JP4489093B2 - Video output device and video output method - Google Patents

Description

  The present invention relates to a video output device and a video output method for handling 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 handling 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”, the video is interlaced. Is displayed.

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

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

  The interlace method is a method in which even-numbered field scanning lines are displayed after sequential display of odd-numbered scanning lines, or odd-numbered field scanning lines are displayed after sequential display of even-numbered scanning lines. It is done every other time. The interlace method has the feature of reducing flicker when displaying a moving image. However, when the image is displayed using a high-definition or high-resolution display device, the roughness of the image is conspicuous. End up.

  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 video is displayed using the progressive scan method, it is necessary to transfer data using digital video data for the progressive scan method different from the standard described above.

  As described above, in the conventional video display device, since the display method is determined by the digital video data to be handled, for example, even if a high-definition or high-resolution display device suitable for the progressive scan method is used, the above-mentioned ITU- When digital video data complying with the standard of R656 (International Telecommunication Union Recommendation No. 656) is handled, only the display by the interlace method can be performed.

  Further, 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 contents of the video material.

  The present invention has been made in consideration of the above-mentioned circumstances, and can display images with good quality according to the situation by using a display method of an interlace method or a progressive scan method with digital video data according to one standard. An object of the present invention is to provide a video output device and a video output method.

  According to the present invention, means for decoding video into digital data including digitally encoded data, and identification information indicating an interlace method or a progressive scan method are inserted into a predetermined byte together with the decoded digital data. Means for setting the fixed length information in the data format of the digital data, and means for outputting the digital data together with the fixed length information.

  As described above in detail, according to the present invention, the identification information indicating the interlace method or the progressive scan method indicating the display method is set and transmitted in the digital video data, and the identification set in the transmitted digital transmission data is transmitted. Since the video is displayed by switching the display method based on the information, the video can be displayed by using the display method of the interlace method or the progressive scan method by the digital video data according to one standard transferred through one data transfer path. Can be performed.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a system configuration of a video display apparatus according to this embodiment. The video display apparatus 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, or a magnetic disk and whose operation is controlled by the program.

  As shown in FIG. 1, the video display device according to this 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 is provided with 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 supplies the video data to the transmission control unit 10b.

  The transmission control unit 10b adds identification information (identification data) indicating a display method to the 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. Thus, based on the information given from the system control unit 11, the video data from the reading control unit 10a is converted into video data corresponding to the display method, and identification data indicating the display method is added to the display control unit 14 Give to. In the video display apparatus of the present embodiment, an interlace method and a progressive scan method are used as display methods.

  The system control unit 11 controls the video display device. Based on information input from the input device 12, the system control unit 11 provides information for accessing the medium 20 to the reading control unit 10a and performs 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, an instruction for video data processing in the video data control unit 10 In other words, it is used to input an instruction as to whether to use an interlace method or a progressive scan method as a 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 a display method (interlace method or identification data) based on identification information (identification data) included in the digital video data. The progressive scanning system) is switched and the display device 15 displays the video.

  The display device 15 is configured by a CRT or LCD, and displays images and 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 apparatus 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 video data, and identification information (identification data T) indicating a display method is provided in the most significant bit of 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. In the present embodiment, the most significant bit (bit 7) is handled as identification data T, and thus is included in the standard of digital video data. 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 conversely, when the value of T is “0”, the progressive scan method is indicated.

  Next, the operation in this embodiment will be described.

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

  The system control unit 11 gives information for accessing the medium 20 to the reading control unit 10a based on the information given from the input device 12, and selects either the interlace method or the progressive scan method. Is given to the transmission control unit 10b.

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

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

  That is, when converted to interlace video data, the value of the most significant bit of the 4th byte of the synchronization code shown in FIGS. 2 and 3 is set to “1”, and converted to progressive scan video data. When the above is performed, the value of the most significant bit is set to “0”.

  When the display control unit 14 receives 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 method is the interlace method or the progressive scan method. 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 it.

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

  When there is a single video material (such as a movie), one of the display methods of the interlace method or the progressive scan method may be used when displaying the image. 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 discriminated. Also good.

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

  For example, if there are video shot with an interlaced camera and video shot with a progressive scan camera in the video material, the same display method used for shooting is used. When the images are displayed, the images can be displayed with the quality that should be originally obtained.

  Accordingly, when video data suitable for different display methods is mixed, the display control unit adds identification data T indicating the display method corresponding to each to a synchronization code continuous with the corresponding video data. 14, the display method can be dynamically switched according to the value of the identification data T, and the display method can be displayed using the display method suitable for the video material.

  Further, when the ITU-R656 standard is used for digital TV, the present invention can be applied to switch the display method as described above.

  The method described in the above-described embodiment is a program that can be executed by a computer, for example, on a recording medium such as a magnetic disk (flexible disk, hard disk, etc.), an optical disk (CD-ROM, DVD, etc.), or a semiconductor memory. It can be written and provided to various devices. It is also possible to transmit to a variety of devices by transmitting via a communication medium. A computer that implements this apparatus reads the program recorded on the recording medium or receives the program via the communication medium, and the operation is controlled by this program, thereby executing the above-described processing.

1 is a block diagram showing a system configuration of a video display apparatus according to an embodiment. The figure which shows the data format of the digital video data handled in the video display apparatus by this invention shown in FIG. The figure which shows the 4th byte of a synchronous code. The figure which shows the partial structure of the conventional digital video data.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Video data control part, 10a ... Reading control part, 10b ... Transmission control part, 11 ... System control part, 12 ... Input device, 14 ... Display control part, 15 ... Display apparatus.

Claims (2)

Means for decoding video into digital data including digitally encoded data;
Means for setting, in the data format of the digital data, fixed-length information in which identification information indicating an interlace method or a progressive scan method is inserted in a predetermined byte together with the decoded digital data;
A video output device comprising means for outputting the digital data together with the fixed length information. Video is decoded into digital data including digitally encoded data,
Along with this decoded digital data, fixed length information in which identification information indicating an interlace method or a progressive scan method is inserted in a predetermined byte is set in the data format of the digital data,
A video output method for outputting the digital data together with the fixed length information.

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