公开(公告)号：US08374450B2

公开(公告)日：2013-02-12

申请号：US12471431

申请日：2009-05-25

申请人： Amir Averbuch ,  Valery Zheludev ,  Moshe Guttmman

发明人： Amir Averbuch ,  Valery Zheludev ,  Moshe Guttmman

IPC分类号： G06K9/36 ,  G06K9/46

CPC分类号： H04N19/64 ,  H04N19/12 ,  H04N19/129 ,  H04N19/14 ,  H04N19/60 ,  H04N19/63

摘要： Methods for compression of two-dimensional data arrays which are piece-wise smooth in one direction and have oscillating events in the other direction. In one embodiment, a wavelet transform is applied in the piece-wise smooth direction and a local cosine transform (LCT) is applied in the direction with oscillatory events, both producing respective transform coefficients. The LCT coefficients are reordered to mimic a wavelet transform coefficient order, and both wavelet transform and reordered LCT coefficients are quantized and entropy coded to obtain a compressed 2D image. In some embodiments with oscillatory events in both directions, a LCT is applied in both directions and all the LCT coefficients in each direction are reordered before the quantization and entropy coding.

摘要翻译： 用于压缩在一个方向上分段平滑并且在另一个方向上具有振荡事件的二维数据阵列的方法。 在一个实施例中，以分段平滑方向应用小波变换，并且在具有振荡事件的方向上应用局部余弦变换（LCT），两者都产生各自的变换系数。 LCT系数被重新排序以模拟小波变换系数顺序，并且对小波变换和重新排序的LCT系数进行量化和熵编码以获得压缩的2D图像。 在具有两个方向上的振荡事件的一些实施例中，在两个方向上应用LCT，并且在量化和熵编码之前对每个方向上的所有LCT系数进行重新排序。