JP2004312304A - Decoding apparatus and method, reproducing apparatus and method, and storage media - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decoding apparatus and method, and a reproducing apparatus and method for actively utilizing a storage area of a storage medium, and also to provide a storage medium for improving the utility of the storage medium itself. <P>SOLUTION: The resolution of related information is converted to that of dynamic image information in the case that the dynamic image information and the related information of the predetermined resolution read from the storage medium, among a plurality of dynamic image information pieces of different resolutions encoded by the predetermined encoding system and stored in the storage medium and the related information of the predetermined resolution related to such dynamic image information, are respectively decoded, and the resolution of the relevant decoded dynamic image information is different from that of the related information. Moreover, a plurality of dynamic image information pieces of differen resolutions and the related information of the predetermined resolution related to the dynamic image information are encoded with the predetermined encoding system, and stored into one storage medium. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a decoding device and method, a reproducing device and method, and a storage medium, and is suitably applied to, for example, a reproduction device that reproduces an encoded stream stored in a storage medium.
[0002]
[Prior art]
Conventionally, in a storage medium for playing a movie, as shown in FIG. 6, a video stream encoded according to a predetermined encoding method is stored for each scene, and the video stream corresponding to each scene is stored. In addition, for example, two audio streams having different sound qualities and data of a plurality of subtitles corresponding to the language of the country (hereinafter, referred to as subtitle information) are encoded and stored by the encoding method.
[0003]
When a video stream having a resolution conforming to the NTSC (National Television System Committee) standard and a video stream having a resolution conforming to the HDTV (High Definition Television System) standard are stored in a storage medium, as shown in FIG. Separate storage media are used for video streams having different resolutions and corresponding subtitle information.
[0004]
When playing back the storage medium stored in this way, the playback device appropriately reads out a video stream, one corresponding audio stream and subtitle information from the storage medium for each scene, and sets a corresponding encoding method. A video signal, a caption signal, and an audio signal are generated by performing the decoding process according to the above-described method, and the video and the subtitle based on the video signal and the subtitle signal are displayed on the display unit, and the audio based on the audio signal is output from the speaker. It has been made.
[0005]
[Problems to be solved by the invention]
[0006]
By the way, in recent years, the amount of information stored in a storage medium has been improved, and if a plurality of video streams having different resolutions and corresponding subtitle information can be stored in one storage medium, for example, the NTSC system, Since various video devices such as a monitor and a playback device corresponding to only one resolution among various types such as the HDTV system or the PAL (Phase Alternation by Line) system can handle the video stream as they are, the storage is required. It is considered that the practicality of the media itself can be improved.
[0007]
In this case, if the playback device can play back a plurality of video streams having different resolutions by using the subtitle information corresponding to only one resolution, the plurality of subtitle information is not stored in the storage medium. It is considered that the storage area of the storage medium can be used more effectively.
[0008]
The present invention has been made in view of the above points, and provides a storage medium capable of improving the practicality of the storage medium itself, and a decoding apparatus, a decoding method, and a reproduction apparatus capable of effectively utilizing a storage area of the storage medium. And a reproduction method.
[0009]
[Means for Solving the Problems]
In order to solve such a problem, in the present invention, in a decoding device, a plurality of pieces of moving image information encoded at a predetermined encoding method and stored in a storage medium and having different resolutions from each other, and a predetermined Decoding means for decoding the moving picture information and the accompanying information of a predetermined resolution read from the storage medium among the accompanying information of the resolution, and the resolution and the accompanying information of the moving picture information decoded by the decoding means. And resolution conversion means for converting the resolution of the accompanying information to the resolution of the moving image information when the resolutions of the video data are different from each other.
[0010]
As a result, in this decoding device, even if the accompanying information corresponding to a plurality of pieces of moving image information having different resolutions from each other is not stored in the storage medium, the one piece of the accompanying information is shared and the resolution of each piece of moving image information is adjusted. Can be generated as accompanying information.
[0011]
Further, in the present invention, in the decoding method, a plurality of pieces of moving image information which are encoded by a predetermined encoding method and have different resolutions stored in a storage medium and accompanying information of a predetermined resolution accompanying the moving image information are included. A first step of decoding moving image information and ancillary information of a predetermined resolution read from the storage medium, and a resolution of the moving image information and the resolution of the ancillary information decoded in the first step. Are different from each other, the second step of converting the resolution of the accompanying information to the resolution of the moving image information;
Was provided.
[0012]
As a result, in this decoding method, even if the accompanying information corresponding to a plurality of pieces of moving image information having different resolutions from each other is not stored in the storage medium, the one piece of the accompanying information is shared to correspond to the resolution of each piece of moving image information. Can be generated as accompanying information.
[0013]
Further, according to the present invention, in the playback device, a plurality of pieces of moving image information having different resolutions and encoded with a predetermined encoding method and stored in a storage medium, Reading means for reading moving image information and accompanying information of a predetermined resolution from a storage medium, decoding means for decoding moving image information and accompanying information read by the reading means, and decoding means for decoding When the resolution of the moving image information and the resolution of the accompanying information are different from each other, a resolution conversion unit for converting the resolution of the accompanying information to the resolution of the moving image information is provided.
[0014]
As a result, in this reproducing apparatus, even if the accompanying information corresponding to a plurality of pieces of moving image information having different resolutions from each other is not stored in the storage medium, the one piece of the accompanying information is shared to correspond to the resolution of each piece of moving image information. It can be generated as accompanying information.
[0015]
Further, according to the present invention, in the reproducing method, a plurality of pieces of moving image information encoded by a predetermined encoding method and stored in a storage medium and having different resolutions from each other and ancillary information of a predetermined resolution accompanying the moving image information are included. A first step of reading moving image information and accompanying information of a predetermined resolution from a storage medium, a second step of decoding the moving image information and accompanying information read in the first step, When the resolution of the moving image information decoded in the step and the resolution of the accompanying information are different from each other, a third step of converting the resolution of the accompanying information into the resolution of the moving image information is provided.
[0016]
As a result, in this reproducing apparatus, even if the accompanying information corresponding to a plurality of pieces of moving image information having different resolutions from each other is not stored in the storage medium, the one piece of the accompanying information is shared to correspond to the resolution of each piece of moving image information. It can be generated as accompanying information.
[0017]
Further, in the present invention, a plurality of pieces of moving image information having different resolutions and accompanying information of a predetermined resolution accompanying the moving image information are encoded and stored by a predetermined encoding method in a storage medium.
[0018]
As a result, in this storage medium, for example, a video stream such as a monitor or a playback device corresponding to only one of the resolutions such as the NTSC system, the HDTV system, or the PAL system is used. Can be handled.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0020]
In FIG. 1, reference numeral 1 denotes a playback apparatus as a whole according to the present embodiment, which reads movie information from a storage medium 2 loaded at a predetermined position via a reading unit 3 and then reads the movie information via a decoding processing unit 4. A video based on the movie information is displayed on a monitor 5 corresponding to each of HDTV and NTSC, and a sound based on the movie information is output from a speaker 6.
[0021]
As shown in FIG. 2, the storage medium 2 stores, as movie information, a video stream (hereinafter, referred to as a video stream) having a resolution conforming to the HDTV system for each of a plurality of scenes SNi (i = 1, 2,..., N). HDVSi and a video stream having a resolution conforming to the NTSC system (hereinafter, referred to as a standard quality video stream) SDVSi are defined by a predetermined encoding method such as MPEG (Moving Picture Experts Group). And stored.
[0022]
Then, in correspondence with the video streams HDVSi and SDVSi of the respective scenes SNi, a high-quality audio stream (hereinafter, referred to as a high-quality audio stream) HDASi and a standard-quality audio stream (hereinafter, referred to as a high-quality audio stream) corresponding to a language of a predetermined country. , Which will be referred to as a standard quality audio stream). SDASi is encoded by a predetermined encoding method and stored.
[0023]
Further, a plurality of subtitle data (hereinafter referred to as subtitle information) IFi... Corresponding to the language of the country are respectively associated with the video streams HDVSi and SDVSi of each scene SNi. j (j = 1, 2,..., n) are encoded by a predetermined encoding method and stored. This subtitle information IFi. j is stored in a bitmap format as a resolution conforming to the HDTV system.
[0024]
Therefore, the storage medium 2 stores the video streams HDVSi and SDVSi having the resolutions conforming to the HDTV system and the NTSC system, and stores them in separate storage media for each video stream having one resolution as in the related art. In comparison with the case where the video stream is compatible with only one of the HDTV system and the NTSC system, a video stream such as a monitor or a playback device can handle a video stream as it is. ing.
[0025]
The playback apparatus 1 (FIG. 1) selects playback conditions such as video resolution, audio quality, subtitle language, and start scene when the movie information stored in the storage medium 2 is played back as described above. The selection can be made via the unit 7 and the result of the selection of the reproduction condition is transmitted to the reading unit 3 and the decoding processing unit 4 as data (hereinafter referred to as reproduction selection data) D1. .
[0026]
In this case, the reading unit 3 corresponds to one of the two video streams HDVSi and SDVSi, one of the two audio streams HDASi and SDASi, and the language of one country based on the reproduction command data D1. Subtitle information IFi. j are sequentially read from the storage medium 2 for each scene SNi and sent to the decoding processing unit 4.
[0027]
More specifically, when the reproduction command data D1 for reproducing, for example, standard-quality video, high-quality audio, and Japanese subtitles is given from the selection unit 7, the reading unit 3 reads the first scene SN1 (FIG. 2). , A standard-quality video stream SDVSi, a high-quality audio stream HDASi, and Japanese subtitle information IFi. 2 is sent to the decryption processing unit 4.
[0028]
Further, when the reproduction command data D1 for reproducing high-resolution video, high-quality audio, and Chinese subtitles from the eleventh scene SN11 is given from the selection unit 7, the reading unit 3 outputs the eleventh scene SN11. , The high-quality video stream HDVSi, the high-quality audio stream HDASi, and the Chinese subtitle information IFi. n to the decryption processing unit 4.
[0029]
The decoding processing unit 4 is configured to decode the video streams HDVSi, SDVSi, the audio streams HDASi, SDASi, and the subtitle information IFi. j by performing a predetermined reproduction process on the video and subtitle information IFi. The subtitle based on j is displayed on the monitor 5 and the audio based on the audio streams HDASi and SDASi is output from the speaker 6.
[0030]
In this way, the playback device 1 plays back the movie information in a combination corresponding to the playback condition selected via the selection unit 7, so that the performance of the speaker 7 at the time of playback and the playback environment such as the country are adapted. Video, subtitles, and audio can be appropriately reproduced from any scene.
[0031]
In practice, as shown in FIG. 3, the decoding processing unit 4 includes an audio decoding processing unit 10 and an image decoding processing unit 20, and the high-quality audio stream HDASi or HDASi supplied from the reading unit 3. The standard quality audio stream SDASi is input to the audio decoding processing unit 10, and the high quality video stream HDVSi or the standard quality video stream SDVSi and the subtitle information IFi. j to the image decoding processing unit 20.
[0032]
The audio decoding processing unit 10 sequentially performs a decoding process and a D / A (Digital / Analog) conversion process on the high-quality audio stream HDASi or the standard-quality audio stream SDASi according to a corresponding encoding method, and obtains the obtained HD. The audio signal S10 and the SD audio signal S11 are sent to the speaker 6 (FIG. 1). As a result, high-quality audio based on the HD audio signal S10 or standard-quality audio based on the SD audio signal S11 is output from the speaker 6.
[0033]
On the other hand, when the reproduction command data D1 for reproducing high-quality video is given from the selection unit 7, the image decoding processing unit 20 connects the connection piece 24a of the resolution changeover switch 24 to the first connection terminal 24b. In this case, the high-quality video stream HDVSi and the subtitle information IFi. j is input to the corresponding HD image decoding unit 21 and subtitle decoding unit 22.
[0034]
The HD image decoding unit 21 performs a decoding process on the high-quality video stream HDVSi according to the corresponding encoding method, and sends out the obtained HD video data D21 to the HD image synthesis unit 23.
[0035]
The subtitle decoding unit 22 outputs the subtitle information IFi. j is subjected to a decoding process according to the corresponding encoding method, and the obtained HD subtitle data D22 is sent to the HD image synthesizing unit 23.
[0036]
The HD image synthesizing unit 23 performs a D / A conversion process on each of the HD video data D21 and the HD subtitle data D22 to generate an HD video signal and an HD subtitle signal, and then superimposes the HD subtitle signal on the HD video signal. Then, the obtained superimposed signal S23 is transmitted to the monitor 5 via the resolution changeover switch 24. As a result, a high-quality video based on the HD video signal and a high-quality subtitle based on the HD subtitle signal are displayed on the monitor 5.
[0037]
On the other hand, when the reproduction command data D1 for reproducing the standard quality video is given from the selection unit 7, the image decoding processing unit 20 sets the connection piece 24a of the resolution changeover switch 24 to the second connection terminal 24c. . In this case, the standard-definition video stream SDVSi and the subtitle information IFi. j is input to the corresponding SD image decoding unit 25 and subtitle decoding unit 22.
[0038]
The SD image decoding unit 25 performs a decoding process on the standard image quality video stream SDVSi according to the corresponding encoding method, and sends out the obtained SD video data D25 to the SD image synthesis unit 27.
[0039]
The resolution conversion unit 26 reduces the aspect ratio of the subtitle image to, for example, 0.5 times the HD subtitle data D22 given from the subtitle decoding unit 22 as a result of performing the above-described processing by the subtitle decoding unit 22. A filtering process is performed using the filter coefficient to be performed, and the obtained SD subtitle data D26 (FIG. 4B) having a resolution conforming to the NTSC system is transmitted to the SD image synthesizing unit 27.
[0040]
The SD image synthesizing unit 27 performs a D / A conversion process on each of the SD video data D25 and the SD subtitle signal data D26 to generate an SD video signal and an SD subtitle signal, and then converts the SD subtitle signal into an SD video signal. The superimposed signal S27 thus obtained is sent to the monitor 5 via the resolution changeover switch 24. As a result, a video of standard quality based on the SD video signal S26 and subtitles of standard quality based on the SD subtitle signal S26 are displayed on the monitor 5.
[0041]
In this way, the image decoding processing unit 20 converts the HD subtitle data D22 having a resolution conforming to HDTV into the SD video data D26 having a resolution conforming to NTSC only when decoding the standard definition video stream SDVSi. , The one subtitle information IFi. j can be shared to generate SD subtitle data D26 corresponding to the resolution of each video stream HDVSi, SDVSi.
[0042]
In the case of this embodiment, in the reproducing apparatus 1, when the reproduction of the standard-quality video is selected via the selection unit 7, the resolution of the subtitles to be displayed together with the video can be changed stepwise. It has been done.
[0043]
Specifically, in the reproducing apparatus 1, a filter coefficient (a filter coefficient for reducing the aspect ratio of a subtitle image to 0.5 times) for converting to a resolution conforming to the NTSC system, and a higher resolution than the resolution in a stepwise manner. Are selected via the selection unit 7 (FIG. 1), and various filter coefficients (for example, filter coefficients for reducing the aspect ratio to 0.65 times, 0.75 times,... The obtained filter coefficient is sent to the resolution conversion unit 26 as filter coefficient designation data D10.
[0044]
In this case, the resolution conversion unit 26 has various filter coefficients to be selected via the selection unit 7 in the internal memory, reads out a filter coefficient corresponding to the filter coefficient designation data D10 given from the selection unit 7, and By applying a filtering process to the HD subtitle data D22 with the read filter coefficients, SD subtitle data D26 is generated and transmitted to the SD image reproduction unit 27.
[0045]
Therefore, when a filter coefficient for converting the resolution to a higher resolution than the resolution conforming to the NTSC standard is selected, the subtitle enlarged to be larger than the subtitle conforming to the NTSC standard is displayed on the monitor 5. You.
[0046]
In this way, the resolution conversion unit 26 converts the resolution of the HD subtitle data D22 into a resolution conforming to the NTSC standard or a higher resolution according to the filter coefficient selected via the selection unit 7, Subtitles larger than subtitles having a resolution conforming to the NTSC standard can be displayed on the monitor 5 in response to a user's request to be selected via the selection unit 7.
[0047]
Here, the image reproduction processing in the reproduction apparatus 1 as described above can also be realized by software processing according to the image reproduction processing procedure RT shown in FIG.
[0048]
That is, the playback apparatus 1 is stored in advance in a data storage memory under the control of a control unit (not shown) including a data storage memory, a work memory, and a CPU (Central Processing Unit) provided therein, for example, when the power is turned on. The read predetermined image reproduction program is read out to the work memory, and the image reproduction processing procedure RT is started in step SP1, and then proceeds to step SP2.
[0049]
Then, in step SP2, the reproducing device 1 causes the reproducing unit to select a reproducing condition via the selecting unit 7, and proceeds to step SP3 to determine whether or not reproduction of standard-quality video is selected.
[0050]
Here, as a result of the determination in step SP3, when the reproduction device 1 selects to reproduce the video of the standard image quality, the process proceeds to step SP4, in which the selection unit 7 selects the filter coefficient for converting the resolution. The process proceeds to step SP5, and the standard-quality video stream SDVSi and the subtitle information IFi... Of the predetermined scene SNi are selected according to the reproduction condition selected in step SP2. j is read, and the process proceeds to the next step SP6.
[0051]
Then, in this step SP6, the reproducing apparatus 1 sets the standard image quality video stream SDVSi and the subtitle information IFi. j, respectively, to generate SD video data D25 and HD subtitle data D22 by performing a decoding process, and to apply a filtering process to the HD subtitle data D22 with the filter coefficient selected in step SP4 to obtain SD video data D25 and HD subtitle data D22. The subtitle data D26 is generated, and the process proceeds to step SP7.
[0052]
Next, in step SP7, the playback device 1 performs a D / A conversion process on the SD video data D25 and the SD subtitle data D26, respectively, to generate an SD video signal and an SD subtitle signal. After sending the superimposition signal S27 generated by superimposing the subtitle signal to the monitor 5, the process returns to step SP5, and returns to the standard image quality video stream SDVSi of the next scene SNi and the subtitle information IFi. Read j.
[0053]
On the other hand, as a result of the determination in step SP3, when the reproduction of the standard quality image is not selected, the reproducing device 1 proceeds to step SP5, and according to the reproduction condition selected in step SP2. The high-quality video stream HDVSi of the predetermined scene SNi and the subtitle information IFi. j is read, and the process proceeds to the next step SP6.
[0054]
Then, in step SP6, the reproducing device 1 sets the high-quality video stream HDVSi and the subtitle information IFi. j is subjected to a decoding process to generate HD video data D21 and HD subtitle data D22. At this time, the process proceeds to step SP7 without performing the filtering process on the HD subtitle data D22.
[0055]
Next, in step SP7, the playback device 1 generates an HD video signal and an HD subtitle signal by performing a D / A conversion process on the HD video data D21 and the HD subtitle data D22, respectively. After transmitting the superimposed signal S23 generated by superimposing the subtitle signal to the monitor 5, the process returns to step SP15, and returns to the high-quality video stream HDVSi of the next scene SNi and the subtitle information IFi. Read j.
[0056]
In this way, the playback device 1 can realize the image playback process by software processing.
[0057]
In the configuration described above, the playback device 1 performs the subtitle information IFi... Among the high-quality video stream HDVSi and the standard-quality video stream SDVSi stored in the storage medium 2. j only when the standard-definition video stream SDVSi having a different resolution from the subtitle information IFi.j is read from the storage medium. j is decoded and then converted to the resolution of the standard definition video stream SDVSi.
[0058]
Therefore, the playback device 1 can store the single subtitle information IFi... Without storing the subtitle information corresponding to the resolutions of the high-quality video stream HDVSi and the standard-quality video stream SDVSi in the storage medium 2. j can be shared and generated as SD subtitle data D26 corresponding to the resolution of each video stream HDVSi, SDVSi, so that the storage area of the storage medium 2 can be effectively utilized.
[0059]
At this time, the playback device 1 allows the user to select various filter coefficients for converting the resolution of the HD subtitle data D22, and according to the selected filter coefficients, changes the resolution of the SD subtitle data D26 to the resolution of the standard definition video stream SDVSi. Converted to above.
[0060]
Therefore, the playback device 1 can display subtitles larger than subtitles having a resolution conforming to the NTSC system on the monitor 5 in response to a user's request to be selected via the selection unit 7, so that the reproduction device 1 can be viewed from a relatively long distance. Even in a reproduction environment such as a case, it is possible to avoid a situation in which subtitles are difficult to see, and it is possible to expect a so-called barrier-free effect for a user having weak vision.
[0061]
In the storage medium 2, the high-quality video stream HDVSi and the standard-quality video stream SDVSi having different resolutions from each other, and one subtitle information IFi. j is encoded by a predetermined encoding method and stored.
[0062]
Therefore, in the storage medium 2, for example, a video stream such as a monitor or a playback device corresponding to only one resolution among the various types of the NTSC system and the HDTV system can be handled as it is. Therefore, the practicality of the storage medium 2 itself can be improved.
[0063]
According to the above configuration, of the high-quality video stream HDVSi and the standard-quality video stream SDVSi stored in the storage medium 2, the subtitle information IFi. j
Only when the standard definition video stream SDVSi having a different resolution from the subtitle information IFi. j is decoded and then converted to the resolution of the standard definition video stream SDVSi, so that the one subtitle information IFi. j can be shared to generate SD subtitle data D26 corresponding to the resolution of each of the video streams HDVSi and SDVSi, and thus the storage area of the storage medium 2 can be effectively utilized.
[0064]
In the above-described embodiment, a case is described in which two high-quality video streams HDVSi and standard-quality video streams SDVSi are stored in the storage medium 2 for each scene SNi as a plurality of pieces of moving image information having different resolutions. However, the present invention is not limited to this, and in addition to these, moving image information having a resolution conforming to another method may be stored in the storage medium 2, or the high-quality video stream HDVSi and the standard-quality video may be stored. Two or more pieces of moving image information having different resolutions based on a method other than the stream SDVSi may be stored.
[0065]
In this case, moving image information does not have to be stored in the storage medium 2 for each scene SNi, and the video contents of a plurality of pieces of moving image information stored in the storage medium 2 may be different.
[0066]
In the above-described embodiment, character information IFi. j has been described as being stored in the storage medium 2. However, the present invention is not limited to this. For example, a predetermined character may be stored in the storage medium 2, and various other accompanying information may be stored in the storage medium 2. It can be applied to the invention.
[0067]
In this case, the resolution of the accompanying information may be the same as any one of the resolutions of the plurality of pieces of moving image information stored in the storage medium 2, and does not belong to any of the resolutions of the plurality of pieces of moving image information. Original resolution may be used.
[0068]
Further, in the above embodiment, the video streams HDVSi, SDVSi and the subtitle information IFi. j has been described as being configured by the HD image decoding unit 21, the subtitle decoding unit 22, and the SD image decoding unit 25. However, the present invention is not limited to this. Various other decoding means can be applied to the present invention.
[0069]
Further, in the above-described embodiment, the video streams HDVSi, SDVSi and subtitle information IFi. Although the case where the reading means for reading j is constituted by the reading unit 3 has been described, the present invention is not limited to this, and reading means having various other structures can be applied to the present invention.
[0070]
Further, in the above-described embodiment, the resolution of the HD subtitle data D22 is converted to the resolution of the SD video data D25 by performing a filtering process on the HD subtitle data D22 with a predetermined filter coefficient. Although the case where the resolution conversion unit 26 that generates the data D26 is applied to the present invention has been described, the present invention is not limited to this. For example, the HD subtitle data D22 is subjected to interpolation processing for thinning out the pixels of the subtitle image. Accordingly, various other resolution converting means such as a resolution converting means for generating the SD subtitle data D26 can be applied to the present invention.
[0071]
Further, in this case, the selection unit 7 as a selection unit for selecting the conversion ratio of the resolution of the HD subtitle data D22 allows various filter coefficients for stepwise converting the resolution of the HD subtitle data D22 to be selected as the conversion ratio. However, the conversion ratio in the resolution conversion unit may be selected, for example, by selecting the ratio of thinning out the pixels of the subtitle image as the conversion ratio, or independently of the conversion content of the resolution conversion unit. You may make it select the conversion ratio of the resolution of HD subtitle data D22.
[0072]
Further, in this case, the selection means may be selected by an input from the operation unit, for example, or may be selected by voice, and can be applied to various other methods.
[0073]
Further, in the above-described embodiment, the case has been described where the resolution of the HD subtitle data D22 is converted to be equal to or higher than the resolution of the SD video data D25 by the resolution conversion unit 26 according to the selected filter coefficient. The present invention is not limited to this, and the color may be changed at the same time as the resolution of the SD video data D25 or higher according to the selected filter coefficient. In this case, if different colors are associated with the various filter coefficients and changed, the resolution of the subtitle can be recognized only by visually observing the color of the subtitle displayed on the monitor 5, and the usability is improved. be able to.
[0074]
Further, in the above-described embodiment, a case has been described in which the reproducing apparatus 1 shown in FIGS. 1 and 3 is applied to the present invention. However, the present invention is not limited to this, and the reproducing apparatus 1 may have various other configurations. The device can be applied to the present invention. Further, in this case, the image decoding processing unit 20 may be a decoding device separate from the playback device 1, and in this case, a decoding device having a configuration other than the configuration of the image decoding processing unit 20 may be used.
[0075]
【The invention's effect】
As described above, according to the present invention, in a decoding apparatus, a plurality of pieces of moving image information having different resolutions and encoded with a predetermined encoding method and stored in a storage medium, and a predetermined resolution associated with the moving image information. Decoding means for decoding the moving image information and the accompanying information of a predetermined resolution read from the storage medium among the accompanying information, and the resolution of the moving image information and the accompanying information of the moving image information decoded by the decoding means. When the resolutions are different from each other, a resolution conversion unit that converts the resolution of the accompanying information into the resolution of the moving image information is provided, so that the accompanying information corresponding to the plurality of moving image information is stored in the storage medium. Alternatively, the one piece of additional information can be shared and generated as additional information corresponding to the resolution of each moving image information. The storage area can be effectively used.
[0076]
Further, according to the present invention, in a decoding method, a plurality of pieces of moving image information which are encoded by a predetermined encoding method and have different resolutions stored in a storage medium and accompanying information of a predetermined resolution attached to the moving image information A first step of decoding moving image information and ancillary information of a predetermined resolution read from a storage medium, respectively; and a resolution of the moving image information decoded in the first step and a resolution of ancillary information. And a second step of converting the resolution of the accompanying information into the resolution of the moving image information when the two are different from each other, whereby the accompanying information corresponding to the plurality of moving image information is stored in the storage medium. Alternatively, the one piece of additional information can be shared and generated as additional information corresponding to the resolution of each moving image information. It is possible to effectively utilize the space.
[0077]
Further, according to the present invention, in the playback apparatus, a plurality of pieces of moving image information having different resolutions and encoded with a predetermined encoding method and stored in a storage medium and accompanying information of a predetermined resolution accompanying the moving image information are included. A reading unit that reads the moving image information and the accompanying information of a predetermined resolution from the storage medium, a decoding unit that decodes the moving image information and the accompanying information read by the reading unit, and a decoding unit that decodes the moving image information and the accompanying information. When the resolution of the moving image information and the resolution of the accompanying information are different from each other, a resolution conversion unit that converts the resolution of the accompanying information to the resolution of the moving image information is provided. Even if the corresponding accompanying information is not stored in the storage medium, the one accompanying information is shared and used as the accompanying information corresponding to the resolution of each moving image information. It can be formed, thus, it is possible to effectively use the storage area of the storage medium.
[0078]
Further, according to the present invention, in the reproducing method, a plurality of pieces of moving image information which are encoded by a predetermined encoding method and stored in the storage medium and have different resolutions from each other, and accompanying information of a predetermined resolution accompanying the moving image information are included. A first step of reading the moving image information and the accompanying information of a predetermined resolution from the storage medium, a second step of decoding the moving image information and the accompanying information read in the first step, When the resolution of the moving image information decoded in the step and the resolution of the accompanying information are different from each other, the third step of converting the resolution of the accompanying information to the resolution of the moving image information is provided. Even if the accompanying information corresponding to the plurality of pieces of moving image information is not stored in the storage medium, the one piece of the accompanying information is shared, and It can be generated as information, thus, it is possible to effectively use the storage area of the storage medium.
[0079]
Further, in the present invention, in a storage medium, a plurality of pieces of moving image information having different resolutions from each other and accompanying information of a predetermined resolution accompanying the moving image information are encoded and stored by a predetermined encoding method. Thus, for example, various video devices such as a monitor and a playback device corresponding to only one of the resolutions such as the NTSC system, the HDTV system, and the PAL system can handle the video stream as they are. Thus, the practicality of the storage medium itself can be improved.
[0080]
[Brief description of the drawings]
FIG. 1 is a block diagram showing the overall configuration of a playback device according to the present embodiment.
FIG. 2 is a schematic diagram illustrating storage contents of a storage medium.
FIG. 3 is a block diagram illustrating a configuration of a reproduction processing unit.
FIG. 4 is a schematic diagram for explaining resolution conversion;
FIG. 5 is a flowchart illustrating an image reproduction processing procedure.
FIG. 6 is a schematic diagram showing storage contents (1) of a conventional storage medium.
FIG. 7 is a schematic diagram showing storage contents (2) of a conventional storage medium.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Playback apparatus, 2 ... Storage medium, 3 ... Read-out part, 4 ... Decoding processing part, 5 ... Monitor, 6 ... Speaker, 7 ... Selection part, 20 ... Image decoding processing part , 21 ... HD image decoding unit, 22 ... subtitle decoding unit, 23 ... HD image synthesis unit, 25 ... SD image decoding unit, 26 ... resolution conversion unit, 27 ... SD image synthesis unit, RT: Image reproduction processing procedure.

Claims (7)

Among a plurality of pieces of moving image information having different resolutions, which are encoded by a predetermined encoding method and stored in the storage medium and have different resolutions, are read out from the storage medium among the accompanying information of a predetermined resolution accompanying the moving image information. Decoding means for decoding the moving image information and the accompanying information of the predetermined resolution,
When the resolution of the moving image information decoded by the decoding unit and the resolution of the accompanying information are different from each other, a resolution conversion for converting the resolution of the accompanying information to the resolution of the moving image information. Decoding means. A selecting unit for selecting a conversion ratio of the resolution of the accompanying information,
The resolution conversion means,
2. The decoding apparatus according to claim 1, wherein the resolution of the accompanying information is converted to be equal to or higher than the resolution of the moving image information in accordance with the conversion ratio selected by the selection unit. The resolution conversion means,
3. The decoding apparatus according to claim 2, wherein the color of the accompanying information is changed according to the conversion ratio selected by the selection unit. Among a plurality of pieces of moving image information having different resolutions, which are encoded by a predetermined encoding method and stored in the storage medium and have different resolutions, are read out from the storage medium among the accompanying information of a predetermined resolution accompanying the moving image information. A first step of decoding the video information and the accompanying information of the predetermined resolution, respectively;
When the resolution of the moving image information decoded in the first step and the resolution of the accompanying information are different from each other, the resolution of the accompanying information is converted to the resolution of the moving image information. 2. A decoding method, comprising: A plurality of pieces of moving image information having different resolutions, which are encoded by a predetermined encoding method and stored in a storage medium, and ancillary information of a predetermined resolution accompanying the moving image information, the moving image having the predetermined resolution Reading means for reading information and the accompanying information from the storage medium;
Decoding means for decoding the moving picture information and the accompanying information read by the reading means,
When the resolution of the moving image information decoded by the decoding unit and the resolution of the accompanying information are different from each other, a resolution conversion for converting the resolution of the accompanying information to the resolution of the moving image information. Means for reproducing information. A plurality of pieces of moving image information having different resolutions, which are encoded by a predetermined encoding method and stored in a storage medium, and ancillary information of a predetermined resolution accompanying the moving image information, the moving image having the predetermined resolution A first step of reading information and said accompanying information from said storage medium;
A second step of decoding the moving image information and the accompanying information read in the first step;
When the resolution of the moving image information decoded in the second step and the resolution of the accompanying information are different from each other, a second step of converting the resolution of the accompanying information to the resolution of the moving image information is performed. 3. A reproducing method, comprising the steps of: A plurality of pieces of moving image information having different resolutions,
A storage medium, characterized in that the accompanying information of a predetermined resolution accompanying the moving image information is encoded and stored by a predetermined encoding method.

Images