Method and apparatus for reducing the amount of data required to
represent a video frame
    4.
    发明授权
    Method and apparatus for reducing the amount of data required to represent a video frame 失效
    用于减少表示视频帧所需的数据量的方法和装置

    公开(公告)号:US5592299A

    公开(公告)日:1997-01-07

    申请号:US311811

    申请日:1994-09-26

    摘要: Methods and apparatus for processing digital video data to reduce the amount of video data required to represent a video frame by representing a frame or pair of field pictures into a single field of a pair of field picture are described. To prevent the second field of the field picture from being displayed a DSM byte associated with the field picture is set so that only the field representing the video frame is displayed. In accordance with the present invention, a field, e.g., a transparent predictively coded field is used as the field picture which is not displayed. In this manner, very little data is required to represent the field picture that is not displayed. When the received frames are represented as pairs of field pictures a single field of the pair of field pictures is selected to represent the video frame with the other field picture being replaced with a field which requires very little data. When frame pictures are received one of a plurality of numerous described methods of mapping frame pictures into a single field of a pair of field pictures are used to convert the frame picture into a single field of a pair of field pictures. A plurality of methods for reducing the amount of data required to represent the single field of the pair of field pictures are also described.

    摘要翻译: 描述了通过将一帧或一对场图像表示成一对场图像的单个场来处理数字视频数据以减少表示视频帧所需的视频数据量的方法和装置。 为了防止场图像的第二场被显示,设置与场图像相关联的DSM字节,使得仅显示表示视频帧的场。 根据本发明,使用例如透明预测编码字段的字段作为不显示的场图像。 以这种方式,需要非常少的数据来表示不显示的场图像。 当接收到的帧被表示为场图像对时,选择一对场图像对中的单个场来表示视频帧,而另一个场图像被替换为需要非常少的数据的场。 当帧图像被接收时,将帧图像映射到一对场图像的单个场中的多种众所周知的方法之一用于将帧图像转换成一对场图像的单个场。 还描述了用于减少表示一对场图像的单个场所需的数据量的多种方法。

    Noise reduction in frame transmitted video signals
    7.
    发明授权
    Noise reduction in frame transmitted video signals 失效
    帧传输视频信号中的噪声减少

    公开(公告)号:US5208673A

    公开(公告)日:1993-05-04

    申请号:US788026

    申请日:1991-11-05

    申请人: Jill M. Boyce

    发明人: Jill M. Boyce

    IPC分类号: G06T5/00 H04N5/21 H04N7/26

    摘要: A method for reducing noise in a reference frame of video information by determining the mean absolute difference, MAD.sub.o, between each block in the reference frame and identically located blocks in adjacent frames. If MAD.sub.o is A, a search is made for a block in the adjacent frame that matches the block in the reference frame. This is labelled MAD.sub.min. If MAD.sub.o for the block in the adjacent frame is

    摘要翻译: 一种通过确定参考帧中的每个块和相邻帧之间的相同位置的块之间的平均绝对差MADo来减少视频信息的参考帧中的噪声的方法。 如果MADo为 A,则搜索与块中的块相匹配的相邻帧中的块 参考框架。 这被标记为MADmin。 如果相邻帧中的块的MADo为

    Complete user datagram protocol (CUDP) for wireless multimedia packet networks using improved packet level forward error correction (FEC) coding

    公开(公告)号:US07151754B1

    公开(公告)日:2006-12-19

    申请号:US09668242

    申请日:2000-09-22

    IPC分类号: H04Q7/00

    摘要: A complete User Datagram Protocol (CUDP) is disclosed that reduces packet loss. Channel frame error information is used with a packet level forward error correction (FEC) coding technique to accommodate wireless multimedia traffic. Each packet, as well as the channel frame error information, is forwarded to a given application. The CUDP protocol further assists the FEC decoding process by forwarding the locations of corrupted frames to the FEC decoder. Maximal Distance Separable (MDS) codes can be applied to a group of packets, to achieve additional robustness. An MDS decoder utilizes the frame error information to recognize the erasures within each packet. The error information can be represented as a set of LTU error indicators associated with each packet (for FEC decoders requiring an erasure indicator). The error indicators point to the starting and ending location of the erroneous data. The error information can also be represented as a reformatted packet (for FEC decoders Recognizing Erasures). The frame (LTU) error information from the lower layers is incorporated in the packet payload. An FEC encoder is also disclosed that encodes multimedia packets utilizing a packet-coding scheme, such as a Vertical Packet Coding (VPC) scheme or a Long Vertical Packet Coding (LVPC) scheme.