Adaptive nonseparable interpolation for image compression with directional wavelet transform
Adaptive nonseparable interpolation for image compression with directional wavelet transform
复制标题
定向小波变换图像压缩的自适应不可分离插值
DOI：
10.1109/lsp.2007.914929
复制
发表时间：
2008-01-01
影响因子：
3.9
通讯作者：
Xu, Jizheng
中科院分区：
文献类型：
--
作者：
Dong, Weisheng;Shi, Guangming;Xu, Jizheng
自适应方向提升小波变换（ADL）局部自适应滤波方向的局部性质的图像。在这封信中，而不是使用传统的插值滤波器的方向预测与分数像素精度，一个新的二维不可分离的自适应插值滤波器的建议。为每个分数像素方向计算自适应滤波器，以便最小化预测误差的能量。讨论了减少预测误差和编码插值滤波器的开销之间的折衷。这使得编码增益高达0.98 dB，相比ADL编码器，高达2.4 dB，相比JPEG 2000的典型测试图像。
The adaptive directional lifting-based wavelet transform (ADL) locally adapts the filtering directions to the local properties of the image. In this letter, instead of using the conventional interpolation filter for the directional prediction with fractional-pel accuracy, a new two-dimensional nonseparable adaptive interpolation filter is proposed. The adaptive filter is calculated for every fractional-pel direction so as to minimize the energy of the prediction error. The tradeoff between reducing the prediction error and the overhead to code the interpolation filter is discussed. This enables coding gains of up to 0.98 dB, compared to ADL coder, and up to 2.4 dB, compared to the JPEG 2000 for typical test images.