JP4332305B2 - Digital recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital recording apparatus, and more particularly to a technique related to a recording duplication confirmation function during recording or reserved recording.
[0002]
[Prior art]
In recent years, digital recording media such as DVDs and HDDs, which digitize video information, record the digital stream information as digital data, and return the data to the video information again for reproduction, have begun to spread.
[0003]
In such an environment, the capacity of digital recording devices has increased, and a function capable of managing and controlling a large amount of recorded content has become necessary.
[0004]
By the way, conventionally, a user assigns an arbitrary name to each recorded content, and a list of the names is managed so that the user can grasp the contents of the recorded content in the digital recording medium. there were.
[0005]
For example, in the television program recording management apparatus disclosed in Japanese Patent Laid-Open No. 10-326479, program related information (keywords and recording time) is managed for each recorded program, and a recorded program is searched from the history information. A method for preventing duplicate recording of the same program has been proposed.
[0006]
However, in such a system, management is performed with keywords determined by the user, so if easy keywords are added, the contents of recorded programs cannot be grasped later when the number of recorded programs increases, or on the contrary. When a keyword is added, there is a problem that the recorded program content may not be grasped when another user uses it.
[0007]
FIG. 5 is a diagram showing a basic configuration of a conventional digital recording apparatus. The basic operation of the conventional digital recording apparatus will be described with reference to FIG.
[0008]
First, an operation for recording analog video will be described. First, a user performs a recording operation from the operation unit 510. Then, the operation unit 510 instructs the recording / playback control unit 507 to perform recording control. The video referred to here mainly refers to image information, and the content to be recorded includes audio, but in the context of the present invention described below, audio is not particularly important, and the description thereof is omitted. The recording / playback control unit 507 controls the A / D conversion unit 502, the MPEG encoder unit 503, and the HDD unit 504 to record the analog video signal 501.
[0009]
The procedure for recording the analog video signal 501 in the HDD unit 504 is as follows. First, an analog video signal 501 is input to the A / D converter 502 and converted into a digital video signal. The digitized video signal is input to the MPEG encoder unit 503, and the digital video signal is compressed. The compression referred to here is video data compression by the MPEG2 system. The compressed digital video signal is input to the HDD unit 504 and recorded.
[0010]
Next, an operation for reproducing the recorded video will be described. First, a reproduction operation is performed from the operation unit 510 by the user. Then, the operation unit 510 instructs the recording / playback control unit 507 to perform playback control. The recording / playback control unit 507 controls the HDD unit 504, the MPEG decoder unit 505, and the D / A conversion unit 506 to reproduce the video recorded on the HDD unit 504. The reproduced video is presented to the user through the TV monitor unit 512.
[0011]
The procedure for reproducing the video recorded in the HDD unit 504 is as follows. First, the recorded compressed video data is read from the HDD unit 504 and converted into digital video data by the MPEG decoder unit 505. The converted digital video data is converted into an analog video signal by the D / A converter 506 and presented to the user through the TV monitor unit 512.
[0012]
Next, a procedure for searching for a recorded program using the recorded program history information will be described. First, the procedure for storing the recorded program history information will be described. When a recording operation is performed from the repetitive unit 510 by the user, the recording start time information is stored in the recorded program history information storage unit 508, and the recording is performed by the user. Similarly, when the stop operation is performed, the recording end time information is stored in the recorded program history information storage unit 508. Further, when an arbitrary keyword corresponding to the recorded program is set by the user through the operation unit 510, the keyword information is stored in the recorded program history information storage unit 508. In this way, three items of recording start time, recording end time, and keyword are stored as information for searching a recorded program corresponding to the recorded program.
[0013]
Next, a procedure for searching for a corresponding program from stored recorded program history information will be described. A user inputs a recording start time or a recording end time or a keyword of a program to be searched from the operation unit 510. The input status at this time is output to the TV monitor unit 512 through the display unit 511. Based on the input item, the search unit 509 searches the recorded program history information storage unit 508 for the corresponding program. The search result is output to the TV monitor unit 512 through the display unit 511 again.
[0014]
As described above, the recording start time, the recording end time, and the keyword are stored as history information for recording program search, and the same program as the program recorded in the HDD unit 504 is duplicated using this history information. To prevent recording.
[0015]
[Problems to be solved by the invention]
As described above, in the prior art, recording start time / recording end time / keyword are stored as history information of the recorded program, a recorded program is searched from the above history information, and recording of the same program is performed. I was trying to prevent it.
[0016]
However, such a method is inconvenient because the user has to know the keywords of the program recorded, and there is a trouble of searching. In addition, the capacity of recording media has been increasing year by year, and the number of programs that can be recorded has also increased, which makes it difficult to grasp keywords for a large number of programs.
[0017]
In order to solve such a problem, in the present invention, when recording video, image information for detecting duplicate recording is extracted and compared with image information for detecting duplicate recording newly extracted from the video to be recorded. Therefore, it is an object of the present invention to provide an environment capable of automatically detecting duplicate recording and preventing duplicate recording of the same program without burden on the user.
[0018]
[Means for Solving the Problems]
In order to achieve the above object, a digital recording apparatus according to the present invention provides:
When recording a video such as a broadcast program or a video playback video, a duplicate recording detection image extracting means for extracting a scene change image from the video to be recorded as image data for duplicate recording detection;
Image memory means for detection capable of storing at least part of the image data extracted by the image extracting means for detecting duplicate recording;
When a new video is recorded, the duplicate recording detection image data extracted by the duplicate recording detection image extraction means from the newly recorded video and the video already recorded in the past are extracted and used for the detection. A duplicate detection means for determining whether or not a new video has already been recorded by comparing the image data for duplicate recording detection already stored in the image memory means;
If it has already been recorded, a means for notifying duplicate recordings to inform the user to that effect,
Means for canceling the recording of a new image according to the user's operation, or means for automatically canceling the recording of a new video if already recorded.
And configured to prevent duplicate recording of recorded video.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 is a block diagram showing a configuration of a digital recording apparatus according to the first embodiment of the present invention. In FIG. 1, 101 is an input analog video signal, 102 is an A / D converter, 103 is an MPEG encoder, 104 is an HDD, 105 is an MPEG decoder, 106 is a D / A converter, and 107 is a recording. Re-control unit, 108 is a duplicate recording detection image extraction unit, 109 is a scene change detection unit, 110 is an image data extraction unit, 111 is a detection image memory unit, 112 is a duplicate detection unit, 113 is an operation unit, and 114 is a display Reference numeral 115 denotes a TV monitor unit.
[0021]
The duplicate recording detection image extraction unit 108 extracts image data for duplicate recording detection. The scene change detection unit 109 detects a scene change from the digitized video signal, and the image data extraction unit 110 detects a scene change. Image data is extracted. The image data extracted by the duplicate recording detection image extraction unit 108 is output to the detection image memory unit 111 and the duplicate detection unit 112. The duplicate detection unit 112 compares the image data output from the duplicate recording detection image extraction unit 108 with the image data read from the detection image memory unit 111 to determine whether the images are the same.
[0022]
Next, the operation of this embodiment will be described. First, an operation for recording analog video will be described. First, a recording operation is performed from the operation unit 113 by the user. Then, the operation unit 113 instructs the recording / playback control unit 107 to perform recording control. The video referred to here mainly refers to image information, and the content to be recorded includes audio, but the audio is not particularly important in the context of the present invention, and the description thereof is omitted. The recording / playback control unit 107 controls the A / D conversion unit 102, the MPEG encoder unit 103, and the HDD unit 104 to record the analog video signal 101.
[0023]
The procedure for recording the analog video signal 101 in the HDD unit 104 is as follows. First, the analog video signal 101 is input to the A / D conversion unit 102 and converted into a digital video signal. The digitized video signal is input to the MPEG encoder 103, and the digital video signal is compressed. The compression referred to here is video data compression by the MPEG2 system. The compressed digital video signal is input to the HDD unit 104 and recorded.
[0024]
Next, an operation for reproducing the recorded video will be described. First, a reproduction operation is performed from the operation unit 113 by the user. Then, the operation unit 113 instructs the recording / playback control unit 107 to perform playback control. The recording / playback control unit 107 controls the HDD unit 104, the MPEG decoder unit 105, and the D / A conversion unit 106 to reproduce the video recorded on the HDD unit 104. The reproduced video is presented to the user through the TV monitor unit 115.
[0025]
The procedure for reproducing the video recorded in the HDD unit 104 is as follows. First, the compressed video data recorded from the HDD unit 104 is read and converted into digital video data by the MPEG decoder unit 105. The converted digital video data is converted into an analog video signal by the D / A conversion unit 106 and presented to the user through the TV monitor unit 115.
[0026]
The above is the normal analog video recording / playback procedure.
[0027]
Next, an image extraction procedure for detecting duplicate recording will be described. The video signal digitized by the A / D conversion unit 102 is transferred to the duplicate recording detection image extraction unit 108, and a detection image is extracted. First, the scene change detection unit 109 detects a scene change, and the image data extraction unit 110 extracts one frame image data at the time of the scene change, thereby obtaining image data for detecting duplicate recording.
[0028]
As the above-mentioned scene change detection method, a scene change is detected by extracting a feature amount from difference data between adjacent frames of the input video and detecting a change in the feature amount.
[0029]
As described above, the image data extracted for duplicate recording detection is recorded in the detection image memory unit 111. Although it is image data to be recorded in the memory unit 111, when all scene change images are captured during video recording, the amount of data becomes enormous. Therefore, there is a restriction such as only 10 frame images after 10 minutes have elapsed since the start of recording. Keep it. In this way, 10 frames of detected images are recorded per program.
[0030]
Next, a procedure for detecting duplicate recording will be described. When recording an analog video signal, the duplicate recording detection image extraction unit 108 extracts the detection image as described above and passes it to the duplication detection unit 112. At this time, the detection image data extracted from the recorded video also from the detection image memory unit 111 (the first frame of the image data extracted by 10 frames per program) is passed to the duplication detection unit 112, and the same image It is determined whether or not. In this determination, the determination is performed with a certain degree of tolerance so that the determination result is not affected by noise, level fluctuation of the analog video signal, or the like.
[0031]
As a result of the determination, if it is determined that the images are the same, the duplication detection unit 112 requests image data for the next detection image for one frame from the detection image memory unit 111 and updates the detection image. Go. If all 10 frames of the duplicate recording detection image match, it is determined that the recording is duplicated, and the display unit 114 performs display processing of the duplicate recording warning display screen, and the duplicate recording warning display screen is displayed to the user through the TV monitor unit 115. Presented.
[0032]
An example of the screen displayed at this time is shown in FIG. As shown in FIG. 2, when it is determined that the recording is duplicated, the recording / playback control unit is prompted by the user through the operation unit 113 to cancel or continue the recording and select one of the operations. In step 107, the recording is stopped or the recording is continued. When the recording stop control is performed, the recording content until the middle of the new video is deleted from the HDD unit 104, and the image data for detecting duplicate recording extracted from the new video is also deleted from the detection image memory unit 111. Is done.
[0033]
When the duplication detection unit 112 determines that the recording is duplicated, the recording / playback control unit 107 is automatically controlled to automatically execute the recording stop process, and the recording content up to the middle of a new video is stored in the HDD unit 104. In addition, the image data for detecting duplicate recording extracted from a new video may be deleted from the detection image memory unit 111.
[0034]
In addition to the text display as described above, the means for notifying the user that the recording is duplicate recording may be a means for notifying that the recording is overlapping by using the voice output generated by the voice synthesizing means. Good.
[0035]
In the present embodiment, it is possible to automatically detect that the recording is overlapped by the above-described configuration and control method, thereby preventing the overlapping recording.
[0036]
Next, a second embodiment of the present invention will be described. FIG. 3 is a block diagram showing a main configuration of a digital recording apparatus according to the second embodiment of the present invention. This embodiment is different from the first embodiment only in the procedure for fetching the image data for detecting duplicate recording into the detection image memory unit 111. Therefore, in FIG. 3, only the main part different from FIG. 1 is mainly blocked. It is shown.
[0037]
In FIG. 3, 301 is an image memory unit for user selection, and 302 is an image selection control unit. In FIG. 3, the same components as those shown in FIG. 1 are denoted by the same reference numerals.
[0038]
A procedure for storing image data for detecting duplicate recording in the detection image memory unit 111 according to the present embodiment will be described.
[0039]
First, the analog video signal 101 is converted into a digital video signal by the A / D converter 102. The digitized video signal is passed to the duplicate recording detection image extraction unit 108, and the image data is extracted by extracting the image data at the time of the scene change, as in the first embodiment. All of the extracted image data is temporarily stored in the user selection image memory unit 301.
[0040]
After the recording is completed, a list of image data read from the image memory unit 301 for user selection by the image selection control unit 302 is displayed on the TV monitor unit 115 through the display unit 114 so that the user can select image data for detecting duplicate recording. Is displayed.
[0041]
FIG. 4 is a diagram showing an example of a list display screen of image data read from the user selection image memory unit 301. Each image data is displayed as a thumbnail image, and a page scroll instruction is given from the operation unit 113 to the display unit 114. Thus, the list display screen is scrolled and displayed. In such a list display screen using thumbnail images, the user can select / determine by selecting / determining image data by the user using the operation unit 113 (for example, by moving the cursor using the cursor key and pushing the enter key). The image selection control unit 302 is instructed to import the image data into the detection image memory unit 111. As a result, the image selection control unit 302 stores the image data selected and determined by the user in the detection image memory unit 111 as information for detecting the number of scene changes as an image for detecting duplicate recording.
[0042]
According to the procedure as described above, in this embodiment, the user can select image data for detecting duplicate recording.
[0043]
The method for detecting duplicate recording is substantially the same as in the first embodiment, and the duplicate detection unit 112 (not shown in FIG. 3) detects the image data extracted by the duplicate recording detection image extraction unit 108 and the detection data. This is performed by comparing the image data for detecting duplicate recording stored in the image memory unit 111. That is, every time image data having the same scene change number as the scene change number of the image data stored in the detection image memory unit 111 arrives at the duplication detection unit 112 from the duplicate recording detection image extraction unit 108, the duplication detection unit The image data output from the duplicate recording detection image extraction unit 108 and the image data of the corresponding scene change number read from the detection image memory unit 111 are compared and stored in the detection image memory unit 111. If all the image data matches, it is determined that the recording is duplicated.
[0044]
Also in the present embodiment, as in the first embodiment, it is possible to automatically detect that it is a duplicate recording, thereby preventing the duplicate recording. Furthermore, since the user selects an image for detecting duplicate recording, it is possible to efficiently select an image suitable for detecting duplicate recording, and to improve the detection accuracy of duplicate recording.
[0045]
【The invention's effect】
As described above, according to the present invention, it is possible to prevent duplicate recording of the same video without the user being aware of the recorded video content, and to prevent wasteful consumption of the recording capacity of the digital recording device. .
[0046]
Furthermore, by allowing the user to select an image for detecting duplicate recording, it is possible to efficiently select an image suitable for detecting duplicate recording, and to improve the accuracy of detecting duplicate recording.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a digital recording apparatus according to a first embodiment of the present invention.
FIG. 2 is an explanatory diagram showing an example of a duplicate recording warning display screen in the digital recording apparatus according to the first embodiment of the present invention.
FIG. 3 is a block diagram showing a main configuration of a digital recording apparatus according to a second embodiment of the present invention.
FIG. 4 is an explanatory diagram showing an example of an image data list display screen for prompting a user to select image data for detecting duplicate recording in the digital recording device according to the second embodiment of the present invention.
FIG. 5 is a block diagram showing a configuration of a digital recording apparatus according to the prior art.
[Explanation of symbols]
101 Analog video signal 102 A / D conversion unit 103 MPEG encoder unit 104 HDD unit 105 MPEG decoder unit 106 D / A conversion unit 107 Recording / playback control unit 108 Duplicate recording detection image extraction unit 109 Scene change detection unit 110 Image data extraction unit 111 Image memory unit for detection 112 Duplicate detection unit 113 Operation unit 114 Display unit 115 TV monitor unit 301 Image memory unit for user selection 302 Image selection control unit

Claims (4)

When recording a video such as a broadcast program or a video playback video, a duplicate recording detection image extracting means for extracting a scene change image from the video to be recorded as image data for duplicate recording detection;
Image memory means for detection capable of storing at least part of the image data extracted by the image extracting means for detecting duplicate recording;
When a new video is recorded, the duplicate recording detection image data extracted by the duplicate recording detection image extraction means from the newly recorded video and the video already recorded in the past are extracted and used for the detection. A duplicate detection means for determining whether or not a new video has already been recorded by comparing the image data for duplicate recording detection already stored in the image memory means;
If it has already been recorded, a means for notifying duplicate recordings to inform the user to that effect,
Means for canceling the recording of a new video in response to a user operation,
A digital recording apparatus characterized in that duplication of recorded video can be prevented. When recording a video such as a broadcast program or a video playback video, a duplicate recording detection image extracting means for extracting a scene change image from the video to be recorded as image data for duplicate recording detection;
Image memory means for detection capable of storing at least part of the image data extracted by the image extracting means for detecting duplicate recording;
When a new video is recorded, the duplicate recording detection image data extracted by the duplicate recording detection image extraction means from the newly recorded video and the video already recorded in the past are extracted and used for the detection. A duplicate detection means for determining whether or not a new video has already been recorded by comparing the image data for duplicate recording detection already stored in the image memory means;
If it has already been recorded, a means for notifying duplicate recordings to inform the user to that effect,
If it has already been recorded, a means for automatically canceling the recording of a new video,
A digital recording apparatus characterized in that duplication of recorded video can be prevented. In Claim 1 or 2,
A digital recording apparatus characterized by comprising means for a user to arbitrarily select image data for detecting duplicate recording from the recorded video. In Claim 1 or 2,
The digital recording apparatus characterized in that the duplicate recording notification means displays text on the display unit of the apparatus or outputs by voice that it is a duplicate recording.

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