公开(公告)号：US20070223828A1

公开(公告)日：2007-09-27

申请号：US11805172

申请日：2007-05-22

申请人： Shijun Sun ,  Shawmin Lei

发明人： Shijun Sun ,  Shawmin Lei

IPC分类号： G06K9/36

CPC分类号： G06F17/147 ,  G06T9/007

摘要： 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.

摘要翻译： 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。