JP2005117439A - Recording and reproducing device, and recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording and reproducing device capable of recording image and sound information on a recording medium with a progressive image of 24 frames per second, and reproducing the image and sound information. <P>SOLUTION: An image is obtained from an input part 103 with a progressive image of 24 frames per second, an encoding/decoding part 104 performs encoding and compressing processing, and a drive 107 records the image and sound information on a recording medium 108. When the image and sound information is reproduced, an image-converting part 105 performs image conversion on an interlaced image of 60 frames per second, and the encoding/decoding part 104 performs decoding and decompression processings, subsequently reproducing image and sound information. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a recording / reproducing technique for recording image / audio information on a recording medium and reproducing the image / audio information recorded on the recording medium, and more particularly to a progressive image recording / reproducing technique.

  In recent years, optical discs typified by so-called DVDs (Digital Versatile Discs) have become widespread. These optical discs can record high-quality video and audio information. For example, by recording large-capacity content such as movies and playing them back on a player, powerful video that looks like a movie theater in the home. Can enjoy.

  As one of recording techniques for high-quality image / audio signals, an image processing apparatus that records and reproduces a progressive image of 24 frames / second is known (see, for example, Patent Document 1).

JP-A-8-186812

  In recent years, a reproducing apparatus that reproduces a large-capacity recording medium on which high-quality video / audio information is recorded, for example, a recording medium such as an optical disk, has various functions. In addition, as described above, a reproducing apparatus capable of reproducing a 24 frame / second progressive image has appeared.

  In current movie shooting, it is mainstream to record 24 frames / second progressively on film media, but in the future, large-capacity data such as movies will be stored on an optical disk such as a DVD at 24 frames / second. It is conceivable that recording will be progressive and will be played back by the player.

  In such a case, it is convenient to have a recording / reproducing apparatus that records a progressive image of 24 frames / second on a recording medium and has reproduction compatibility with the reproducing apparatus.

  In the conventional technology, an interlaced image of 60 fields / second is captured and converted to a progressive image of 24 frames / second. However, it is considered that the progressive image itself of 24 frames / second is captured when the image is captured. It wasn't.

  An object of the present invention is to capture a progressive image of 24 frames / second, a function of recording the captured image information and audio information on a recording medium through processing such as encoding, and 24 frames / second It is an object to provide a recording / reproducing apparatus having a function of reproducing image / audio information recorded as a progressive image, and a recording method therefor.

In order to achieve the above object, the present invention records video and audio information on a recording medium,
In a recording / reproducing apparatus for reproducing image / audio information recorded on the recording medium,
When recording the image and sound information,
Provided is a recording / reproducing apparatus that captures the image information as a progressive image of 24 frames / second.

Further, the present invention provides a recording / reproducing apparatus characterized in that the reproducing apparatus has an image converting means, and the captured image can be recorded by the image converting means.
Further, the image / audio information recorded on the recording medium, or information indicating the image format recorded on the recording medium, for example, information indicating that the data is recorded as a progressive image of 24 frames / second is recorded. Thus, there is provided a recording / reproducing apparatus and a recording method characterized in that, when an image recorded by the various methods is reproduced, the image is reproduced based on the recorded information.

  By using the recording / reproducing apparatus and the recording method according to the present invention, it is possible to record image / audio information on an optical disc with a progressive image of 24 frames / second in the same manner as a movie to be recorded on a film, and reproduce it by the recording / reproducing apparatus. In addition to being possible, it can also be played back on other playback devices, so that film-like images can be easily enjoyed at home.

  In addition, an effect of improving the encoding efficiency can be obtained as compared with the case of capturing and encoding an interlaced image of 60 fields / second as in the prior art.

  A specific embodiment of a playback apparatus according to the present invention will be described below with reference to the accompanying drawings as an example of a video camera for recording on an optical disc such as a DVD.

  FIG. 1 shows a block diagram of a recording / reproducing apparatus as an embodiment to which the present invention is applied.

  In FIG. 1, 101 is a system control unit, 102 is a user I / F, 103 is an input unit, 104 is a code / composite unit, 105 is an image conversion unit, 106 is a RAM (Random Access Memory), 107 is a drive, Reference numeral 108 denotes an optical disk such as a DVD, and 109 denotes an output unit.

  The system control unit 101 performs a control operation of each unit based on a user instruction input via the user I / F 102. Further, a program for performing the control is stored in the RAM 106, and the system control unit 101 reads out a necessary program as appropriate according to the control contents and executes the processing.

  First, a method for recording image / audio information on an optical disk 108 as a recording medium in the recording / reproducing apparatus of the present embodiment will be described with reference to FIGS.

  In this embodiment, the audio / video information recorded on the optical disc 108 is managed as a file with a directory structure as shown in FIG. 2, for example. Under the root directory 200, a plurality of subdirectories 201, 203, 206. . . Is placed.

  The subdirectory 201 is a directory for storing information for managing all data recorded on the optical disc 108, and stores a management information file 202. The management information file 202 is updated with the data recorded on the optical disc 108 as it is updated.

  Further, the subdirectory 203 is a directory for storing a playlist file for performing reproduction control of image / audio information. For example, as shown in FIG. 2, the playlist file 1_204 and the playlist file 2_205 are stored therein. The playlist file 1_204 or the playlist file 2_205 is a file describing a reproduction order or the like when reproducing the audio / video information files 207 and 208.

  The subdirectory 206 is a directory for storing image / audio information files, and stores image / audio information files 207 and 208 recorded in, for example, MPEG-2 TS (Transport Stream).

  Note that the directory structure and the type of file to be recorded shown in FIG. 2 are examples, and the present invention is not limited to this.

  The input unit 103 plays a role of inputting a CCD that converts an optical signal into an electrical signal, an analog signal, and an A / D converter that converts an analog signal into a digital signal. In this embodiment, the input unit 103 operates to capture a progressive image at 24 frames / second.

  The audio / video information input from the input unit 103 is encoded by the encoding / decoding unit 104 by a predetermined encoding method, for example, the MPEG2 method, and is compressed and sequentially multiplexed with the image information and the audio information. At this time, in this embodiment, the image information captured from the input unit 103 is a progressive image of 24 frames / second, and the image is encoded and compressed.

  The multiplexed stream data is temporarily stored in the RAM 106 and is sequentially recorded from the drive control unit 107 to the optical disk 108. At this time, the system control unit 101 may monitor the data volume stored in the RAM 106 and write the stored data to the optical disk 108 when a certain capacity is exceeded.

  The image conversion unit 105 performs processing for converting the progressive image of 24 frames / second captured by the input unit 103 into, for example, an interlaced image of 60 fields / second. The image conversion unit 105 is used when the 24 frames / second progressive image captured by the input unit 103 is converted into an interlaced image of 60 fields / second, for example. In this case, for example, a menu screen as shown in FIG. 3 is displayed under the control of the system control unit 101 so that the user can select an image format to be recorded at the start of recording. At this time, if the user gives an instruction to record an interlaced image of 60 fields / second, the system control unit 101 recognizes the instruction, performs image conversion processing by the image conversion unit 105, and records it on the optical disk 108. Specific image conversion processing will be described later.

  Further, in parallel with encoding by the encoding / decoding unit 104, it is also possible to perform image conversion by the image conversion unit 105. For example, a 24 frame / second progressive image captured by the input unit 103 is encoded by the encoding / decoding unit 104 and recorded on the optical disc 108, and the 24 frame / second progressive image is transmitted through the image conversion unit 105. It is also possible to convert to an interlaced image of 60 fields / second and record it on the optical disc 108. Thus, it is possible to record two types of image formats on the optical disc 108 by one image recording, in other words, the same image data can be recorded on a recording medium by different image formats. Specifically, it is realized by the processing shown in FIG. 4 under the control of the system control unit 101.

  The encoding / decoding unit 104 is shown as a group, and is configured of, for example, a portion that encodes a progressive image of 24 frames / second and a portion that encodes an interlaced image of 60 fields / second. Of course, not only the two images but also various image information may be encoded.

  In this case, an example in which the same moving image data is simultaneously recorded by different image methods will be described with reference to FIG.

  In step S400 of FIG. 4, an image is captured with a progressive image of 24 frames / second. Next, in step S401, the encoding / decoding unit 104 performs encoding processing and compression processing corresponding to the 24 frame / second progressive image on the 24 frame / second progressive image captured in step S400. The encoded data is stored in the RAM 106, for example.

  First, recording of a progressive image at 24 frames / second will be described. In step S410, the drive 107 performs a process of writing the data stored in the RAM 106 onto the optical disc 108. After completion of the writing process, the recording process of the progressive method at 24 frames / second is ended in step S411.

  Next, when recording an interlaced image of 60 frames / second, image conversion processing is performed in step S420. Specifically, the data stored in the RAM 106 is sent to the image conversion unit 105 and converted from a progressive image of 24 frames / second to an interlaced image of 60 frames / second. In step S421, a process of writing an interlaced image of 60 frames / second on the optical disc 108 is performed. After the end of the writing process, the 60-field / second interlace recording process is ended in step S422. The above is an example of simultaneously recording the same moving image data with different image formats. Although the RAM 106 stores data, the RAM may be attached to the encoding / decoding unit 104 and the image conversion unit 105 to store the data.

  In addition, image conversion may be performed before encoding. Specifically, an image captured at a progressive rate of 24 frames / second is configured to be stored in, for example, a RAM (not shown) associated with the encoding / decoding unit 104. On the other hand, after the image stored in the RAM 106 is encoded according to a progressive image of 24 frames / second, the drive 107 performs a writing process on the optical disk 108. On the other hand, after the image stored in the RAM 106 is converted into an interlaced image of 60 fields / second by the image conversion unit 105, an encoding process corresponding to the interlaced image of 60 fields / second is performed, and a writing process is performed on the optical disk 108. .

  Also in the example described above, the same moving image data can be recorded simultaneously by different image methods.

  FIG. 5 shows an example of simultaneously recording the same image data in different image formats by converting a 24 frame / second progressive image into a 60 frame / second interlaced image and then performing encoding / compression processing. Yes. Specifically, the 24 frames / second progressive image captured in step S500 of FIG. 5 is converted into an interlaced image of 60 fields / second in step S520, and then encoding / compression processing is performed in step S521. Thereafter, the recording process may be terminated in step S523 after the writing process to the optical disc 108 is performed in step S522. Note that the processing contents of steps from step S510 to step S512, which indicate a progressive image recording process of 24 frames / second, are not different from the example shown in FIG. As described above, the encoding / decoding unit 104 may perform encoding after image conversion, or may be encoded by the encoding / decoding unit 104 without performing image conversion.

  In addition, when the image / audio information file is recorded on the optical disc 108 by the above-described procedure, information on the image format of the image / audio information file may be recorded together. Information relating to the image format of the recorded image / audio information file, that is, whether the recorded image format is 24 frames / second progressive or another image format, for example, 60 fields / second interlace, may be discriminated. . Specifically, if the header portion in the video / audio information stream is 24 frames / second progressive, the binary number is 00, if it is 60 fields / second interlaced, the binary number is 01, and if the other method is binary, the binary number is used. It is sufficient to describe information such as 10 so that the bit can be discriminated. In addition to the above, it may be recorded in the playlist file shown in FIG. 2, or in a file that is not shown in FIG. 2, but is paired with an image / audio information file such as a clip information file, etc. Various modifications are possible and are not particularly limited.

  Further, the audio / video information recorded as a progressive image of 24 frames / second on the optical disk 108 may be converted into an interlaced image of 60 fields / second, or vice versa. Further, the original image / audio information is left after the conversion, and the image / audio information file recorded by the different image formats before and after the conversion is recorded on the optical disk 108, or only the converted data is stored in the optical disk 108. Various modifications are possible, such as recording in In addition, the image conversion unit 105 may not only perform image conversion between a progressive image of 24 frames / second and an interlaced image of 60 fields / second, but may have a conversion function to other image formats.

  The encoding / decoding unit 104 is shown in a lump, but a complex configuration in which a part of encoding is performed by hardware and the other processes are performed by software controlled by the system control unit 101. It may be realized by.

  The above is an example of the recording method of image / audio information in the recording / reproducing apparatus of the present embodiment.

  Next, a method for reading and reproducing image / audio information from an optical disk as a recording medium in the recording / reproducing apparatus of the present embodiment will be described with reference to FIGS.

  In FIG. 1, the audio / video information recorded on the optical disc 108 is read from an arbitrary position on the optical disc 108 by the drive 107 from the optical disc 108 by a flow reverse to the recording operation described above. The read video / audio information is temporarily stored in the RAM 106 as stream data, and then the video / audio data is separated and decoded by the encoding / decoding unit 104 and output from the output unit 109 in an arbitrary signal format.

  As with recording, the system control unit 101 controls the above-described units by loading a control program stored in the RAM 106. Prior to reading the stream data, the playback operation is described in an information file for controlling playback recorded on the optical disc 108, such as a playlist file shown in FIG. 2 or a clip information file (not shown). Playback is performed based on information that controls the playback order. Also, a user instruction input input via the user I / F 102 is recognized by the control unit 101, and reproduction is executed based on the user instruction. At this time, it is necessary to perform different processing depending on whether the video / audio information to be reproduced is recorded as a progressive image of 24 frames / second or an interlaced image of 60 fields / second.

  Hereinafter, image conversion processing executed by the system control unit 101 during reproduction will be described with reference to FIG. First, when reproduction preparation is started in step S600, a read process of the image / audio information file recorded on the optical disc 108 is executed in step S601.

  In the next step S602, the system control unit 101 performs a process of analyzing and discriminating information related to the image format of the image and audio information file read out in step S601. Specifically, the information described in the information relating to the image format recorded together with the recording of the image / audio information file may be analyzed. The information is described in the header, playlist, clip information file, etc. in the stream as described above. As a result of the discrimination processing in step S602, if the read stream is an interlaced image of 60 fields / second, no image conversion processing is performed. If it is a progressive image of 24 frames / second, the process proceeds to step S603, and the image conversion unit 105 Conversion processing is performed from a progressive image of 24 frames / second to an interlaced image of 60 fields / second. If the conversion to an interlaced image of 60 fields / second is completed, the subsequent processing is common, and in step S604, predetermined decoding and decompression processing is performed by the encoding / decoding unit 104, and reproduction processing is performed in step S605. Is started.

  Note that the timing of executing the image method discrimination processing in step S602 and the image conversion processing in step S603 is not limited to this. For example, the image method discrimination processing and image conversion after executing the decoding / decompression processing in step S604. Processing may be executed. Further, as described in the description of the recording process, the image conversion unit 105 can be configured to be used for conversion into various image formats, and as an effect, reproduction of image / audio information recorded in various image formats is possible. Is possible.

  In this embodiment, the example of recording / reproducing in the recording / reproducing apparatus has been described. However, the present invention is not limited to this, and is compatible with other recording apparatuses, reproducing apparatuses, or recording / reproducing apparatuses. That is, as shown in the present embodiment, when recording, information related to the image format of the image / sound information is described in a predetermined position such as a stream or a file, and when reproducing, the information is described above. It is possible to ensure compatibility with any recording apparatus, reproducing apparatus, and recording / reproducing apparatus configured to investigate and discriminate information related to the image format and perform reproduction control based on the result.

The recording / reproducing apparatus of the present embodiment can also be used as an image conversion apparatus. For example, when the audio / video information recorded on the optical disc in the recording / reproducing apparatus of this embodiment or another recording apparatus is to be reproduced by another reproducing apparatus, it may be impossible to reproduce. For example, a playback apparatus that does not have a function of examining and discriminating information on the image format, or a playback apparatus that does not have a function of converting a progressive image of 24 frames / second to an interlaced image of 60 fields / second. In such a reproducing apparatus, in order to reproduce the image / audio information recorded as a progressive image of 24 frames / second, the recording / reproducing apparatus of the present embodiment converts it into an interlaced image of 60 fields / second and records it. By revising, it becomes possible to have compatibility with more playback devices.
The above is an example of the method for reproducing the audio / video information in the recording / reproducing apparatus of the present embodiment.

Next, an example of an image conversion method executed by the image conversion unit 105 in this embodiment will be described with reference to FIG.
FIG. 7A shows an example of conversion from a progressive image of 24 frames / second shown in 701-a to an interlaced image of 60 fields / second shown in 702-a. A progressive image of 24 frames / second is composed of 24 frames (ie, a frame) per second, whereas an interlaced image of 60 fields / second is composed of 30 frames per second. Therefore, as shown in Fig.7-a, the first frame of 24 frames / second progressive image is converted to 2 fields, the next frame is converted to 3 fields, and the following 2 fields, 3 fields, etc. are converted. By repeating the above, conversion from a progressive image of 24 frames / second to an interlaced image of 60 fields / second is realized. In such conversion, in response to an instruction from the user, an image captured at a progressive rate of 24 frames / second is recorded as an interlaced image at 60 fields / second, or an image recorded at a progressive rate of 24 frames / second is recorded at 60 fields / second. Or when converting to an interlaced image.

  FIG. 7B shows an example of conversion from the 60 field / second interlaced image shown in 701-b to the 24 frame / second progressive image shown in 702-b in the reverse conversion process of FIG. 7A. ing. One frame is created from the first two fields, one frame is created from the next three fields, and the following two fields, three fields,... Are repeatedly converted. In such conversion, in response to an instruction from the user, an image captured at a progressive rate of 24 frames / second is reproduced as an interlaced image of 60 fields / second, or an image recorded at an interlace of 60 fields / second is reproduced at 24 frames / second. This is done when converting to progressive images.

  The above is an example of the image conversion method in the present embodiment. The image conversion method is called a 2-3 pull-down method. The image conversion method in the present embodiment is not limited to the 2-3 pull down method, and any image conversion method can be applied as long as it converts to a desired image format.

  In the present embodiment, the recording medium has been described by taking an optical disk as an example. However, the present invention is not limited to this and can be applied to various recording media such as a semiconductor memory and a magnetic disk.

  According to the embodiment of the present invention described above, there is an effect that an image having a good resolution can be obtained by capturing an image at a progressive rate of 24 frames / second and recording it on a recording medium.

  Further, in movie shooting, which is currently mainstream recording on a film, the recording / reproducing apparatus of this embodiment may become mainstream in the future.

  In addition, it is possible to select an image method at the time of recording, and since it is possible to perform image conversion of recorded image / audio information, there is an effect that compatibility with other playback devices can be ensured.

  Furthermore, the image and sound recorded on the recording medium at the time of reproduction by the recording / reproducing apparatus of the present embodiment or at the time of reproduction by another reproducing apparatus by means for recording information relating to the image format and means for discriminating the information. There is an effect that reproduction according to the information image system can be performed. Furthermore, a progressive image of 24 frames / second has an effect of improving the encoding efficiency and the sensitivity of a sensor that captures an image, compared to an interlaced image of 60 fields / second.

  Further, although the present embodiment has been described on the premise of a video signal system of NTSC (National Television System Committee), the same effect can be obtained even with a PAL (Phase Alternating Line) system.

Block diagram of recording / playback device The figure which shows the directory structure of the image audio information recorded on an optical disk The figure which shows the example which selects an image system in a recording mode selection menu It is a flowchart which shows the process in the case of recording, The figure which shows the flowchart which shows the example converted into 60I after encoding 24P especially It is a flowchart which shows the process at the time of recording, and is a figure which shows the flowchart which shows the example encoded after converting 24P into 60I especially Flow chart showing processing during playback The figure which shows the conversion method from 24P to 60I, and the conversion method from 60I to 24P

Explanation of symbols

101 System control unit 102 User I / F
103 Input Unit 104 Encoding / Decoding Unit 105 Image Conversion Unit 106 RAM
107 drive control unit 108 optical disc 109 output unit

Claims (7)

In a recording / reproducing apparatus for recording image / audio information on a recording medium and reproducing the image / audio information recorded on the recording medium,
A recording / reproducing apparatus, wherein when recording the image / audio information, the image information is recorded as a progressive image of 24 frames / second. The recording / reproducing apparatus according to claim 1,
A recording / reproducing apparatus that performs predetermined image conversion in accordance with an image method designated by a user when recording the image / audio information. The recording / reproducing apparatus according to claim 1 or 2,
It is possible to convert the image format of the image and sound information recorded on the recording medium according to the image format designated by the user,
A reproducing apparatus for recording the converted audio / video information on a recording medium. The recording / reproducing apparatus according to claim 2 or 3,
A recording / reproducing apparatus configured to be able to convert to one or more image formats when converting the image format. In the recording / reproducing apparatus of Claims 1-4,
A recording / reproducing apparatus for recording confirmation information indicating in what image format the image / audio information is recorded in the image / audio information or in a recording medium when the image / audio information is recorded. . The recording / reproducing apparatus according to claim 5,
When reproducing the image / audio information from a recording medium, the recording / reproducing apparatus reads the confirmation information and reproduces the image / audio information based on the read confirmation information. A recording method for recording image / audio information on a recording medium,
Capture 24 frames / second progressive image as the audio / video information,
A recording method comprising: encoding and compressing and recording an image system that incorporates the progressive image.

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