JPH0416086A - Picture recording and reproducing device - Google Patents

Abstract

PURPOSE:To employ only one recording and reproducing means enough for plural cameras by multiplexing a picture signal from plural cameras, recording the signal by a picture recording and reproducing means secularly and extracting and displaying only the picture corresponding to a specific camera among recorded pictures. CONSTITUTION:Picture signals A, B, C from plural cameras 1 (1a, 1b, 1c,..., 1n) are sequentially switched by a multiplexer 2 controlled by a control means 4 and inputted to a picture recording and reproducing means 3 and recorded on a recording medium 10 with the passage of time. A picture selection output means 8 outputs a picture signal 7 corresponding to each field recorded sequentially on the recording medium 10 to a display means 9 for each of N set of the cameras. Thus, only a picture corresponding to a specific camera 1 in response to the setting signal of a camera number or the like is displayed on the display means 9.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image recording and reproducing device that is applied to a monitoring device that monitors abnormalities in various devices in facilities such as factories, intrusion of suspicious persons and animals, etc. It is something.

(Prior Art) As a monitoring device in facilities such as factories, there is a device using a conventional industrial television (CITV). For example, as shown in Fig. 3, this device displays an image C of the object to be monitored from a camera a on a display means d such as a CR, T, etc. 1, and a supervisor looks at the image C and monitors for abnormalities. , that image C is from a VTR
etc., and when an abnormality occurs, the image C at that time is reproduced to determine the location where the abnormality has occurred and the details of the abnormality.

(Problem to be Solved by the Invention) In conventional monitoring devices like this, one recording and reproducing means is used for - cameras, so when the monitoring range becomes wider and the number of cameras increases, the number of cameras increases. Therefore, the number of recording and reproducing means must be increased, making the entire apparatus very large-scale and increasing the cost.

The present invention aims to solve such conventional problems.

(Means for Solving the Problems) In order to solve the above problems, the abnormality monitoring device of the present invention includes a plurality of cameras, a multiplexer that multiplexes image signals from the plurality of cameras, and an output of the multiplexer. an image recording and reproducing means for recording and reproducing image signals over time; and a switching signal to the multiplexer in synchronization with image recording in the image recording and reproducing means, and an identification signal corresponding to the switched camera to be transmitted to the image signal. At the same time, a control means for causing the image recording and reproducing means to record, and a control means for extracting the identification signal from the reproduction signal of the image recording and reproducing means, selects only the image signal corresponding to the preset identification signal, and outputs it to the display means. and image selection output means.

In the above configuration, the image recording and reproducing means utilizes a helical scan type video tape recorder, and the switching signal is generated for each track in synchronization with the rotation of the head.
It is possible to have a configuration in which one field of image signals from the camera and an identification signal are recorded on the one track.

(Function) In the above configuration, image signals from multiple cameras are
The signals are sequentially switched by a multiplexer controlled by the control means and input to the image recording/reproducing means, and are recorded over time on a recording medium together with an identification signal corresponding to the switching. Therefore, if images recorded in this way are simply played back and displayed on a display means, images from multiple cameras will be displayed overlapping each other, making it virtually impossible to visually recognize images corresponding to a specific camera. I can't do it at all.

However, in the present invention, the image selection output means extracts the identification signal reproduced together with the image and selects only the images having the identification signal corresponding to the setting signal such as a preset camera number. Output to 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, only one recording/reproducing means is required for a plurality of cameras, and a monitoring device that monitors a wide area in a factory or the like can be constructed in a small size and at a low cost.

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

FIG. 1 shows the configuration of the present invention as a block diagram, and reference numeral 1 (la, lb, lc, -, in) indicates a camera. A plurality of cameras l are configured to correspond to monitoring areas of factories and the like. The image signals of these cameras 1 are input to each input section of a multiplexer 2. The output section of the multiplexer 2 is configured to input to the image recording/reproducing means 3. and,
The image recording and reproducing means 3 is configured to record and reproduce the output image signal of the multiplexer 2 over time.

For example, the image recording and reproducing means 3 is configured using a helical scan type video tape recorder. Reference numeral 4 denotes a control means, and the second control means 4 issues a switching signal 5 to the multiplexer 2 in synchronization with image recording in the image recording and reproducing means 3, and also outputs an appropriate identification signal corresponding to the switched camera 1. The configuration is such that the signal 6 is recorded in the image recording/reproducing means 3 together with the image signal 7. For example, when the image recording and reproducing means 3 is configured using a video tape recorder, the switching signal 5 is generated in this control means 4 in synchronization with the rotation of the recording head for each track, and In response to the switching signal 5, an identification signal such as a number corresponding to each camera is output to the image recording/reproducing means 3, and one field of the image signal 7 from the camera l and the identification signal 6 are stored in one track. The configuration is to record. An identification signal 6 can be recorded in place on said track. Reference numeral 8 is image selection output means;
This image selection output means 8 extracts the identification signal 6 from the reproduction signal of the image recording and reproduction means 3, selects only the image signal 7 corresponding to the preset identification signal 6, and outputs the image to the CRT.
The configuration is such that the information is output to a display means 9 such as the following.

In the above configuration, a plurality of cameras 1 (la.

Image signals A and B from 1b, lc, ---, ln).

C is sequentially switched by the multiplexer 2 controlled by the control means 4 and inputted to the image recording/reproducing means 3, and together with the identification signal 6 corresponding to this switching, is transferred to the recording medium 10 over time as shown in FIG. recorded. Therefore, when the images recorded in this way are simply reproduced and displayed on the display means 9, a plurality of cameras l (la, lb, lc,
.=In) are displayed overlapping each other, so it is virtually impossible to visually recognize the image corresponding to a specific camera 1.

However, the image selection 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. It is output to the display means 9. That is, when there are N cameras 1, the image selection output means 8 outputs every N image signals 7 corresponding to each field sequentially recorded on the recording medium 10 to the display means 9.

Therefore, only the image of the camera 1 corresponding to the setting signal such as the camera number can be displayed on the display means 9.

Thus, the present invention provides a plurality of cameras 1 (la, 1
b, lc, .
It can be constructed in a small size and at low cost.

(Effects of the Invention) As described above, the present invention multiplexes image signals from a plurality of cameras and records them over time by an image recording and reproducing means, and also allows the multiplexed image signals to be recorded over time. Since only the images corresponding to a specific camera are selected and displayed on the display means, only one recording and reproducing means is required for multiple cameras, and therefore the monitoring device can be used to monitor a wide area in factories, etc. This has the advantage that it can be constructed in a small size and at low cost.

[Brief explanation of 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 the recording state of an image on a recording medium of an image recording/reproducing means, and Fig. 3 is an explanatory diagram of a conventional example. It is an explanatory diagram. Code 1 (la, lb, lc, ++ 1n) ・
Camera, 2. Multiplexer, 3. Image recording and reproducing means, 4. Control means, 5. Switching signal, 6. Identification signal,
7. Image signal, 8. Image selection output means, 9. Display means, lc. Recording medium. First circle

Claims (2)

[Claims] (1) A plurality of cameras, a multiplexer that multiplexes and outputs image signals from the plurality of cameras, an image recording and reproducing means that records and reproduces the output image signals of the multiplexer over time, and the image recording and reproducing means. issuing a switching signal to the multiplexer in synchronization with image recording in the
control means for causing the image recording and reproducing means to record an identification signal corresponding to the switched camera together with the image signal; and a control means for extracting the identification signal from the reproduction signal of the image recording and reproducing means to correspond to a preset identification signal. An image recording and reproducing device comprising an image selection output means for selecting only image signals and outputting the selected image signals to a display means. (2) The image recording and reproducing means uses a helical scan type video tape recorder, and a switching signal is generated for each track in synchronization with the rotation of the recording head, and one field of the image signal from the camera is generated for each track. An image recording and reproducing device characterized by recording minutes and an identification signal.