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ÇѱÛÁ¦¸ñ(Korean Title) |
´ë¿ªÆø °¨¼Ò¸¦ Àû¿ëÇÑ MPEG-4 ¹Ìµð¾î Àü¼Û½ÃÀÇ ¾ÏÈ£È ±â¹ý ¿¬±¸ |
¿µ¹®Á¦¸ñ(English Title) |
Encryption Scheme for MPEG-4 Media Transmission Exploiting Frame Dropping |
ÀúÀÚ(Author) |
Dongkyoo Shin
Dongil Shin
Seyoung Park
½Åµ¿±Ô
½Åµ¿ÀÏ
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¿ø¹®¼ö·Ïó(Citation) |
VOL 15-B NO. 06 PP. 0575 ~ 0584 (2008. 12) |
Çѱ۳»¿ë (Korean Abstract) |
¹Ìµð¾îÀÇ Àü¼Û½Ã ³×Æ®¿öÅ©ÀÇ »óȲ¿¡ µû¶ó Åë½Å¸ÁÀÇ °úºÎÇÏ°¡ ¹ß»ýÇÒ ¼ö ÀÖÀ¸¸ç, À̸¦ ÁÙÀ̱â À§Çؼ ÇÊÅ͸µ, ºÎÇÏ ºÐ»ê±â¹ý, ¸·Èû Á¦¾î ±â¹ý, ÇÁ·¹ÀÓ µå·ÎÇÎ µîÀÇ ¸¹Àº ¿¬±¸°¡ ÁøÇàµÇ¾ú´Ù. À̵é Áß È¿°úÀûÀÎ ¹æ¹ýÀº µ¿¿µ»óÀÇ ºñÆ®À²À» Á¶ÀýÇϱâ À§ÇØ Æ¯Á¤ ºñµð¿À ÇÁ·¹ÀÓÀ» Á¦°ÅÇÔÀ¸·Î½á ´ë¿ªÆøÀÇ °¨¼Ò¸¦ °¡´ÉÇÏ°Ô ÇÏ´Â ÇÁ·¹ÀÓ µå·ÎÇÎ(Frame dropping)ÀÌ´Ù. ÇÁ·¹ÀÓ µå·ÎÇÎÀº ÇÁ·¹ÀÓ °£ÀÇ Á¾¼Ó¼ºÀÌ °¡Àå ÀûÀº B ÇÁ·¹ÀÓÀ» ¸ÕÀú Á¦°ÅÇÏ°í Á¾¼Ó¼ºÀÇ °ü°è¿¡ µû¶ó I, P ÇÁ·¹ÀÓ ¼ø¼´ë·Î Á¦°ÅÇÑ´Ù. º» ³í¹®¿¡¼´Â MPEG-4 ¹Ìµð¾îÀÇ Àü¼Û¿¡ ÇÁ·¹ÀÓ µå·ÎÇÎÀ» Àû¿ë ÇÏ¿´À¸¸ç À̶§ ¾Ïȣȸ¦ ÅëÇÏ¿© ÀúÀÛ±ÇÀ» º¸È£ÇÒ ¼ö ÀÖ´Â ¹æ¹ýÀ» Á¦¾ÈÇÑ´Ù. À̸¦ À§ÇÏ¿© ¼¹ö¿¡ ÀúÀåµÇ¾îÀÖ´Â ÇÁ·¹ÀÓ µå·ÎÇÎ ÀÌ ÀÌ¹Ì Àû¿ëµÈ ÆÄÀÏÀ» Ŭ¶óÀ̾ðÆ®¿¡°Ô Àü¼ÛÇÏ´Â ¹æ¹ý°ú ¼¹ö¿¡ ÀúÀåµÇ¾îÀÖ´Â ¹Ìµð¾î ÆÄÀÏÀ» Ŭ¶óÀ̾ðÆ®¿¡°Ô Àü¼Û½Ã ½Ç½Ã°£À¸·Î ÇÁ·¹ÀÓ µå·ÎÇÎÇÏ´Â µÎ °¡Áö ¹æ¹ýÀ» ¼³°è ±¸Çö ÇÏ¿´´Ù. MPEG-4 µ¥ÀÌÅÍÀÇ ¾Ïȣȿ¡´Â 3°¡Áö ¹æ¹ýÀ» Á¦¾ÈÇÏ¿´´Ù: I-VOP³»ÀÇ ¸ÅÅ©·Î ºí·Ï(Macro block) ¾ÏÈ£È, P-VOP³»ÀÇ ¸ÅÅ©·Î ºí·Ï°ú ¸ð¼Çº¤ÅÍ ¾ÏÈ£È(Motion Vector), I-VOP³»ÀÇ ¸ÅÅ©·Îºí·Ï°ú P-VOP³»ÀÇ ¸ð¼Çº¤ÅÍ ¾ÏÈ£È. MPEG-4 ¹Ìµð¾îÀÇ Àü¼Û½Ã, ÃÖÀûÀÇ ¹æ¹ýÀ» ¼±ÅÃÇϱâ À§ÇØ µå·ÎÇÎ, ¾ÏÈ£È, º¹È£È ¹× ¿µ»óÀÇ Ç°ÁúÀ» ºñ±³ÇÏ¿´À¸¸ç µå·ÎÇÎ ÈÄ¿¡µµ ¿ø·¡ÀÇ ¿µ»ó°ú Å« Â÷ÀÌ°¡ ¾ø¾ú´Ù. ¾ÏÈ£È¿Í º¹È£È¿¡¼´Â I-VOP¿Í P-VOP¸¦ ¸ðµÎ ¾ÏÈ£È ÇÏ¿´À» ¶§°¡ °¡Àå ¼º´ÉÀÌ ÁÁ¾Ò´Ù.
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¿µ¹®³»¿ë (English Abstract) |
According to the network condition, the communication network overload could be occurred when media transmitting. Many researches are being carried out to lessen the network overload, such as the filtering, load distributing, frame dropping and many other methods. Among these methods, one of effective method is frame dropping that reduces specified video frames for bandwidth diminution. B frames are dropped and then I, P frames are dropped according to dependency among the frames in frame dropping.
This paper proposes a scheme for protecting copyrights by encryption, when we apply frame dropping to reduce bandwidth of media following MPEG-4 file format. We designed two kinds of frame dropping: first one stores and then sends the dropped files and the other drops frames in real-time when transmitting. We designed three kinds of encryption methods in which DES algorithm is used to encrypt MPEG-4 data: macro block encryption in I-VOP, macro block and motion vector encryption in P-VOP, and macro block and motion vector encryption in I, P-VOP. Based on these three methods, we implemented a digital right management solution for MPEG-4 data streaming.
We compared the results of dropping, encryption, decryption and quality of video sequences to select an optimal method, and there is no noticeable difference between the video sequences recovered after frame dropping and the ones recovered without frame dropping. The best performance in encryption and decryption of frames was obtained when we apply the macro block and motion vector encryption in I, P-VOP.
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Å°¿öµå(Keyword) |
MPEG(Moving Picture Experts Group)-4
ÇÁ·¹ÀÓ µå·ÎÇÎ(Frame Dropping)
¾ÏÈ£È(Encryption)
MPEG(Moving Picture Experts Group)-4
Frame Dropping
Encryption
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