DC Field | Value | Language |
---|---|---|
dc.contributor.author | Seo, KD | ko |
dc.contributor.author | Yoo, KY | ko |
dc.contributor.author | Kim, Jae Kyoon | ko |
dc.date.accessioned | 2013-03-03T16:54:41Z | - |
dc.date.available | 2013-03-03T16:54:41Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2002-10 | - |
dc.identifier.citation | IEICE TRANSACTIONS ON COMMUNICATIONS, v.E85B, no.10, pp.2161 - 2170 | - |
dc.identifier.issn | 0916-8516 | - |
dc.identifier.uri | http://hdl.handle.net/10203/79562 | - |
dc.description.abstract | In this paper, we propose an efficient requantization method for INTRA-frames in MPEG-1/MPEG-4 transcoding. The quantizer for an MPEG-1 INTRA block usually uses a quantization weighting matrix, while the quantizer for an MPEG-4 simple profile does not. As a result, the quantization step sizes of the two quantizers may not be the same even for the same quantization parameter. Due to this mismatch in the quantization step size, a transcoded MPEG-4 sequence can suffer from serious quality degradation and the number of bits produced by transcoding increases from the original MPEG-1 video sequence. To solve these problems, an efficient method is proposed to identify a near-optimum reconstruction level in the transcoder. In addition, a Laplacian-model based PDF (probability distribution function) estimation for the original DCT coefficients from an input MPEG-I bitstream is presented, which is required for the proposed requantization. Experimental results show that the proposed method provides a 0.3-0.7dB improvement in the PSNR over the conventional method, even at a reduced bit-rate of 3-7%. | - |
dc.language | English | - |
dc.publisher | IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG | - |
dc.subject | VIDEO | - |
dc.title | Laplacian-model based requantization for INTRA-frame transcoding in VOD application | - |
dc.type | Article | - |
dc.identifier.wosid | 000178423600034 | - |
dc.type.rims | ART | - |
dc.citation.volume | E85B | - |
dc.citation.issue | 10 | - |
dc.citation.beginningpage | 2161 | - |
dc.citation.endingpage | 2170 | - |
dc.citation.publicationname | IEICE TRANSACTIONS ON COMMUNICATIONS | - |
dc.contributor.nonIdAuthor | Seo, KD | - |
dc.contributor.nonIdAuthor | Yoo, KY | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | video coding | - |
dc.subject.keywordAuthor | quantization | - |
dc.subject.keywordAuthor | transcoding | - |
dc.subject.keywordAuthor | MPEG | - |
dc.subject.keywordPlus | VIDEO | - |
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