New combined source/channel wavelet based hybrid subband image coding /
Wavelet based subband image coding has been shown to be an
| Main Author: | |
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1997.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=736823951&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Wavelet based subband image coding has been shown to be an effective image compression technique for high quality source coding at low-bit rates. This dissertation addresses the fundamentals of the major topics of digital image data compression and transmission with an approach utilizing a new wavelet based hybrid image coding and a special-modeled source. It also provides the discussion of the Adaptive Correlated Switching Predictors for DPCM (ACSP-DPCM) which adapt the correlation values per block. And, it also discusses the new modified DPCM which reduces the entropy a considerable amount throughout the encoding process. When transmitting. the spatial diversity channel is addressed subject to a constraint on the wavelet coefficients and the inter- and intra-band energy similarities of the subbands. While encoding, an adaptive thresholding method, along with different quantizers, based upon the distribution of sources is discussed. Experimental results show that the compression ratio of about 32:1 still provides good quality for a reconstructed image and for a high channel noise an acceptable reconstructed image (above 40 dB of PSNR). |
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| Item Description: | Vita. "Major Subject: Electrical Engineering". |
| Physical Description: | xii, 105 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 92-104. |