{"id":13207,"date":"2017-06-05T03:53:55","date_gmt":"2017-06-05T03:53:55","guid":{"rendered":"https:\/\/electronics-bloger.com\/?p=13207"},"modified":"2025-07-24T07:21:46","modified_gmt":"2025-07-24T07:21:46","slug":"tai-sao-camera-o-to-chi-co-03-trieu-pixel-trong-khi-camera-dien-thoai-di-dong-co-the-len-den-hang-trieu-pixel","status":"publish","type":"post","link":"https:\/\/luview.com\/vi\/why-car-camera-pixels-only-0-3-million-while-cellphone-camera-up-to-millions\/","title":{"rendered":"T\u1ea1i sao \u0111\u1ed9 ph\u00e2n gi\u1ea3i c\u1ee7a camera \u00f4 t\u00f4 ch\u1ec9 0,3 tri\u1ec7u pixel trong khi camera \u0111i\u1ec7n tho\u1ea1i di \u0111\u1ed9ng c\u00f3 th\u1ec3 l\u00ean \u0111\u1ebfn h\u00e0ng tri\u1ec7u pixel?"},"content":{"rendered":"

Hi\u1ec7n nay, vi\u1ec7c m\u1ed9t chi\u1ebfc \u0111i\u1ec7n tho\u1ea1i di \u0111\u1ed9ng \u0111\u01b0\u1ee3c trang b\u1ecb camera c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i 8 tri\u1ec7u, 12 tri\u1ec7u ho\u1eb7c th\u1eadm ch\u00ed 20 tri\u1ec7u pixel l\u00e0 \u0111i\u1ec1u r\u1ea5t ph\u1ed5 bi\u1ebfn. Tuy nhi\u00ean, khi n\u00f3i \u0111\u1ebfn camera \u00f4 t\u00f4, ch\u00fang ta c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng \u0111i\u1ec1u n\u00e0y kh\u00f4ng ph\u1ea3i l\u00e0 \u0111i\u1ec1u b\u00ecnh th\u01b0\u1eddng. Camera l\u00f9i xe<\/a> Ch\u1ec9 v\u1edbi 0,3 tri\u1ec7u pixel, m\u1ed9t Camera \u00f4 t\u00f4<\/a> M\u1ed9t camera c\u00f3 m\u1ed9t tri\u1ec7u pixel \u0111\u01b0\u1ee3c coi l\u00e0 camera HD, t\u1ea1i sao?<\/p>\n

\"T\u1ea1i<\/p>\n

L\u00fd do ch\u00ednh l\u00e0 ng\u00e0nh c\u00f4ng nghi\u1ec7p \u00f4 t\u00f4 truy\u1ec1n th\u1ed1ng c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m \u201cch\u1eadm ch\u1ea1p\u201d, b\u1ea5t k\u1ef3 c\u00f4ng ngh\u1ec7 hay s\u1ea3n ph\u1ea9m m\u1edbi n\u00e0o mu\u1ed1n \u00e1p d\u1ee5ng v\u00e0o \u00f4 t\u00f4 \u0111\u1ec1u ph\u1ea3i tr\u1ea3i qua m\u1ed9t qu\u00e1 tr\u00ecnh nghi\u00ean c\u1ee9u v\u00e0 ph\u00e1t tri\u1ec3n (R&D) c\u00f9ng ki\u1ec3m \u0111\u1ecbnh k\u00e9o d\u00e0i. Trong khi \u0111i\u1ec7n tho\u1ea1i c\u00f3 th\u1ec3 thay \u0111\u1ed5i th\u1ebf h\u1ec7 m\u1ed7i n\u0103m, \u00f4 t\u00f4 c\u1ea7n \u00edt nh\u1ea5t n\u0103m n\u0103m. T\u1ea5t nhi\u00ean, cu\u1ed1i c\u00f9ng \u0111i\u1ec1u n\u00e0y c\u00f2n ph\u1ee5 thu\u1ed9c v\u00e0o th\u1ecb tr\u01b0\u1eddng v\u00e0 chi ph\u00ed. \u0110\u00e2y l\u00e0 c\u00e2u tr\u1ea3 l\u1eddi chung cho c\u00e2u h\u1ecfi n\u00e0y.<\/p>\n

T\u1eeb g\u00f3c \u0111\u1ed9 k\u1ef9 thu\u1eadt, d\u00f9 l\u00e0 nhi\u1ec7t \u0111\u1ed9 cao hay th\u1ea5p, rung \u0111\u1ed9ng, v\u1ea5n \u0111\u1ec1 EMC, v.v., \u0111\u1ec1u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ea7y \u0111\u1ee7 theo y\u00eau c\u1ea7u c\u1ee7a xe. Camera \u0111i\u1ec7n tho\u1ea1i di \u0111\u1ed9ng s\u1eed d\u1ee5ng chip gi\u00e1 r\u1ebb d\u00e0nh cho ng\u01b0\u1eddi ti\u00eau d\u00f9ng, vi\u1ec7c thay th\u1ebf b\u1eb1ng chip c\u1ea5p xe tr\u00ean xe l\u00e0 ho\u00e0n to\u00e0n kh\u1ea3 thi.<\/p>\n

V\u00ec v\u1ea5n \u0111\u1ec1 k\u1ef9 thu\u1eadt kh\u00f4ng ph\u1ea3i l\u00e0 v\u1ea5n \u0111\u1ec1, v\u1eady t\u1ea1i sao \u0111\u1ed9 ph\u00e2n gi\u1ea3i c\u1ee7a camera \u00f4 t\u00f4 v\u1eabn c\u00f2n th\u1ea5p nh\u01b0 v\u1eady?<\/p>\n

M\u1ed9t h\u1ec7 th\u1ed1ng camera ho\u00e0n ch\u1ec9nh n\u00ean bao g\u1ed3m camera (ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c coi l\u00e0 c\u1ea3m bi\u1ebfn video\/h\u00ecnh \u1ea3nh), h\u1ec7 th\u1ed1ng truy\u1ec1n d\u1eabn video (bao g\u1ed3m CVBS, LVDS v\u00e0 Ethernet) v\u00e0 thi\u1ebft b\u1ecb hi\u1ec3n th\u1ecb (m\u00e0n h\u00ecnh LCD).<\/p>\n

Th\u1ee9 nh\u1ea5t<\/strong>, C\u1ea3m bi\u1ebfn camera: Hi\u1ec7n t\u1ea1i, c\u1ea3m bi\u1ebfn camera \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u ti\u00eau chu\u1ea9n cho \u00f4 t\u00f4 v\u00e0 \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t h\u00e0ng lo\u1ea1t ch\u1ee7 y\u1ebfu l\u00e0 camera 0,3 tri\u1ec7u pixel (\u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong h\u1ea7u h\u1ebft c\u00e1c xe \u00f4 t\u00f4) v\u00e0 camera 720P (v\u1edbi kho\u1ea3ng 1 tri\u1ec7u pixel), hai lo\u1ea1i. C\u1ea3m bi\u1ebfn h\u00ecnh \u1ea3nh 720P ch\u1ec9 m\u1edbi ph\u00e1t tri\u1ec3n ho\u00e0n thi\u1ec7n trong nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y. Hi\u1ec7n nay, gi\u00e1 c\u1ee7a hai lo\u1ea1i c\u1ea3m bi\u1ebfn h\u00ecnh \u1ea3nh n\u00e0y ch\u00eanh l\u1ec7ch kho\u1ea3ng ba l\u1ea7n. Y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u00e1p \u1ee9ng, nh\u01b0ng chi ph\u00ed cu\u1ed1i c\u00f9ng s\u1ebd t\u0103ng \u0111\u00e1ng k\u1ec3.<\/p>\n

Th\u1ee9 hai<\/strong>, qu\u00e1 tr\u00ecnh truy\u1ec1n t\u1ea3i:
\n\u0110\u1ecbnh ngh\u0129a ti\u00eau chu\u1ea9n: C\u00e1c camera ch\u1ea5t l\u01b0\u1ee3ng ti\u00eau chu\u1ea9n hi\u1ec7n nay s\u1eed d\u1ee5ng \u0111\u1ecbnh d\u1ea1ng t\u00edn hi\u1ec7u CVBS \u0111\u1ec3 truy\u1ec1n t\u1ea3i. CVBS c\u00f3 th\u1ec3 \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng c\u00e1ch \u0111\u00e2y kho\u1ea3ng hai m\u01b0\u01a1i n\u0103m tr\u00ean truy\u1ec1n h\u00ecnh c\u00e1p t\u1ea1i gia \u0111\u00ecnh. \u0110\u1ed9 ph\u00e2n gi\u1ea3i truy\u1ec1n t\u1ea3i l\u00fd thuy\u1ebft ch\u1ec9 v\u00e0i tr\u0103m ngh\u00ecn pixel. Ph\u01b0\u01a1ng ph\u00e1p truy\u1ec1n t\u1ea3i n\u00e0y r\u1ea5t\u6210\u719f v\u00e0 \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong \u00f4 t\u00f4 t\u1eeb l\u00e2u, kh\u00f4ng c\u00f3 v\u1ea5n \u0111\u1ec1 g\u00ec. T\u00edn hi\u1ec7u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy\u1ec1n tr\u1ef1c ti\u1ebfp \u0111\u1ebfn \u0111\u1ea7u ra c\u1ea3m bi\u1ebfn h\u00ecnh \u1ea3nh, kh\u00f4ng c\u1ea7n chip m\u00e3 h\u00f3a b\u1ed5 sung, nh\u01b0ng c\u00f3 y\u00eau c\u1ea7u th\u1ea5p \u0111\u1ed1i v\u1edbi c\u00e1p truy\u1ec1n t\u1ea3i. \u01afu \u0111i\u1ec3m c\u1ee7a n\u00f3 l\u00e0 chi ph\u00ed th\u1ea5p v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh cao. \u0110i\u1ec1u quan tr\u1ecdng nh\u1ea5t l\u00e0 h\u1ea7u h\u1ebft c\u00e1c giao di\u1ec7n \u0111\u1ea7u v\u00e0o d\u1ef1 ph\u00f2ng c\u1ee7a m\u00e0n h\u00ecnh LCD c\u0169ng l\u00e0 CVBS.
\n\u0110\u1ed9 ph\u00e2n gi\u1ea3i cao: bao g\u1ed3m hai lo\u1ea1i LVDS v\u00e0 Ethernet. Chip m\u00e3 h\u00f3a LVDS \u0111\u1ea7u ti\u00ean kh\u00f4ng r\u1ebb, d\u00e2y c\u00e1p c\u0169ng r\u1ea5t \u0111\u1eaft, v\u00e0 ch\u1ec9 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong camera trong nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y. B\u1ed9 \u0111i\u1ec1u khi\u1ec3n Ethernet cho \u00f4 t\u00f4 (PHY) c\u0169ng r\u1ea5t \u0111\u1eaft, nh\u01b0ng kh\u00f4ng y\u00eau c\u1ea7u d\u00e2y c\u00e1p. M\u1eb7c d\u00f9 Ethernet trong l\u0129nh v\u1ef1c d\u00e2n d\u1ee5ng \u0111\u00e3 ph\u00e1t tri\u1ec3n\u6210\u719f, nh\u01b0ng trong ng\u00e0nh \u00f4 t\u00f4 ch\u1ec9 c\u00f3 m\u1ed9t s\u1ed1 nh\u00e0 s\u1ea3n xu\u1ea5t \u00f4 t\u00f4 n\u1ed5i ti\u1ebfng nh\u01b0 BMW d\u00e1m s\u1eed d\u1ee5ng.<\/p>\n

Th\u1ee9 ba<\/strong>, m\u00e0n h\u00ecnh, v\u1ea5n \u0111\u1ec1 v\u1eabn n\u1eb1m \u1edf giao di\u1ec7n video, v\u00ec h\u1ea7u h\u1ebft c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t m\u00e0n h\u00ecnh \u0111\u1ec1u d\u00e0nh giao di\u1ec7n cho camera \u00f4 t\u00f4 l\u00e0 CVBS, ch\u1ec9 c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng camera c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i 0,3 tri\u1ec7u pixel. \u0110\u1ec3 hi\u1ec3n th\u1ecb camera 720P, b\u1ea1n ph\u1ea3i s\u1eed d\u1ee5ng giao di\u1ec7n video LVDS ho\u1eb7c Ethernet. C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t camera v\u00e0 m\u00e0n h\u00ecnh th\u01b0\u1eddng kh\u00f4ng thu\u1ed9c c\u00f9ng m\u1ed9t c\u00f4ng ty, v\u00ec v\u1eady h\u1ecd s\u1ebd kh\u00f4ng t\u1ef1 \u00fd thay \u0111\u1ed5i cho b\u1ea1n. Ch\u1ec9 c\u00f3 nh\u00e0 s\u1ea3n xu\u1ea5t \u00f4 t\u00f4 m\u1edbi c\u00f3 th\u1ec3 th\u00fac \u0111\u1ea9y vi\u1ec7c thay \u0111\u1ed5i n\u00e0y, v\u00e0 c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t \u00f4 t\u00f4 r\u1ea5t nh\u1ea1y c\u1ea3m v\u1edbi vi\u1ec7c s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 m\u1edbi v\u00e0 chi ph\u00ed. Tr\u1eeb khi t\u1ea5t c\u1ea3 c\u00e1c \u0111\u1ed1i th\u1ee7 c\u1ea1nh tranh \u0111\u1ec1u s\u1eed d\u1ee5ng, th\u00ec h\u1ecd m\u1edbi nghi\u00eam t\u00fac xem x\u00e9t. Th\u1ef1c t\u1ebf, c\u00f4ng ty ch\u00fang t\u00f4i \u0111\u00e3 ph\u00e1t tri\u1ec3n camera \u00f4 t\u00f4 720P c\u00e1ch \u0111\u00e2y hai n\u0103m, nh\u01b0ng cho \u0111\u1ebfn nay v\u1eabn c\u00f3 r\u1ea5t \u00edt nh\u00e0 s\u1ea3n xu\u1ea5t \u00f4 t\u00f4 trong n\u01b0\u1edbc th\u1ef1c s\u1ef1 c\u00f3 \u00fd \u0111\u1ecbnh s\u1eed d\u1ee5ng n\u00f3.<\/p>\n

V\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt, th\u1ef1c s\u1ef1 kh\u00f4ng c\u00f3 v\u1ea5n \u0111\u1ec1 g\u00ec, v\u1ea5n \u0111\u1ec1 l\u00e0 nh\u00e0 s\u1ea3n xu\u1ea5t \u00f4 t\u00f4 kh\u00f4ng mu\u1ed1n \u0111\u1ea7u t\u01b0 nhi\u1ec1u nh\u00e2n l\u1ef1c v\u00e0 chi ph\u00ed nh\u01b0 v\u1eady. \u0110\u1ed1i v\u1edbi c\u00e1c c\u00f4ng ngh\u1ec7 v\u00e0 s\u1ea3n ph\u1ea9m m\u1edbi, n\u00f3i chung, Ch\u00e2u \u00c2u v\u00e0 M\u1ef9 c\u00f3 th\u1ec3 th\u1eed nghi\u1ec7m tr\u01b0\u1edbc tr\u00ean c\u00e1c d\u00f2ng xe sang, sau \u0111\u00f3 \u00e1p d\u1ee5ng cho xe d\u00e2n d\u1ee5ng, v\u00e0 cu\u1ed1i c\u00f9ng \u0111\u01b0a v\u00e0o th\u1ecb tr\u01b0\u1eddng Trung Qu\u1ed1c th\u00f4ng qua c\u00e1c li\u00ean doanh t\u1ea1i Trung Qu\u1ed1c.Hi\u1ec7n nay, nhi\u1ec1u xe sang \u1edf ch\u00e2u \u00c2u v\u00e0 M\u1ef9 \u0111\u00e3 s\u1eed d\u1ee5ng camera \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao 720p, v\u00e0 t\u00f4i \u0111o\u00e1n ph\u1ea3i m\u1ea5t kho\u1ea3ng 5 n\u0103m n\u1eefa m\u1edbi ph\u1ed5 bi\u1ebfn trong ph\u00e2n kh\u00fac xe d\u00e2n d\u1ee5ng \u1edf Trung Qu\u1ed1c v\u00e0 c\u00e1c n\u01b0\u1edbc \u0111ang ph\u00e1t tri\u1ec3n kh\u00e1c, v\u00ec v\u1eady ch\u00fang ta h\u00e3y ch\u1edd \u0111\u1ee3i. Nh\u1eefng ng\u01b0\u1eddi kh\u00f4ng th\u1ec3 ch\u1edd \u0111\u1ee3i \u0111\u1ec3 mua c\u00f3 th\u1ec3 mua camera l\u00f9i 720p t\u1eeb th\u1ecb tr\u01b0\u1eddng ph\u1ee5 t\u00f9ng v\u00e0 s\u1eed d\u1ee5ng m\u00e0n h\u00ecnh t\u01b0\u01a1ng th\u00edch v\u1edbi camera HD n\u00e0y.<\/p>","protected":false},"excerpt":{"rendered":"

Currently,it is very common for a cellphone with a 8 million, 12 million or even 20 million pixels camera,but when it turn to car camera, we may found the normal reverse car camera only with 0.3 million pixels, a car camera with one million pixels was regarded as HD camera,why ? The main reason is […]<\/p>\n","protected":false},"author":1,"featured_media":23905,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[52],"tags":[],"class_list":["post-13207","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-news"],"_links":{"self":[{"href":"https:\/\/luview.com\/vi\/wp-json\/wp\/v2\/posts\/13207","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/luview.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/luview.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/luview.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/luview.com\/vi\/wp-json\/wp\/v2\/comments?post=13207"}],"version-history":[{"count":0,"href":"https:\/\/luview.com\/vi\/wp-json\/wp\/v2\/posts\/13207\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/luview.com\/vi\/wp-json\/wp\/v2\/media\/23905"}],"wp:attachment":[{"href":"https:\/\/luview.com\/vi\/wp-json\/wp\/v2\/media?parent=13207"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/luview.com\/vi\/wp-json\/wp\/v2\/categories?post=13207"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/luview.com\/vi\/wp-json\/wp\/v2\/tags?post=13207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}