JP3392331B2 - Video storage system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video storage system, and in particular, it constantly monitors the operation of a control device such as a rolling machine used in a steel plant system and records a digital video signal of its operating state. The present invention relates to a video storage system applicable when storing.

[0002]

2. Description of the Related Art Generally, in a large-scale system such as a steel plant system, a videotape of a video signal obtained by photographing the operating states of these control devices is prepared in case that the operation of each control device becomes abnormal in the field. Recorder (VT
R) Records are accumulated in equipment, etc., and especially in steel plant systems, in order to investigate the cause of the accident,
The video signal that captures the operating state of the control device is recorded. In this case, when the VTR device is used to record and store the video signal for a long time, the video tape is replaced every several hours.

Further, as disclosed in Japanese Patent Laid-Open No. 7-101338, at a railroad crossing, the VTR device is operated only when it is detected that a moving body such as an automobile has entered the railroad crossing. A railroad crossing photographing device is known that performs shooting mainly on the railroad crossing blocking rod, analyzes the situation when the railroad crossing blocking rod is damaged by a moving body, and identifies the moving body with the railroad crossing blocking rod damaged. There is. This railroad crossing photographing device controls recording start and recording stop of the VTR device by using first and second sensor information for detecting entry and exit of a moving body into and from the railroad crossing. Operation control is performed on the VTR device such that the VTR device starts recording by supplying the information and the recording of the VTR device is stopped by supplying the second sensor information.

[0004]

In the above-mentioned steel plant system, the operating states of various control devices are always set to V
If you try to shoot with a TR device, you will need a large amount of video tape to be used with the VTR device, and when replacing the video tape of the VTR device, you will inevitably need manual labor. There is a problem that it takes a lot of time and effort to replace the.

Further, in the steel plant system, the operating states of various control equipment are described in the above-mentioned Japanese Patent Laid-Open No. 7-10.
When the VTR device is used to capture an image only when necessary like the device disclosed in Japanese Patent No. 1338,
Compared to the case described above, a large amount of video tape is not required, and the time and effort for exchanging video tapes are reduced. However, if shooting was performed using the VTR device only when necessary, it was possible There is a problem that important scenes in the operating state may not be recorded on the VTR device, which is not useful for investigating the cause of the accident.

The present invention solves these problems, and an object thereof is to eliminate the need for a large amount of recording media and frequent replacement of recording media, and to always provide a video signal of the operating state of a control device. An object is to provide a video storage system capable of recording.

[0007]

In order to achieve the above object, the image storage system of the present invention is rolled by a rolling mill.
Whether the steel plate is a high-grade steel plate, a low-grade steel plate, or a general steel plate
Operation information acquisition unit that acquires information on Ruka and operation information acquisition
Rolled from the information acquired by the department
It is common to judge whether it is a grade steel plate or a general steel plate.
In addition, if the rolled plate is judged to be a high-grade steel plate, a digital image is displayed.
Set the number of colors of the image signal to n1 and judge that the rolled plate is a low grade steel plate
If the number of colors of the digital video signal is n2 (n2 <
n1), and when the rolled plate is judged to be a general steel plate
Is the number of colors of the digital video signal n3 (n2 <n3 <n
Video signal resolution setting section set to 1) and digital video
Set the signal to the resolution set by the video signal resolution setting section.
Video signal resolution conversion processing unit for conversion processing and video signal resolution
The digital video signal converted by the image conversion processing unit
And a database for recording . Also, the purpose
To achieve, video storage system of the present invention, rolling
Information acquisition unit that acquires the peripheral speed of the work roll of the machine
And the information acquired by the sensor information acquisition unit
When the rolled material is bitten into the work roll
It is judged whether it is caught or not and
When the digital video signal is compressed when it is turned off
Is set to the first compression ratio and must be bitten
If the digital video signal is compressed if it is judged
The second compression rate (second compression rate <first compression rate).
Video signal resolution setting section and the digital video signal
Conversion processing to the resolution set by the image signal resolution setting unit
Video signal resolution conversion processing unit and video signal resolution conversion
The digital video signal converted by the processing unit is recorded.
And a database .

According to the above means, when the digital video signal obtained by photographing the operating state of the control device is accepted, the digital video signal stored in the recording medium is made to correspond to the contents of various control information inputted. Since the resolution is set to a good state (normal state) and stored in the recording medium, or the resolution is made lower than the normal state and stored in the recording medium, the digital video signal is stored in the normal state. Compared to the case of sequentially accumulating on the recording medium with the resolution of
The amount of recorded digital video signals can be greatly reduced, a large amount of recording medium is not required, the labor required for exchanging the recording medium is reduced, and important scenes in the operating state of various control devices are It is possible to avoid a situation where the data is not recorded on the recording medium.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In an embodiment of the present invention, a video storage system sequentially receives video signals, which are obtained by photographing the operating state of a control device whose operation is controlled by various control information, as digital video signals. Storing the received digital video signal in a recording medium,
A plurality of control information acquisition units that individually capture various control information, and a video signal resolution setting unit that sets the resolution of the digital video signal to be stored in the recording medium according to the contents of the various control information captured by the plurality of control information acquisition units It is equipped with and.

In one embodiment of the present invention, the video signal resolution setting unit sets at least one of the temporal resolution, the spatial resolution and the amplitude resolution for the digital video signal.

In another embodiment of the present invention, the video signal resolution setting unit sets at least one of the frame rate and the number of interlaces for the digital video signal.

In still another embodiment of still another embodiment of the present invention, the video signal resolution setting unit sets the number of pixels per unit area for the digital video signal.

In still another embodiment of the present invention,
The video signal resolution setting unit, for digital video signals,
The number of colors is set.

In still another embodiment of the present invention,
The video signal resolution setting unit, for digital video signals,
The compression rate of the image compression algorithm is set.

In still another embodiment of still another embodiment of the present invention, the received digital video signal is temporarily stored in the video temporary storage unit.

In still another embodiment of the present invention,
One of the various types of control information captured by the control information acquisition unit is sensor information for sensing the operating state of the control device.

In still another embodiment of the present invention,
One of the various types of control information fetched by the control information acquisition unit is alarm information for detecting an abnormality in the operating state of the control device.

In still another embodiment of the present invention,
One of the various types of control information fetched by the control information acquisition unit is operation event information that causes the operating state of the control device to operate in accordance with terminal operation.

In still another embodiment of the present invention,
One of the various types of control information fetched by the control information acquisition unit is operation information that makes the operation state of the control device operate according to the operation schedule.

In this case, the operation event information is accepted by the operation information acquisition unit, which is one of the plurality of control information acquisition units.

In still another embodiment of the present invention,
One of the various types of control information fetched by the control information acquisition unit is maintenance information that makes the operating state of the control device operate according to the inspection record.

In this case, the maintenance information is received by the maintenance information acquisition unit, which is one of the plurality of control information acquisition units.

In still another embodiment of the present invention,
The video signal resolution setting unit sets the resolution of a predetermined area in the digital video signal to be different from the resolution of other areas.

In still another embodiment of the present invention, the control device is a rolling machine used in a steel plant, and a digital video signal during operation of the control device is supplied to the rolling machine. This is a photograph of the wavy state of the material.

According to these embodiments of the present invention, when the digital video signals obtained by photographing the operating state of the control device are sequentially received, the digital signals stored in the recording medium corresponding to various control information to be input are stored. The recording capacity of the digital video signal can be reduced compared to the case where the resolution of the video signal is changed to a good state (normal state) or a lowered state and the digital video signal is stored in the recording medium at the normal resolution. Specifically, the video signal resolution setting unit is a one in which the received digital video signal captures an important scene based on various control information individually captured by the plurality of control information acquisition units. If it is determined that it is a digital video signal of an important scene, it is determined whether or not it is a scene that is not important, that is, a scene that is not so important. Only, the resolution of the digital video signal stored in the recording medium is kept in a good state (normal state) so that the details of the operation mode can be understood. On the other hand, it is a digital video signal obtained by photographing other scenes. If it is determined that the resolution of the digital video signal to be stored in the recording medium is set lower than that in the normal state, the operation mode is roughly understood. Recording at a lower resolution than that in the state significantly reduces the amount of digital video signals stored in the recording medium as compared to the case where the resolution of the digital video signals is recorded in the normal state. When recording sequentially, not only does a large amount of recording medium become unnecessary, but the time and effort required for exchanging the recording medium are also greatly reduced. Occurrence of a situation that fail to record important scenes in the state on the recording medium is avoided.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a video storage system according to the present invention, which is an example applied when the video storage system monitors the operation of a rolling mill in a steel plant system. Is shown.

In FIG. 1, 1 is a control unit, 2 is a video signal acquisition unit, 3 is a video signal temporary storage unit, 4 is an abnormality diagnosis unit, and 5 is an abnormality diagnosis unit.
Is an operation information acquisition unit, 6 is a sensor information acquisition unit, 7 is a database (DB, recording medium), 8 is a video signal resolution conversion processing unit, 9 is a video signal resolution setting unit, 10 is an operation event acquisition unit, and 11 is maintenance. An information acquisition unit, 12 is an alarm information acquisition unit, 13 is a television (TV) camera, and 14 is a bus line.

The video signal acquisition unit 2 is the TV camera 1
3 is connected to the control unit 1 via the bus line 14, and the video signal acquisition unit 2, the video signal temporary storage unit 3, the abnormality diagnosis unit 4, the operation information acquisition unit 5, the sensor information acquisition unit 6, the database 7, and the image. Signal resolution conversion processing unit 8, video signal resolution setting unit 9, operation event acquisition unit 10, maintenance information acquisition unit 1
1 and the alarm information acquisition unit 12, respectively. The operation information acquisition unit 5 is supplied with plant operation information representing the rolling schedule of the rolling mill used in the steel plant system, and the sensor information acquisition unit 6 is supplied with plant control information representing the sensor information of this rolling mill. The operation event acquisition unit 10 is supplied with operation event information obtained when the operator operates this rolling mill, and the maintenance information acquisition unit 11 supplies plant maintenance information indicating the date and time of parts replacement of this rolling mill and inspection checks. Is supplied. The alarm information acquisition unit 12 is supplied with alarm information indicating an alarm due to an abnormal operation of the rolling mill.

In this case, the TV camera 13 photographs a portion of the rolling mill in which the main operation is performed, for example, a portion where the rolling plate is input to the rolling mill, and the obtained video signal is obtained by the video signal acquisition unit 2 And the video signal acquisition unit 2 converts the acquired video signal into a digital video signal. The video signal temporary storage unit 3 temporarily stores the digital video signal obtained by the video signal acquisition unit 2, and the abnormality diagnosis unit 4 is based on the plant control information representing the sensor information acquired by the sensor information acquisition unit 6. To perform abnormality diagnosis of rolling mill operation. The operation information acquisition unit 5 acquires the plant operation information and stores the information content, and the sensor information acquisition unit 6 acquires the plant control information and stores the information content. The database 7 sequentially records digital video signals obtained by photographing the main operating states of the rolling mill. The video signal resolution setting unit 9 sets the resolution such as the frame rate of the digital video signal stored in the database 7, the number of colors, the compression ratio at the time of MPEG compression, and the size of the video, and the video signal resolution conversion processing unit. 8 is
The resolution is converted to the resolution set by the video signal resolution setting unit 9.
The operation event acquisition unit 10 acquires operation event information and stores the information content, the maintenance information acquisition unit 11 acquires plant maintenance information and stores the information content, and the alarm information acquisition unit 12 alarms. Acquire information and store the information content. Further, the control unit 1 comprehensively controls the overall operation of the video storage system via the bus line 14, and issues a video signal acquisition command to the video signal acquisition unit 2 or the operation information acquisition unit 5 A plant operation information acquisition command, a sensor information acquisition unit 6 a plant control information acquisition command representing sensor information, a video signal resolution setting unit 9 a video signal resolution setting command, and a video signal resolution conversion unit. 8 issues a video signal resolution conversion command, and issues a maintenance information acquisition command to the maintenance information acquisition unit 11.

Next, FIG. 2, FIG. 3, FIG. 4, and FIG. 5 are flow charts showing the operation process of the video storage system of this embodiment.

The operation of the video storage system of this embodiment will be described below with reference to the flow charts shown in FIGS. 2 to 5.

First, in step S1, the control unit 1
Makes initial settings for the video storage system. At this time, the emergency flag indicating the generation of alarm information is set to 0.

Next, in step S2, the video signal acquisition unit 2 sequentially acquires the video signals representing the operating state of the rolling mill taken by the TV camera 100 in real time,
Convert to digital video signal. In this case, the video signal acquired by the video signal acquisition unit 2 has the best resolution, and the frame rate of the video signal at this time is 30 frames / sec and the MPEG compression rate of the video signal is 1/5.
0, the number of colors of the video signal is 16.7 million colors, and the size of the video of the video signal is 640 × 480 pixels.

Next, in step S3, the video signal temporary storage unit 3 transfers the digital video signals sequentially acquired by the video signal acquisition unit 2, and temporarily records and stores them.

Then, in step S4, the control unit 1
Determines whether 10 minutes have elapsed since the acquisition of the video signal in the video signal acquisition unit 2 was started. Then, when it is determined that 10 minutes have passed since the start of the acquisition of the video signal (Y), the process proceeds to the next step S5, while 10 minutes have elapsed since the start of the acquisition of the video signal. If it is determined that there is no (N), the process proceeds to the previous step S2,
The operations after step S2 are executed again.

Through the steps S2 to S4, when the alarm information is supplied, the video signal from the time when the alarm information is generated up to 10 minutes before the generation of the digital video signal can be obtained without lowering the resolution. Can be recorded and stored.

Then, in step S5, the alarm information acquisition unit 12 acquires alarm information related to the operating state of the rolling mill, such as an oil pressure abnormality signal, a roll pressure abnormality signal, and a rolling plate temperature abnormality signal.

Next, in step S6, the sensor information acquisition unit 6 acquires sensor information related to the rolling mill, such as motor current, motor voltage, motor rotation speed, motor output, motor horsepower, and work roll peripheral speed.

Next, in step S7, the maintenance information acquisition unit 11 acquires the plant maintenance information indicating the parts replacement date / time information in the inspection record of the rolling mill.

Then, in step S8, the operation information acquisition section 5 acquires the steel plate type information of the rolled material in the operation schedule.

Subsequently, in step S9, the operation event acquisition section 10 acquires operation event information obtained when the operator manually operates the rolling mill.

Next, in step S10, the abnormality diagnosing unit 9 determines the rolling mill based on the rolling mill motor current, motor voltage, motor speed, motor output, motor horsepower, etc. acquired by the sensor information acquisition unit 6. The operating state is diagnosed, and as a result of the diagnosis, an abnormal signal or a normal signal is output. In this case, the abnormality diagnosing unit 9 includes a neural network that learns information patterns in the normal operation state and the abnormal operation state of the rolling mill, and by including such a neural network, the structure is similar to that of a rolling mill. Even for a control device that is complicated and whose behavior is difficult to analyze, it is easy to determine the abnormal operation.

Next, in step S11, the video signal resolution setting unit 9 sets the initial value information stored in advance in the control unit 1, that is, the initial value of the resolution of the digital video signal to be set and the digital video signal to be recorded. Among them, the initial value information representing the digital video signal area that needs to be monitored in detail is read from the control unit 1. in this case,
When reading the initial value information accumulated in the control unit 1,
The video signal resolution setting unit 9 sets the initial value of the frame rate when storing the digital video signal, the initial value of the MPEG compression rate, the initial value of the number of colors, and the initial value of the size of the video signal. Specifically, the initial value of the frame rate when accumulating digital video signals is 10 frames / second, MP
The initial value of the EG compression rate is 1/50, and the initial value of the number of colors is 65.
The initial values of the thousand colors and the size of the video signal are 320 × 240 pixels. Furthermore, the size of the video signal is 320 × 2
The size of the position of the area indicating the backup roll and the size of the position of the area indicating the valve in the video signal captured by 40 pixels are designated. Here, the upper left coordinate position of the area of the backup roll is (120, 50),
The size is 100 horizontal x 100 vertical, the upper left coordinates of the valve area are (10, 120), and the size is 30 horizontal.
× 50 pixels vertically.

In the next step S12, the video signal resolution setting unit 9 determines whether the normal signal or the abnormal signal has been output, as a result of the operation state diagnosis of the rolling mill in the abnormality diagnosing unit 4. When it is determined that the normal signal is output (Y), the process proceeds to the next step S13, while when it is determined that the abnormal signal is output (N), the process proceeds to another step S16.

Subsequently, in step S13, the video signal resolution setting unit 9 determines whether or not there is the alarm information acquired by the alarm information acquisition unit 12. If it is determined that there is alarm information (Y), the process proceeds to the next step S14, while if it is determined that there is no alarm information (N), the process proceeds to another step S16.

Next, in step S14, the video signal resolution setting unit determines whether the emergency flag is set to 2. When it is determined that the emergency flag is set to 2 (Y), the process proceeds to the next step S14, while when it is determined that the emergency flag is set to 0 instead of 2 (N) Is another step S18.
Move to.

Next, in step S14, the video signal resolution setting unit sets the value of the emergency flag set to 2 to 0.

Further, in step S16, the video signal resolution setting unit 9 determines whether or not the emergency flag is set to 0. When it is determined that the emergency flag is set to 0 (Y), the next step S17
On the other hand, when it is determined that the emergency flag is not set to 0 but is set to 2 (N), the process proceeds to another step S18.

Next, in step S16, the video signal resolution setting unit 9 sets the emergency flag set to 0 to 1.

The emergency flag will now be described. When the emergency flag is set to 0, it indicates that the system operation is normal, and when the emergency flag is set to 1, the system operation is instantaneous. An abnormal state is indicated, and if set to 2, it indicates that the abnormal state of system operation continues.

In the next step S18, the video signal resolution setting unit 9 determines whether the emergency flag is set to 0 or not. When it is determined that the emergency flag is set to 0 (Y), the subsequent step S24.
On the other hand, if it is determined that the emergency flag is not set to 0 but is set to 1 or 2 (N), the process proceeds to the next step S19.

Subsequently, in step S19, the video signal resolution setting unit 9 determines whether or not the emergency flag is set to 1. When it is determined that the emergency flag is set to 1 (Y), the next step S2
On the other hand, when it is determined that the emergency flag is set to 2 (N), the process proceeds to another step S23.

Next, in step S20, the control unit 1
From the time (current time) when the rolling mill operation error recorded and accumulated in the database 7 is generated by issuing a video signal discard command to the database 7.
The digital video signal taken by 0 minutes before is read and discarded.

Then, in step 21, the control unit 1
Generates a video signal transfer command to the video signal temporary storage unit 3, and the digital video signal temporarily recorded and accumulated in the video signal temporary storage unit 3 from the present time to 10 minutes before Is read and the read digital video signal is transferred to the database 7 and recorded and stored therein. By performing such an operation, the resolution of the digital video signal for the past 10 minutes from the time of occurrence of the abnormal operation is in the state of the resolution when it is acquired by the video signal acquisition unit 2, that is, the highest signal quality remains. Records can be stored and it is possible to accurately analyze abnormal conditions.

In the next step S22, the video signal resolution setting unit 9 sets the emergency flag set to 1 to 2.

In step S23, the control unit 1
Generates a video signal transfer command to the video signal temporary storage unit 3, thereby reading the latest digital video signal temporarily recorded and stored in the video signal temporary storage unit 3, and reading the read digital video signal. Is transferred to the database 7 and recorded and stored there.

Next, in step S24, the video signal resolution setting unit 9 determines whether the rolled plate rolled according to the rolling schedule from the plant operation information acquired by the operation information acquisition unit 5 is a high-grade steel plate used for an automobile. To judge. When it is determined that the rolled plate is a high-grade steel plate (Y), the process proceeds to step S28, and when it is determined that it is not a high-grade steel plate (N), the next step S28 is performed.
Move to 25.

Next, in step S25, the video signal resolution setting unit 9 determines whether the rolled plate rolled according to the rolling schedule from the plant operation information acquired by the operation information acquisition unit 5 is a low-grade steel plate used for construction material. To judge. When it is determined that the rolled plate is a low grade steel plate (Y), the process proceeds to another step S27, while when it is determined that it is not a low grade steel plate (N), the next step S27 is performed.
Move to 26.

In step S26, the video signal resolution setting unit 9 determines that the rolled plate is a general steel plate that is neither a high-grade steel plate or a low-grade steel plate, and thus sets the number of colors of the digital video signal to 65,000. To do.

Further, in step S27, the video signal resolution setting unit 9 sets the number of colors of the digital video signal to 256 colors because it is determined that the rolled plate is a low grade steel plate.

Further, in step S28, the video signal resolution setting unit 9 sets the number of colors of the digital video signal to 16.7 million colors because it is determined that the rolled plate is a high-grade steel plate.

As described above, in steps S24 to S28, whether the rolled plate is a high-grade steel plate used for an automobile that needs to be monitored in detail based on the plant operation information acquired by the operation information acquisition unit 5, Alternatively,
A digital video signal to be recorded and stored in the database 7 for each type of steel sheet by determining whether it is a low-grade steel sheet used for construction materials or a general steel sheet that does not need to be monitored in more detail than a high-grade steel sheet. The number of colors is set, and the video signal when monitoring a high-grade steel plate that requires detailed observation of scratches on the surface of the rolling plate, etc. By changing the resolution of the monitored video signal to such an extent that the outline can be understood, it is possible to record and store the important video signal in detail while reducing the storage amount of the digital video signal in the database 7.

Next, in step S29, the video signal resolution setting unit 9 determines whether the operator operation event information acquired by the operation event acquisition unit 10 has been maintained for one minute or longer. When it is determined that the operator operation event information does not last for more than 1 minute (Y), the next step S30
On the other hand, when it is judged that the operator operation event information continues for 1 minute or more (N),
Then, the process proceeds to another step S33.

Next, in step S30, the video signal resolution setting unit 9 determines whether or not the operator operation event information acquired by the operation event acquisition unit 10 has continued for 5 minutes or more. When it is determined that the operator operation event information does not last for more than 5 minutes (Y), the next step S3
On the other hand, when it is determined that the operator operation event information continues for 5 minutes or more (N), the process proceeds to another step S32.

Here, the manual intervention by the operator will be explained. This manual intervention means that when a control device such as a rolling mill is in an automatic operating state, when the rolling mill is not functioning properly, for example, when the rolling mill is operating properly. This means that the operator performs a manual operation so that the rolling mill functions properly, that is, the entering angle of the rolled material is corrected, for example, when the entered entering angle of the rolled material is deviated.

In the subsequent step S31, the video signal resolution setting unit 9 sets the frame rate of the digital video signal to 10 frames / second because it is determined that there is no manual intervention by the operator.

Further, in step S32, the video signal resolution setting unit 9 determines that there is no manual intervention by the operator and that the influence of the manual intervention affects the rolling in time, so that the frame rate of the digital video signal is determined. Is set to 20 frames / sec.

Furthermore, in step S33, the video signal resolution setting unit 9 sets the frame rate of the digital video signal to 30 frames / second because it is determined that the operator's manual intervention is frequent.

These steps S29 to S3
In No. 3, when the operator operation event information is constantly supplied based on the operation event information that is acquired when the operator manually operates the control device acquired by the operator operation event acquisition unit 10, that is, the operator frequently performs manual intervention. Or if the operator's operation event information does not last for more than 1 minute, that is, if the manual intervention affects the rolling, or if the operator's operation event is 5 If it is not for more than a minute, that is, if there is no manual intervention, it is determined and the frame rate for recording and storing the digital video signal in the database 7 is set.

By carrying out such a setting, as in the case where the manual intervention of the operator frequently occurs, that is, in the state in which the quality of the rolled material is likely to deteriorate, Details of the digital video signal at which it must be monitored, such as when there is no manual operator intervention, i.e. when the mill is operating normally and the quality of the rolled material is less likely to deteriorate. To
By changing the resolution of each digital video signal to such an extent that the digital video signal at a time when it is not necessary to monitor it can be roughly understood, the amount of accumulated digital video signal in the database 7 is reduced, and Can be recorded and stored in detail.

Next, in step S34, the video signal resolution setting unit 9 determines whether or not the information indicating the work roll peripheral speed of the rolling mill in the plant control information acquired by the sensor information acquisition unit 6 is 0 m / sec. To judge. Then, when it is determined that the information indicating the work roll peripheral speed is 0 m / sec (Y), the process proceeds to the subsequent step S38, while it is determined that the information indicating the work roll peripheral speed is not 0 m / sec ( If N), the process proceeds to the next step S35.

Next, in step S35, the video signal resolution setting unit 9 sets the information indicating the work roll peripheral speed of the rolling mill in the plant control information acquired by the sensor information acquisition unit 6 from 0 m / sec to 10 m / sec. It is determined whether it is within the range of. When it is determined that the information indicating the work roll peripheral speed is within the range from 0 m / sec to 10 m / sec (Y), the process proceeds to another step S37, while the information indicating the work roll peripheral velocity is When it is determined that the value is not within the range of 0 m / sec to 10 m / sec (N), the process proceeds to the next step S36.

In the subsequent step S36, the video signal resolution setting unit 9 determines that the rolling is in the steady operation state, and thus the MP of the digital video signal is determined.
Set the EG compression rate to 1/70.

Further, in step S37, the video signal resolution setting unit 9 determines that the rolled material has bitten into the work roll, and therefore the MP of the digital video signal is determined.
Set the EG compression rate to 1/50.

Further, in step S38, the video signal resolution setting unit 9 sets the MPEG compression rate of the digital video signal to 1/100 because it is determined that the rolling operation has not been performed on the rolled material.

These steps S34 to S3
In No. 8, when the information indicating the work roll peripheral speed is 0 m / sec, that is, when the rolling is not yet performed, based on the information indicating the work roll peripheral speed of the rolling mill acquired by the sensor information acquisition unit 6. Or when the information indicating the work roll peripheral speed is between 0 m / sec and 10 m / sec,
That is, when the rolled material is bitten into the work roll, or when the information indicating the work roll peripheral speed is 10 m /
It is judged for a second or more, that is, if the rolling is proceeding in a steady operation state, and the digital image signal is stored in the database 7
The respective MPEG compression ratios when recording and accumulating are set.

Here, the biting of the rolled material into the work roll will be described. The state in which the rolled material starts to enter the rolling mill is called biting. Accidents are most likely to occur during this bite, for example, if the bite fails,
The rolled material follows an incorrect path without entering the work roll, and the rolled material damages the work roll or the rolled material destroys the rolling mill itself.

In addition, MPEG in digital video signals
The relationship between the compression rate and the signal quality of the digital video signal will be described. Usually, when the digital video signal is MPEG-compressed, if the MPEG compression rate is about 1/50, the digital video signal hardly deteriorates. If the MPEG compression rate is increased, the signal quality of the digital video signal will suddenly deteriorate.

FIGS. 6A and 6B are explanatory views showing an example of a display image when the MPEG compression rate of the digital video signal is changed.

FIG. 6A shows that the MPEG compression rate is 1/50.
6B is a display image when the image is displayed in FIG.
It is a display image when the compression rate is set to 1/100.

As shown in FIG. 6A, when the MPEG compression ratio of the digital video signal is set to 1/50, the display image is hardly deteriorated.
As shown in (b), MPEG has a compression ratio of 1/100.
The display image when turned on is considerably deteriorated. However, looking at the signal amount of the digital video signals recorded and accumulated in the database 7, the signal amount when the MPEG compression ratio is 1/100 is larger than the signal amount when the MPEG compression ratio is 1/50. About half.
That is, when the MPEG compression rate of the digital video signal is set high, the digital video signal hardly deteriorates, but the signal amount increases, and when the MPEG compression rate is set low, the deterioration of the digital video signal increases but the signal amount decreases. Become.

As described above, the MPEG of the digital video signal is
If the compression ratio is set, the resolution of the digital video signal at the time of biting of the rolled material, that is, at the time when the rolling mill is most likely to cause an accident and at which it must be monitored most becomes detailed, and the rolling mill When operation is stopped,
That is, the resolution of the digital video signal when there is little need to monitor the operation of the rolling mill is set to a level that can be roughly understood, and the digital image is more carefully monitored when the rolling mill is in the steady operation state, that is, when the rolling material is caught. By reducing the resolution of the digital video signal when it is not necessary to monitor the signal to a coarser resolution than when biting the rolled material, it is necessary to reduce the signal amount of the digital video signal recorded and stored in the database 7. It is possible to record and store digital video signals at a resolution of

Next, in step S39, the video signal resolution setting unit 9 determines that the component replacement record information indicating the replacement date and time of the backup roll in the plant maintenance information acquired by the maintenance information acquisition unit 11 is 24 hours from the present. Determine if it was previously acquired. Then, the component replacement record information indicating the replacement date and time of the backup roll is 2
When it is determined that the data has been acquired before the lapse of 4 hours (Y), the process proceeds to the subsequent step S41, while the component replacement record information indicating the replacement date and time of the backup roll is acquired before the lapse of 24 hours. If it is determined that the item is not the same (N), the process proceeds to the next step S40.

Next, in step S40, the video signal resolution setting unit 9 determines the MPEG of the digital video signal in the area where the backup roll is displayed in the display image.
Set the compression rate to 1/50. In this case, the area in which the backup roll is displayed is set in advance to an area having a size of 100 horizontal pixels × 100 vertical pixels at the upper left coordinate position (120, 50) of the area.

In the next step S41, the video signal resolution setting unit 9 determines whether the component replacement record information indicating the valve replacement date and time in the plant maintenance information acquired by the maintenance information acquisition unit 11 has passed 24 hours from the present. Determine whether it was acquired. When it is determined that the component replacement record information indicating the valve replacement date and time has been acquired before the lapse of 24 hours from the present (Y), the process proceeds to the subsequent step S43, while the valve replacement date and time is displayed. When it is determined that the component replacement record information is not obtained before the lapse of 24 hours (N), the next step S42.
Move to.

Subsequently, in step S42, the video signal resolution setting unit 9 sets the MPEG compression ratio of the digital video signal in the area where the valve is displayed in the display image to 1 /.
Set to 50. In this case, the area in which the valve is displayed is set in advance to an area having a size of 30 horizontal pixels × 50 vertical pixels at the coordinate position (10, 120) at the upper left of the area.

These steps S39 to S4
In No. 2, the elapsed time since the backup roll was replaced is less than 24 hours based on the part replacement record information indicating the valve replacement date and time in the plant maintenance information acquired by the maintenance information acquisition unit 11, that is, , When the accident is relatively easy to occur, or the backup roll has been replaced for more than 24 hours, that is, the normal operation state has occurred and the accident is relatively unlikely to occur. MP for the digital video signal only in the area where the valve of the display image is displayed.
The EG compression rate is set.

FIGS. 7A and 7B are explanatory views showing an example of a display image when the MPEG compression rate of the digital video signal is changed.

In FIG. 7A, the MPEG compression rate of the digital video signal in the area of the backup roll portion in the display image is set to 1/50, and the MPEG compression rate of the digital video signal in the other areas is set to 1/100. FIG. 7B shows the case where the MPEG compression rate of the digital video signal in the area of the backup roll portion is set to 1/50 and the MPEG compression rate of the digital video signal in the area of the valve portion is set to 1/50. When set to.

As described above, when the part to be monitored is determined in the display image, the signal compression amount of the digital video signal is changed by changing the MPEG compression rate of the digital video signal only in the region to be monitored. As compared with the case where the image is compressed uniformly over the entire display screen with a small MPEG compression ratio, not only the portion to be monitored can be monitored in detail, but the signal amount of the digital video signal is uniformly increased over the entire display screen. The signal amount of the digital video signal can be significantly reduced as compared with the case of compressing at the compression rate.

Next, in step S43, the video signal resolution conversion processing section 8 receives the parameters relating to the resolution set in the video signal resolution setting section 9, for example, the frame rate, the MPEG compression rate, the number of colors, etc. The latest digital video signal temporarily stored in the temporary storage unit 3 is read out, and conversion processing is performed so that the read digital video signal has the resolution set by the video signal resolution setting unit 9.

Next, in step S44, the video signal resolution conversion processing section 8 carries out conversion processing of the resolution of the digital video signal, and then transfers the digital video signal to the database 7 and records and stores it there.

Finally, in step S45, the control unit 1 issues a video signal transfer command to the video signal temporary storage unit 3, and the current video signal temporarily stored in the video signal temporary storage unit 3 is thereby generated. The digital video signal from the point of time to 10 minutes before is read, and the read digital video signal is discarded. Then, after discarding the digital video signal, the process returns to the first step S2, and the operation of shifting to step S2 is executed again.

As described above, according to the image storage system of the present embodiment, when the digital image signal obtained by photographing the operating state of the rolling mill (control device) is received, various control information input, for example, plant operation. Database (recording medium) corresponding to the contents of information, plant control information, event information, plant maintenance information, alarm information, etc.
Since the resolution of the digital video signal to be recorded and stored in 7 is set to a good state to be recorded and stored in the recording medium, or the resolution is made lower than that in the normal state to be recorded and stored in the recording medium. In comparison with a case where digital video signals are sequentially stored in a database (recording medium) 7 at a resolution in a normal state, the amount of digital video signal (recording) can be significantly reduced, and a large amount of database (recording medium) can be obtained. Not only 7 is not necessary, but the labor required for exchanging the database (recording medium) 7 is reduced, and important operating scenes in the operating state of the rolling mill (control equipment) are stored in the database (recording medium) 7. It is possible to avoid the situation of not being recorded.

In the above embodiment, the control equipment is described as an example of a rolling mill used in a steel plant system, but the control equipment according to the present invention is limited to the rolling mill as described above. However, it may be other control equipment used in a steel plant system,
Further, it may be a control device used in a system other than the steel plant system, for example, a monitoring device for an intersection in an ITS (Intelligent Transport System).

[0097]

As described above, according to the present invention, the video signal resolution setting unit can capture the operating state of the control device based on various control information individually fetched by the plurality of control information acquisition units. The received digital video signal is
Whether it was a filming of an important scene or another scene,
That is, it is determined whether or not a scene that is not so important is shot, and only when it is determined that the digital video signal is a shot of an important scene, the resolution of the digital video signal stored in the recording medium is in a good state. Therefore, the details of the operation mode can be understood. On the other hand, when it is determined that the digital video signal is a picture of other scenes, the resolution of the digital video signal stored in the recording medium is lower than that in the normal state. In this state, the operation mode is roughly understood, and the resolution of the digital video signal is recorded in the normal state by appropriately lowering the resolution of the digital video signal from the normal state. The amount of digital video signals stored in the recording medium is significantly smaller than that in the case where the number of recording media is increased. Not only not necessary, labor is much less necessary to replace the recording medium, on which,
There is an effect that it is possible to avoid a situation in which an important scene in the operating state of various control devices is missed in a recording medium.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a video storage system according to the present invention.

FIG. 2 is the first part of a flowchart showing an example of the operational history of the embodiment shown in FIG.

FIG. 3 is a second part of the flowchart showing an example of the operation history of the embodiment shown in FIG.

FIG. 4 is a third part of the flowchart showing an example of the operation history of the embodiment shown in FIG.

5 is the last part of the flowchart showing an example of the operational history of the embodiment shown in FIG. 1. FIG.

FIG. 6 is an explanatory diagram showing a display image when the MPEG compression ratios of digital video signals are set differently in the embodiment shown in FIG. 1.

7 is an explanatory diagram showing a display image when the MPEG compression rate of a part of the digital video signal is set to be different from the MPEG compression rates of the other areas in the embodiment shown in FIG. Is.

[Explanation of symbols] 1 control unit 2 Video signal acquisition unit 3 Video signal temporary storage 4 Abnormality diagnosis section 5 Operation information acquisition department 6 Sensor information acquisition unit 7 Database (recording medium) 8 Video signal resolution conversion processing unit 9 Video signal resolution setting section 10 Television (TV) camera 11 Operation event information acquisition unit 12 Maintenance information acquisition section 13 Alarm information acquisition section

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-63133 (JP, A) JP-A-6-121315 (JP, A) JP-A-9-93534 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H04N 5/91-5/956 G09G 5/00

Claims (4)

(57) [Claims] 1. The operation of a rolling mill used in a steel plant.
Process digital video signals and store in database
In the image storage system, the steel plate rolled by the rolling mill is a high-grade steel plate, a low-grade steel plate,
Or operation information to acquire information on whether it is a general steel plate
Rolling rolled from the acquisition unit and the information acquired by the operation information acquisition unit
Whether the plate is a high-grade steel plate, a low-grade steel plate, or a general steel plate
And the rolling plate was judged to be a high-grade steel plate.
In this case, the number of colors of the digital video signal is set to n1,
If the rolled plate is judged to be a low grade steel plate, the digitizer
Set the number of colors of the video signal to n2 (n2 <n1),
If the rolled sheet is judged to be a general steel sheet, the digital image
Video signal that sets the number of signal colors to n3 (n2 <n3 <n1)
Signal resolution setting section and the digital video signal by the video signal resolution setting section.
Video signal resolution conversion to convert to the preset resolution
And a processing unit and the data converted by the video signal resolution conversion processing unit.
A video storage system , comprising: a database for recording digital video signals . 2. The image storage system according to claim 1.
The high-grade steel plate is for automobiles, and the low-grade steel plate is for construction.
Steel plate for steel, the general steel plate is a high-grade steel plate or a low-grade steel plate
An image storage system characterized by being a steel plate other than . 3. Operation of a rolling mill used in a steel plant
Process digital video signals and store in database
And a sensor information for acquiring the peripheral speed of the work rolls of the rolling mill.
In the rolling mill from the acquisition unit and the information acquired by the sensor information acquisition unit
When the rolled material to be rolled is caught in the work roll
If it is caught,
If it is determined that the digital video signal is
When compressing, set the first compression rate and get caught
If it is determined that it is not the case, the digital image
When compressing the signal, the second compression ratio (second compression ratio <
The video signal resolution setting unit for setting the first compression ratio) and the digital video signal by the video signal resolution setting unit.
Video signal resolution conversion to convert to the preset resolution
And a processing unit and the data converted by the video signal resolution conversion processing unit.
A database for recording digital video signals, and a video storage system. 4. The video storage system according to claim 3.
And when the peripheral speed v of the work roll is 0 m / s <v <10 m / s , the rolled material bites into the work roll.
A video storage system, which is characterized by determining that it is the case that it is lost .