DocumentCode :
3266181
Title :
Robust image coding using the embedded zerotree wavelet algorithm
Author :
Creusere, Charles D.
Author_Institution :
Weapons Div., Naval Air Dev. Center, China Lake, CA, USA
fYear :
1996
fDate :
Mar/Apr 1996
Firstpage :
432
Abstract :
We present a new family of image compression algorithms derived from Shapiro´s embedded zerotree wavelet (EZW) coder. These new algorithms introduce robustness to transmission errors into the bit stream while still preserving its embedded structure. This is done by partitioning the wavelet coefficients into groups, coding each group independently, and interleaving the bit streams for transmission-thus, if one bit is corrupted, then only one of these bit streams will be truncated in the decoder. If each group of wavelet coefficients uniformly spans the entire image, then the objective and subjective qualities of the reconstructed image can be very good even when an error occurs. To illustrate the advantages of this new family, we compare the performance of some of its members to that of the conventional EZW coder. For example, one of the robust variations has a peak signal to noise ratio (PSNR) slightly lower than the conventional algorithm when no errors occur (-0.12 dB for Lena and -0.5 dB for Barbara, both coded at 1.0 bits/pixel), but when a single error occurs at bit 1000, the PSNR of the new coder is more than 5 dB higher for both test images. The PSNR versus the bit error position is shown using two different partitionings of the wavelet coefficients and four interleaved bit streams
Keywords :
data compression; decoding; image coding; image reconstruction; transform coding; wavelet transforms; EZW coder; PSNR; bit error position; bit stream; bit streams interleaving; decoder; embedded structure; embedded zerotree wavelet algorithm; embedded zerotree wavelet coder; image coding; image compression algorithms; image reconstruction; peak signal to noise ratio; performance; transmission errors robustness; wavelet coefficients; Decoding; Image coding; Image reconstruction; Interleaved codes; Noise robustness; PSNR; Partitioning algorithms; Pixel; Streaming media; Wavelet coefficients;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Data Compression Conference, 1996. DCC '96. Proceedings
Conference_Location :
Snowbird, UT
ISSN :
1068-0314
Print_ISBN :
0-8186-7358-3
Type :
conf
DOI :
10.1109/DCC.1996.488364
Filename :
488364
Link To Document :
بازگشت