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To maintain visual quality for low bit-rate video efficiently, this study analyzes the decoded information in the transcoder and proposes a Bayesian theorem-based region-of-interest (ROI) determination algorithm. In addition, a curve fitting scheme is employed to find the models of video bit-rate conversion. The transcoded video will conform to the target bit-rate by re-quantization according to our proposed models. After integrating the ROI detection method and the bit-rate transcoding models, the ROI-based transcoder allocates more coding bits to ROI regions and reduces the complexity of the re-encoding procedure for non-ROI regions. Hence, it not only keeps the coding quality but improves the efficiency of the video transcoding for low target bit-rates and makes the real-time transcoding more practical. Experimental results show that the proposed framework gets significantly better visual quality.<\/jats:p>","DOI":"10.1186\/1687-6180-2013-112","type":"journal-article","created":{"date-parts":[[2013,5,29]],"date-time":"2013-05-29T22:15:22Z","timestamp":1369865722000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Region-of-interest determination and bit-rate conversion for H.264 video transcoding"],"prefix":"10.1186","volume":"2013","author":[{"given":"Shu-Fen","family":"Huang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mei-Juan","family":"Chen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kuang-Han","family":"Tai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mian-Shiuan","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2013,5,29]]},"reference":[{"key":"510_CR1","doi-asserted-by":"publisher","first-page":"186","DOI":"10.1016\/j.jvcir.2005.05.010","volume":"17","author":"SK Kwon","year":"2006","unstructured":"Kwon SK, Tamhankar A, Rao KR: Overview of H.264\/MPEG-f part 10. 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