JPH064731A - Operating state monitor device - Google Patents

Abstract

PURPOSE:To record states before and after the change of the operating state with a low cost. CONSTITUTION:An operating state monitor device records picture data of an equipment picked up by a video camera on a VTR 4 to monitor the operating state of the monitor object. This device is provided with a compressing circuit 11, a FIFO memory circuit 12, an expanding circuit 13, and a control circuit 5. The compressing circuit 11 compresses picture data obtained by the video camera. The FIFO memory circuit 12 delays picture data compressed by the compressing circuit 11. The expanding circuit 12 expands the delay result of the FIFO memory circuit 12. The control circuit 5 records the expansion result of the expanding circuit 13 on the VTR 4 when the operating state is changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating condition monitoring device, and more particularly to an operating condition monitoring device for recording image data of a monitoring target imaged by an image pickup device in a recording device to monitor the operating condition of the monitoring target. Regarding the device.

[0002]

2. Description of the Related Art A monitor camera is installed in a production facility to monitor the operating state of the production facility (an example of a monitoring target) in a factory, and the operating state of the production facility is imaged by the monitor camera. 2. Description of the Related Art There is known an operating state monitoring device that displays a captured image and records the image on a video tape recorder (hereinafter referred to as VTR). In this device, the operation state can be recorded on the VTR by using a signal indicating a malfunction of the equipment as a trigger. In this case, only the operating state after the occurrence of the defect is recorded in the VTR, so that the operating state before the occurrence of the defect necessary for investigating the cause of the defect cannot be known. In addition, when recording the operating state before the occurrence of a failure on the VTR, the continuous operating state is set to VT.
It is recorded in R, the VTR tape recorded later is edited, and the operating state before and after the occurrence of the trouble is displayed. In this case, there is a problem that the editing work requires much labor and time.

In order to solve these problems, it is possible to use an operating condition monitoring device for temporarily recording an image in a memory. With this device, images can be converted into a digital format and images of up to 4800 frames can be saved in the memory at 50 to 1000 frames per second. This device uses the output of various sensors such as optical sensors and proximity sensors as a trigger to continuously record until a trigger is received, and after recording the trigger, continues recording until the memory capacity becomes full. It has a record trigger mode. As a result, the state before and after the trigger input can be known.

However, in this configuration, since the captured image is stored in the memory as it is, the capacity of the memory for recording the image of a maximum of 4800 frames becomes enormous and the cost of the apparatus increases. This type of device usually
Since it is provided as an accessory to the production facility, the price of this device is reflected in the production cost, which increases the production cost.

An object of the present invention is to be able to record the state before and after the change of the operating state at low cost.

[0006]

An operating state monitoring apparatus according to the present invention is an apparatus for recording the image data of a monitoring target imaged by an image capturing unit in a recording unit to monitor the operating state of the monitoring target. is there. This device comprises a compression means, a delay means, an expansion means, and a recording control means. The compression means is means for compressing the image data obtained by the imaging means. The delay means delays the image data compressed by the compression means. The expansion means expands the delay result of the delay means. The recording control means causes the recording means to record the expansion result of the expansion means when the operating state changes.

[0007]

In the operating state monitoring apparatus according to the present invention, when the monitoring target is imaged by the image pickup means, the image data obtained by the image pickup means is compressed by the compression means. The compressed image data is delayed by the delay means. The delay result is expanded by the expansion means and restored to the original image data. When the operating state changes, the recording control means records the expansion result of the expansion means in the recording means.

Here, since the image data can be delayed by the delay means, if the expansion result is recorded in the recording means when the operating state changes, the states before and after the change of the operating state can be recorded in the recording means. Further, since the image data compressed by the compression means is delayed by the delay means, the amount of data handled by the delay means is reduced, and for example, when a memory is used as the delay means, the capacity of the memory can be reduced. As a result, the cost of the device can be reduced. Therefore, it is possible to record the state before and after the change of the operating state at low cost.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a video operation monitoring system adopting an embodiment of the present invention. In the figure, a video operation monitoring system includes four video cameras 5 for capturing the equipment A to be monitored from four different directions, and a multi-camera for synthesizing image data obtained by the four video cameras 5. The channel adapter 2, the operating condition monitoring device 1 for compressing, delaying and expanding the video signal VDS obtained by the multi-channel adapter 2, the monitor 3 comprising a CRT display for display, and the operating condition monitoring device 1 for delaying The delayed video signal VDD that has been generated to the external trigger signal TR
It is mainly composed of a video tape recorder (VTR) 4 for recording for a predetermined time at G input timing.

The multi-channel adapter 2 digitizes an image obtained by the video camera 5, synthesizes the digitized image so that it can be displayed on the screen of the monitor 3 in four divisions, and synthesizes the synthesized image into an analog video signal VDS. Convert. As shown in FIG. 2, the operating status monitoring apparatus 1 converts the analog video signal VDS into a digital value A /
The D conversion circuit 10, the compression circuit 11 for compressing a digital video signal by a compression encoding method, the compressed video signal is stored for about 30 seconds (900 frames) at maximum, and the video signal is delayed for 30 seconds at maximum. A FIFO memory circuit 12 for expanding the compressed video signal, an expansion circuit 13 for expanding the compressed and stored video signal, and a video signal circuit 14 for converting the expanded video signal into an analog delayed video signal VDD.

The operating state monitoring device 1 is also provided with an external input terminal 6 for inputting an external trigger signal TRG, and the input external trigger signal TRG is supplied to the control circuit 1.
Given to 5. The control circuit 15 uses the external trigger signal T
When RG is input, it outputs the video control signal VCT which is turned on for a predetermined period to the VTR 4. Further, the control circuit 15 is a FIF
The delay amount setting signal is output to the O memory circuit 12. FIF
The O memory circuit 12 stores the image data for the set delay amount.

The analog delayed video signal VDD output from the video signal circuit 14 is given to the VTR 4, and when the video control signal VCT is turned on, the delayed video signal VDD is recorded by the VTR 4. The control circuit 15
The ON period of the video control signal VCT output from is, for example, about 5 minutes. Further, the ON period of the video control signal VCT may be set externally.

Next, the operation of the above embodiment will be described with reference to the timing chart shown in FIG. Note that, here, in order to simplify the description, the FIFO memory circuit 1
The case where image data for 4 frames is stored in 2 will be described as an example. The numbers shown in FIG. 3 are frames. The video signal VDS provided from the multi-channel adapter 2 is A / D converted by the A / D conversion circuit 10,
Further, it is compressed by the compression circuit 11. The compressed video signal is stored in the FIFO memory circuit 12 for four frames and sequentially expanded by the expansion circuit 13 and the video signal circuit 14
Is converted into a video signal and output as a delayed video signal VDD. Here, the delayed video signal VDD is the video signal VDS
It is output with a delay of 4 frames as compared with.

In this state, if an abnormal state occurs at the timing of the eighth frame of the video signal VDS and the external trigger signal TRG is input from the external input terminal 6, the video control signal VCT can be recorded for, for example, 9 frames. Turn on. Then, from the 4th frame to the 1st
Nine frames up to two are recorded in the VTR4.
The recording data REC is data from the fourth frame before the timing (the eighth frame) when the external trigger signal TRG is input to the twelfth frame after the input. By reproducing this data REC, it is possible to check the operating condition of the equipment when the external trigger signal TRG changes, that is, before and after the occurrence of the abnormal condition, and to investigate the cause of the abnormal condition.

Further, in this embodiment, since the images obtained by picking up the equipment from four directions are synthesized and displayed, it is possible to know the change in the operating state which cannot be seen from one image, and the cause can be more surely investigated. can do. As a compression method, a general compression method such as JPEG or MPEG is adopted.

[Other Embodiments] (a) In the above embodiment, the multi-channel adapter 2 is used.
Although the image synthesized by is input to the operating state monitoring device 1, the multi-channel adapter 2 is not always necessary. (B) Instead of the FIFO memory circuit of the above embodiment, various storage / recording media such as a semiconductor memory, a hard disk and a VTR can be used as the delay means.

[0017]

In the operating condition monitoring apparatus according to the present invention, since the image is compressed and delayed, the data for delaying can be reduced, and the state before and after the change of the operating condition can be recorded at low cost.

[Brief description of drawings]

FIG. 1 is a block diagram of a video operation monitoring system adopting an embodiment of the present invention.

FIG. 2 is a block diagram of an operating state monitoring device.

FIG. 3 is a timing chart showing the operation of the operating state monitoring device.

[Explanation of symbols]

 1 Operating State Monitoring Device 4 VTR 5 Video Camera 6 External Input Terminal 11 Compression Circuit 12 FIFO Memory Circuit 13 Expansion Circuit 15 Control Circuit

Claims (1)

[Claims] 1. An operating condition monitoring device for recording image data of a monitoring target imaged by an image capturing device in a recording device to monitor an operating condition of the monitoring target, the operating condition monitoring device being obtained by the image capturing device. Compression means for compressing image data, delay means for delaying the image data compressed by the compression means, decompression means for decompressing the delay result of the delay means, and decompression means of the decompression means when the operating state changes. An operating condition monitoring device comprising: a recording control unit that records the expansion result in the recording unit.