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Compression: directionlets + SFQ

For more details check this publication.


The compression results obtained by space-frequency quantization using the standard wavelet transform and directionlets for Lena, Barbara and Fingerprint.


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.


Lena compressed at the bit-rate 0.057bpp using the standard SFQ (PSNR = 26.20dB) and directionlets (PSNR = 26.92dB).


Fingerprint compressed at the bit-rate 0.114bpp using the standard SFQ (PSNR = 20.03dB) and directionlets (PSNR = 22.53dB).