JP2004295143A - Video output device, video output method, video transmission device, and video transmission method - Google Patents

Abstract

An object of the present invention is to provide a display with good quality according to a situation by using a plurality of display methods using digital video data conforming to one standard.
A video data control unit sets identification information indicating a display method in synchronization information of digital video data and outputs digital video data in which the identification information is set, so that the video data is transferred through one data transfer path. An image can be displayed using a plurality of display methods by digital image data conforming to one standard.
[Selection diagram] Fig. 1

Description

  The present invention relates to a video output device, a video output method, a video transmission device, and a video transmission method that handle digital video data transferred to a display device or a system having a display control function.

  Generally, in a video display device, a display method is specified by digital video data to be handled. For example, when digital video data conforming to the standard of ITU-R656 (International Telecommunication Union Recommendation No. 656) "INTERFACES FOR DIGITAL VIDEO SIGNALS IN 525-LINE AND 625-LINE TELEVISION SYSTEMS" is used, the video is interlaced. Is displayed.

  FIG. 4 shows a partial configuration of digital video data in the above-described standard. In the data for one scanning line, in addition to the active video data actually used, a synchronization code indicating the start and end of the active video data and blanking data are embedded.

  The synchronization code is composed of 4 bytes, and the first to third bytes are fixed at “FFh 00h 00h”, and the fourth byte is as shown in FIG. The most significant bit (bit 7) in the byte shown in FIG. 4 is fixed at "1".

  The interlace method is a method of sequentially displaying odd-numbered field scanning lines and then displaying even-numbered field scanning lines, or sequentially displaying even-numbered field scanning lines and then displaying odd-numbered field scanning lines. Every other day. The interlace method has a feature of reducing flicker when displaying a moving image, but when displaying a video using a high-definition or high-resolution display device, the roughness of the video is conspicuous. I will.

  On the other hand, as a display method for performing high-quality display using a high-definition or high-resolution display device, there is a progressive scan method in which scanning lines are sequentially scanned from top to bottom. When displaying an image using the progressive scan method, it is necessary to perform data transfer using digital image data for the progressive scan method which is different from the above-described standard.

  As described above, in the conventional video display device, the display system is determined by the digital video data to be handled. Therefore, even if a high-definition or high-resolution display device suitable for the progressive scan system is used, the above-described ITU- In the case of handling digital video data conforming to the standard of R656 (International Telecommunication Union Recommendation No. 656), only an interlaced display was possible.

  In addition, since the display method is determined by the digital video data to be handled, only the video display using the same display method can be performed regardless of the content of the video material.

  The present invention has been made in view of the above circumstances, and a video output device and a video output device capable of performing display with good quality according to a situation using a plurality of display methods using digital video data conforming to one standard. An object is to provide an output method, a video transmission device, and a video transmission method.

  The present invention includes means for setting identification information indicating a display method in synchronization information of digital video data, and means for outputting digital video data in which the identification information is set.

  As described above in detail, according to the present invention, identification information indicating a display method is set and transmitted in digital video data, and the display method is switched based on the identification information set in the transmitted digital transmission data. Since the video is displayed, it is possible to display the video using a plurality of display methods using digital video data that is transferred by one data transfer path and conforms to one standard.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the system configuration of the video display device according to the present embodiment. The video display device according to the present embodiment is realized by a computer that reads a program recorded on a recording medium such as a CD-ROM, a DVD, and a magnetic disk, and whose operation is controlled by the program.

  As shown in FIG. 1, the video display device according to the present embodiment includes a video data control unit 10, a system control unit 11, an input device 12, a display control unit 14, and a display device 15.

  The video data control unit 10 handles digital video data read from a medium under the control of the system control unit 11, and includes a read control unit 10a and a transmission control unit 10b.

  The read control unit 10a reads digital data recorded on the medium 20 (for example, a DVD-ROM), decodes the digital data into video data, and provides the video data to the transmission control unit 10b.

  The transmission control unit 10b adds identification information (identification data) indicating a display method to video data read from the medium 20 and decoded by the read control unit 10a, and transmits the video data to the display control unit 14. Then, based on the information provided from the system control unit 11, the video data from the read control unit 10a is converted into video data according to the display mode, and identification data indicating the display mode is added to the display control unit 14 to add the identification data. Give to. In the video display device according to the present embodiment, it is assumed that an interlace method and a progressive scan method are used as display methods.

  The system control unit 11 is responsible for controlling the video display device. The system control unit 11 provides information for accessing the medium 20 to the reading control unit 10a based on information input from the input device 12, and controls transmission control. Information for selecting which display method to use is given to the unit 10b.

  The input device 12 is configured by a remote controller, a keyboard, and the like, and inputs an instruction for controlling the operation of the video display device to the system control unit 11. For example, the input device 12 instructs the video data control unit 10 to perform video data processing. That is, it is used for inputting an instruction as to whether to use the interlace method or the progressive scan method as the display method.

  The display control unit 14 receives the digital transmission data transmitted from the transmission control unit 10b of the video data control unit 10, and displays the digital video data based on the identification information (identification data) included in the digital video data. The image is displayed on the display device 15 by switching the progressive scan method).

  The display device 15 is configured by a CRT or an LCD, and displays an image or the like under the control of the display control unit 14.

  FIG. 2 is a diagram showing a data format of digital video data handled in the video display device according to the present invention shown in FIG. The digital video data shown in FIG. 2 is digital video data according to the standard of ITU-R656 (International Telecommunication Union Recommendation No. 656) "INTERFACES FOR DIGITAL VIDEO SIGNALS IN 525-LINE AND 625-LINE TELEVISION SYSTEMS".

  FIG. 2 shows a data format for one scanning line. A synchronization code is added to each of the start and end of the video data, and identification information (identification data T) indicating a display method is provided in the fourth byte of the code.

  FIG. 3 shows the fourth byte of the synchronization code. The most significant bit (bit 7) in the byte shown in FIG. 3 is fixed data that has no meaning in the standard. However, in the present embodiment, the most significant bit (bit 7) is handled as identification data T in the standard of the digital video data. To switch between two different display methods. In the present embodiment, when the value of the identification data T is “1”, the interlace method is indicated, and when the value of T is “0”, the progressive scan method is indicated.

  Next, the operation in the present embodiment will be described.

  In FIG. 1, a medium 20 is, for example, a DVD-ROM, on which digital data of a video signal such as a movie is recorded.

  The system control unit 11 supplies information for accessing the medium 20 to the read control unit 10a based on the information provided from the input device 12, and selects any one of an interlace system and a progressive scan system. Is given to the transmission control unit 10b.

  The read control unit 10a accesses the medium 20 based on the information provided from the system control unit 11, and reads the encoded digital data recorded on the medium 20. Further, the reading control unit 10a decodes the digital data read from the medium 20 into video data and supplies the video data to the transmission control unit 10b.

  The transmission control unit 10b converts the video data supplied from the reading control unit 10a into video data of either an interlace system or a progressive scan system based on information provided from the system control unit 11. In addition, the transmission control unit 10b converts the identification data T indicating the interlace method or the progressive scan method according to which display method is used (depending on which display method has been converted to video data). It is added to the synchronization code and given to the display control unit 14.

  That is, when the video data is converted to interlaced video data, the value of the most significant bit of the fourth byte of the synchronization code shown in FIGS. 2 and 3 is set to “1” and converted to progressive scan video data. Is performed, the value of the most significant bit is set to “0”.

  When receiving the video data from the transmission control unit 10b, the display control unit 14 refers to the identification data T in the synchronization code included in the video data, and determines whether the display mode is the interlace mode or the progressive scan mode. Is determined.

  The display control unit 14 switches the output format of the video data based on the determination result and causes the display device 15 to display the output format.

  In this way, data that has been conventionally treated as fixed data and has no meaning in the standard is treated as identification data T indicating the interlace system or the progressive scan system, whereby one digital video data conforming to the standard can be used. It is possible to switch the display method. Therefore, even if two different display methods are used, only one data transfer path is required.

  When a single video material (such as a movie) is displayed, the video may be displayed using one of the interlace method and the progressive scan method. After the display method is determined based on the value set in the identification data included in the (for example, the first) synchronization code, the identification data T set in each synchronization code is not determined. Is also good.

  When the video material includes different types of contents, the transmission control unit 10b determines the value set in the identification data included in each synchronization code, and determines when the value of the identification data changes. The display method may be dynamically changed.

  For example, if the video material includes an image shot by an interlaced camera and an image shot by a progressive scan camera, the same display method as that used at the time of shooting is used. In this case, it is possible to display an image in accordance with the quality that should originally exist.

  Therefore, when video data suitable for different display methods are mixed, identification data T indicating a display method corresponding to each of the display data is added to a synchronization code that is continuous with the corresponding video data. The display system can be dynamically switched according to the value of the identification data T by using the display device 14, and can be displayed using the display system suitable for the video material.

  When the ITU-R656 standard is used for the digital TV, the display method can be switched as described above by applying the present invention.

  Note that the method described in the above-described embodiment can be executed on a recording medium such as a magnetic disk (such as a flexible disk or a hard disk), an optical disk (such as a CD-ROM or a DVD), or a semiconductor memory as a program that can be executed by a computer. It can be written and provided to various devices. In addition, it is also possible to transmit the data via a communication medium and provide it to various devices. The computer that realizes the present apparatus reads the program recorded on the recording medium or receives the program via the communication medium, and executes the above-described processing by controlling the operation of the program.

FIG. 1 is a block diagram showing a system configuration of a video display device according to the embodiment. FIG. 2 is a diagram showing a data format of digital video data handled in the video display device according to the present invention shown in FIG. 1. The figure which shows the 4th byte of a synchronous code. FIG. 3 is a diagram showing a partial configuration of conventional digital video data.

Explanation of reference numerals

  10: video data control unit, 10a: read control unit, 10b: transmission control unit, 11: system control unit, 12: input device, 14: display control unit, 15: display device.

Claims (10)

Means for setting identification information indicating a display method in synchronization information of digital video data,
A video output device having means for outputting digital video data in which the identification information is set.   The video output device according to claim 1, wherein the synchronization information is provided in a data format of the digital video data. Means for adding identification information indicating a field display method to the digital video data,
A video output device having means for outputting digital video data to which the identification information has been added.   The video output device according to claim 1, wherein the identification information indicates an interlace method or a progressive scan method. Set identification information indicating the display method in the synchronization information of the digital video data,
A video output method for outputting digital video data in which the identification information is set. Add identification information indicating the display method of the field to the digital video data,
A video output method for outputting digital video data to which the identification information has been added. Means for setting identification information indicating the display method of the display device to the synchronization information of the digital video data,
An image transmission device, comprising: means for transmitting digital image data in which the identification information is set to the display device. Means for adding identification information indicating a display method of a field displayed by the display device to the digital video data,
An image transmitting device, comprising: means for transmitting digital image data to which the identification information has been added to the display device. Set identification information indicating the display method of the display device in the synchronization information of the digital video data,
A video transmission method for transmitting digital video data in which the identification information is set to the display device. Adding identification information indicating a display method of a field displayed by the display device to the digital video data,
A video transmission method for transmitting digital video data to which the identification information has been added to the display device.

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