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231223s2001 xx |||||o 00| ||eng c |
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|a 10.1109/83.918562
|2 doi
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|a eng
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|a Lee, J B
|e verfasserin
|4 aut
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|a Optimal buffered compression and coding mode selection for MPEG-4 shape coding
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|c 2001
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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| 500 |
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|a Date Completed 15.12.2009
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|a Date Revised 05.02.2008
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a We propose an optimal buffered compression algorithm for shape coding as defined in the forthcoming MPEG-4 international standard. The MPEG-4 shape coding scheme consists of two steps: first, distortion is introduced by down and up scaling; then, context-based arithmetic encoding is applied. Since arithmetic coding is "lossless," the down up scaling step is considered as a virtual quantizer. We first formulate the buffer-constrained adaptive quantization problem for shape coding, and then propose an algorithm for the optimal solution under buffer constraints. Previously, the fact that a conversion ratio (CR) of 1/4 makes a coded image irritating to human observers for QCIF size was reported for MPEG-4 shape coding. Therefore, careful consideration for small size images such as QCIF should be given to prevent coded images from being unacceptable. To this end, a low bit rate tuned algorithm is proposed in this paper as well. Experimental results are given using an MPEG-4 shape codec
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|a Journal Article
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|a Cho, J S
|e verfasserin
|4 aut
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| 700 |
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|a Eleftheriadis, A
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t IEEE transactions on image processing : a publication of the IEEE Signal Processing Society
|d 1992
|g 10(2001), 5 vom: 15., Seite 686-700
|w (DE-627)NLM09821456X
|x 1057-7149
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|g volume:10
|g year:2001
|g number:5
|g day:15
|g pages:686-700
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|u http://dx.doi.org/10.1109/83.918562
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