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    METHOD AND APPARATUS FOR RATE CONTROL ACCURACY IN VIDEO ENCODING
    4.
    发明申请
    METHOD AND APPARATUS FOR RATE CONTROL ACCURACY IN VIDEO ENCODING 有权
    视频编码中速率控制精度的方法与装置

    公开(公告)号：US20110051807A1

    公开(公告)日：2011-03-03

    申请号：US12735441

    申请日：2009-01-15

    申请人： Yali Liu ,  Qian Xu ,  Xiaoan Lu ,  Cristina Gomila

    发明人： Yali Liu ,  Qian Xu ,  Xiaoan Lu ,  Cristina Gomila

    IPC分类号： H04N7/26

    CPC分类号： H04N19/192 ,  H04N19/124 ,  H04N19/149 ,  H04N19/172 ,  H04N19/176 ,  H04N19/61

    摘要： A method and apparatus are provided for rate control accuracy in video encoding. The apparatus includes a video encoder for encoding image data in a single encoding pass using rate control. The rate control involves defining a quantization step size value and a rounding offset value and refining at least the rounding offset value. The image data is encoded responsive to the quantization step size value and the refined rounding offset value.

    摘要翻译： 提供了一种用于视频编码中的速率控制精度的方法和装置。 该装置包括用于使用速率控制在单个编码通道中对图像数据进行编码的视频编码器。 速率控制涉及定义量化步长值和舍入偏移值，并且至少精炼舍入偏移值。 响应于量化步长值和精化舍入偏移值来编码图像数据。

    Method and apparatus for joint quantization parameter adjustment
    5.
    发明申请
    Method and apparatus for joint quantization parameter adjustment 有权
    联合量化参数调整的方法和装置

    公开(公告)号：US20100290524A1

    公开(公告)日：2010-11-18

    申请号：US12800263

    申请日：2010-05-12

    申请人： Xiaoan Lu ,  Qian Xu ,  Cristina Gomila

    发明人： Xiaoan Lu ,  Qian Xu ,  Cristina Gomila

    IPC分类号： H04N7/32

    CPC分类号： H04N19/00157 ,  H04N19/124 ,  H04N19/14 ,  H04N19/154 ,  H04N19/176 ,  H04N19/61

    摘要： The present principles provides a method and apparatus for jointly adjusting the rounding offset and the quantization step size on a macroblock level to improve the perceptual quality of the fine details of the encoded image. In one implementation, the content of the pictures is analyzed and the smooth regions are identified. A quantization step size value for the picture is initially defined and a rounding offset is adaptively assigned to each macroblock based on the content characteristics. The quantization step size is then calculated for the a particular macroblock according to another content characteristic of the macroblock such that the encoding of the particular macroblock is performed in response to the calculated quantization step size and the rounding offset value of the first block.

    摘要翻译： 本发明提供了一种用于在宏块级别上联合调整舍入偏移量和量化步长的方法和装置，以提高编码图像的精细细节的感知质量。 在一个实现中，分析图像的内容并且识别平滑区域。 最初定义图像的量化步长值，并且基于内容特征对每个宏块自适应地分配舍入偏移。 然后根据宏块的另一内容特性，针对特定宏块计算量化步长，使得响应于计算出的量化步长和第一块的舍入偏移值执行特定宏块的编码。

    METHODS AND APPARATUS FOR IMPROVED QUANTIZATION ROUNDING OFFSET ADJUSTMENT FOR VIDEO ENCODING AND DECODING
    7.
    发明申请
    METHODS AND APPARATUS FOR IMPROVED QUANTIZATION ROUNDING OFFSET ADJUSTMENT FOR VIDEO ENCODING AND DECODING 有权
    用于改进视频编码和解码的改进量化偏移调整的方法和装置

    公开(公告)号：US20120051421A1

    公开(公告)日：2012-03-01

    申请号：US13319779

    申请日：2010-05-12

    申请人： Xiaoan Lu ,  Qian Xu ,  Cristina Gomila

    发明人： Xiaoan Lu ,  Qian Xu ,  Cristina Gomila

    IPC分类号： H04N7/26

    CPC分类号： H04N19/179 ,  H04N19/124 ,  H04N19/14 ,  H04N19/159 ,  H04N19/17 ,  H04N19/172 ,  H04N19/174 ,  H04N19/176

    摘要： There are provided methods and apparatus for improved quantization rounding offset adjustment for video encoding and decoding. An apparatus includes a video encoder for encoding an input coding unit by determining a residual for the input coding unit corresponding to a difference between the input coding unit and a reference coding unit, applying a transform to the residual to obtain at least one transform coefficient, and quantizing the at least one transform coefficient by selecting a particular quantization step size and a rounding offset.

    摘要翻译： 提供了用于改进用于视频编码和解码的量化舍入偏移调整的方法和装置。 一种装置，包括：视频编码器，用于通过确定与输入编码单元和参考编码单元之间的差异对应的输入编码单元的残差来对输入编码单元进行编码，向残差应用变换以获得至少一个变换系数， 以及通过选择特定的量化步长和舍入偏移量化所述至少一个变换系数。

    Method and apparatus for joint quantization parameter adjustment
    8.
    发明授权
    Method and apparatus for joint quantization parameter adjustment 有权
    联合量化参数调整的方法和装置

    公开(公告)号：US08848788B2

    公开(公告)日：2014-09-30

    申请号：US12800263

    申请日：2010-05-12

    申请人： Xiaoan Lu ,  Qian Xu ,  Cristina Gomila

    发明人： Xiaoan Lu ,  Qian Xu ,  Cristina Gomila

    IPC分类号： H04N7/32 ,  H04N19/124 ,  H04N19/154 ,  H04N19/61 ,  H04N19/14 ,  H04N19/176

    CPC分类号： H04N19/00157 ,  H04N19/124 ,  H04N19/14 ,  H04N19/154 ,  H04N19/176 ,  H04N19/61

    摘要： The present principles provides a method and apparatus for jointly adjusting the rounding offset and the quantization step size on a macroblock level to improve the perceptual quality of the fine details of the encoded image. In one implementation, the content of the pictures is analyzed and the smooth regions are identified. A quantization step size value for the picture is initially defined and a rounding offset is adaptively assigned to each macroblock based on the content characteristics. The quantization step size is then calculated for the a particular macroblock according to another content characteristic of the macroblock such that the encoding of the particular macroblock is performed in response to the calculated quantization step size and the rounding offset value of the first block.

    摘要翻译： 本发明提供了一种用于在宏块级别上联合调整舍入偏移量和量化步长的方法和装置，以提高编码图像的精细细节的感知质量。 在一个实现中，分析图像的内容并且识别平滑区域。 最初定义图像的量化步长值，并且基于内容特征对每个宏块自适应地分配舍入偏移。 然后根据宏块的另一内容特性，针对特定宏块计算量化步长，使得响应于计算出的量化步长和第一块的舍入偏移值执行特定宏块的编码。

    SPATIAL ACTIVITY METRIC AND METHOD FOR EVALUATING THE SAME
    9.
    发明申请
    SPATIAL ACTIVITY METRIC AND METHOD FOR EVALUATING THE SAME 审中-公开
    空间活动度量及评估方法

    公开(公告)号：US20090268981A1

    公开(公告)日：2009-10-29

    申请号：US12310711

    申请日：2007-09-18

    申请人： Xiaoan Lu ,  Jiefu Zhai ,  Cristina Gomila

    发明人： Xiaoan Lu ,  Jiefu Zhai ,  Cristina Gomila

    IPC分类号： G06K9/40

    CPC分类号： G06T7/41

    摘要： A spatial activity metric for characterizing an image is established, typically based one of the image variance, image gradient or DCT coefficients. The spatial activity metric is then reduced by the amount of the estimated noise in the image so that upon the spatial activity metric in connection with spatial masking, the likelihood of unmasked distortion caused by the presence of noise, such as film grain will be reduced. The effectiveness of such a spatial activity metric can be determined by determining similarity of the measures made by the spatial activity metric for regions in the image of similar texture and by determining the difference in the measures made by the spatial activity metric for regions of different texture in the image.

    摘要翻译： 通常基于图像方差，图像梯度或DCT系数之一建立用于表征图像的空间活动度量。 然后，空间活动度量减小图像中的估计噪声的量，使得在与空间屏蔽相关的空间活动度量时，由于诸如胶片颗粒的噪声的存在而引起的未屏蔽失真的可能性将减小。 这样的空间活动度量的有效性可以通过确定由相似纹理图像中的区域的空间活动度量所做出的度量的相似度，并且通过确定由不同纹理的区域的空间活动度量所做的度量的差异来确定 在图像中。