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    • 5. 发明授权
    • Methods and systems for upsampling filter design
    • 滤波器设计采样方法和系统
    • US08638862B2
    • 2014-01-28
    • US11530853
    • 2006-09-11
    • Shijun Sun
    • Shijun Sun
    • H04N7/12
    • H04N19/59H04N19/117H04N19/136H04N19/186H04N19/33H04N19/61
    • Aspects of the present invention relate to systems, methods and devices for upsampling images and design of upsampling filters. Some aspects relate to a determination of a phase offset position in a higher resolution picture relative to a lower resolution picture. Interpolation filter coefficients for some filters may then be selected based on the filter offset. Other aspects relate to selection of coefficients for filters that are not dependent on the phase offset. In certain implementations, a weighting factor may be used to combine the effects of a phase-offset-dependent filter and an independent filter.
    • 本发明的方面涉及用于上采样图像和上采样滤波器的设计的系统,方法和装置。 一些方面涉及相对于较低分辨率图像确定较高分辨率图像中的相位偏移位置。 然后可以基于滤波器偏移来选择一些滤波器的插值滤波器系数。 其他方面涉及不依赖于相位偏移的滤波器的系数的选择。 在某些实现中,可以使用加权因子来组合相位偏移依赖滤波器和独立滤波器的效果。
    • 9. 发明授权
    • Video decoding with reduced IDCT calculations
    • 视频解码与IDCT计算减少
    • US07876969B2
    • 2011-01-25
    • US12121018
    • 2008-05-15
    • Shijun SunShawmin Lei
    • Shijun SunShawmin Lei
    • G06K9/46G06F17/14
    • G06F17/147G06T9/007
    • Reduced complexity inverse discrete cosine transform (IDCT) masks and a method for reducing the number of IDCT calculations in video decoding are provided. The method comprises: accepting an n×m matrix of DCT coefficients; performing (n−y) horizontal IDCT operations, where y is greater than 0; performing y scaling operations; and, generating an n×m block of pixel information. Some aspects of the method further comprise: performing (m−z) vertical IDCT operations, where z is in the range between 0 and m/2. In some aspects, performing (n−y) horizontal ICDT operations includes performing IDCT operations for the first (n−y) horizontal rows. Then, performing y scaling operations includes: selecting the DC component from the first position of each horizontal row; scaling the selected DC component; and, copying the scaled DC component into the remaining positions of each of horizontal row.
    • 提供了复杂度降低的离散余弦变换(IDCT)掩模和减少视频解码中IDCT计算次数的方法。 该方法包括:接受DCT系数的n×m矩阵; 执行(n-y)水平IDCT操作,其中y大于0; 执行y缩放操作; 并生成n×m像素信息块。 该方法的一些方面还包括:执行(m-z)垂直IDCT操作,其中z在0和m / 2之间的范围内。 在一些方面,执行(n-y)个水平ICDT操作包括执行第一(n-y)个水平行的IDCT操作。 然后,执行y缩放操作包括:从每个水平行的第一位置选择DC分量; 缩放选定的直流分量; 并且将缩放的直流分量复制到水平行中的每一个的剩余位置。