摘要:
The invention relates to a method for the reproduction of coded pictures. On a video CD, the video data for the PAL system are stored with a resolution of 352 * 288 pixels at a frame frequency of 25 Hz. The video data for still pictures can be stored either with this resolution or with an increased resolution of 704 * 576 for the PAL system. Consequently, depending on the specification, for still pictures on a video CD, there may also be a data stream having a mixed resolution in addition to a data stream having a standard resolution. According to the invention, a preliminary analysis is carried out in a first step. After the identification of pictures NRes having the first resolution, these pictures are either skipped or their contents are stored in a buffer. After the identification of pictures HRes having the second resolution, these are fed to a decoding stage. In the absence of pictures HRes having the second resolution, a jump is made back to the beginning of a picture NRes having the first resolution or the data are read from a buffer and fed to a decoding stage.
摘要:
In such an apparatus including a large display area and a comparatively small camera area the camera produces a picture with a wrong perspective if the object to be picked-up moves to a border of the display area, for example a side view instead of a front view of a speaker directly looking to the display area. It is an object to provide such an apparatus avoiding said drawback and enabling pick-up of the object by the camera area with correct perspective wherever the object is situated in front of the display area. The camera area and the display area are positioned one behind the other and have the same dimensions. Particularly a camera plate (6) and a display plate (7) are displaced in direction of the optical axis one plate including translucent areas enabling transmission of light from the object (12) to be picked-up to the camera plate (6) or of backlight (10) to a display plate (7) including LCD cells. An advantageous field of application is teleconferencing or videophone equipments working with large display screens.
摘要:
The present invention relates to a method and an apparatus for compensating deteriorations and defects in data streams obtained from optical recording media. According to the invention, a method for bit recovery in an asymmetric data channel, whereby the data are demodulated by a demodulator, comprises the steps of: - detecting runlength violations prior to the demodulation of a runlength limited code, and - correcting the detected runlength violations prior to the demodulation.
摘要:
Compression parameter sets are stored in files separate from the main AV or transmitted separately and prior to any subsequent transmission of AV data. The scope of parameter set identifiers is limited to not more than a Program Chain. Either existing files are extended by including the compression parameter sets directly, or separate files containing the compression parameter sets are created. In order to support easy authoring of compound content, it is proposed to amend each compression parameter set or groups of such parameter sets with scope period information, which can be based on time stamps, on file names, or on sector numbers on the disc. It is additionally proposed to employ an indirect referencing mechanism, where parameter set identifiers are referring to secondary tables, and where the entries of secondary tables are defined to be themselves identifiers referring in turn to entries of a common parameter set table provided once.
摘要:
It is desired to link photo data and video data taken by a digital camcorder (200). Therefore, there is provided a device and method for linking multimedia data, wherein linking information is formed (209) on the basis of first and/or second multimedia data. The linking information is stored (210) on a recording medium (202) together with the first multimedia data (201). The second multimedia data may be stored (206) together with respective linking information (211) to the first multimedia data on a second recording medium (207). Thus, a camera-man while recording is able to set up logo or index pictures for a video film.
摘要:
The invention proposes a method for reverse playback of a digital data stream representing video information. The information is stored in an Intra picture coded format followed by several Non - Intra coded pictures. For reverse playback n sectors are jumped back from the actual scanning position. The location of the n sectors is read in forward direction. A sector location list is created. The sector location list is resorted to a reverse order. The position of sector stream is parsed according to the sector location list in order to find appropriate position of start codes of the video information. Digital data stream from position of start codes is delivered to a following processing unit.
摘要:
A method for modifying data read from read-only media during playback time comprises logically merging the on-disc directory tree and an associated off-disc directory tree. A logical directory tree (L_DT) is constructed from the data retrieved from the read-only medium, wherein the structure of the logical directory tree is identical with the structure of the directory tree (D_DT) of the medium. The method allows replacing content on the disc through downloaded content, e.g. replacing an out-dated trailer stored on the disc through a downloaded trailer for a new movie. The method further allows complementing or upgrading content on the disc, e.g. by downloading a new subtitle track from the internet.
摘要:
Subtitling aims at the presentation of text information and graphical data, encoded as pixel bitmaps. The size of subtitle bitmaps may exceed video frame dimensions, so that only portions are displayed at a time. The bitmaps are a separate layer lying above the video, e.g. for synchronized video subtitles, animations and navigation menus, and therefore contain many transparent pixels. An advanced adaptation for bitmap encoding for HDTV, e.g. 1920x1280 pixels per frame as defined for the Blu-ray Disc Prerecorded format, providing optimized compression results for such subtitling bitmaps, is achieved by a four-stage run length encoding. Shorter or longer sequences of pixels of a preferred color, e.g. transparent, are encoded using the second or third shortest code words, while single pixels of different color are encoded using the shortest code words, and sequences of pixels of equal color use the third or fourth shortest code words.
摘要:
Networks, particularly home networks, may be implemented using peer-to-peer technology. To relieve the user from administrative tasks, some configuration routines for such networks may be automated. Therefore a peer-group (OZ_20,OZ_21) selects one of its peers as negotiation peer (N21,N23), having the task to communicate with single other peers or negotiation peers from other peer-groups. When adding or removing single peers, or merging or splitting peer-groups, the group label (Z_ID A ,Z_ID B ) is usually modified. But it may be advantageous to keep the group label, especially if that label is known to other peer-groups. If a new peer-group in a peer-to-peer network is created by merging or splitting other peer-groups, a method for selecting a group label for the new peer-group comprises determining a negotiation peer, exchanging information between the negotiation peers in the case of merging, comparing features of the two peer-groups and based on the comparison assigning the label (Z_ID B ) of one of the peer-groups to the new peer-group (OZ_2).
摘要:
The invention relates to assigning a first absolute time value to an entry point, the entry point being located at a first position in a data stream sequence, the data stream having data packets with relative time stamps. A second absolute time value is provided for a second position of the data stream sequence. The absolute time value is determined for the entry point based on the second absolute time value and the relative time stamps of data packets between the first and second positions.