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96 条记录 (耗时 0.024 秒)

    Variable length coding apparatus and method for motion vector
    92.
    发明授权
    Variable length coding apparatus and method for motion vector 失效
    可变长度编码装置及运动矢量方法

    公开(公告)号：US5298991A

    公开(公告)日：1994-03-29

    申请号：US918010

    申请日：1992-07-24

    申请人： Yoichi Yagasaki ,  Jun Yonemitsu ,  Veltman Mark ,  Kaisuji Igarashi

    发明人： Yoichi Yagasaki ,  Jun Yonemitsu ,  Veltman Mark ,  Kaisuji Igarashi

    IPC分类号： H04N7/32 ,  H03M7/30 ,  H04N7/26 ,  H04N7/30 ,  H04N7/36 ,  H04N7/50 ,  H04N7/157

    CPC分类号： H04N19/517 ,  H04N19/51 ,  H04N19/61 ,  H04N19/13 ,  H04N19/91

    摘要： A ROM containing a variable length coding table for a 2 picture element range is provided. A motion vector within the range of 2 picture elements is provided to the ROM to produce a VLC code corresponding to the motion vector within the range of 2 picture elements. In a calculation circuit, assuming that the value of a motion vector within the range of 4 picture elements is X, a quotient Y and a remainder Z are obtained by the division of X by 2. The quotient Y is supplied to the ROM and the output of the ROM is added the remainder Z at an addition circuit to obtain a VLC code corresponding to the motion vector lying within the range of 4 picture elements. This is equivalent to variable length coding for a 4 picture element range. By transmitting a flag indicating whether the motion vector range is 2 picture elements or 4 picture elements, the motion vector is correctly reproduced from the VLC code. Accordingly motion vectors within the ranges of 2 picture elements and 4 picture elements can be coded using a single ROM table so that the hardware requirements are reduced.

    摘要翻译： 提供了包含2个像素范围的可变长度编码表的ROM。 将两个图像元素范围内的运动矢量提供给ROM，以产生对应于2个图像元素范围内的运动矢量的VLC代码。 在计算电路中，假设在4个图像元素的范围内的运动矢量的值为X，则通过将X除以2获得商Y和余数Z。商Y被提供给ROM，并且 ROM的输出在加法电路中加上余数Z，以获得与4象素范围内的运动矢量对应的VLC码。 这相当于4像素范围的可变长度编码。 通过发送指示运动矢量范围是2个像素还是4个图像元素的标志，从VLC代码正确地再现运动矢量。 因此，可以使用单个ROM表来对2个图像元素和4个图像元素的范围内的运动矢量进行编码，从而降低硬件要求。

    Recording/reproducing compressed data on a rotatable record medium in which at least one intraframe code signal and at least (n-1) interframe code signals are recorded in each track
    94.
    发明授权
    Recording/reproducing compressed data on a rotatable record medium in which at least one intraframe code signal and at least (n-1) interframe code signals are recorded in each track 失效
    在可旋转记录介质上记录/再现压缩数据，其中至少一个帧内码信号和至少（n-1）个帧间码信号被记录在每个轨道中

    公开(公告)号：US5140437A

    公开(公告)日：1992-08-18

    申请号：US509493

    申请日：1990-04-16

    申请人： Jun Yonemitsu ,  Yoichi Yagasaki

    发明人： Jun Yonemitsu ,  Yoichi Yagasaki

    IPC分类号： H04N5/92 ,  G06T9/00 ,  G11B20/12 ,  G11B21/08 ,  G11B27/00 ,  G11B27/034 ,  G11B27/10 ,  G11B27/30 ,  H04N5/783 ,  H04N5/85 ,  H04N5/926 ,  H04N7/36

    CPC分类号： H04N19/503 ,  G11B21/081 ,  G11B27/005 ,  G11B27/034 ,  G11B27/105 ,  H04N5/9261 ,  H04N5/9262 ,  H04N5/9264 ,  G11B2220/20 ,  G11B2220/213 ,  G11B2220/2545 ,  G11B27/3027 ,  H04N5/783 ,  H04N5/85

    摘要： Image data is recorded in successive turns on a rotatable record medium driven at substantially constant linear velocity by converting a first of successive image frames of image data to an intraframe code signal, converting the (n-1) next-following frames to (n-1) interframe code signals, and recording the intraframe and (n-1 ) interframe code signals on the record medium. In one embodiment, n is the maximum number of image frames that can be recorded in the innermost turn of the record medium and n is constant for all turns, whereby the same number (n--1 ) of interframe code signals separate successive intraframe code signals from turn to turn. In another embodiment, n is a variable and increases as the radius of the turn in which the code signals are recorded increases, whereby a larger number (n-1) of interframe code signals separate successive intraframe code signals as the turn radius increases. The recorded image data is recovered by reproducing the recorded intraframe and interframe code signals and selectively coupling the reproduced code signals to an intraframe decoder or to an interframe decoder as a function of whether intraframe or interframe code signals are reproduced.

    摘要翻译： 通过将图像数据的连续图像帧中的第一个图像数据转换为帧内码信号，将基本上恒定的线速度驱动的可旋转记录介质上的图像数据连续记录，将（n-1）个后续帧转换为（n- 1）帧间码信号，并在记录介质上记录帧内和（n-1）帧间码信号。 在一个实施例中，n是可以在记录介质的最内圈中记录的图像帧的最大数量，并且对于所有匝数，n是恒定的，由此相同数量的（n-1）个帧间码信号将连续的帧内码信号 从转到转。 在另一个实施例中，n是可变的并且随着其中记录码信号的转弯半径的增加而增加，由此当转弯半径增加时，大量（n-1）个帧间码信号分离连续的帧内码信号。 通过再现记录的帧内和帧间码信号来恢复所记录的图像数据，并且根据是否再现帧内或帧间码信号，有选择地将再现的码信号耦合到帧内解码器或帧间解码器。