天津市建设厅官方网站,wordpress设置404,泰安房产网租房,重庆公司专业建站CDEF允许编解码器沿某些(可能是倾斜的)方向应用非线性消阶滤波器。它以88为单位进行。如下图所示#xff0c;通过旋转和反射所示的三个模板来定义八个预设方向。 Templates of preset directions and their associated directions. The templates correspond to directions of…CDEF允许编解码器沿某些(可能是倾斜的)方向应用非线性消阶滤波器。它以8×8为单位进行。如下图所示通过旋转和反射所示的三个模板来定义八个预设方向。 Templates of preset directions and their associated directions. The templates correspond to directions of 45◦, 22.5◦, and 0◦, as shown by the dash lines. Each preset direction d ∈ {0,...,7} can be obtained by using the template directly, rotating the template by 90◦ clockwise (marked by †) or reflecting the template along the horizontal axis (marked by ρ) 解码器利用重建像素通过最小化下式来选择向索引 式中xp为像素p的值Pd,k为沿d方向k行的像素μd,k为Pd,k的平均值; 一个主要的滤波器是沿着所选的方向应用而一个次要的滤波器沿着主方向的偏移45◦的方向应用。像素p(x, y)的滤波运算公式为 其中 wp d,m,n 和 ws d,m,n 分别为与主滤波器和次滤波器相关联的滤波器系数如下图所示。其中Sp、Ss为主要滤波器和次要滤波器的强度指标D为阻尼系数。f()是一个分段线性函数 Primary filter templates associated with direction d ∈ {0,...,7} (subject to rotation and reflection), where w1 4/16 and w2 2/16 for even strength indexes, and w1 w2 3/16 for odd strength indexes. Secondary filter templates associated with each direction (subject to reflection), where w3 2/16 and w4 1/16. The secondary filter is applied along the direction 45◦ off the corresponding primary direction d. 它排除了值远离p(x, y)的参考像素。注意参考像素p(m, n)是在应用去块滤波器之后但在应用CDEF滤波器之前重建的像素。
Frame Header中传输多达八组滤波器参数包括亮度和色度分量的主滤波器和次滤波器强度指标。每个64 × 64块从预设中选择一组来控制滤波器操作。
