JPH03209993A - Monitor sensor by television screen and its use method - Google Patents

Abstract

PURPOSE:To execute a three-dimensional detection by photographing by a TV camera by setting plural position detecting points for displaying a dangerous area on a screen of a TV receiver with a light pen, and providing a sensor for detecting a moving image which comes into contact with these points on the screen. CONSTITUTION:A monitor TV 1 and plural TV cameras 2 are connected, and by the cameras 2, a dangerous area is photographed from the front, the side face, etc. The sensor is provided with a sensor circuit 9 for setting many dangerous area display points for displaying the area with a light pen 6, detecting them by a position detecting circuit 7, and detecting a moving image 8 which comes into contact therewith on a TV screen 3. In such a state, the light pen 6 contains a photoelectric converting element, and when its tip is put onto the screen 3, the photoelectric converting element senses an electron beam for forming a scanning beam, and its position is stored in a graphic RAM 18 by the circuit 7. When a variation is generated in density of a video signal which is scanning this stored position, an electric signal is generated, and in accordance with an output of a TV signal generating circuit 16, information synchronized with the contents of the RAM 18 raises an alarm 11, and received 20 by wire in other place.

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 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 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 that comes into contact with the television screen at the point, a television screen surveillance sensor comprising a plurality of television cameras, a television screen surveillance sensor comprising a television camera automatic switching circuit according to the invention described above. The first, second, third, and third cameras photograph a dangerous area from an oblique direction using a television screen-based surveillance sensor television camera according to the above-mentioned invention, each of which is equipped with a television-screen-based surveillance sensor alarm signal wireless transmission circuit according to the invention; Fourth
The present invention is constituted by the method of using a monitoring sensor using a television screen as described in the invention.

``Operation'' Therefore, a television camera 2 is placed at the scene and the scene is photographed on the screen 3 of the television 1. The television camera automatic switching circuit 1 changes the shooting angle by using a plurality of the cameras 2 mentioned above.
0 allows images from each camera 2 to be switched and displayed on the screen 3. 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 I and a plurality of television cameras 2 are connected, and the cameras 2 display a high-voltage power transmission line 12 and a steel tower 1 on the television screen 3.
3. Dangerous areas such as house walls 14 and platforms 15 4.
can be photographed. This dangerous area 4 should be photographed in front with one camera 2 (Figs. 3 and 5), and 2
Please use the camera 2.2 on the stand to take pictures of the front and sides (Fig. 4).
One camera 2 can three-dimensionally photograph the dangerous area 4 from the front, side, and a direction intersecting the plane, that is, from an oblique direction (FIGS. 9 and 10). 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 is equipped with a CRT (Ca
Use the light pen attached to the thod Ray Tube1 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, which is a scanning video signal, and the address 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 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 calculation 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. A display control circuit 17 extracts a synchronization signal from this television signal. By this synchronization signal, the calculation information in the address synchronized with the television scan is provided from the graphic RAM 18 to the alarm signal 11 and the scan conversion circuit 19. This scan conversion circuit 19
Then, a composite signal of the television signal and the calculation information is synchronized with the scan signal and displayed on the monitor television l.

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 one monitor television l and one control device, several cameras 2 can be connected. When several cameras 2 are used and simultaneous monitoring is performed, it is necessary to display the image of the camera that sensed the alarm on the monitor television 1, which is the automatic camera switching circuit 10. 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 first camera, the second camera is 4 times from the first camera.
The image is taken at a 5-degree angle, and the second camera 2 takes pictures of the front and side faces diagonally.In this way, it is possible to monitor both the bottom and the near and far, making it possible to monitor a three-dimensional surface. 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.

It will be done.

To set the address, Due to synchronization from the camera It is.

``Effects of the Invention'' The present invention is configured like a double series, so that a sensor area can be drawn at a necessary location while watching a television monitor, and if 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 a television camera, so sensors can be placed in three-dimensional areas anywhere that can be photographed by a television camera, such as in the sky, on the sea, or in dangerous areas. It can be installed in Conventionally, sensors were two-dimensional detection means that were installed on-site and detected there, but the device of the present invention does not install sensors on-site and detects movement using video images captured by a television camera. This makes dimensional detection possible.

BRIEF DESCRIPTION OF THE 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, and FIG. 3 is a usage state diagram of the sensor. Fig. 4 is a usage diagram using two cameras, Fig. 5 is a usage diagram of a wired connection between the camera and a TV, Fig. 6 is a side view of the dangerous area, and Figure 7 is a front view of the screen. Figure 8 is a distance display screen diagram of the danger area, Figures 9 and 10 are diagonal directions of the danger area.
0 l...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, lO.. TV camera automatic switching circuit, 11.. Alarm signal circuit.

Claims (1)

[Claims] (1) A position detection circuit comprising a television and a television camera, and capable of setting a plurality of sensor points with a light pen to display a dangerous area on the screen of the television, and touching the points on the television screen. A surveillance sensor using a TV screen and a sensor circuit that can detect moving images. (2) The television screen monitoring sensor according to claim (1), comprising a plurality of television cameras. (3) The television screen monitoring sensor according to claim (2), further comprising an automatic television camera switching circuit. (4) Claims (1), (2) or (2) comprising an alarm signal circuit.
3) Surveillance sensor using the TV screen as described. (5) The method of using a monitoring sensor using a television screen according to each of claims (1), (2), (3), or (4), wherein the dangerous area is photographed from an oblique direction with a television camera. (6) Claim (1) of photographing the dangerous area with a television camera
(2) How to use the monitoring sensor using a television screen as described in (3) or (4) respectively.