JP2023090229A - Moving image storage device, gas monitoring system, control method for moving image storage device, and program - Google Patents

Abstract

To provide a moving image storage device that can save video data in the event of an abnormality at low cost, a gas monitoring system, a control method for moving the image storage device, and a program.SOLUTION: A moving image storage device includes a storage processing unit that stores moving image data in a reproducible state as a moving image on the basis of image data, and a determination unit that determines, on the basis of a predetermined priority, the type of image data for which the storage processing is performed during a stop time from when an abnormality occurs until when the storage processing unit becomes unable to perform the storage processing due to the abnormality from among a plurality of types of image data when a specified abnormality occurs, and causes the storage processing unit to perform the storage processing on the determined type of image data.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to a moving image storage device, a gas monitoring system, a control method for a moving image storage device, and a program, which are used for applications such as gas monitoring.

Generally, a plurality of pieces of image data are generated and arranged in chronological order to generate moving image data. In order to generate reproducible video data based on multiple image data, add information for correctly reproducing multiple image data arranged in chronological order and save it as one video data. Preservation processing may be required for

For example, if the video data is not saved correctly due to a power failure, etc., even if multiple frames of image data remain in the storage, it may not be possible to play back the image data as a video. can occur. Techniques disclosed in Patent Documents 1 and 2 are known as techniques for avoiding such a situation.

Japanese Patent Application Laid-Open No. 2002-200000 discloses a technique for instantaneously saving a captured moving image and a still image in anticipation of a sudden interruption in power supply. Further, in Patent Document 2, temporary moving image data is periodically and temporarily stored in a storage, and when an abnormality is detected, the temporary moving image data is copied to a storage area of the storage and permanently stored. Techniques are disclosed.

JP 2007-259248 A Japanese Patent Application Laid-Open No. 2005-151071

In the technique disclosed in Patent Document 1, a plurality of pieces of relatively short moving image data are generated, so a large amount of resources are required to execute the saving process for each piece of moving image data. In addition, since still image data and moving image data are alternately stored in the same data stream, complex processing is required to extract and reproduce moving image data. Furthermore, with the technique disclosed in Patent Document 1, it is difficult to generate long-time moving image data.

The technology disclosed in Patent Document 2 requires a temporary storage area for periodically storing temporary moving image data, which puts pressure on the storage capacity, resulting in the need to prepare a large-capacity storage, which is costly. It takes a lot.

An object of the present disclosure is to provide a video storage device, a gas monitoring system, a control method for the video storage device, and a program that can save video data in the event of an abnormality at low cost.

The moving image storage device of the present disclosure includes a storage processing unit that performs storage processing for storing moving image data in a reproducible state as a moving image based on the image data, and a plurality of types of image data when a predetermined abnormality occurs. Among them, the type of image data to be stored during the stop time from when the abnormality occurs until when the storage processing unit becomes unable to perform the storage process due to the abnormality is determined based on a predetermined priority. and a determination unit that determines the image data of the determined type, and causes the storage processing unit to perform the storage processing on the determined type of image data.

A gas monitoring system of the present disclosure includes an imaging device that generates an infrared image and a visible image of a gas monitoring target area, and the moving image storage device, wherein the moving image storage device stores the infrared image and the visible image. and an image processing unit that generates the plurality of types of moving image data for gas monitoring based on.

A control method for a moving image storage device according to the present disclosure is a control method for a moving image storage device that performs storage processing for storing moving image data in a reproducible state as a moving image based on image data, wherein occurs, among a plurality of types of image data, storage processing is performed during a stop time from the occurrence of the abnormality until the moving image storage device becomes unable to perform the storage processing due to the abnormality. The type of image data is determined based on a predetermined order of priority, and control is performed to cause the determined type of image data to undergo the storage process.

The program of the present disclosure is a program that is executed by a computer that performs storage processing for storing video data in a reproducible state as a video based on image data, and when a predetermined abnormality occurs in the computer, Among the plurality of types of image data, the type of image data for which the storage process is performed during the stop time from when the abnormality occurs until the computer becomes unable to perform the storage process due to the abnormality is selected as a predetermined type. It is determined based on the order of priority, and the storage processing is performed on the determined type of image data.

According to the present invention, it is possible to save moving image data in the event of an abnormality at low cost.

Block diagram of gas monitoring system A diagram showing an example of display time information in a list format A diagram showing an example of display count information in a list format Flowchart for explaining the operation during normal operation of the video storage device Flowchart for explaining priority order determination processing by a determination unit Flowchart for explaining the operation when a power failure occurs in the video storage device

Embodiments of the present disclosure will be described below with reference to the drawings. However, the scope of the invention is not limited to the illustrated example. In addition, in the following description, the same reference numerals are given to the components having the same function and configuration, and the description thereof will be omitted.

FIG. 1 is a block diagram of a gas monitoring system 1. As shown in FIG. The gas monitoring system 1 captures an image of a monitoring area including, for example, a monitoring target (plant, etc.) of a gas production facility, performs image processing for monitoring gas leaks on the captured image, and generates a moving image for gas monitoring. Generate, save and play generated videos. Examples of types of gases that can be monitored by the gas monitoring system 1 (hereinafter referred to as target gases) include hydrocarbon gases such as methane, ethane, propane, and butane.

As shown in FIG. 1 , the gas monitoring system 1 includes an imaging device 2 and a video storage device 3 . The imaging device 2 and the moving image storage device 3 are connected via a cable 4 . Note that the imaging device 2 may be connected to the moving image storage device 3 via wireless communication. Also, the imaging device 2 may be connected to the moving image storage device 3 via a network such as the Internet.

[Imaging device]
The imaging device 2 is, for example, a portable camera device. The imaging device 2 may be a camera device fixed at a predetermined position. The operation of the imaging device 2 may be controlled by, for example, a control unit 31 of the moving image storage device 3 described later, or may be controlled by a processor or the like included in the imaging device 2 .

The imaging device 2 starts imaging, for example, when an instruction to start imaging is input from the user of the gas monitoring system 1 via the operation input unit 33 of the moving image storage device 3 .

The imaging device 2 has an infrared imaging section 21 and a visible light imaging section 22 .

<Infrared imaging unit>
The infrared imaging unit 21 has an infrared filter and an infrared sensor, and generates infrared image data by causing the infrared sensor to form an image of infrared rays incident from a monitoring area, which is a subject. The infrared image data generated by the infrared imaging section 21 indicates the temperature distribution of the monitored area.

The infrared filter allows only infrared rays within a predetermined wavelength band to pass through. The pass wavelength band of the infrared filter may be set according to the absorption wavelength band of the gas to be detected. For example, if the target gas is methane, the pass wavelength band is set to the middle wavelength range of 3.2 to 3.4 μm.

The infrared sensor receives infrared rays and generates infrared image data. The infrared imaging unit 21 captures an image of the monitoring area in synchronization with the visible light imaging unit 22 to generate infrared image data for each frame, and sequentially outputs the infrared image data of a plurality of frames to the moving image storage device 3. do.

<Visible light imaging unit>
The visible light imaging unit 22 has an infrared cut filter and a visible light sensor, and forms an image of visible light incident from a monitoring area, which is a subject, on the visible light sensor to generate visible image data.

The visible light sensor is, for example, a CMOS (Complementary Metal Oxide Semiconductor) image sensor, which receives visible light and generates visible image data.

Such a visible light imaging unit 22 captures an image of the monitoring area in synchronization with the infrared imaging unit 21 to generate visible image data for each frame, and sequentially transfers the visible image data of a plurality of frames to the moving image storage device 3. Output.

[Video storage device]
Using the infrared image data and the visible image data input from the imaging device 2, the video storage device 3 visualizes the gas generated (leaked) in the monitoring area, and stores a plurality of types of gas monitoring videos for gas monitoring. is generated and saved. In addition, the moving image storage device 3 can also reproduce the generated gas monitoring moving image or the stored gas monitoring moving image.

The video storage device 3 is, for example, a mobile terminal such as a tablet terminal, a smart phone, a laptop terminal, or a wearable terminal, or a stationary PC (Personal Computer).

The moving image storage device 3 has a control unit 31 , and a display unit 32 , an operation input unit 33 , a storage unit 34 , and a processing unit 35 as functional blocks controlled by the control unit 31 .

<Control section>
The control unit 31 has a CPU 311 (Central Processing Unit) as an arithmetic device, a RAM 312 (Random Access Memory), a ROM 313 (Read Only Memory) as a main storage device, and the like, and controls the operation of each functional block of the video storage device 3. to control. The ROM 313 stores basic programs and basic setting data. The CPU 311 centrally controls the operation of each functional block of the gas monitoring system 1 by reading out a program corresponding to the processing content from the ROM 313 or the storage unit 34, loading it into the RAM 312, and executing the loaded program. Also, the control unit 31 may control the operation of the imaging device 2 . In this manner, the control unit 31 performs overall control of the gas monitoring system 1 by controlling the imaging device 2, the display unit 32, the operation input unit 33, and the storage unit 34 according to their respective functions.

In the present embodiment, the function of each functional block is realized by cooperation between each piece of hardware constituting the functional block and the control unit 31 . Note that at least some or all of the functional blocks of the moving image storage device 3 may be implemented in software by the control unit 31 executing a program.

<Display part>
The display unit 32 is, for example, a display using liquid crystal or organic EL (Electro-Luminescence). The display unit 32 may be, for example, a flat panel display with a touch panel and may also serve as the operation input unit 33 .

The display unit 32 displays various images based on display signals from the processing unit 35 . Specifically, the display unit 32 displays a monitoring screen or the like for the user to visually monitor the gas in the monitoring area.

<Operation input part>
The operation input unit 33 is an input unit such as a touch panel as described above. Also, the operation input unit 33 may be an input device other than a touch panel, such as a mouse, keyboard, trackball, switch, or microphone.

The operation input unit 33 performs an operation for causing the imaging device 2 to start imaging the monitoring area, an operation for displaying a gas monitoring image generated based on the captured image, an operation for reproducing a gas monitoring video recorded in the past, and the like. accept.

<Memory unit>
The storage unit 34 is, for example, a storage device such as a nonvolatile semiconductor memory (so-called flash memory), HDD (Hard Disk Drive), SSD (Solid State Drive). The storage unit 34 may be a disk drive that drives an optical disk such as a CD (Compact Disc) or a DVD (Digital Versatile Disc), or a magneto-optical disk such as an MO (Magneto-Optical disk) to read and write information. Further, for example, the storage unit 34 may be a memory card such as a USB (Universal Serial Bus) memory or an SD (Secure Digital) card.

The storage unit 34 includes a temporary memory corresponding to a so-called buffer memory and a main memory corresponding to a main memory. Temporary memory may have less storage capacity than main memory. Certain data transmitted from other functional blocks of the motion picture storage device 3 to the storage unit 34 is stored in the temporary memory before being stored in the main memory. Then, at a predetermined timing, the data stored in the temporary memory is written into the main memory. Thereby, the data is stored in the storage unit 34 . Note that the predetermined timing is when the amount of data stored in the temporary memory exceeds a predetermined threshold capacity, or when a storage process, which will be described later, is executed.

Since the storage unit 34 has a temporary memory and a main memory in this way, there is no difference between the transmission speed of transmission from other functional blocks of the moving image storage device 3 to the storage unit 34 and the writing speed to the storage unit 34. can absorb the speed difference when there is Note that if the writing speed to the storage unit 34 is sufficiently fast relative to the transmission speed, the storage unit 34 may have only the main memory without the temporary memory. In this case, data transmitted from other functional blocks are written directly to the main memory.

<Processing unit>
The processing unit 35 is composed of a plurality of dedicated hardware (electronic circuits) such as a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), or a PLD (Programmable Logic Device). Each piece of hardware corresponds to, for example, each of a plurality of functions possessed by the processing unit 35 . Also, one piece of hardware may implement a plurality of functions.

The processing unit 35 has an image processing unit 351 , a storage processing unit 352 , a determining unit 353 , a reproducing unit 354 and a power management unit 355 . Each function of the processing unit 35 is realized under the control of the control unit 31 .

<Image processing part>
The image processing unit 351 receives, from the infrared imaging unit 21, multiple frames of infrared image data in time series in the monitoring area. The image processing unit 351 also receives a plurality of time-series visible image data in the monitoring area from the visible light imaging unit 22 .

The image processing unit 351 performs predetermined image processing on the infrared image data and the visible image data for each frame to generate multiple types of image data for gas monitoring. Examples of multiple types of image data for gas monitoring include the following nine types.
(1) Infrared image data (2) Visible image data (3) Infrared gas cloud image data (4) Temperature image data (5) Visible gas cloud image data (6) Gas-enhanced image data (7) Gas-enhanced image + Visible image data (8) Contrast-enhanced image data (9) Contrast-enhanced image + visible image data

The infrared image data is image data acquired from the infrared imaging section 21 . The visible image data is image data obtained from the visible light imaging section 22 .

Infrared gas cloud image data is image data in which pixels corresponding to leaked gas (hereafter referred to as gas-corresponding pixels) among the pixels constituting the infrared image data are given a specific color (red, etc.). . If a gas leak occurs in the monitoring area due to the leaked gas, a temperature change will occur at that location in the infrared image data. When the temperature changes in the monitoring area, the infrared image data of the monitoring area changes in luminance. For this reason, the image processing unit 351 detects changes in brightness in the infrared image data of a plurality of frames, and if a pixel whose brightness changes is detected, regards the pixel as a gas-equivalent pixel, and assigns a color to the pixel. to generate infrared gas cloud image data.

The temperature image data is image data expressed in RGB using a color palette (color temperature) prepared in advance based on the infrared image data of the monitored area.

The visible gas cloud image data is image data obtained by superimposing infrared gas cloud image data based on infrared image data generated at the same timing on visible image data generated at a certain timing.

Gas-enhanced image data is image data obtained by removing frequency components caused by background temperature and frequency components caused by noise generated during imaging from infrared gas cloud image data and emphasizing only gas-equivalent pixels. The image processing unit 351 generates gas-enhanced image data by, for example, filtering out low-frequency components caused by the background temperature and high-frequency components caused by noise from the infrared gas cloud image data.

The gas-enhanced image+visible image data is image data obtained by superimposing gas-enhanced image data based on infrared image data generated at the same timing on visible image data generated at a certain timing.

The contrast-enhanced image data is image data obtained by taking a difference between image data of different frames and performing contrast enhancement processing.

The contrast-enhanced image+visible image data is image data obtained by superimposing contrast-enhanced image data based on infrared image data generated at the same timing on visible image data generated at a certain timing.

The image processing unit 351 outputs various image data generated as described above to the storage processing unit 352 for each frame. In the present embodiment, the image processing unit 351 generates nine types of image data as described above, but the present disclosure is not limited to these nine types, and may generate more or fewer types of image data. may

<Save processing unit>
The storage processing unit 352 performs storage processing on each of a plurality of types of image data input from the image processing unit 351, which will be described later, in accordance with a predetermined trigger. Triggered by the storage processing unit 352 to perform the storage processing, for example, the user performs an operation to end the generation of the video data for gas monitoring via the operation input unit 33, or the power supply to the video storage device 3 is turned on. This is when a predetermined anomaly such as an anomaly occurs.

In the present embodiment, the storage process means writing multiple frames of image data temporarily stored in a temporary memory to the main memory, adding related information to the multiple frames of image data, and closing the data as one moving image data. It is a process to

In general, simply arranging the image data for each frame input from the image processing unit 351 in chronological order cannot reproduce the image data as a moving image. In order for multiple pieces of image data to be reproduced correctly as a moving image, it is necessary to add information (hereinafter referred to as moving image-related information) indicating at which frame the moving image data starts and ends at which frame. .

As described above, the image data for each frame image-processed by the image processing unit 351 is temporarily stored in the temporary memory until a predetermined timing comes. When executing the saving process, the save processing unit 352 first writes the image data for each frame stored in the temporary memory to the main memory. Then, the storage processing unit 352 adds moving image-related information to the multiple frames of image data written in the main memory, and closes them as one piece of moving image data. Thereby, reproducible moving image data is generated. The save processing unit 352 then writes the generated moving image data into the main memory of the storage unit 34 . This completes the saving process.

Note that the saving process is executed for each type of image data.

<decision part>
The determining unit 353 determines a plurality of functions based on the time until each functional block of the moving image storage device 3 stops operating when a predetermined abnormality such as a power failure occurs in the moving image storage device 3 (hereinafter referred to as a stop time). Among the types of video data, the type to be saved during the stop time is determined.

A specific example is given and explained. For example, when the power source of the video storage device 3 is a storage battery, the power failure refers to a state in which the remaining battery level is less than a predetermined threshold. Alternatively, the power failure refers to a state in which the temperature of the storage battery has increased abnormally.

When such a power failure occurs, the power management unit 355 , which will be described later, stops the operation of each unit of the moving image storage device 3 and transmits an operation stop signal for shutting down the entire moving image storage device 3 . Note that there is a slight time lag (stop time) from when the power management unit 355 transmits an operation stop signal in response to the occurrence of an abnormality until each functional block actually ends its operation. The stop time is, for example, several milliseconds to several seconds. The stop time is actually measured by an experiment or the like when the moving image storage device 3 is designed or manufactured, for example, and is stored in advance in the storage unit 34 as stop time information. If the stop time differs depending on the type of power failure, the stop time information is generated in association with the type of power failure. The stop time information is transmitted to the determination unit 353 together with the operation stop signal by the power management unit 355 when a power failure occurs.

As described above, in the moving image storage device 3, the image processing unit 351 generates multiple types of image data, and the storage processing unit 352 stores each of the multiple types of image data based on a predetermined trigger. conduct. A short storage processing time is required for the storage processing unit 352 to complete the storage processing for one type of image data after starting the storage processing. Storage processing time information indicating the storage processing time is pre-stored in the storage unit 34 .

The save processing time is specified, for example, as follows. As described above, the image data that has undergone image processing by the image processing unit 351 is temporarily stored in the temporary memory. Since the saving process requires time to write the image data stored in the temporary memory to the main memory, the saving process time _Tw can be calculated by the following equation (1).
T _w =D/S _w +aT _a (1)

In equation (1), D is the total amount of image data stored in the temporary memory at that point in time, _Sw is the writing speed to the main memory, and _Ta is the number of images written by the storage processing unit 352 to the main memory. This is the time required for processing to add moving image related information to the image data and close it as one piece of moving image data. Sw _{and Ta} are fixed values, for example, and may be measured by experiments or the like when the moving image storage device 3 is designed or manufactured, and may be stored in the storage unit 34 in advance. The coefficient a is the number of types of image data to be saved. That is, a=9 in this embodiment.

If the predetermined trigger is the operation of the operation input unit 33 by the user, the storage processing unit 352 completes the storage processing for all types of image data without any problem because the stop time does not need to be considered. be able to. However, when the saving process is triggered by a power failure, it is not always possible to complete the saving process for all types of image data during the stop time.

For this reason, the determining unit 353 determines in advance which type of image data among the plurality of types of image data should be preferentially saved when a power failure occurs. Make decisions based on priorities.

The priority order is determined in advance by the determination unit 353 performing a priority order determination process, which will be described later. The determination unit 353 generates priority information indicating the priority determined in the priority determination process, and causes the storage unit 34 to store the priority information.

Alternatively, the priority may be determined in advance by the user, for example, and priority information indicating the priority input via the operation input unit 33 may be stored in the storage unit 34 .

<Playback part>
The reproduction unit 354 causes the display unit 32 to display each frame based on one of the plurality of types of image data generated by the image processing unit 351 . Alternatively, the reproducing unit 354 reproduces past moving image data stored in the main memory of the storage unit 34 and causes the display unit 32 to display the data. The type of image data (moving image data) displayed on the display unit 32 by the playback unit 354 is determined by the user's operation via the operation input unit 33, for example.

The type of image data (moving image data) displayed on the display unit 32 by the reproduction unit 354 may be one type or a plurality of types. For example, one type of main image data (moving image data) may be displayed in a large size, and several other types of image data (moving image data) may be displayed in a small size.

The reproduction unit 354 stores the type of image data (moving image data) displayed on the display unit 32 and the display time (reproduction time) of the image data (moving image data) in the storage unit 34 as display time information in association with each other. Let FIG. 2 is a diagram showing an example of display time information in a list format. FIG. 2 shows the relationship between the type of image data (moving image data), the recording time for each type, and the display time for each type.

Alternatively, the reproducing unit 354 stores the type of image data (moving image data) displayed on the display unit 32 and the number of times the image data (moving image data) is displayed (the number of times of reproduction) in the storage unit 34 as information in association with each other. Let FIG. 3 is a diagram showing an example of display count information in a list format. FIG. 3 shows the relationship between the type of image data (moving image data), the number of times of recording for each type, and the number of times of displaying for each type.

The reproducing unit 354 may generate either one of the display time information and the display count information, or may generate both of them. Based on at least one of the display time information and the display count information, the determination unit 353 performs priority order determination processing, which will be described later.

<Power management part>
The power management unit 355 manages the power of the moving image storage device 3 . In this embodiment, as described above, the power source of the moving image storage device 3 is the storage battery. The power management unit 355 manages the remaining amount of the storage battery, the operating temperature, and the like. When a power failure occurs in the storage battery, the power management unit 355 transmits an operation stop signal to each unit of the moving image storage device 3 to stop the operation, thereby shutting down the entire moving image storage device 3 . As described above, the stop time information is attached to the operation stop signal. As described above, the power failure refers to a state in which the remaining battery level is less than a predetermined threshold value, or a state in which the temperature of the storage battery has risen above a predetermined threshold temperature.

[Example of operation]
Next, an operation example of the moving image storage device 3 will be described.

<During normal operation>
FIG. 4 is a flowchart for explaining the operation of the moving image storage device 3 during normal operation. In this embodiment, normal operation means operation when no power failure occurs.

In step S1, the operation input unit 33 receives an operation for starting recording of the gas monitoring area by the user.

In step S<b>2 , the image processing unit 351 acquires visible image data and infrared image data for each frame from the imaging device 2 .

In step S3, the image processing unit 351 performs image processing on the visible image data and the infrared image data to generate multiple types of image data.

In step S4, the storage unit 34 stores the image data for each frame in the temporary memory for each type.

In step S<b>5 , the playback unit 354 causes the display unit 32 to display the type of image data selected by the user from among the image data being recorded, in accordance with the user's operation on the operation input unit 33 . Alternatively, when the user selects reproduction of past moving image data stored in the storage unit 34 , the reproducing unit 354 causes the display unit 32 to reproduce the type of moving image data selected by the user.

In step S6, the reproduction unit 354 displays at least one of display time information indicating the display time (playback time) of the image data (moving image data) displayed on the display unit 32 and display count information indicating the display count (playback count). is generated and stored in the storage unit 34 .

In step S7, the operation input unit 33 determines whether or not the user has performed an operation to end recording. If it is determined that there has been an operation to end recording (step S7: Y), the process proceeds to step S8; otherwise (step S7: N), the process returns to step S2.

In step S<b>8 , the storage processing unit 352 executes storage processing for each type of image data accumulated in the temporary memory of the storage unit 34 . As a result, all types of moving image data are stored in the main memory of the storage unit 34 .

<Priority determination process>
FIG. 5 is a flowchart for explaining priority order determination processing by the determination unit 353 . The priority order determination process is a process for determining in advance (before the power failure actually occurs) the priority of multiple types of image data to be saved during the stop time when a power failure occurs. be.

In this embodiment, the timing at which the priority determination process is performed is not particularly limited. The priority order determination process may be performed periodically, such as once a day. In addition, the priority order determination process is performed after the user turns off the power of the moving image storage device 3 after the creation of the moving image data for gas monitoring in the moving image storage device 3 is completed. It may be performed until the entire video storage device 3 is shut down.

In step S<b>11 , the determination unit 353 acquires at least one of display time information and display count information from the storage unit 34 .

In step S12, the determining unit 353 determines priority based on at least one of the display time information and the display count information. The decision unit 353 decides the order of priority, for example, in descending order of display time (playback time). Alternatively, the determination unit 353 determines the priority in descending order of the number of times of display (the number of times of reproduction). The determining unit 353 may determine the order of priority using both the display time information and the display count information.

In step S<b>13 , the determination unit 353 generates priority information indicating the priority determined in step S<b>12 and stores the information in the storage unit 34 .

<Operation when power failure occurs>
FIG. 6 is a flow chart for explaining the operation when a power failure occurs in the moving image storage device 3 .

In step S21, the power management unit 355 detects that a power failure has occurred.

In step S<b>22 , the power management unit 355 transmits an operation stop signal and stop time information to each unit of the moving image storage device 3 to stop the operation and shut down the entire moving image storage device 3 . Note that the stop time information may be transmitted only to the determination unit 353 instead of being transmitted to each unit of the moving image storage device 3 .

In step S23, upon receipt of the operation stop signal, the determination unit 353 determines the type of image data to be stored among the plurality of types of image data based on the stop time information, the storage processing time information, and the priority information. do.

Specifically, the determining unit 353 calculates the number of types of image data that can be saved by dividing the stop time by the save processing time, and the It is determined that the type of image data is to be saved. If the storage processing time differs depending on the type of image data, the determination unit 353 adds the storage processing time in order of priority, and the image data of the type until the total storage processing time exceeds the stop time. It decides to perform the saving process for .

In step S24, the storage processing unit 352 performs storage processing on the image data of the type determined by the determination unit 353 in step S23, and causes the storage unit 34 to store the image data as moving image data.

In step S25, each unit of the moving image storage device 3 stops operating in response to the operation stop signal, and the entire moving image storage device 3 is shut down.

In this way, when a power failure occurs, it is possible to cause image data of a higher priority type to be saved based on the stop time information, save processing time information, and priority order information. As a result, image data of a type with a high priority can be reproduced without any problem after the power failure is recovered.

<Action, effect, etc.>
As described above, the moving image storage device 3 of the present disclosure includes the storage processing unit 352 that performs storage processing for storing moving image data in a reproducible state as a moving image based on the image data, and the 2, among the plurality of types of image data, the type of image data for which the storage processing is performed during the stop time from when an abnormality occurs until the storage processing unit 352 becomes unable to perform the storage processing due to the abnormality, and a determination unit 353 that determines based on a predetermined priority and causes the storage processing unit 352 to perform storage processing on the determined type of image data.

With such a configuration, among a plurality of types of image data, a type of image data having a high priority, such as image data that a user spends a long time viewing, is preferentially stored and stored as moving image data. be able to. As a result, it is possible to avoid a situation in which image data of a type with a high priority is lost due to an unexpected abnormality occurring in the moving image storage device 3 . Therefore, it is possible to avoid a situation in which a moving image cannot be browsed even though it has been shot for image data of a type with a high priority. In addition, image data with a high priority can be saved in the same manner as in normal operation, so when long-time recording is performed, long-time video data can be saved without problems. can.

Further, according to the moving image storage device 3 of the present disclosure, a method of storing backup moving image data in the storage unit 34 is not adopted. In the moving image storage device 3 of the present disclosure, it is necessary to store multiple types of moving image data in the storage unit 34 based on multiple types of image data. In this case, a storage area for backup is required for each of the plurality of types of moving image data, and it is necessary to prepare a very large storage capacity in the storage section 34 . Since the present disclosure does not employ a method of storing backup moving image data in the storage unit 34, there is no need to prepare an extra storage area in the storage unit 34 for storing backup moving image data. Therefore, the manufacturing cost of the moving image storage device 3 can be suppressed. Needless to say, a storage device for backing up moving image data may be provided outside the moving image storage device 3, and the moving image data recorded by the moving image storage device 3 may be backed up in the backup storage device.

In addition, in the moving image storage device 3 of the present disclosure, the priority order is determined based on the display time or display count for each type of image data that the user is viewing during recording. As a result, it is possible to save the image data of the type that the user often browses, which improves usability for the user.

<Modification>
In the above-described embodiment, an example has been described in which the moving image storage device 3 stores moving image data for gas monitoring based on image data for gas monitoring captured by the imaging device 2 . However, the moving image storage device according to the present disclosure is applicable not only to moving image data for gas monitoring, but also to a device that stores moving image data for other purposes. The moving image storage device according to the present disclosure is particularly useful when simultaneously storing multiple types of moving image data.

In the above-described embodiment, a power failure was exemplified as an abnormality occurring in the moving image storage device 3, but the present disclosure is not limited to this. For example, when an abnormality other than a power failure occurs that requires the motion picture storage device 3 to stop its operation, an operation stop signal is sent to each part of the motion picture storage device 3 together with stop time information, and a type with a high priority is sent. Image data that can be saved during the stop time may be saved.

INDUSTRIAL APPLICABILITY The present invention is suitable for moving image storage devices that store multiple types of moving image data.

1 gas monitoring system 2 imaging device 21 infrared imaging unit 22 visible light imaging unit 3 moving image storage device 31 control unit 32 display unit 33 operation input unit 34 storage unit 35 processing unit 351 image processing unit 352 storage processing unit 353 determination unit 354 reproduction unit 355 power management section 4 cable

Claims (7)

a storage processing unit that performs storage processing for storing video data in a reproducible state as a video based on image data;
When a predetermined abnormality occurs, among a plurality of types of image data, saving processing is performed during a stop time from when the abnormality occurs to when the saving processing unit becomes unable to perform the saving processing due to the abnormality. a determination unit that determines the type of image data to be subjected to the storage processing based on a predetermined priority, and causes the storage processing unit to perform the storage processing on the determined type of image data;
A video storage device. further comprising an operation input unit for receiving operation input from the user,
The determination unit determines the priority based on the user's operation input to the operation input unit.
The moving picture storage device according to claim 1. a playback unit for playing back the type of image data or video data specified by the user through the operation input unit from among the plurality of types of image data or the plurality of types of stored video data; prepared,
The determination unit measures at least one of a playback time and a number of playback times for each type of the image data or video data played back by the playback unit, and determines the priority based on the measurement result.
The moving picture storage device according to claim 2. The determination unit obtains a storage processing time, which is a time required from the start of the storage processing to the completion thereof, and obtains a storage processing time between the plurality of types of image data based on the storage processing time and the stop time. calculating the number of image data that can be stored in the storage device, and determining the type of image data to be stored during the stop time based on the calculated number and the priority order;
The moving picture storage device according to any one of claims 1 to 3. an imaging device that produces infrared and visible images of a gas monitored area;
A moving image storage device according to any one of claims 1 to 4;
with
The moving image storage device further includes an image processing unit that generates the plurality of types of moving image data for gas monitoring based on the infrared image and the visible image.
Gas monitoring system. A control method for a video storage device that performs storage processing for storing video data in a reproducible state as a video based on image data, comprising:
The control unit
When a predetermined abnormality occurs, among a plurality of types of image data, the saving process is performed during a stop time from when the abnormality occurs until when the moving image saving device becomes unable to perform the saving process due to the abnormality. determining the type of image data to be processed based on a predetermined priority;
A control method for a moving image storage device, comprising: controlling to perform the storage processing on image data of a determined type. A program executed by a computer that performs storage processing for storing video data in a reproducible state as a video based on image data,
on said computer;
When a predetermined abnormality occurs, among a plurality of types of image data, the saving process is performed during the stop time from when the abnormality occurs until the computer becomes unable to perform the saving process due to the abnormality. determining the type of image data to be processed based on a predetermined priority;
causing the storage process to be performed on the determined type of image data;
program.

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