JPH0296898A - video signal recording device - Google Patents

Abstract

PURPOSE:To improve economical efficiency and reliability by distributing a video signal to an ordinary monitoring state in which continuous pictures are outputted for monitoring and a state in which a monitored video signal at the time of the input of an alarm signal is stored as a still picture in a memory by switching a selector in response to the input of the alarm signal. CONSTITUTION:The video signal obtained by a video camera 1 is led usually to a monitor television 4 through the contact 6a of one side of the selector 6, and the monitoring of a usual continuous video picture is performed. In the case where the alarm signal arrives at an alarm signal terminal 3, the contact of the selector 6 is brought into contact with the contact 6b of the other side by a switching control device 9 according to said signal. Accordingly, the video signal from the video camera 1 is stored as a still picture video signal in the memory 5 through an A/D converter. The output of this memory 5 is led to the monitor television 4 through a D/A converter, and a video picture is outputted to the monitor television 4. Thus, the economical efficiency and the reliability are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video signal recording device, and more particularly to a video signal recording device, and in particular to a method for reducing search time and improving reliability of recorded images when an alarm occurs in a monitoring system.

[Prior Art] Generally, video surveillance systems are used in bank counters, automatic teller machines, night safes, and the like.

FIG. 2 shows a block diagram of a conventional monitoring system. In the figure, a video signal output from a surveillance video camera (1) is output from a sensor video tape recorder (2).
) and this sensor videotape recorder (2)
From there, the video signal is directed to a monitor television (4). The sensor video tape recorder (2) records an image when a signal is received from the alarm signal terminal (3).

In such a conventional video signal recording device, a video signal from a video camera (1) is input to a sensor video tape recorder (2), but normally the video tape recorder does not operate and is not recorded, and the video signal is input to a sensor video tape recorder (2). (4) and used for normal monitoring work.

At this time, instead of the sensor video tape recorder (2),
When a /L video tape recorder is used, intermittent recording is performed during normal times when there is no alarm signal.

When an alarm signal arrives at the alarm signal terminal (3) from a sensor (not shown), the sensor video tape recorder (2
) starts operation in response to this alarm signal and continuously records video signals from the video camera (1) for a predetermined period of time. Continuous image recording is also performed when a T/L video tape recorder is used.

[Invention or problem to be solved]

Conventional video signal recording devices had the above configuration, so the sensor video tape recorder (or T/L video tape recorder) used as the video signal recording device was expensive and required a magnetic head for magnetic recording and playback. In addition to being unreliable due to clogging, alarm conditions rarely occur, and searching for the recorded portion of the video tape recorder is very time consuming and inconvenient. there were.

The present invention was made with the aim of solving these problems, and can solve the disadvantages of economical efficiency and reliability of magnetic recording and reproducing devices in surveillance systems, as well as solve the trouble of searching for recorded image information. The purpose is to obtain a device that can eliminate the

Means for Solving Problem C3] The video signal recording device according to the present invention includes a monitor television that outputs a video signal from a video camera as an image, a monitor that stores the video signal as a still image, and a video signal recording device that normally outputs the video signal as a still image. to a monitor TV to output continuous images,
It has a switching device that guides the video signal to the monitor television as a still image via the memory when an alarm signal is generated.

[Operation] The video signal recording device according to the present invention stores surveillance video information as a still image in a memory upon input of an alarm signal.

Because the images are stored in memory, they are more reliable than magnetic recording devices.

Image retrieval upon input of an alarm signal is much shorter than with a magnetic recording device.

[Example] Next, the present invention will be described in more detail based on the example shown in FIG.

In the figure, a video signal obtained by a video camera (1) is normally guided to a monitor television (4) through one contact (6a) of a switch (6). Normal continuous video monitoring is carried out by

When an alarm signal arrives at the alarm signal terminal (3), the solenoid (9) is excited by the signal, and the contact of the switch (6) contacts the other contact (6b). Thereby, the video signal from the video camera (1) is stored in the memory (5) as a still image video signal via the A/D converter. The output of this memory (5) is led to a monitor television (4) via a D/A converter, and an image is output to the monitor television (4).

To return to normal monitoring, apply a reset signal to the solenoid (9) to demagnetize it, and the contact of the switch (6) returns from the other contact (6b) to one contact (6a), and the video camera ( 1) The video signal from
4).

A reset signal for returning to the normal monitoring state can also be input from the alarm signal terminal (3).

According to the video signal recording device of the present invention that behaves as described above, video recording is performed by the memory (5), and all the various inconveniences associated with recording magnetic tape are eliminated, resulting in extremely high reliability. Not only is this useful, but the video at the time of the alarm can be retrieved and viewed later in an extremely short time.

Furthermore, when recording on a video tape recorder, it takes time from when the alarm signal is output until the recording head loads the tape. However, in the present invention, since it is possible to immediately record in the memory (5), there is also the advantage that the image immediately after the alarm signal is output can be recorded.

In the above embodiment, a single memory (5) is used, but it may be more convenient to provide a plurality of memories and store video information corresponding to each of a plurality of alarm signals. Become.

[Effects of the Invention] As explained above, the present invention switches the switch in response to the input of an alarm signal and outputs continuous images on the monitor in the normal monitoring state, and when the alarm signal is input, the monitoring video is output as a still image. Compared to the case of using a magnetic recording/reproducing device, it has a structure that divides the state into the state stored in memory and the state stored in memory.
This has the effect of being significantly advantageous in terms of economy, reliability, and search time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a video signal recording device according to the present invention, and FIG. 2 is a block diagram of a conventional video recording device. In the figure, (1) is a video camera, (2) is a sensor video tape recorder, (3) is an alarm signal terminal, and (4) is a video tape recorder.
) is a monitor television, (5) is a memory, and (6) is a switch. Note that the same reference numerals in the figures indicate the same or equivalent parts. Procedural amendment (voluntary) Year, month, date Detailed description of the invention of the specification subject to amendment and drawings.

Claims (1)

[Claims] A monitor television that inputs the video signal of the video camera for monitoring, a memory that stores the video signal of the video camera as a still image, and a video camera that stores the video signal of the video camera as a still image. A video signal recording device, which is connected to a television monitor, and includes a switching device which, in response to input of an alarm signal, leads the video signal of the video camera to the television monitor as a still image via the memory.