JPH02132599A - Monitor device - Google Patents

Abstract

PURPOSE:To easily and surely verify an abnormality condition after abnormality is detected by stopping the picture recording operation of a video memory and video-recording plural number of pictures in respective periods before, during, and after the occurrence of the abnormality by the video memory when the abnormality occurs. CONSTITUTION:Since a video memory 5 respectively and periodically video- records plural picture signals from a telecamera 1 in an input sequence, at the point of a certain moment, the video memory 5 records the video of a past fixed period. When the abnormality of a monitoring object is detected by a sensor 4 under this state and an abnormality detected signal from the sensor 4 is inputted to the video memory 5, the video memory 5 stops the recording operation of the video memory 5 after the fixed period passes from the inputted point. Consequently, the pictures in the respective periods before, during, and after the occurrence of the abnormality are recorded in the video memory 5. Thus, the abnormality condition in the monitoring object can be surely verified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a monitoring device that combines a television camera and a sensor to monitor abnormal conditions of a predetermined monitoring target. [Prior Art] Fig. 5 is a block diagram showing a conventional monitoring device using one television camera and a video sensor. 3 is a video sensor that detects changes in the image signal from the television camera 1; and 3 is a television monitor that displays the output image from the video sensor 2.

In such a conventional device, the television camera 1 constantly captures an image of the object to be monitored and sends the image signal to the video sensor 2. This video sensor 2 marks and displays the changed portion on the television monitor 3 when there is a change in the image information of the input image signal by more than a specified value.

Furthermore, FIG. 6 is a block diagram showing a conventional monitoring device using a plurality of television cameras (eight in this case) and video tape recorders. a television camera that captures the
21 is a sensor that detects an abnormality in the object to be monitored; 31 is a video switch that selects and outputs image signals from the television cameras 11 to 18; and 41 is a sensor selected by the video switch 31 based on the abnormality detection signal from the sensor 21. A video tape recorder (hereinafter referred to as VTR) that records image signals, 51 is this VT
This is a television monitor that displays the output image from R41.

In the conventional device shown in FIG.
send to Then, if the sensor 21 does not detect any abnormality,
The video switch 31 is in a non-selected state, and the VTR 41 is also in a stopped state.

On the other hand, when the sensor 21 detects an abnormality in the monitoring target, the image switching device 31 selects the image signal from the television camera that is imaging the abnormality part in the monitoring target based on the abnormality detection signal from the sensor 21. At the same time, the VTR 41 starts recording in response to the abnormality detection signal from the sensor 21, and the image signal of the selected television camera is recorded.

After recording, the recorded portion where the abnormality has occurred can be displayed on the television monitor 51 by starting playback of the VTR 41.

[Problems to be Solved by the Invention] However, the conventional monitoring device shown in FIG. Even if
There were issues such as the inability to verify the abnormal situation later.

Furthermore, although the conventional monitoring device shown in FIG. 6 has means for recording images (VTR 41), the sensor 21
In addition to being able to record only the situation after an abnormality is detected by
4 It takes several hundred milliseconds from the time 1 receives the abnormality detection signal from the sensor 21 and starts recording until the time it records normally.
Because it takes several seconds, it is not possible to record the situation at the time of the abnormality, and there are problems such as the inability to verify the abnormality situation by comparing it with the situation before, at the time, and after the abnormality occurred. Ta. This invention was made to solve the above-mentioned problems, and makes it possible to record before an abnormality occurs, when an abnormality occurs, and after an abnormality is detected, thereby making it possible to reliably verify the abnormal situation in the monitored object. The purpose is to obtain a monitoring device.

[Means for Solving the Problems] A monitoring device according to the present invention includes a sensor that detects an abnormality in a monitored object, and a double-page periodic recording of images from a television camera, and an abnormality detection signal from the sensor is input. The video memory is equipped with a video memory that stops the recording operation after a predetermined period of time has elapsed.

[Function] In the monitoring device according to the present invention, when the sensor detects that an abnormality has occurred in the monitored object, the abnormality detection signal is input to the video memory.

In the video memory, a plurality of images captured by a television camera are periodically recorded, and when an abnormality detection signal is input, the recording operation is stopped after a predetermined period of time has elapsed. In other words, a plurality of images are recorded in the video memory from just before an abnormality occurs in the monitoring target, during the abnormality, and even after the abnormality occurs.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, numeral 1 is a television camera that images a monitoring target (not shown) and outputs an image signal, 3 is a television monitor that displays an output image from a marker signal superimposition circuit 7, which will be described later, and 4 is a television camera that captures an image of a monitoring target (not shown). A sensor that detects an abnormality; 5 a video memory that periodically records a plurality of images from the television camera 1; and 6 a video memory that stops the recording operation after a predetermined period of time has passed after the abnormality detection signal from the sensor 4 is input; This is an image identification circuit that compares the reproduced image from 5 with a predetermined reference image to determine whether there is a difference greater than a specified value. Use the previous image. Further, 7 is a marker signal superimposition circuit that superimposes a marker signal on an abnormal portion of the reproduced image of the video memory 5 based on the identification signal from the image identification circuit 6 and displays the same on the television monitor 3.

Next, the operation of the apparatus of this embodiment will be explained with reference to FIGS. 2(a) to 2(d). The video memory 5 repeatedly and periodically records a plurality of image signals (for example, 16 images in this embodiment) from the television camera 1 in the order of input, so at a certain moment, it records images from a certain period of time in the past. There will be.

In this state, when the sensor 4 detects an abnormality in the monitored object, the abnormality detection signal from the sensor 4 is input to the video memory 5. When the video memory 5 receives the abnormality detection signal, the recording operation of the video memory 5 is stopped after a predetermined period of time has elapsed from the time of input of the abnormality detection signal. As a result, Figure 2 (a
) to (d), images before, during, and after the occurrence of the abnormality are recorded in the video memory 5.

In this embodiment, the number of recorded images in the video memory 5 is 16, and the number in the recorded content indicates the memory number of the video memory 5, with the smaller number being the past image.

Here, images before the abnormality are recorded in areas with memory numbers 1 to 5, images during the abnormality are recorded in areas 6 to 12, and images after the abnormality are recorded in areas with memory numbers 13 to 16.

Next, the image identification circuit 6 uses the image with memory number 1, which is the image before the abnormality, as a reference image among the 16 images recorded in the video memory, and compares this reference image with the recorded images from memory number 2 onwards. A comparison of the luminance signal or color signal is performed, and the presence or absence of an image change with a difference greater than a specified value is identified. Then, the image identification circuit 6 stops the comparison operation when there is an image change with a difference greater than a specified value, and outputs an identification signal indicating that there is an abnormality to the marker signal superimposition circuit 7.

In this state, an image with an abnormality is output as a reproduced image signal from the video memory 5 to the marker signal superimposition circuit 7, so the marker signal superposition circuit 7 sends a marker signal to display the abnormal part. are superimposed and displayed on the television monitor 3.

In this way, according to the device of this embodiment, the video memory 5
Since multiple images are recorded from before to after the abnormality,
It becomes possible to easily and reliably verify an abnormal situation after an abnormality is detected.

In addition, with conventional devices, there was a risk of false alarms occurring due to sudden changes in sunlight, wind, movement of the subject (monitored subject) due to traffic lights, etc. when the monitored subject was outdoors. According to the example device, the sensor 4 activates the abnormality processing operation of the video memory 5, performs marking processing on the portion corresponding to the recorded abnormality portion, and displays the image on the television monitor 3.
Since the markings are displayed on the display, there is also the advantage that reliable alarm processing can be performed without causing false alarms like in the past.

In the above embodiment, a method is described in which input images from the television camera 1 are continuously recorded in the video memory 5, but it is also possible to record one input image every N, and in this case, , the recording time can be increased accordingly.

Next, other embodiments of the present invention will be described with reference to FIGS. 3 and 4. In this embodiment, a case is shown in which a plurality of (eight in this case) television cameras 11 to 18 are provided.

In FIG. 3, 11 to 18 are television cameras that image each part of a monitoring target (not shown) and output an image signal, 21 is a sensor that detects an abnormality in the monitoring target, and 31 is a four-part display that will be described later. A video switching device that cyclically switches multiple inputs of 4-split image signals from the device at regular intervals; 41 is a VTR for recording image signals; 51 is a VTR4;
TV monitor displaying the output image from 1, 61.62
71 is a 4-split display device that combines images from the television cameras 11 to 14 and 15 to 18 into the same 4-split screen; This is a video memory that stops recording operation after a predetermined period of time has elapsed since the abnormality detection signal was input.

The operation of the apparatus of this embodiment configured as described above will be explained with reference to FIGS. 4(a) to 4(e). Of the eight TV cameras 11 to 18 in the entire system, TV cameras 11 to 1
4 and 15 to 18 are respectively 4-split display devices 61.6
2, the images are synthesized on the same screen divided into four parts [4th
See figure (e)]. These two 4-split display devices 61.62
The four-split image signals A and B are periodically switched at fixed time intervals by a video switching device 31 and input into the video memory 71 alternately. Since this video memory 71 repeatedly and periodically records a plurality of image signals A and B in the input order [see FIG. 4(d)], at a certain moment, the television camera 1 This means that the image signals from 18 to 18 are recorded in time series.

In this state, when the sensor 21 detects an abnormality in the monitoring target as shown in FIGS. 4(a) to 4(c), the abnormality detection signal from the sensor 21 is input to the video memory 71 and the VTR 41. Ru. Although the VTR 41 is activated to record by the abnormality detection signal, it takes several hundred milliseconds to several seconds (approximately constant depending on the model) until the video is recorded normally.

Therefore, the periodic recording of the video memory 71 is continued from the time the abnormality is detected until the time when the VTR 41 normally records.
Recording in the video memory 71 is stopped when the TR 41 is normally recorded.

As a result, as shown in FIG. 2(d), image signals from before an abnormality in the monitored object is detected to when the VTR 41 normally records the screen after the abnormality are stored in the video memory 71.
will be recorded.

In this way, even before the sensor 21 detects an abnormality in the monitored object, even with the device of the embodiment shown in FIG. 3.4,
The image signals of the television cameras 11 to 18 during the time when the abnormality occurs and even after the abnormality occurs until the VTR 4 1 normally records are recorded as a video memo! J71, and subsequently the VTR41 records subsequent image signals, so the abnormality situation in the monitored object can be seen before the abnormality occurs, as well as when the abnormality occurs. It is possible to easily and reliably verify the abnormality occurrence situation by comparing the time and after the abnormality has occurred.

In the above embodiment, eight television cameras are provided,
Although a case has been described in which two 4-split display devices are provided in order to synthesize a 4-split image, the present invention is not limited to this, and the present invention is not limited to this. Even if the display device is selected, the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the present invention, when an abnormality occurs, an abnormality detection signal is output from the sensor to the video memory to stop the recording operation of the video memory, and the video memory is recorded before, during, and after the abnormality occurs. Since the configuration is configured to record a plurality of images, it is possible to easily and reliably verify the abnormal situation after the abnormality is detected.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a monitoring device according to an embodiment of the present invention, FIGS. 2(a) to (d) are timing charts for explaining the operation of the device of the above embodiment, and FIG. 3 is a block diagram showing a monitoring device according to an embodiment of the present invention. 4(a) to 4(e) are timing charts for explaining the operation of the device of the other embodiment, and FIGS. 5 and 6 respectively show a conventional monitoring device. FIG. 2 is a block diagram showing a monitoring device. In the figure, 1.--television camera, 3-.-television monitor, 4.--sensor, 5--video memory, 11-18--television camera, 21.--sensor, 51.--television monitor,
7 1 ・−・−Video memory. In addition, the same reference numerals in the figures indicate the same or equivalent parts. To Figure 3 11, old 111 TV camera 71-1-pitometries

Claims (1)

[Claims] A monitoring device that constantly images a monitored target with a television camera, monitors abnormalities in the monitored target based on image signals from the television camera, and displays abnormalities, the monitoring device comprising: a sensor that detects abnormalities in the monitored target; and the television camera. 1. A monitoring device comprising: a video memory that periodically records a plurality of images from the sensor and stops the recording operation after a predetermined period of time has elapsed after an abnormality detection signal from the sensor is input.