KR100950011B1 - System for managementing video data and method thereof - Google Patents

Abstract

The present invention relates to a system and method for managing recorded video information on a digital video recorder (DVR), and more particularly, to generate a file name including information on an image file and to index the file based on the file name. A system and method for generating a file to manage an image. According to the present invention, all information (recording time information, event information, etc.) of an image is recorded in a file name, and thus, when the index file is damaged, the index file can be restored only by the file name without opening the file.

Filename, index file, recovery

Description

System for managementing video data and method

The present invention relates to a system and method for managing recorded video information on a digital video recorder (DVR), and more particularly, to generate a file name including information on an image file and to index the file based on the file name. A system and method for generating a file to manage an image.

The existing analog video cassette recorder (VCR) can record up to 3 hours and 30 minutes when recording NTSC (TV standard used in Korea and USA) on one video tape. If you increase the recording time by dropping, you can record up to 10 hours and 30 minutes. Since the amount of images that can be recorded on the videotape is extremely small, the videotape must be replaced at any time, and there is no method for recording the image information generated during the replacement.

In addition, as described above, in order to prevent image information lost due to replacement, data is recorded in such a manner as to repeatedly record one video tape and overwrite the image file collected later on the previous image file. Due to the frequent reading and writing of the tape, the magnetic particles of the tape are continuously lost, resulting in a phenomenon that the image quality is degraded so that the image cannot be recognized later.

With the recent development of digital image processing technology, a digital video recorder (hereinafter referred to as a DVR) that replaces the video cassette recorder and digitally processes an image obtained from a camera and stores it on a hard disk (HDD) or a digital video disk (DVD) Will appear.

The DVR processes the acquired analog video information into digital video information. At this time, various video codecs can be used to compress and store the video information in a very small amount without losing the information as much as possible. Was achieved.

In order to store the recorded video, the DVR divides the hard disk into several areas such as a header area and a video area, and then records them in block units on the hard disk, or records the video information in a file using a Linux-based operating system. Indexing is also possible by recording information about files in a separate file. The header or index information contains the recording start time of the video and the information of the corresponding time. In addition, the header or index information contains information for distinguishing whether the event video is generated through motion detection, the event video detected by the sensor, or the basic video recording. .

Additional information about these videos is useful for DVR users to search, play back or backup videos at specific times. However, in managing the video information of DVR, the method of recording by block unit of hard disk or creating a separate index file for indexing on file basis and recording the video information in the index file causes loss of header or index information. This can cause serious problems.

As described above, in the case of the block-type recording method of the conventional digital video recorder, information about the start position and the end position of the block in which the image is recorded is recorded in the header area. In this case, the header information is damaged due to abnormal operation of the system. Or incorrect information may be recorded.

At this time, if the information on the block in which the image is recorded cannot be obtained correctly due to the wrong information, the image can no longer be accessed even though the image information on the hard disk is not damaged.

Likewise, if information about the image is recorded in the index file, the file may be broken or damaged when the system is abnormally operated due to frequent reading and writing of the index file.

In this case, in order to recover the damaged information, it is necessary to obtain the video information through the file. In order to do this, it is necessary to open all the video files and collect the video information. There is a drawback that, among other things, recording gaps occur while restoring video files.

Accordingly, the present invention uses a file name for the image information obtained and an index file indexed to the file name, and even if the index file is damaged, the index file is quickly recovered by the file name without opening the file, thereby stably managing the image. Suggest a system and method that can be.

In order to achieve the above object, an image management system according to the present invention includes an input / output unit for exchanging event signals with an external hardware device such as a camera and a sensor, and an image for processing the camera signal provided from the input / output unit to generate an image. A processing unit, a timer for detecting a time according to an event occurrence, a memory unit for storing an image processed by the image processing unit, a file name and an index file according to the image, a time signal of the event signal, an image signal, and the timer unit And a control unit for generating the record information according to the video generation process as the file name, and generating the index file by indexing the file name.

In this case, the recording information may include at least one of a file creation time, an event presence identifier, and a codec type of an image.

The control unit may include a file name generation unit that generates a file name based on the record information, and an index file generation unit that generates an index file including an indexed file list based on the file name.

On the other hand, the controller generates a file name by matching the divided image when the image is divided by a predetermined unit of time, and adds information about the divided start point and end point for each file name, or when dividing the image by a predetermined capacity The file name may be generated by matching the image, and information about the length of the image may be added to each file name.

The controller may generate an indexed index file by adding the recognition name of the removable memory device to the file name when connected to the removable memory device, and recognizes the recognition name included in the index file and the removable memory device. If the names do not match, the index file may be restored by adding the recognition name of the removable memory device based on the file name.

On the other hand, the image management method according to the present invention for achieving the above object is the generation time of the file generated in the process of acquiring the image from the external hardware device, the event discriminator according to the operation of the external hardware device and the codec type of the image A first step of generating record information including at least one of the information about the file name, a second step of generating an index file based on the file name, and a third step of storing the file name and the index file. .

In addition, when the image is divided in the first unit of time in the first step, a file name is generated by matching the divided image, information about the start point and the end point of the image is added to the file name, or the image is divided into the predetermined capacity. The method may further include generating a file name by matching the divided image and adding information on the length of the image to the file name.

In addition, if there is no file name matched based on the index file, the method may further include a fourth step of recovering the index file based on the file name.

The method may further include generating an indexed index file by adding the recognition name of the removable memory device to the file name when the image file corresponding to the file name is stored in the removable memory device. In this case, when the recognition name of the removable memory device is changed, a fifth step of generating or restoring an index file based on a file name stored in the removable memory device may be included.

In the present invention, by using the file name of the recorded video and the index file using the same, the index file is prevented from being damaged and the file cannot be recovered. That is, by recording all the information (image recording time information, event information, etc.) of the image in the file name, if the index file is damaged, the index file can be recovered using only the file name without opening the file.

In addition, the present invention can easily overcome the situation that there is a video that can be generated from the existing DVR but the search or backup is not possible through the management of the recorded video file using the file name. This increases the reliability of the DVR, a security solution, and makes it a more competitive product.

In addition, the present invention can record various additional information not described in the present invention because the recording of information through the file name can be extended to 255 characters, which is the limit of the file name.

In addition, the present invention can be overcome by recovering the index file through the file name stored in the hard disk even in a system using a large amount of hard disk even when the access to the image file is impossible due to the damage of the index file It can be effective.

The image management system and method according to the present invention as described above will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a system for image management according to the present invention, which comprises an input / output unit 101 for exchanging event signals with an external hardware device such as a camera and a sensor, and processing image signals provided from the input / output unit. A video processor 102, a timer 103 for detecting time according to an event occurrence, a file name based on the event signal, a video signal, and a time signal, and an index file by indexing the file name based on the file name. It is composed of a control unit 104 for generating a.

In this case, the controller may include a file name generation unit 105 for generating a file name according to a predetermined file name creation flow of the event signal, a video signal, and a time signal, and an index file including a file list indexed based on the file name. The index file generating unit 106 may be configured to generate the index file.

In addition, the file name and the index file generated by the control unit may be stored in the memory unit 107. If the index file is broken or damaged, the damaged file is generated based on the file name stored in the memory unit 107. Can be recovered by replacing

In addition, the controller 104 controls the image processor 102 to store an image file corresponding to the sector in which the file name is generated, and stores the image file corresponding to the file name, so that the controller 104 receives an event signal. The video file may be discontinuously matched with the file name depending on whether the external hardware device is generated and the event signal is generated according to the detection of the external hardware device or the satisfaction of a predetermined condition.

In this case, the control unit 104 may receive a time signal according to the event signal generation from the timer unit 103, and the control unit 104 transmits a signal at a predetermined time interval. The controller may generate an event signal by controlling the external hardware device to store an image file and generate a file name and an index file according to the event signal.

Meanwhile, as shown in FIG. 2, the controller designates a predetermined sector for generating a file name and storing the file in the memory unit, and controls the image processor to sequentially sequence an image file matching the sector in which the file name is stored. Can be stored.

The controller may generate an index file based on the file name and store the index file in the memory unit, wherein the index file is an indexed file based on recording information of an image provided by the file name.

The reason why the file name can be indexed based on the file name as described above is that as shown in FIG. 3, the file name displays various record information generated in the process of generating the image file. As specified below, the controller may generate a file name according to a predetermined format. For example, the controller may easily generate an index file based on the file name including the record information as follows.

                 Record Information          Separator 1. Creation time of file (recording start time of image) Year, month, date, hour, second (14 digits)  2. Whether the event A. Motion Detection Image M B. Sensor Detection Image S C. Basic Recorded Video N D. Separator according to other events Event delimiter  3. Codec type of video A. MPEG-4 MPG B. M-JPEG MJPG C. H.264 H264 D. Abbreviation for other codecs. Abbreviation for codec

Referring to the file name generated according to the above format with reference to the drawing shown in FIG. 3, if the general video was recorded at 10 am on April 1, 2008, and the codec used MPEG-4, "20080401100000N.MPG It will have a name like " That is, "20080401100000" of the recording information means the time of the recorded video.

Thereafter, “N”, which is an event type of the record information, may be added to indicate that the recorded video is a normal recorded video. In addition, the control unit may receive the recording information on the type of codec used in the image processor and generate the file information by adding the codec abbreviation to the file name as described above.

The controller may control the image processor to generate an image file by dividing an image by a predetermined time unit, and generate a file name for the image file so that the end point of the image may be determined using only recording start time information. If you want to display the start time as well as the end time, you can use the method of creating a new file for each file size of a certain size rather than a predetermined time unit.

For example, the file name is created as "200803011100000 200803011110000N .MPG" and records the end point as the underlined part as well as the start point, or the image with the start point as the underlined part of the file name "20080311100000 3600 N.MPG". Can be expressed in seconds or minutes.

The file name generated as described above is stored in the image storage directory of the memory unit, and the controller can generate the index file in a file list format as needed using the file name as described above.

4 is a flowchart of a video management method according to an embodiment of the present invention, in which an event delimiter in the above-described format is used to distinguish an event caused by an external hardware device or the controller in the middle of a normal recording mode of an external hardware device. May be written in the file name, and the start time at which the corresponding event occurs may be additionally written. The codec type of the image processed by the image processor may be grasped and written in the file name.

Afterwards, when the event ends, close the file and save the file by matching the file name with the image file. At this time, if necessary, the end time may be additionally written in the file name as described above, so that the relationship between the files may be clearly distinguished.

On the other hand, in order to easily manage the record information for the event image, it is possible to easily manage the file through the index file by classifying the event image in units of frame intervals.

For example, if the event video exceeds the preset time from the time of recording, close the file and write the length of the video in the file name according to the end time or capacity as described above to clearly identify the time when the file is closed. The file name may be generated by changing the start time of the file name generated from the closed time point, and matching the file name with the image file after the closed time point so that the frame may be cut and stored in units of a predetermined period.

By doing so, an index file is generated based on the file name, and an image file generated sequentially for one event image is easily divided based on the index file so that easy management can be performed for one image. can do.

On the other hand, in the case of the normal recorded video, as in the event video, the separator for the normal recorded video is written in the file name, and if necessary, the file name is generated by cutting in units of frames in the same manner as the event video, and the video file corresponding to the file name is matched. Simultaneously, the index file is generated based on the file name, and the classification of the frame section can be performed through the index file, thereby facilitating image management.

On the other hand, in general, multiple hard disks are used to record a video for a long time in the DVR. When a plurality of hard disks are used, the recorded video is recorded on a hard disk with free space, so a specific time is detected during video search. It is necessary to indicate on which hard disk the video recorded in the file exists.

If the information of the hard disk is reflected in the file name, it can be expressed as "20080401100000NA.MPG". However, due to the characteristics of the DVR, the hard disk can be replaced. You will have possession of.

For example, when a hard disk that was "SDA" is disconnected and then reconnected, it may be "SDB" rather than "SDA". File management on the "SDB" hard disk still points to "SDA", making file management difficult. Therefore, in order to eliminate the confusion, the file name is not displayed on the hard disk information. When the index file is created, the hard disk information is added to the file name.

The above-described bar will be described in detail with reference to FIG. 5. As shown in FIG. 5A, a file name "20080402040000N.MPG" generated for an initial recorded video is stored in an SDA hard disk, and based on the file name, "20080402040000NA." Create an index file including the file name including the hard disk information, such as "MPG."

Subsequently, the SDA hard disk is disconnected and then connected again. The control unit recognizes the hard disk SDA as a hard disk SDB and searches for an existing SDA hard disk as a changed hard disk SDB based on the index file. Accordingly, the controller cannot recognize the matching file name by comparing the file list stored in the index file with the file name "20080402040000NA.MPG".

At this time, the controller can easily determine that the hard disk is changed or the index file is damaged, and the file list of the index file is based on the file name currently stored in the recognized hard disk SDB as shown in FIG. By regenerating, the image file corresponding to the index file can be accessed.

As such, by creating an index file including a list of files generated by adding hard disk information to a file name stored in the hard disk, the index file is damaged or identical in the system to a plurality of files generated in a plurality of hard disks. It is possible to prevent the case where the image file generated in the different recognition process of the hard disk cannot be accessed.

And if the name of the file which has the most important meaning in the present invention is lost, there is a possibility that all these recovery processes are invalidated. If the inode table is broken due to a problem of the operating system, the file name information cannot be obtained and thus the information about the image cannot be obtained. So to avoid losing the file name, you can write the file name at the top of the file to recover the file name if the inode table is broken and cannot be read.

1 is a block diagram of an image management system according to the present invention.

2 is an exemplary view showing a memory structure of an image management system according to the present invention.

Figure 3 is an illustration of the file name generation of the image management system according to the present invention.

4 is a flowchart of an image management method according to the present invention;

5 is a view showing an embodiment according to the change of the removable memory device of the image management method according to the present invention.

*** Description of the symbols for the main parts of the drawings ***

101: input and output unit 102: image processing unit

103: timer unit 104: control unit

105: file name generation unit 106: index file generation unit

107: memory section

Claims (13)

An input / output unit for exchanging event signals with external hardware devices such as cameras and sensors; An image processor which generates an image by processing a camera signal provided from the input / output unit; A timer unit for detecting a time according to an event occurrence; A memory unit for storing an image processed by the image processor and a file name and an index file according to the image; On the basis of the event signal, the video signal, and the time signal of the timer unit, recording information according to an image generation process is generated as the file name, the file name is indexed to generate the index file, and when connected to the removable memory device. A control unit for generating the indexed index file by adding a recognition name of the removable memory device to a file name Image management system composed of. The method according to claim 1, A file name generation unit generating a file name based on the record information; Index file generation unit for generating an index file including a list of files indexed based on the file name Image management system, characterized in that consisting of. The method according to claim 1, The recording information includes at least one of a file creation time, an event presence identifier, and a codec type of an image. The method according to claim 1, The control unit generates a file name by matching the divided image when the image is divided by a predetermined time unit, and adds information about the divided start point and end point for each file name. The method according to claim 1, The control unit generates a file name by matching the divided image when the image is divided into a predetermined capacity, and adds information on the length of the image for each file name. delete The method according to claim 1, And the control unit restores the index file by adding the recognition name of the removable memory device based on the file name when the recognition name included in the index file and the recognition name of the removable memory device do not match. Generating record information including a file name including at least one of a generation time of a file generated in the process of acquiring an image from an external hardware device, an event discriminator according to an operation of the external hardware device, and information on a codec type of the image; Step 1; Generating an index file based on the file name, and generating the indexed index file by adding a recognition name of the removable memory device to the file name when storing an image file corresponding to the file name in the removable memory device; Steps; A third step of storing the file name and the index file Image management method consisting of. The method according to claim 8, In the first step, when the image is divided by a predetermined time unit, generating a file name by matching the divided image, and further comprising the step of adding information about the start and end point of the image to the file name; Way. The method according to claim 8, The method of claim 1, further comprising: generating a file name by matching the divided image and adding information about the length of the image to the file name when the image is divided into a predetermined capacity. The method according to claim 8, And if there is no matching file name based on the index file, recovering the index file based on the file name. delete The method according to claim 8, And a fifth step of creating or restoring an index file based on a file name stored in the removable memory device when the recognition name of the removable memory device is changed.

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