JP2010130394A - Recording apparatus and recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control not to waste capacity of a recording medium while recording a scene desired to watch by a user with high image quality. <P>SOLUTION: A recording apparatus is configured to comprise: a receiving means for receiving broadcast data including program data including video data and program associated information associated with the program; a separating means for separating the broadcast data received by the receiving means; a data conversion processing means for changing a data rate of the video data included in the program data; a recording means for recording data; and a control means for analyzing a degree of importance of a scene while using the program associated information, and controlling the data conversion processing means so as to change the data rate of the video data in accordance with the degree of importance of the scene. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The technical field relates to an apparatus for recording and reproducing video and audio data.

Regarding the above technical field, Patent Document 1 states “By genre information shown in the electronic program guide,
As a solution to this problem, “the TV video is selected by the first information input means 1 and the video is selected as the moving picture data”. The compression encoding unit 9 generates compression information at a specified compression encoding rate, including sound information, and the compression definition data adding unit 10 declares and adds the compression encoding rate. Above, it records on the recording part 11 on the compression conditions designated by the compression coding rate control part 5. The electronic program guide superimposed on the television image input into the 2nd information input means 2 is 2nd information. The data is decoded by the decoding unit 3 and stored as data 15. The compression coding rate is generated by referring to the data 15 and creating the compression coding rate setting table 4 and compressing and coding according to the situation of the input image data. Start rate control unit 5 Were it is processing "(see Patent Document 1 Abstract) have been described.

  Further, Patent Document 2 has an object of “providing a high-efficiency encoding / recording apparatus that performs optimal encoding processing with a small amount of code by controlling encoding for each scene”. Separation by the scene classification circuit 107 based on the information on the genre of the video to be encoded obtained by the genre / keyword search circuit 103 and the image characteristic information obtained by the image characteristic calculation circuit 105 from the digital image data of this video. Encoding from the scene information database 104 based on the scene characteristic information representing the characteristics of each scene and the encoding result information on the code amount obtained by the code amount control circuit 219 by encoding the digital image data. The correction value of the parameter for controlling the processing is acquired by the database management circuit 108 and encoded by the acquired correction value Parameters corrected by circuit 109 corrects the parameters of the high-efficiency coding recording apparatus 10 "has been described (patent document 2 summarizes see) that.

  Patent Document 3 has a purpose of “remaining a specific scene at the time of editing, making it continuous data even after editing, reducing the amount of data, and improving user convenience”. A storage means storing a conversion table in which a ratio of converting a video signal into a predetermined image quality corresponding to the importance is stored, an importance determination means for determining the importance for each chapter of the video signal, and a conversion table And a video signal that outputs a video signal composed of chapters having different bit rates by linking the chapter with a bit rate conversion means for converting the video signal into a predetermined image quality for each chapter according to the determined importance. It has an output means "(see abstract of Patent Document 3).

JP 2002-44604 A JP 2006-311078 A JP 2008-35053 A

  For example, in Patent Document 1, the compression rate is determined based on genre information to which a program to be recorded belongs. Patent Document 2 further aims to increase the compression efficiency of the entire program by appropriately performing encoding processing by calculating the characteristics of image data for each scene. However, in these methods, the program / scene that the user wants to view with high image quality is recorded at a low compression rate, which may make it difficult to view the video. Further, in Patent Document 3, since a chapter is generated by determining a scene break from camera work, there is a possibility that the user's viewing request is not truly reflected.

  In order to solve the above problems, an embodiment of the present invention receives broadcast data including program data including video data and program related information related to the program, and separates the received broadcast data. The data rate of the video data included in the program data is changed based on the program related information separated from the broadcast data, and the video data with the changed data rate is recorded.

  According to the above means, video and the like can be recorded more efficiently on the recording medium, and user convenience can be improved. Specifically, it is possible to reduce the overall amount of recorded data while recording high-quality important scenes with high attention to the user, and to further improve the convenience of the recording / playback apparatus.

  Examples will be described below. However, the present invention is not limited to this embodiment.

<Description of broadcast stream in digital broadcasting>
In recent years, devices capable of recording and reproducing broadcast streams are becoming commonplace. A variety of recording formats are also becoming available.

  FIG. 1 shows a state of digital broadcast reception transmitted / received through a terrestrial TV tower or a broadcast satellite. A program transmitted from the broadcast apparatus 1 (or broadcast station) is transmitted to the relay station 2 or 3 once. The relay station 2 transmits program data to each home via a satellite using a predetermined carrier wave. The relay station 3 transmits program data to each home via an antenna using a predetermined carrier wave.

  In each home, for example, data transmitted from the relay station 2 or 3 is received using a receiving antenna and input to the receiving device 4. The receiving device 4 separates necessary data from the input data and decodes it.

  Further, a menu function or the like necessary for the user to operate the apparatus is generated in the receiving apparatus 4 and is transmitted to the display apparatus 5 in combination with the decoded data. The display device 5 displays the transmitted video data on a panel and outputs audio data from a speaker.

  There are various inputs and outputs of the receiving device 4 other than the above. An example of input is the content distribution server 6. An example of the output is an externally connectable recording / reproducing device 7 (for example, a DVD recorder), which is connected by, for example, an HDMI cable.

  Broadcast data sent from a broadcasting station includes not only video and audio data, but also, for example, caption data including character strings used for displaying captions, program information data describing the titles and contents of programs, names of performers, and services Information such as information (SI) data is included.

  For broadcast distribution from the network by the distribution server 6, the broadcast reception performed in the broadcast device 1 and the data format are the same.

<Description of device configuration>
Next, an example of a recording apparatus in the present embodiment is shown in FIG.

  Reference numeral 201 denotes an input I / F for connecting an antenna for receiving digital broadcasting. A digital broadcast receiving unit 202 analyzes the input digital broadcast and selects data to be viewed or recorded by the user of the apparatus. If the broadcast wave is encrypted, decryption processing is also performed here. Reference numeral 203 denotes a separation unit that separates input data from the digital broadcast receiving unit 202 or the HDD 211 into specific information such as video data, audio data, or caption information.

  A subtitle information processing unit 204 extracts subtitle data (character string) from the subtitle information data separated by the separation unit 203. The subtitle data extracted here is stored in, for example, the memory 216 by software processing. A decoding processing unit 205 decodes the video / audio data separated by the separation unit 203, for example, transfers the decoded data to the display device 5 to the decoded data, and superimposes the caption data stored in the memory 216 or the like to the panel. Processing for creating a display screen is also performed.

  Reference numeral 206 denotes an output terminal for connecting a display device (liquid crystal display, plasma panel display (PDP), organic EL display, etc.), for example. A data conversion processing unit 207 performs bit rate conversion, recording format conversion, and the like on input data. For example, MPEG2 format video data is converted to H.264-AVC, or MPEG2-AAC format audio data is converted to MPEG-BC, for example.

  The encryption / decryption processing unit 208 encrypts data when recording on a recording medium connected to the apparatus, and decrypts the encrypted data when reproducing from the recording medium. The recording / reproducing unit 209 controls recording and reading of data to and from a recording medium (HDD 211 in this figure) connected via the input / output terminal 210.

  The HDD 211 is a recording medium for storing data. In this figure, it is expressed that it is connected to the outside of the recording / reproducing apparatus 2, but the same effect can be obtained even if it is built in the recording / reproducing apparatus 2. In the embodiment of the present invention, the present invention can be applied to a recording medium different from the HDD portion.

  2 shows that data is recorded in H211 via the separation unit 203 and the data conversion processing unit 207. However, the data received by the digital broadcast receiving unit 202 is recorded in the recording / reproducing unit 209 and the input / output terminal 210. The data may be recorded in the HDD 211 as it is.

  The remote control I / F 212 receives a user operation and transmits a remote control code to the control unit 215. The input terminal 213 receives an operation with a remote controller. The operation unit 214 is an interface (I / F) through which a user directly performs operations such as recording and reproduction, and is, for example, a button attached to the casing of the recording / reproducing apparatus 3.

  The control unit 215 controls each block via the system bus 217. The memory 216 is a memory for storing data. The system bus 217 is a bus that performs data transmission between the blocks.

  Next, an example of the configuration of the data conversion processing unit 207 will be described with reference to FIGS. Reference numeral 301 denotes an input terminal to which a partial TS video signal is input. A decoding processing unit 302 decodes the input video signal.

  The encoding processing unit 303 performs data format conversion. For example, MPEG2 format data is converted to H.264 format. It is encoded into 264-AVC format data. H. In the 264-AVC format, fine control is possible by a combination of a plurality of compression methods (tools) and setting values in each method. For example, variable block size motion compensation, in-loop deblocking filter, weighted prediction, etc. are typical examples of tools.

  That is, as a method for changing the compression rate, for example, adjustment of the size of an image, selection of the compression method used at the time of encoding, and setting of coefficient values related to compression efficiency set at the time of using each compression method can be mentioned.

  In the encoding processing unit 303 of the present embodiment, the data compression rate is changed in accordance with whether or not the user desires to view each scene of the input data. It should be noted that the degree of desire may be provided in a plurality of stages instead of the two stages of whether viewing is desired or not.

  In the synthesizer 304, encoded video data and audio data, and accompanying data such as caption data and program information data as appropriate are appropriately input, and a partial TS format stream is generated. Further, the synthesis unit 304 reinserts time information PCR (Program Clock Reference) as appropriate.

  Reference numeral 305 denotes an output terminal for outputting the generated stream. The input terminal 306 receives data other than video data as input and transmits the data to the combining unit. In the system bus 307, a command from the control unit is transmitted to each block, and data is transmitted from each block to the control unit. An input / output terminal 308 connects the system bus 307 to the system bus 217.

  FIG. 4 shows a configuration when audio data is converted in the data conversion processing unit 207. The input terminal 301 to the input / output terminal 308 are the same as described with reference to FIG. Audio data is input at the input terminal 401. The audio decoding processing unit 402 decodes audio data input to the input terminal 401.

  The audio encoding processing unit 403 encodes the audio data decoded in 402 into a desired format.

  At this time, for example, the audio data can be dynamically changed according to the user's desire to view, as in the case of video. For the less important part, it is possible to record with no audio data or at a lower bit rate. However, even if the audio data can be corrected to reduce the amount of data, the effect is small compared to the amount of reduction of the video data. The input terminal 404 inputs data other than video / audio and transmits it to the synthesis unit.

  In the above example, an input terminal is provided for each video / audio data. However, the input may be received by a stream including all data and internally separated into individual data.

<Processing procedure>
Next, in the above configuration, operations from detection of caption information to change of encoding parameters will be described with reference to flowcharts of FIGS.

  The timing for executing this processing may be, for example, when recording a broadcast stream, when it is desired to reduce the capacity of data once recorded on a recording medium, or when outputting to another recording medium. If it is desired to reduce the capacity of data once recorded on the recording medium, the format of the recorded data may be converted and recorded again on the original recording medium.

  5 and 6 show an example of processing executed when a broadcast wave is recorded. First, the entire recording process will be described with reference to FIG. In step (hereinafter abbreviated as “S”) 501, recording processing is started. For example, it starts when a recording button is pressed or at a time reserved by the user. In the case of scheduled recording, the user may register one or more keywords such as a person name that is considered important, and may use it for the separation of important scenes.

  In step S502, the end of recording is determined. The end of the recording may be, for example, when the program reserved by the user ends or when the recording medium no longer has an area for recording. If a recording end command is transmitted to the control unit 215, the process branches to Yes to end the recording. Otherwise, the process proceeds to S503. In S503, a recording process is executed. While the recording process is being performed, the separation unit 203 transmits a partial TS including video / audio data of a stream designated by the user to the HDD 211.

  Next, details of the recording process are shown in FIG. In S601, subtitle information separated from the input stream is acquired and recorded on the memory 216, and the process proceeds to S602. In S602, the importance level of the scene is calculated based on the caption information acquired by the control unit 215, and the process proceeds to S603. This determination algorithm differs depending on the genre of the recorded program, and also differs depending on whether a keyword is specified by the user at the start of recording.

  As a simple example of the judgment, switching with or without subtitle information, switching with or without a specific proper noun, or when you find the “♪” symbol in subtitle text data, for example, in a song program, etc. It is also possible to judge that the importance is high by judging that the song is singing.

  Alternatively, for example, when a character that the user wants to see is specified among the characters included in the program information, it is possible to determine the level of importance by discriminating from the subtitle representing the line of the appearance scene. In S603, the control unit 215 determines whether or not a change in the importance level of the scene occurs. If it occurs (Yes), the process proceeds to S604, and if not (No), the process proceeds to S605.

  In addition, although the above showed the example using subtitle information, the information accompanying a program may be used, the information which shows the performer of a program, and the information of EPG (electronic program guide) may be used. Subtitle information and information on the performers of the program are also referred to as program-related information.

  In step S604, the control unit 215 changes the setting for the encoding processing unit 303 so that the bit rate after recording varies. As a simple example, the size of the angle of view at the time of recording is changed. If recording is performed in the H.264 format, it can be changed by changing a tool used for encoding. Alternatively, for example, it is possible to reduce the amount of data by performing encoding processing after thinning out high frequency component data. When the setting is changed, the process proceeds to S605.

  In S605, a recording operation is executed. The encryption / decryption processing unit 208 performs encryption processing on the data processed by the data conversion processing unit 207 as necessary. This may be performed according to copy control information included in the data to be recorded. The recording / reproducing unit 209 writes data to the HDD 211 and ends the process.

  Next, with reference to FIGS. 7 and 8, an example of a processing procedure in the case where the data once recorded on the recording medium is converted into a format and recorded on the original recording medium or output (dubbing processing) to another recording medium will be described. To do. In this case, if the subtitle data is also recorded in the HDD 211 at the time of the first recording, there is no need to acquire the subtitle information and perform analysis again. The data format when subtitle data is recorded in the HDD 211 is arbitrary, but it is recorded as information including the keyword in the subtitle information and the time when it appeared, or the importance level of the program is calculated and calculated. There is a method of recording information including switching time.

  In S701, a setting screen for the user to perform the dubbing process is displayed, and the process proceeds to S702. Examples of setting items include designation of a recorded program to be dubbed, designation of a recording medium to be dubbed, designation of a data rate after conversion, or designation of a format of video / audio data.

  In S <b> 702, the user performs necessary settings for each setting item, and instructs to start dubbing. In S703, dubbing is started and the process proceeds to S704. At this time, processing such as closing the displayed setting screen may be performed.

  In S704, the subtitle data already recorded in the HDD 211 is read, analyzed, and the process proceeds to S705. As a result, the control unit 215 can grasp at which timing the recording rate is changed. In S704, it is possible to grasp the timing (time) for changing the recording rate by performing the same processing as S601 to S604 in FIG.

  In step S705, it is determined whether dubbing is completed. The end of the recording is triggered by, for example, the user giving an instruction to stop the dubbing or the end of the dubbing process until the end of the designated recorded program. Or, a trigger may be generated inside the recording / reproducing apparatus such that the recording medium has no more recording area. When the termination command is transmitted to the control unit 215, the dubbing is terminated (Yes in S705). In step S706, dubbing processing is executed.

  FIG. 8 is a flowchart illustrating an example of the dubbing process. In S801, the control unit 215 acquires the dubbing time, and the process proceeds to S802. In step S802, the control unit 215 determines whether or not to change the recording rate by comparing the time for changing the recording rate as a result of the previous analysis in step S704 and the time acquired in step S801.

  If Yes in S802, the process proceeds to S803, and if No, the process proceeds to S804. In step S803, the control unit 215 changes the setting for the encoding processing unit 303 so that the bit rate after recording varies, and the process proceeds to step S804. In S804, a recording operation is executed.

  As an example of reading data from the HDD 211 and writing it back to the HDD 211, the recording / playback unit 209 reads the data from the HDD 211, and the encryption / decryption processing unit 208 performs a decoding process as appropriate. The encryption / decryption processing unit 208 performs encryption processing on the data processed by the data conversion processing unit 207 as necessary. The recording / reproducing unit 209 writes data to the HDD 211 and ends the process.

  In addition to data copying between built-in recording media, for example, even when dubbing to an externally connected recording / playback device 7, the same processing procedure is used when encoding and sending out within the recording / playback apparatus 10. An effect is obtained.

<Setting screen display during dubbing>
Next, FIG. 9 shows an example of a screen display for the user to change the setting at the start of dubbing. The outer frame shows the display device 5 and draws menu items in the display area 901. A list of programs recorded in the HDD 211 is displayed in the interior indicated by the dotted line 902. First, as shown in (a), the user selects a program to be dubbed from the list. When selected, the screen changes to a screen for setting details as shown in FIG. 9B and executing dubbing. As an example of the items to be set, there may be a plurality of dubbable recording media, so that a dubbing destination designation, a data rate after dubbing, and the like can be mentioned. It is also possible to set whether to change the rate with reference to subtitle information or the like.

  After making these settings, the user selects the execute button, for example, presses the enter key on the remote controller, and executes dubbing.

  For distribution from the distribution server and the network, for example, if the information accompanying the program is included as in broadcast reception, the same effect can be obtained by the same processing procedure in the configuration of the apparatus in which the network interface is added to the above-described embodiment. It is possible to obtain

The figure which shows the outline | summary of the broadcast reception in a present Example. The figure which shows an example of a structure of the recording / reproducing apparatus of a present Example The figure which shows an example of a structure of the data conversion process part of a present Example. The figure which shows an example of a structure of the data conversion process part of a present Example. Flow chart showing an example of recording process Flow chart showing an example of recording process Flow chart showing an example of dubbing processing Flow chart showing an example of dubbing processing The figure which shows an example of the screen which a user sets

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Broadcasting apparatus 2 Repeater 3 Repeater 4 Receiving apparatus 5 Display apparatus 6 Distribution server 7 Recording / reproducing apparatus 10 Recording / reproducing apparatus 201 Input terminal 202 Digital broadcast receiving part 203 Separation part 204 Subtitle information processing part 205 Decoding processing part 206 Output terminal 207 Data conversion processing unit 208 Encryption / decryption processing unit 209 Recording / reproducing unit 210 Input / output terminal 211 HDD
212 Remote control interface 213 Input terminal 214 Operation unit 215 Control unit 216 Memory 217 System bus 301 Input terminal 302 Decoding processing unit 303 Encoding processing unit 304 Synthesis unit 305 Output terminal 307 System bus 308 Input / output terminal 401 Input terminal 402 Audio decoding Processing unit 403 Audio encoding processing unit 404 Input terminal

Claims (13)

Receiving means for receiving broadcast data including program data including video data and program related information related to the program;
Separating means for separating broadcast data received by the receiving unit; data conversion processing means for changing a data rate of video data included in the program data;
A recording means for recording data;
Control means for analyzing the importance of the scene using the program-related information and controlling the data conversion processing means so as to change the data rate of the video data according to the importance of the scene. Recording device. The recording apparatus according to claim 1,
The recording apparatus according to claim 1, wherein the data conversion means changes a data rate of video data by selecting a compression method. The recording apparatus according to claim 1,
The recording apparatus according to claim 1, wherein the data conversion unit changes a data rate of video data by changing a setting value related to a change of an image compression rate of a compression method. The recording apparatus according to claim 1,
The video data rate change by the data conversion means is performed when the broadcast data is recorded on the recording medium. The recording apparatus according to claim 1,
Program data and program related information are recorded in the recording means,
The control means analyzes the importance of the scene of the video data recorded in the recording means using the program related information recorded in the previous recording means, and sets the data rate of the video data according to the importance of the scene. Recording apparatus characterized by controlling said data conversion processing means to change The recording apparatus according to claim 1, wherein
The recording apparatus, wherein the program related information is caption information. A receiving unit for receiving broadcast data including program data including video data and program related information related to the program;
A separation unit for separating broadcast data received by the reception unit;
A recording apparatus comprising: a recording unit configured to change a data rate of video data included in the program data based on program-related information separated from broadcast data by the separation unit, and to record the video data having the changed data rate . A recording unit for recording program data including video data and program-related information related to the program;
An output unit for changing the data rate of the video data included in the program data recorded in the recording unit based on the program-related information recorded in the recording unit, and outputting the video data in which the data rate is changed; Recording device having. The recording apparatus according to claim 7 or 8, comprising:
The data rate of the video data is changed by selecting a compression method or changing a setting value relating to a change in the image compression rate of the compression method. The recording apparatus according to any one of claims 7 to 9,
The recording apparatus, wherein the program related information is caption information. Receiving broadcast data including program data including video data and program related information related to the program;
Separating the received broadcast data;
A recording method for changing a data rate of video data included in the program data based on program-related information separated from the broadcast data, and recording the video data with the changed data rate. Record program data including video data and program related information related to the program,
A recording method for changing a data rate of video data included in the recorded program data based on the recorded program-related information and outputting video data with the changed data rate.   13. The recording method according to claim 11 or 12, wherein the program related information is caption information.

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