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11 条记录 (耗时 0.021 秒)

    Bit-rate conversion circuit for a compressed motion video bitstream
    1.
    发明授权
    Bit-rate conversion circuit for a compressed motion video bitstream 失效
    用于压缩运动视频比特流的比特率转换电路

    公开(公告)号：US5754235A

    公开(公告)日：1998-05-19

    申请号：US410490

    申请日：1995-03-24

    申请人： Takashi Urano ,  Koichi Tsuchikane ,  Satoko Kobayashi

    发明人： Takashi Urano ,  Koichi Tsuchikane ,  Satoko Kobayashi

    IPC分类号： G06T9/00 ,  H04N7/26 ,  H04N11/02

    CPC分类号： H04N19/40

    摘要： An input bitstream (a first bitstream) is divided into a main code having a changeable length and the remaining data. The main code is subjected to a bit-rate conversion and combined with the remainig data to output a second bitstream. By this arrangement, the configuration ofthe bit-rate conversion circuit can be simplified and delay in the conversion process can be reduced. Incidentally, the main code corresponds to the DCT-coefficient data(e) and the quantizer scale(d), while the remaining data corresponds to the header data(a), the handling type data(b) and the motion vector data(c) respectively. Furthermore, by using the fact that if the quantizer scale is enlarged and the compression rate is raised, the degradation of a reproduced picture with a large DCT-coefficient's value of higher frequency terms is not conspicuous but the degradation of a reproduced picture with a small DCT-coefficient's value of higher frequency terms is conspicuous, and by changing the compression rate based on the DCT-coefficient's value of higher frequency terms, a bitstream with a low bit-rate but a small degradation in the reproduced picture quality can be obtained.

    摘要翻译： 输入比特流（第一比特流）被划分为具有可变长度的主码和剩余数据。 对主码进行比特率转换并与剩余数据组合以输出第二比特流。 通过这种布置，可以简化比特率转换电路的配置，并且可以减少转换处理中的延迟。 顺便提及，主码对应于DCT系数数据（e）和量化器刻度（d），而剩余数据对应于标题数据（a），处理类型数据（b）和运动矢量数据（c ） 分别。 此外，通过使用如果量化器尺度扩大并且压缩率升高的事实，则具有较高频率项的较大DCT系数值的再现图像的劣化不显着，但是具有小的再现图像的劣化 较高频率项的DCT系数的值是显着的，并且通过基于较高频率项的DCT系数的值改变压缩率，可以获得具有低比特率但是再现的图像质量的小的劣化的比特流。

    Motion video coding systems with motion vector detection
    3.
    发明授权
    Motion video coding systems with motion vector detection 失效
    具有运动矢量检测的运动视频编码系统

    公开(公告)号：US5808700A

    公开(公告)日：1998-09-15

    申请号：US825397

    申请日：1997-03-28

    申请人： Etsuko Sugimoto ,  Takashi Urano ,  Satoko Kobayashi ,  Yasuhachi Hamamoto ,  Hideo Kodama

    发明人： Etsuko Sugimoto ,  Takashi Urano ,  Satoko Kobayashi ,  Yasuhachi Hamamoto ,  Hideo Kodama

    IPC分类号： H04N7/26 ,  H04N7/36 ,  H04N7/50

    CPC分类号： H04N19/507 ,  H04N19/43 ,  H04N19/51

    摘要： A motion vector detecting circuit and a motion video compressing system are disclosed. The detecting circuit detect a vector which direct from a spatial location of a current macroblock to a spatial location of a reference macroblock. The detecting circuit includes a first extracting circuit, a second extracting circuit and a searching circuit. The first extracting circuit extracts upper bits from each pixel data of the current macroblock. The second extracting circuit extracts upper bits from each pixel data of the reference frame. The searching circuit searches the upper-bits-extracted reference frame for a macroblock having the strongest correlation with the current macroblock by comparing the upper-bits-extracted current macroblock with the upper-bits-extracted reference frame and outputs the spatial location of the reference macroblock. The motion video compressing system includes the motion vector detecting circuit, a transform-coding circuit, a subtracter, a comparator and a controller. The transform-coding circuit codes inputted data into compressed. The subtracter calculates a difference between each pixel data of the current macroblock and each corresponding pixel data of the reference macroblock directed by the motion vector. The comparator compares an amount of data being obtained by the transform-coding the current macroblock with an amount of data being obtained by the transform-coding the differential macroblock. The controller controls the transform-coding circuit such that the transform-coding circuit outputs which of the compressed current macroblock and the compressed differential macroblock has a smaller amount of data.

    摘要翻译： 公开了运动矢量检测电路和运动视频压缩系统。 检测电路检测从当前宏块的空间位置引导到参考宏块的空间位置的向量。 检测电路包括第一提取电路，第二提取电路和搜索电路。 第一提取电路从当前宏块的每个像素数据中提取高位。 第二提取电路从参考帧的每个像素数据中提取高位。 搜索电路通过将高比特率提取的当前宏块与高位提取的参考帧进行比较，来搜索与比特提取的参考帧中的与当前宏块最相关的宏块，并输出参考的空间位置 宏块。 运动视频压缩系统包括运动矢量检测电路，变换编码电路，减法器，比较器和控制器。 变换编码电路对输入的数据进行压缩编码。 减法器计算当前宏块的每个像素数据和由运动向量指导的参考宏块的每个对应像素数据之间的差。 比较器将通过对当前宏块进行变换编码获得的数据量与通过对差分宏块进行变换编码获得的数据量进行比较。 控制器控制变换编码电路，使得变换编码电路输出压缩的当前宏块和压缩的差分宏块中的哪一个具有较小的数据量。

    Method and apparatus for adaptively selecting a coding mode for video encoding
    5.
    发明授权
    Method and apparatus for adaptively selecting a coding mode for video encoding 失效
    用于自适应地选择用于视频编码的编码模式的方法和装置

    公开(公告)号：US5963673A

    公开(公告)日：1999-10-05

    申请号：US769252

    申请日：1996-12-18

    申请人： Hideo Kodama ,  Takashi Urano ,  Satoko Kobayashi ,  Yasuhachi Hamamoto ,  Etsuko Sugimoto

    发明人： Hideo Kodama ,  Takashi Urano ,  Satoko Kobayashi ,  Yasuhachi Hamamoto ,  Etsuko Sugimoto

    IPC分类号： G06T9/00 ,  H04N7/26 ,  H04N7/46 ,  G06K9/00

    CPC分类号： H04N19/567 ,  H04N19/577

    摘要： A method and apparatus for adaptively selecting a coding mode for video encoding systems using the techniques of predictive coding, interpolative coding, motion compensation, discrete cosine transformation (DCT), adaptive quantization, or variable length coding. In one system, a value related to an amount of total code, which is composed of current video code and its coding parameters for each of the above coding modes, is determined, respectively, and a coding mode corresponding to the smallest value is selected. Then, the encoding is performed using the selected coding mode.

    摘要翻译： 一种用于使用预测编码，内插编码，运动补偿，离散余弦变换（DCT），自适应量化或可变长度编码的技术来自适应地选择用于视频编码系统的编码模式的方法和装置。 在一个系统中，分别确定与由上述编码模式中的每一个的当前视频码及其编码参数组成的总代码量相关的值，并选择与该最小值对应的编码模式。 然后，使用所选择的编码模式进行编码。

    Motion video coding systems with motion vector detection
    6.
    发明授权
    Motion video coding systems with motion vector detection 失效
    具有运动矢量检测的运动视频编码系统

    公开(公告)号：US5650829A

    公开(公告)日：1997-07-22

    申请号：US425647

    申请日：1995-04-20

    申请人： Etsuko Sugimoto ,  Takashi Urano ,  Satoko Kobayashi ,  Yasuhachi Hamamoto ,  Hideo Kodama

    发明人： Etsuko Sugimoto ,  Takashi Urano ,  Satoko Kobayashi ,  Yasuhachi Hamamoto ,  Hideo Kodama

    IPC分类号： H04N7/26 ,  H04N7/36 ,  H04N7/50

    CPC分类号： H04N19/507 ,  H04N19/43 ,  H04N19/51

    摘要： A motion vector detecting circuit and a motion video compressing system are disclosed. The detecting circuit detect a vector which direct from a spatial location of a current macroblock to a spatial location of a reference macroblock. The detecting circuit includes a first extracting circuit, a second extracting circuit and a searching circuit. The first extracting circuit extracts upper bits from each pixel data of the current macroblock. The second extracting circuit extracts upper bits from each pixel data of the reference frame. The searching circuit searches the upper-bits-extracted reference frame for a macroblock having the strongest correlation with the current macroblock by comparing the upper-bits-extracted current macroblock with the upper-bits-extracted reference frame and outputs the spatial location of the reference macroblock. The motion video compressing system includes the motion vector detecting circuit, a transform-coding circuit, a subtracter, a comparator and a controller. The transform-coding circuit codes inputted data into compressed. The subtracter calculates a difference between each pixel data of the current macroblock and each corresponding pixel data of the reference macroblock directed by the motion vector. The comparator compares an amount of data being obtained by the transform-coding the current macroblock with an amount of data being obtained by the transform-coding the differential macroblock. The controller controls the transform-coding circuit such that the transform-coding circuit outputs which of the compressed current macroblock and the compressed differential macroblock has a smaller amount of data.

    摘要翻译： 公开了运动矢量检测电路和运动视频压缩系统。 检测电路检测从当前宏块的空间位置引导到参考宏块的空间位置的向量。 检测电路包括第一提取电路，第二提取电路和搜索电路。 第一提取电路从当前宏块的每个像素数据中提取高位。 第二提取电路从参考帧的每个像素数据中提取高位。 搜索电路通过将高比特率提取的当前宏块与高位提取的参考帧进行比较，来搜索与比特提取的参考帧中的与当前宏块最相关的宏块，并输出参考的空间位置 宏块。 运动视频压缩系统包括运动矢量检测电路，变换编码电路，减法器，比较器和控制器。 变换编码电路对输入的数据进行压缩编码。 减法器计算当前宏块的每个像素数据和由运动向量指导的参考宏块的每个对应像素数据之间的差。 比较器将通过对当前宏块进行变换编码获得的数据量与通过对差分宏块进行变换编码获得的数据量进行比较。 控制器控制变换编码电路，使得变换编码电路输出压缩的当前宏块和压缩的差分宏块中的哪一个具有较小的数据量。