The compression results
obtained by space-frequency quantization using the standard wavelet
transform and directionlets for Lena
Spatial segmentation of images generates blocking effect at segment
boundaries especially for low bit-rates. Post-processing deblocking
method (Xiong et al., 1997) removes successfully this effect.
compressed at the
bit-rate 0.057bpp using the standard SFQ (PSNR = 26.20dB) and
directionlets (PSNR = 26.92dB).
at the bit-rate 0.114bpp using the standard SFQ (PSNR = 20.03dB) and
directionlets (PSNR = 22.53dB).