{"id":1529,"date":"2013-04-13T12:38:38","date_gmt":"2013-04-13T05:38:38","guid":{"rendered":"http:\/\/thietbihoinghi.com.vn\/?p=1529"},"modified":"2015-08-05T11:54:42","modified_gmt":"2015-08-05T04:54:42","slug":"gioi-thieu-chuan-nen-hinh-anh-moi-h-264-svc","status":"publish","type":"post","link":"https:\/\/thietbihoinghi.com.vn\/en\/tin-tuc-su-kien\/gioi-thieu-chuan-nen-hinh-anh-moi-h-264-svc.htm","title":{"rendered":"Gi\u1edbi thi\u1ec7u chu\u1ea9n n\u00e9n h\u00ecnh \u1ea3nh m\u1edbi H.264 SVC"},"content":{"rendered":"

Ng\u00e0y nay, nhu c\u1ea7u h\u1ecdp h\u1ed9i ngh\u1ecb truy\u1ec1n h\u00ecn<\/a>h, c\u00e1c \u1ee9ng d\u1ee5ng truy\u1ec1n Video tr\u00ean m\u00f4i tr\u01b0\u1eddng Internet \u0111ang tr\u1edf n\u00ean r\u1ea5t ph\u1ed5 bi\u1ebfn. C\u00e1c \u0111i\u1ec3m c\u1ea7u ph\u00e1t v\u00e0 nh\u1eadn \u0111\u1eb7t t\u1ea1i c\u00e1c v\u1ecb tr\u1ecb kh\u00e1c nhau tr\u00ean Internet, s\u1eed d\u1ee5ng nh\u1eefng thi\u1ebft b\u1ecb v\u00e0 nh\u1eefng nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 kh\u00e1c nhau. Y\u00eau c\u1ea7u \u0111\u1eb7t ra \u0111\u1ed1i v\u1edbi chu\u1ea9n n\u00e9n h\u00ecnh \u1ea3nh hi\u1ec7n nay l\u00e0 ph\u1ea3i th\u00edch nghi c\u01a1 ch\u1ebf m\u00e3 h\u00f3a v\u1edbi c\u00e1c m\u00f4i tr\u01b0\u1eddng kh\u00e1c nhau. V\u1edbi l\u00fd do \u0111\u00f3, chu\u1ea9n n\u00e9n h\u00ecnh \u1ea3nh H.264 SVC \u0111\u00e3 \u0111\u01b0\u1ee3c ra \u0111\u1eddi v\u00e0 \u0111em l\u1ea1i nhi\u1ec1u \u01b0u \u0111i\u1ec3m n\u1ed5i tr\u1ed9i h\u01a1n h\u1eb3n so v\u1edbi chu\u1ea9n n\u00e9n ti\u1ec1n nhi\u1ec7m c\u1ee7a n\u00f3 l\u00e0 H.264 AVC.<\/p>\n

\u00a0\"Chuan
<\/a>Th\u1ebf n\u00e0o l\u00e0 m\u00e3 h\u00f3a m\u1edf r\u1ed9ng \u0111\u01b0\u1ee3c (SVC CODEC)<\/b><\/span><\/a><\/span><\/p>\n

T\u00ednh m\u1edf r\u1ed9ng \u0111\u01b0\u1ee3c c\u1ee7a thu\u1eadt to\u00e1n m\u00e3 h\u00f3a \u1edf \u0111\u00e2y c\u00f3 th\u1ec3 l\u00e0 vi\u1ec7c t\u1ef1 \u0111\u1ed9ng c\u1ea5u h\u00ecnh th\u00edch \u1ee9ng \u0111\u1ed1i v\u1edbi k\u00edch c\u1ee1 khung h\u00ecnh, t\u1ed1c \u0111\u1ed9 khung ho\u1eb7c t\u1ed1c \u0111\u1ed9 bit. D\u00f2ng d\u1eef li\u1ec7u h\u00ecnh \u1ea3nh \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh th\u00edch \u1ee9ng m\u1ed9t c\u00e1ch t\u1ef1 \u0111\u1ed9ng b\u1eb1ng vi\u1ec7c s\u1eed d\u1ee5ng m\u1ed9t k\u0129 thu\u1eadt g\u1ecdi l\u00e0 l\u00e0m m\u1ecfng l\u1edbp h\u00ecnh (layer thinning). Nh\u1edd \u0111\u00f3 m\u00e0 cho ph\u00e9p c\u00e1c thi\u1ebft b\u1ecb \u0111\u1ea7u cu\u1ed1i c\u0169ng nh\u01b0 c\u00e1c th\u00e0nh ph\u1ea7n tr\u00ean m\u1ea1ng c\u00f3 th\u1ec3 t\u00f9y ch\u1ec9nh c\u1ea5u h\u00ecnh d\u00f2ng d\u1eef li\u1ec7u h\u00ecnh \u1ea3nh ph\u00f9 h\u1ee3p v\u1edbi c\u1ea5u h\u00ecnh ph\u1ea7n c\u1ee9ng, ph\u1ea7n m\u1ec1m c\u1ee7a n\u00f3.<\/p>\n

M\u1ed9t d\u00f2ng d\u1eef li\u1ec7u h\u00ecnh \u1ea3nh \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a SVC bao g\u1ed3m 1 l\u1edbp h\u00ecnh c\u01a1 b\u1ea3n v\u00e0 c\u00e1c l\u1edbp h\u00ecnh m\u1edf r\u1ed9ng b\u00ean d\u01b0\u1edbi – h\u1ed7 tr\u1ee3 c\u00e1c \u0111\u1ecbnh d\u1ea1ng kh\u00e1c nhau. C\u00f3 3 ki\u1ec3u m\u00e3 h\u00f3a SVC c\u01a1 b\u1ea3n t\u01b0\u01a1ng \u1ee9ng v\u1edbi 3 th\u00f4ng s\u1ed1 c\u1ee7a d\u00f2ng d\u1eef li\u1ec7u h\u00ecnh \u1ea3nh:<\/p>\n

– M\u00e3 h\u00f3a th\u00edch \u1ee9ng kh\u00f4ng gian: m\u1ed9t d\u00f2ng d\u1eef li\u1ec7u h\u00ecnh \u1ea3nh bao g\u1ed3m nhi\u1ec1u l\u1edbp h\u00ecnh v\u1edbi c\u00e1c khung h\u00ecnh kh\u00e1c nhau.
– M\u00e3 h\u00f3a th\u00edch \u1ee9ng th\u1eddi gian: m\u1ed9t d\u00f2ng d\u1eef li\u1ec7u h\u00ecnh \u1ea3nh bao g\u1ed3m nhi\u1ec1u l\u1edbp h\u00ecnh v\u1edbi c\u00e1c t\u1ed1c \u0111\u1ed9 khung h\u00ecnh kh\u00e1c nhau.
– M\u00e3 h\u00f3a th\u00edch \u1ee9ng ch\u1ea5t l\u01b0\u1ee3ng: m\u1ed9t d\u00f2ng d\u1eef li\u1ec7u h\u00ecnh \u1ea3nh bao g\u1ed3m nhi\u1ec1u l\u1edbp h\u00ecnh v\u1edbi c\u00e1c t\u1ed1c \u0111\u1ed9 bit ( t\u01b0\u01a1ng \u1ee9ng v\u1edbi SNR) kh\u00e1c nhau.<\/p>\n

Gi\u1edbi thi\u1ec7u chu\u1ea9n n\u00e9n h\u00ecnh \u1ea3nh H.264 SVC<\/b><\/span><\/p>\n

C\u00f4ng ngh\u1ec7 n\u00e9n h\u00ecnh \u1ea3nh H.264 SVC \u0111em l\u1ea1i nhi\u1ec1u \u01b0u \u0111i\u1ec3m v\u01b0\u1ee3t so v\u1edbi chu\u1ea9n n\u00e9n ti\u1ec1n th\u00e2n c\u1ee7a n\u00f3 nh\u01b0:
– Cho hi\u1ec7u su\u1ea5t m\u00e3 h\u00f3a vao h\u01a1n so khi m\u00e3 h\u00f3a nhi\u1ec1u l\u1edbp d\u1eef li\u1ec7u h\u00ecnh \u1ea3nh.
– H\u1ed7 tr\u1ee3 m\u00e3 h\u00f3a th\u00edch \u1ee9ng kh\u00f4ng gian, th\u1eddi gian v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng. T\u1eeb \u0111\u00f3 c\u00f3 th\u1ec3 t\u01b0\u01a1ng th\u00edch v\u1edbi c\u00e1c thi\u1ebft b\u1ecb \u0111\u1ea7u cu\u1ed1i c\u00f3 c\u1ea5u h\u00ecnh kh\u00e1c nhau.
– T\u01b0\u01a1ng th\u00edch ng\u01b0\u1ee3c v\u1edbi c\u00e1c chu\u1ea9n n\u00e9n ti\u1ec1n th\u00e2n kh\u00e1c c\u1ee7a n\u00f3 (H.264 AVC).
– H\u1ed7 tr\u1ee3 \u0111i\u1ec1u khi\u1ec3n th\u00edch \u1ee9ng \u0111\u1ed1i v\u1edbi 1 d\u00f2ng d\u1eef li\u1ec7u truy\u1ec1n t\u1ea3i duy nh\u1ea5t sau khi h\u00ecnh \u1ea3nh \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a.
– Cung c\u1ea5p kh\u1ea3 n\u0103ng s\u1eeda l\u1ed7i khi d\u00f2ng d\u1eef li\u1ec7u truy\u1ec1n t\u1ea3i b\u1ecb m\u1ea5t g\u00f3i hay rung pha l\u1edbn. Kh\u1ea3 n\u0103ng ch\u1ecbu m\u1ea5t g\u00f3i l\u1edbn nh\u1ea5t c\u1ee7a c\u00f4ng ngh\u1ec7 n\u00e0y l\u00ean t\u1edbi 40%, trong khi c\u00f4ng ngh\u1ec7 m\u00e3 h\u00f3a AVC cao nh\u1ea5t c\u0169ng ch\u1ec9 l\u00e0 5%.
– H\u1ed7 tr\u1ee3 k\u1ebft n\u1ed1i t\u01b0\u01a1ng th\u00edch \u0111a \u0111i\u1ec3m, \u0111a ch\u1ee7ng lo\u1ea1i, \u0111a c\u1ea5u h\u00ecnh c\u1ee7a thi\u1ebft b\u1ecb \u0111\u1ea7u cu\u1ed1i trong c\u00e1c c\u00e1c \u1ee9ng d\u1ee5ng \u0111i\u1ec7n to\u00e1n \u0111\u00e1m m\u00e2y.<\/p>\n

K\u1ebft lu\u1eadn<\/b><\/span><\/p>\n

C\u00f4ng ngh\u1ec7 m\u00e3 h\u00f3a h\u00ecnh \u1ea3nh m\u1edf r\u1ed9ng \u0111\u01b0\u1ee3c n\u00f3i chung v\u00e0 thu\u1eadt to\u00e1n m\u00e3 h\u00f3a H.264 SVC n\u00f3i ri\u00eang \u0111em l\u1ea1i nhi\u1ec1u \u01b0u \u0111i\u1ec3m v\u01b0\u1ee3t tr\u1ed9i cho c\u00e1c \u1ee9ng d\u1ef1ng h\u00ecnh \u1ea3nh tr\u1ef1c tuy\u1ebfn trong m\u00f4i tr\u01b0\u1eddng Internet ng\u00e0y nay nh\u01b0 h\u1ed9i ngh\u1ecb truy\u1ec1n h\u00ecnh<\/a>, camera gi\u00e1m s\u00e1t, telemedecine … thu\u1eadt to\u00e1n m\u00e3 h\u00f3a H.264 SVC s\u1ebd l\u00e0 xu h\u01b0\u1edbng c\u1ee7a c\u00f4ng ngh\u1ec7 n\u00e9n h\u00ecnh \u1ea3nh trong th\u1eddi gian t\u1edbi.<\/p>\n

\u00a0SAVITEL – Nh\u00e0 cung c\u1ea5p thi\u1ebft b\u1ecb h\u1ed9i ngh\u1ecb truy\u1ec1n h\u00ecnh chuy\u00ean nghi\u1ec7p<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Ng\u00e0y nay, nhu c\u1ea7u h\u1ecdp h\u1ed9i ngh\u1ecb truy\u1ec1n h\u00ecnh, c\u00e1c \u1ee9ng d\u1ee5ng truy\u1ec1n Video tr\u00ean m\u00f4i tr\u01b0\u1eddng Internet \u0111ang tr\u1edf n\u00ean r\u1ea5t ph\u1ed5 bi\u1ebfn. C\u00e1c \u0111i\u1ec3m c\u1ea7u ph\u00e1t v\u00e0 nh\u1eadn \u0111\u1eb7t t\u1ea1i c\u00e1c v\u1ecb tr\u1ecb kh\u00e1c nhau tr\u00ean Internet, s\u1eed d\u1ee5ng nh\u1eefng thi\u1ebft b\u1ecb v\u00e0 nh\u1eefng nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 kh\u00e1c nhau. Y\u00eau c\u1ea7u … <\/p>\n

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