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   -> Volume 7, Issue 10


Preprint: A New Image Compression Algorithm (HEP Algorithm)
 
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lxj (lxj@ns.glc.cn.net)
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PostPosted: Wed Sep 30, 1998 3:27 am    
Subject: Preprint: A New Image Compression Algorithm (HEP Algorithm)
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#5 Preprint: A New Image Compression Algorithm (HEP Algorithm)

A New Image Compression Algorithm (HEP Algorithm)

ABSTRACT We know JPEG is faster than Wavelet transform algorithm, but
its fidelity is poorer than Wavelet's. As an international standard,
JPEG/MPEG is widely applied in multimedia fields. In recent years,
several new image codings based on WT have been presented, such as
EZW, HARC, SPIHT et al., these schemes can get better fidelity, but
very slow. If there is a method to combine their benefits, we can get
better fidelity and faster speed. HEP algorithm is doing so. HEP is
based on DCT and WT coding scheme, it is faster than WT coding and
better fidelity than JPEG's. The following results are based on HEP
algorithm.

TEST image : LENNA 512*512*8bit

HEP JPEG EZW
CR PSNR(dB) PSNR(dB) CR PSNR(dB)
4.4 42.8 40.9 4.0 44.8
8.4 39.0 37.7 8.0 39.6
15.5 35.8 34.7 16.0 36.3
28.8 32.7 31.2 32.0 33.2
55.2 29.5 24.8 64.0 30.3
106 26.0 -- 128.0 27.5

HEP is over twice as fast as EZW, in addition, the subject evaluation is
better than EZW. There is no blur, no block effects.

Now a new image/speech recognition method based on HEP is been studying
in my research, the primary results manifest that HEP algorithm is very
effective.
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