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    • 76. 发明授权
    • Fast fade operation on MPEG video or other compressed data
    • 对MPEG视频或其他压缩数据进行快速淡入淡出操作
    • US06633673B1
    • 2003-10-14
    • US09335462
    • 1999-06-17
    • Bo Shen
    • Bo Shen
    • G06K936
    • H04N19/90H04N19/126H04N19/142H04N19/179H04N19/48H04N19/60H04N19/70H04N19/87
    • A method and apparatus for receiving and processing compressed data, such as video or audio data, in a compressed domain. An exemplary preferred embodiment of the method and apparatus is embodied in a digital video editor programmed to determine appropriate sizes of amplitude adjustment steps to be directly applied to the compressed data in consideration of temporal dependencies of the compressed data. For a fade-out operation, DC coefficients are stepped down such that pixels of an image reproduced from the compressed data fade in a uniform manner; at the end of the DC fade-out, AC coefficients are then disabled. A preferred embodiment of the method and apparatus also provides compensation for quantization variations and operates in consideration of syntax particular to a compression standard with which the compressed data are compliant.
    • 一种用于在压缩域中接收和处理诸如视频或音频数据的压缩数据的方法和装置。 方法和装置的示例性优选实施例体现在数字视频编辑器中,编程为考虑到压缩数据的时间依赖性来确定要直接应用于压缩数据的幅度调整步骤的适当尺寸。 对于淡出操作,降低DC系数,使得从压缩数据再现的图像的像素以均匀的方式消失; 在直流衰减结束时,AC系数被禁用。 该方法和装置的优选实施例还提供对量化变化的补偿,并且考虑压缩数据符合的压缩标准的特定语法来操作。
    • 77. 发明授权
    • Fast compressed domain processing using orthogonality
    • 使用正交性进行快速压缩域处理
    • US06490323B1
    • 2002-12-03
    • US09335464
    • 1999-06-17
    • Bo ShenVasudev Bhaskaran
    • Bo ShenVasudev Bhaskaran
    • H04N712
    • H04N19/90H04N19/48H04N19/60
    • A method and apparatus for receiving and processing digitized video data in a discrete cosine transform (DCT) domain exploits the orthogonality of a convolution function along with the data sparseness present in the DCT domain. In a preferred method, the convolution function is applied to vectors associated with a plurality of input video data frames in consideration of an orthogonal characteristic of the convolution function. More specifically, cross-products of the input vectors which would yield non-zero output vectors are identified and weighting factors for the cross-products are determined in consideration of this orthogonality. An output video data frame is generated from the non-zero output vectors and the weighting factors. A convolution operation based upon the disclosed method and aparatus is suitable for chroma-keying as well as other video or audio blending applications.
    • 用于在离散余弦变换(DCT)域中接收和处理数字化视频数据的方法和装置利用卷积函数的正交性以及存在于DCT域中的数据稀疏性。 在优选的方法中,考虑到卷积函数的正交特性,卷积函数被应用于与多个输入视频数据帧相关联的矢量。 更具体地,识别将产生非零输出向量的输入向量的交叉乘积,并且考虑到该正交性来确定交叉乘积的加权因子。 从非零输出向量和加权因子生成输出视频数据帧。 基于所公开的方法和装置的卷积操作适合于色键以及其它视频或音频混合应用。