor using a television screen according to claim 1, 2, 3 or 4, wherein the dangerous area is photographed from an oblique direction with a television camera. 6. A method of using the monitoring sensor using a television screen according to claim 1, 2, 3 or 4, wherein the hazardous area is photographed with a television camera.