JP2580364B2 - Image recording and playback device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image recording / reproducing apparatus applied to a monitoring apparatus for monitoring an abnormality of various devices in a facility such as a factory, an intrusion of a suspicious person or an animal, and the like. Things.

(Prior Art) As a monitoring device in a facility such as a factory, there is a device using a conventional industrial television (ITV). For example, as shown in FIG. 3, this apparatus displays an image c of a monitoring target b from a camera a on a display means d such as a CRT, and a monitor observes the image c to monitor for abnormalities and displays the image c. c is recorded in a recording / reproducing means e such as a VTR, and when an abnormality occurs, the image c at that time is reproduced to determine the location of the abnormality and the content of the abnormality.

(Problems to be Solved by the Invention) In such a conventional monitoring apparatus, since one recording / reproducing means is used for one camera, when the monitoring range is widened and the number of cameras is increased, the number of cameras increases. As a result, the number of recording / reproducing means must be increased, so that the entire apparatus becomes very large and costly.

An object of the present invention is to solve such a conventional problem.

(Means for Solving the Problems) In order to solve the above problems, an abnormality monitoring device according to the present invention includes a plurality of cameras, a multiplexer for multiplexing image signals from the plurality of cameras, and an output of the multiplexer. Image recording / reproducing means for recording / reproducing an image signal over time;
Control means for issuing a switching signal to the multiplexer in synchronization with image recording in the image recording / reproducing means, and for recording the identification signal corresponding to the switched camera together with the image signal in the image recording / reproducing means; An image selection / output unit that extracts the identification signal from the reproduction signal of the image recording / reproduction unit, selects only an image signal corresponding to a preset identification signal, and outputs the selected image signal to a display unit. A video tape recorder of a helical scan system for recording an image signal for one field and an identification signal on one track, wherein the control means inputs a signal synchronized with the rotation of a recording head for each track of the video tape recorder. The switching signal is generated.

(Operation) In the above configuration, the image signals from the plurality of cameras are sequentially switched by the multiplexer controlled by the control means and input to the image recording / reproducing means, and are recorded on the recording tape together with the identification signal corresponding to the switching. Recorded over time.

At this time, the switching signal is generated in synchronization with the rotation of the recording head for each track of the recording tape, that is, switching of image signals from a plurality of cameras in the multiplexer is performed by recording an image for each track. Therefore, one field of the image signal from each camera is sequentially and reliably recorded for each track of the video tape recorder together with the identification signal.

If the image recorded in this way is simply reproduced and displayed on the display means over time, images from a plurality of cameras are displayed in an overlapping manner. Virtually not at all.

However, in the present invention, the image selection output means
An identification signal reproduced together with the image is extracted, and only an image having an identification signal corresponding to a preset signal such as a camera number is selected and output to the display means.

Therefore, only the image of the camera corresponding to the setting signal such as the camera number can be displayed on the display means.

Thus, according to the present invention, it is possible to reliably and efficiently record images from a plurality of cameras with a single video tape recorder, and to configure a monitoring device for monitoring a wide area in a factory or the like at a small size and at a low cost. can do.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the present invention, and reference numeral 1 (1a, 1b, 1c,..., 1n) indicates a camera. A plurality of cameras 1 are provided corresponding to a monitoring area such as a factory. These image signals from the camera 1 are input to the respective input units of the multiplexer 2. The output of the multiplexer 2 is input to the image recording / reproducing means 3. The image recording and reproducing means 3 is configured to record and reproduce the output image signal of the multiplexer 2 with time. The image recording / reproducing means 3 is configured using a helical scan video tape recorder. Reference numeral 4 denotes control means. The control means 4 issues a switching signal 5 to the multiplexer 2 in synchronization with image recording in the image recording / reproducing means 3 and an appropriate identification signal corresponding to the switched camera 1. 6 together with the image signal 7
Is recorded. That is, since a video tape recorder is used as the image recording / reproducing means 3, the switching signal 5 is generated by inputting a signal synchronized with the rotation of the recording head for each track in the control means 4. In response to the switching signal 5, an identification signal corresponding to each camera, such as a number, is output to the image recording / reproducing means 3. One track of the image signal 7 from the camera 1 is output to one track.
The configuration is such that the field portion and the identification signal 6 are recorded. The identification signal 6 can be recorded at an appropriate position on the track. Reference numeral 8 denotes an image selection and output unit. The image selection and output unit 8 extracts the identification signal 6 from the reproduction signal of the image recording / reproduction unit 3 and outputs only the image signal 7 corresponding to the identification signal 6 set in advance. Is selected and output to the display means 9 such as a CRT.

In the above configuration, a plurality of cameras 1 (1a, 1b, 1c,...,
The image signals A, B and C from 1n) are sequentially switched by the multiplexer 2 controlled by the control means 4 and input to the image recording / reproducing means 3, and together with the identification signal 6 corresponding to this switching, as shown in FIG. As shown, the data is recorded on the recording medium 10 over time. Therefore, when the image recorded in this way is simply reproduced and displayed on the display means 9, the plurality of cameras 1 (1a, 1a) are displayed.
b, 1c,..., 1n) are displayed in an overlapping manner.
Virtually not at all.

However, the image selection and output means 8 extracts the identification signal 6 reproduced together with the image signal 7 and selects only the image signal having the identification signal 6 corresponding to a preset setting signal such as a camera number. Output to display means 9. That is,
If there are N cameras 1, the image selection output means 8
An image signal 7 corresponding to each field sequentially recorded on the recording medium 10 is output to the display means 9 every N signals.
Therefore, only the image of the camera 1 corresponding to the setting signal such as the camera number can be displayed on the display unit 9.

Thus, the present invention provides a plurality of cameras 1 (1a, 1b, 1c,.
For n), only one recording / reproducing means 3 is sufficient, and a monitoring device for monitoring a wide area in a factory or the like can be configured at a small size and at low cost.

(Effects of the Invention) As described above, according to the present invention, image signals from a plurality of cameras are stored in a VTR as an image recording / reproducing means, and one field of an image signal from each camera and an identification signal are sequentially recorded for each track. Since recording is performed, image signals of a plurality of cameras can be efficiently recorded on a recording tape. Since only the image corresponding to the specific camera is selected from the images recorded over time and displayed on the display means, one recording / reproducing means can be used for a plurality of cameras. ,
Therefore, there is an effect that a monitoring device for monitoring a wide area in a factory or the like can be configured in a small size and at low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing the configuration of the present invention as a block diagram, FIG. 2 is a schematic explanatory diagram showing an image recording state on a recording medium of an image recording / reproducing means, and FIG. FIG. Reference numeral 1 (1a, 1b, 1c,..., 1n)... Camera, 2... Multiplexer, 3.
... Switching signal, 6 ... Identification signal, 7 ... Image signal, 8 ...
... image selection output means, 9 ... display means, 10 ... recording medium.

Claims (1)

(57) [Claims] 1. A plurality of cameras, a multiplexer for multiplexing and outputting image signals from the plurality of cameras, an image recording / reproducing means for recording / reproducing output image signals of the multiplexer with time, and the image recording / reproducing. Control means for issuing a switching signal to the multiplexer in synchronization with image recording in the means, and for recording the identification signal corresponding to the switched camera together with the image signal in the image recording / reproducing means; An image selection / output unit for extracting the identification signal from the reproduction signal, selecting only an image signal corresponding to a preset identification signal, and outputting the selected image signal to a display unit. A helical scan type video tape recorder for recording a field portion and an identification signal on one track; Image recording and reproducing apparatus being characterized in that the arrangement for generating the switching signal by inputting a signal synchronized with the rotation of the recording head of each track loaders