用于图象压缩中的非等长小波滤波器

Asymmertical Wavlet Filter Banks for Image Compression

构造了用于图象压缩的满足完全重构条件，具有线性相位的不等长小波滤波器组，即在小波分解时，其高通滤波器很短，而低通滤波器相对较长。这样，在滤波器等效总长度较短的前提下，获得了基函数与实际波形较好地匹配。对比实验表明，所构造的滤波器性能不低于现有的滤波器，且由于滤波器总长度短，小波分解与重构所需的时间也比现有滤波器短。

The wavelet filter banks for image compression satisfying the conditions of perfect reconstruction,linear phase,asymmetric length are constructed.That is,in the wavelet decomposition analysis highpass filter is very short,the lowpass filter is long.So in the condition of filter banks equivalent length being short,basic functions match with signal wave form well.The experiments show that the performances of such filter banks are good and the speed is high during the decomposation or reconstruction compared with present one since its equivalent length is short.