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Ȩ Ȩ > ¿¬±¸¹®Çå > ±¹³» ³í¹®Áö > Çѱ¹Á¤º¸°úÇÐȸ ³í¹®Áö > Á¤º¸°úÇÐȸ ³í¹®Áö A : ½Ã½ºÅÛ ¹× ÀÌ·Ð

Á¤º¸°úÇÐȸ ³í¹®Áö A : ½Ã½ºÅÛ ¹× ÀÌ·Ð

Current Result Document : 11 / 12 ÀÌÀü°Ç ÀÌÀü°Ç   ´ÙÀ½°Ç ´ÙÀ½°Ç

ÇѱÛÁ¦¸ñ(Korean Title) µ¿¿µ»ó ½ºÆ®¸² Å©±â ¹× Ç°Áú ¿¹Ãø¿¡ ±â¹ÝÇÑ µ¿Àû µ¿¿µ»ó ÀûÀÀº¯È¯ ¹æ¹ý
¿µ¹®Á¦¸ñ(English Title) A Dynamic Video Adaptation Scheme based on Size and Quality Predictions
ÀúÀÚ(Author) ±èÁ¾Ç×   ³¶Á¾È£  
¿ø¹®¼ö·Ïó(Citation) VOL 32 NO. 02 PP. 0095 ~ 0105 (2005. 02)
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(Korean Abstract)
º» ³í¹®¿¡¼­´Â ¹Ýº¹ÀûÀÎ ÀÎÄÚµù/µðÄÚµù ÀÛ¾÷ ¾øÀÌ ¸ð¹ÙÀÏ ´Ü¸»±â³ª ÇöÀç ³×Å©¿÷ »óȲ¿¡ ÀûÇÕÇÑ µ¿¿µ»ó ½ºÆ®¸²À» »ý¼ºÇÏ´Â »õ·Î¿î µ¿Àû µ¿¿µ»ó ÀûÀÀº¯È¯ ¹æ¹ýÀ» Á¦¾ÈÇÑ´Ù. Á¦¾ÈÇÑ ¹æ¹ý¿¡¼­´Â MPEG-1/-2/-4¿Í °°Àº ºñµð¿À ÄÚµ¦ÀÇ Æ¯¼ºÀ» ºÎȣȭ µÈ µ¿¿µ»ó ½ºÆ®¸² Å©±â¿Í Ç°Áú¿¡ ÃÊÁ¡À» ¸ÂÃß¾î ¹Ì¸® ºÐ¼®ÇÏ°í, À̸¦ ÄÚµ¦ ÀÇÁ¸ÀûÀΠƯ¼º Å×À̺í·Î ÇÁ·Ï½Ã¿¡ ÀúÀåÇÑ´Ù. ÀÌ·± Ư¼º Å×ÀÌºí ³»¿ë°ú ´Ü¸»±â°¡ ¿äûÇÑ µ¿¿µ»ó¿¡ ´ëÇÑ ÃÖ°í Ç°Áú ½ºÆ®¸²ÀÇ Å©±â ¹× Ç°Áú Á¤º¸¸¦ ÀÌ¿ëÇÏ¿© ¿äûÇÑ ¸ð¹ÙÀÏ ´Ü¸»±â¿¡ ÀûÇÕÇÑ µ¿¿µ»ó ½ºÆ®¸²ÀÇ Å©±â ¹× Ç°ÁúÀ» µ¿ÀûÀ¸·Î ¿¹ÃøÇÒ ¼ö ÀÖ´Ù. Á¦¾ÈÇÑ ¹æ¹ý¿¡¼­´Â ÀÌ·± ¿¹ÃøÀ» ¹ÙÅÁÀ¸·Î µ¿¿µ»óÀÇ ÃÖ´ë Ç°ÁúÀ» À¯ÁöÇÏ¸ç ¸ð¹ÙÀÏ ´Ü¸»±âÀÇ °ø°£ Á¦¾àÀ» ¸¸Á·ÇÏ´Â ÀûÀÀÈ­ µÈ µ¿¿µ»ó ½ºÆ®¸² ¹öÀüÀ» ¹Ýº¹ÀûÀÎ ÀÎÄÚµù/µðÄÚµù ÀÛ¾÷ ¾øÀÌ »ý¼ºÇÑ´Ù. ½ÇÇè °á°ú Á¦¾ÈÇÑ ¹æ¹ýÀº 5% ¹Ì¸¸ÀÇ ¿ÀÂ÷À²·Î ¸Å¿ì ºü¸£°Ô µ¿Àû µ¿¿µ»ó ÀûÀÀº¯È¯À» ¼öÇàÇÔÀ» ¾Ë ¼ö ÀÖ¾ú´Ù. Á¦¾ÈÇÑ ¹æ¹ýÀº ´Ù¾çÇÑ ºñµð¿À ÄÚµ¦À¸·Î ºÎȣȭ µÈ ÀÎÅÍ³Ý »óÀÇ µ¿¿µ»óÀ» ºü¸£°Ô º¯È¯ÇÏ´Â ¸ð¹ÙÀÏ ´Ü¸»±â¸¦ À§ÇÑ ÇÁ·Ï½Ã ¼­¹ö¿¡ »ç¿ëµÉ ¼ö ÀÖÀ» °ÍÀÌ´Ù.
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(English Abstract)
This paper proposes a new dynamic video adaptation scheme that could generate an adapted video stream customized to the requesting mobile device and current network status without repeated decode-encode cycles. In the proposed adaptation scheme, the characteristics of the video codec such as MPEG-1/-2/-4 are analyzed in advance focused on the relationships between the size and quality of the encoded video stream, and they are stored in the proxy as a codec-dependent characteristic table. When a mobile device requests a video stream, it is dynamically decoded-encoded in the proxy with the highest quality to extract the contents-dependent attributes of the requested video stream. By comparing these attributes with codec-dependent characteristic table, the size and quality of the requested video stream when being adapted to the target mobile device could be predicted. With this prediction, a version of adapted video stream, that meets the size constraints of mobile device while keeping the quality of encoded video stream as high as possible, could be selected without repeated decode-encode cycles. Experimental results show that the errors in our proposed scheme are less than 5% and produce an appropriate adapted video stream very quickly. It could be used to build a proxy server for mobile devices that could quickly transcode the video streams widely spread in Internet which are encoded with various video codecs.
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Å°¿öµå(Keyword) µ¿¿µ»ó º¯È¯   Video Adaptation   ¹«¼± ¸ÖƼ¹Ìµð¾î   Wireless Multimedia   µ¿¿µ»ó È­Áú ¿¹Ãø   À̵¿ ´Ü¸»±â¿ë µ¿¿µ»ó  
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