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    • 13. 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。
    • 15. 发明申请
    • Video Decoding with Reduced IDCT Calculations
    • 视频解码与减少的IDCT计算
    • US20080215654A1
    • 2008-09-04
    • US12121018
    • 2008-05-15
    • Shijun SunShawmin Lei
    • Shijun SunShawmin Lei
    • G06F17/14
    • 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; 并且生成像素信息的n×m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。
    • 20. 发明申请
    • Temporal scalable coding using AVC coding tools
    • 使用AVC编码工具的时间可伸缩编码
    • US20060013305A1
    • 2006-01-19
    • US10951863
    • 2004-09-27
    • Shijun Sun
    • Shijun Sun
    • H04B1/66H04N7/12H04N11/04H04N11/02
    • H04N19/58H04N19/102H04N19/134H04N19/172H04N19/177H04N19/187H04N19/31H04N19/46H04N19/61
    • A temporally scalable video coding method is provided to interleave pictures from all layers of a video sequence including video sub-sequences organized using enhancement layers following a set of rules: (1) pictures in each layer are to be coded sequentially within the layer; (2) a picture from an upper layer should be coded when its temporally closest neighboring pictures among all lower layers (in both forward and backward directions if available) have been already coded; in other words, coding of an upper-layer picture requires the temporally closest neighboring pictures among all lower layers (in both forward and backward directions if available) be coded before hand. To ensure a reasonable coding efficiency, for each picture, its qualified reference pictures may be reordered so that the reference pictures are ordered using their relative temporal distance from the current picture instead of the default picture coding order.
    • 提供了一种时间上可分级的视频编码方法,用于根据一组规则来交织包括使用增强层组织的视频子序列的视频序列的所有层的图像:(1)每层中的图像将被顺序地编码在该层内; (2)当上层图片的时间上最接近的相邻图片(如果有的话)向前和向后方向(如果有的话)已经被编码,则编码来自上层的图片; 换句话说,上层图像的编码需要所有下层之间的时间上最接近的相邻图像(在前向和后向两个方向(如果可用))之前被编码。 为了确保合理的编码效率,对于每个图像,其合格的参考图片可以被重新排序,使得使用它们与当前图片的相对时间距离而不是默认图片编码顺序来排序参考图片。