KR100586151B1 - Method to delete parts of video data stored in hard disk drive of a digital video recorder - Google Patents

Abstract

The present invention relates to a method of partially deleting video data in a digital video recorder.

The present invention provides a method for processing a digital video image to be played so that a start point and an end point of a portion to be deleted can be specified, and the start point and the start point in a GOP unit are corrected in a group of pictures (GOP) unit. And setting an end point, and deleting digital image data located between the start point and the end point in the GOP unit in units of clusters on the hard disk drive.

According to the present invention, the video data to be deleted is only deleted in a cluster unit of the hard disk drive, and the entire video data is not regenerated and stored in the hard disk drive as in the related art. As a result, the partial deletion process of the video data stored in the hard disk drive can be performed very quickly.

Digital video recorder, hard disk drive, partial delete, GOP

Description

Method to delete parts of video data stored in hard disk drive of a digital video recorder}

1 is an overview of a digital video recorder system,

2 is an overview for explaining a conventional partial deletion method;

3 is a flowchart of a preferred embodiment of the present invention;

4 is a process of determining a portion to be deleted according to the present invention;

5 shows a data structure in a state of partial deletion.

* Explanation of symbols for main parts of the drawings

1: digital video recorder 2: remote control

3: TV

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of partially deleting video data in a digital video recorder. In particular, the present invention relates to a digital video recorder configured to record and play back video data on a hard disk drive (HDD). It's about how to make that happen.

Unlike conventional video cassette recorders (VCRs) that store video signals in an analog manner on magnetic tape, digital video such as a personal video recorder (PVR) that stores digital video data in a hard disk drive (HDD). Recorders are being developed. The digital video recorder is a next-generation recording device that has a built-in hard disk drive in the set-top box or television body to record a predetermined amount of broadcast programs according to the capacity of the hard disk drive.

Referring to FIG. 1, the digital video recorder 1 is configured to record information on a hard disk drive, and is controlled through various keys provided in the remote controller 2 or the digital video recorder itself. The video data stored in the hard disk drive is reproduced in the same manner as the file reproduction method used in the personal computer (PC) and output through the television 3. These digital video recorders are not much different from traditional video cassette recorders (VCRs) in their basic function of storing programs exported from stations and watching them again at a convenient time, but they use hard disk drives to find and edit the desired parts. It is easy.

On the other hand, the digital video recorder can receive the latest broadcast schedule connected to the telephone line from time to time and utilize it for scheduled recording. The scheduled recording procedure is simple enough to select a broadcast list on the screen.

However, the program recorded in this way may contain parts that the user does not want (eg advertisements). Therefore, the user deletes unnecessary parts from the broadcast programs that he or she selects and saves on the hard disk drive. To manage.

In accordance with such a need, the patent application 10-2003-0003515 filed on January 18, 2003 and published on July 27, 2004, entitled "Image recording / playback apparatus having a partial deletion function and its partial deletion method" When the beginning and end of the video are selected, a method of deleting video data between the beginning and the end is disclosed.

Referring to FIG. 2, the partial deletion method performed through this method will include a GOP (Group Of Pictures) whose original file name is '000000001.mpg' stored in the hard disk drive and its file structure is 0-33. Assume that the data is composed of (a), (5,7), (12,13), (18,21), (27,) for the entire GOP data (0 to 33) of the video file '000000001.mpg'. If the user has selected to partially delete the GOP data of (28) (b), a new video file (000000002.mpg) with partial deletion is completed is created in memory (c), and this new video file ( 000000002.mpg) is stored back on the hard disk drive.

However, using this technique, although a certain portion of a video can be deleted, the entire video with the selected portion deleted is created once in memory, and the video is stored again on the hard disk drive. That is, since the partial deletion processing is indirectly performed, there is a problem in that it takes more time.

Accordingly, the present invention has been proposed to solve the above problems, and provides a method of allowing partial deletion editing to be performed quickly by performing partial deletion of video data directly on a cluster unit of a hard disk drive. There is this.

In order to achieve the above object, in the digital video recorder according to the present invention, the method for deleting a portion of video data comprises the steps of: allowing the user to specify a start point and an end point of a portion to be deleted with respect to the digital video image to be played back. ; Correcting the designated start point and end point in a group of pictures (GOP) unit to set a start point and an end point in a GOP unit; And deleting the digital image data located between the start point and the end point in the GOP unit in cluster units in the hard disk drive.

The start time in the GOP unit may be preferably set to the start data of the GOP unit first appearing after the data of the GOP unit corresponding to the start time designated by the user.

The end point in the GOP unit may be preferably set to the data immediately before the GOP unit start data first appearing before the GOP unit data corresponding to the end point designated by the user.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 illustrates an embodiment of a process of partial deletion of video data according to the present invention.

When the user inputs a signal to play a video by operating a key provided in the remote controller or the digital video recorder itself (S30-1), the digital video recorder starts to play the corresponding video stored in the hard disk drive (S30- 2).

On the other hand, when the user starts an unnecessary video image such as an advertisement while watching a television screen, the user operates the remote controller to designate the start point of deleting the video data (S30-3). The digital video recorder memorizes the information on this starting point and continues to play the video (S30-4). In addition, when the unnecessary video image is ended, the user operates the remote controller to designate the end point of deleting video data (S30-5). The designation of the start time made in step S30-3 and the designation of the end time made in step S30-5 are performed by the user while watching a television screen, which is performed on a time basis as in the example shown in FIG. 4A.

In operation S30-3 and operation S30-5, a user interface that allows a user to designate a start point and an end point may be formed in various forms for convenience of use. As an example, if the user specifies the start point in step S30-3, the digital video recorder will be in a still image state once, allowing the user to slowly search for the video image before and after the start point to specify the correct point in time. Can be. This example can be similarly applied to the designation of the end point. That is, when the video image is played at the normal speed, it may not be easy for the user to accurately specify the start point or the end point of an unnecessary commercial, thereby enabling the user to specify the correct position through the low speed search.

In step S30-3 and S30-5, the user who designates the start point and the end point instructs the user to perform partial deletion by operating the remote controller (S30-6).

Then, the digital video recorder corrects the starting time point T1 designated by the user on a time basis in the GOP (Group Of Pictures) unit as shown in FIG. 4B to set the starting point F2 in the GOP unit (S30-). 7).

That is, the start point T1 designated by the user in the time domain corresponds to the position of F1 when viewed in the GOP unit, and the position is corrected to the position of F2 where the data of the GOP unit can be maintained in a normal state. At this time, if the calibrated starting point in the GOP unit is configured to be set to the starting data position (F2) of the GOP unit first appearing after the position F1 of the GOP unit data corresponding to the starting point T1 specified by the user. It can implement preferably.

Further, the digital video recorder corrects the end point T2 designated by the user on a time basis in GOP (Group Of Pictures) units to set the end point F4 in the GOP unit (S30-8).

That is, the end point T2 designated by the user in the time domain corresponds to the position of F3 when viewed in the GOP unit, and the position is corrected to the position of F4 where the data of the GOP unit can be maintained in a normal state. At this time, the calibrated end point in the GOP unit is set to the data position F4 immediately before the GOP unit start data first appearing before the position F3 of the GOP unit data corresponding to the end point T2 specified by the user. If comprised, it can implement suitably.

When the start point and the end point in the GOP unit are set through the steps S30-7 and S30-8, the digital video recorder is a digital image located between the start point and the end point of the GOP unit as shown in FIG. 4C. Data is deleted from the hard disk drive in cluster units (S30-9). As a result, the part is deleted from the hard disk drive.

As described above, as an example, the state of video data stored in the hard disk drive when the partial deletion is performed according to the present invention will be described as an example.

The hard disk drive records video data in the form of a file, and each video has an index that records the time at which the video data is executed, the cluster position of the hard disk drive where the video data is stored, and information about the composition of the GOP data. A file and a stream file having actual video data in units of GOPs. Here, the index file means a file having various information necessary for reproducing a stream file having actual video image data regardless of its name.

In this case, when a portion of video data is deleted from the hard disk drive, the content of the index file constituting the video may be changed so that only a portion of the video data from which the portion is deleted may be processed. For example, if a stream file contains video data consisting of images 1 to 20 in the time domain, and images 8 to 10 are deleted from the hard disk drive through the partial deletion method according to the present invention, the index file is image 1 The image file may be reconfigured into an index file displaying images 7 and an index file displaying images 11 through 20.

Referring to FIG. 5, the state of a hard disk drive is compared between partial deletion according to the prior art and partial deletion according to the present invention.

Assuming that video data consisting of images 1 to 20 is stored in the hard disk drive, and that portions of images 8 to 10 are to be deleted (5a), when the partial deletion is performed according to the prior art, images 8 to 20 The portion of 10 is deleted and newly created video data consisting of images 1 to 7 and images 11 to 20 are newly generated and stored on the hard disk drive again (5b). However, in the case of partial deletion in accordance with the present invention, only the parts of the video 8 to the video 10 are deleted in the cluster unit, and the original video data remains intact on the hard disk drive (5c).

At this time, the size of the index file as described above is very small compared to the stream file, so even if the index file is changed, partial deletion is much faster than the conventional method of newly generating the stream file itself and storing it back on the hard disk drive. You can run

The present invention is not limited to the above-described embodiments and can be variously modified and implemented by those skilled in the art without departing from the technical spirit of the present invention.

According to the present invention, the video data to be deleted is only deleted in a cluster unit of the hard disk drive, and the entire video data is not regenerated and stored in the hard disk drive as in the related art. As a result, the partial deletion process of the video data stored in the hard disk drive can be performed very quickly.

Claims (3)

In the method of partially erasing video data stored in the hard disk drive of the digital video recorder, Processing a user to designate a start point and an end point of a portion to be deleted for the digital video image to be played back; Correcting the designated start point and end point in a group of pictures (GOP) unit to set a start point and an end point in a GOP unit; And And deleting the digital image data located between the start point and the end point in the GOP unit in cluster units in the hard disk drive. The method of claim 1, And a start point of the GOP unit is set to start data of the GOP unit first appearing after the data of the GOP unit corresponding to the start point designated by the user. The method of claim 1, In the digital video recorder, an end point of the GOP unit is set to be immediately before the GOP unit start data first appearing before the data of the GOP unit corresponding to the end point designated by the user. Way.

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