图像的正交变换，如傅立叶变换、离散余弦变换、沃尔什变换、小波变换-Image of the orthogonal transformation, such as Fourier transform, discrete cosine transform, Walsh transform, wavelet transform

基于双正交小波包的图像压缩研究，用于于2的图形开发的研究-Biorthogonal wavelet packet based image compression research

采用小波变换稀疏方法和正交匹配跟踪算法处理图像-Sparse wavelet method and orthogonal matching tracking algorithm