{"id":3694,"date":"2026-01-27T03:56:43","date_gmt":"2026-01-27T03:56:43","guid":{"rendered":"https:\/\/ni-mech.com\/?p=3694"},"modified":"2026-01-27T04:00:07","modified_gmt":"2026-01-27T04:00:07","slug":"bao-cao-kiem-tra-suc-khoe-cua-cac-mo-dun-hien-thi","status":"publish","type":"post","link":"https:\/\/ni-mech.com\/vi\/bao-cao-kiem-tra-suc-khoe-cua-cac-mo-dun-hien-thi\/","title":{"rendered":"B\u00e1o c\u00e1o Ki\u1ec3m tra S\u1ee9c kh\u1ecfe c\u1ee7a C\u00e1c m\u00f4-\u0111un Vision"},"content":{"rendered":"

Hi\u1ec3u r\u00f5 v\u1ec1 ki\u1ec3m tra MTF v\u00e0 SFR trong m\u1ed9t b\u00e0i vi\u1ebft<\/h2>\n

Trong ph\u00f2ng t\u1ed1i c\u1ee7a m\u1ed9t ph\u00f2ng th\u00ed nghi\u1ec7m ki\u1ec3m tra, camera c\u1ee7a m\u1ed9t chi\u1ebfc smartphone h\u01b0\u1edbng v\u1ec1 m\u1ed9t b\u1ea3ng th\u1eed nghi\u1ec7m c\u00f3 c\u1ea1nh nghi\u00eang \u0111\u01b0\u1ee3c chi\u1ebfu s\u00e1ng c\u1ea9n th\u1eadn. M\u1ed9t k\u1ef9 s\u01b0 nh\u1ea5n n\u00fat ph\u00e2n t\u00edch, v\u00e0 m\u1ed9t \u0111\u01b0\u1eddng cong m\u01b0\u1ee3t m\u00e0 l\u1eadp t\u1ee9c xu\u1ea5t hi\u1ec7n tr\u00ean m\u00e0n h\u00ecnh\u2014t\u1eeb cao xu\u1ed1ng th\u1ea5p\u2014d\u1ef1 \u0111o\u00e1n ch\u00ednh x\u00e1c m\u1ee9c \u0111\u1ed9 r\u00f5 n\u00e9t m\u00e0 camera n\u00e0y s\u1ebd ghi l\u1ea1i th\u1ebf gi\u1edbi.<\/p>\n

Khi \u0111\u00e1nh gi\u00e1 m\u1ed9t m\u00e1y \u1ea3nh, \u1ed1ng k\u00ednh ho\u1eb7c th\u1eadm ch\u00ed c\u1ea3 h\u1ec7 th\u1ed1ng h\u00ecnh \u1ea3nh, \u0111\u1ed9 s\u1eafc n\u00e9t<\/strong> th\u01b0\u1eddng l\u00e0 y\u00eau c\u1ea7u tr\u1ef1c quan nh\u1ea5t. Nh\u01b0ng l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i nh\u1eadn th\u1ee9c th\u1ecb gi\u00e1c ch\u1ee7 quan n\u00e0y th\u00e0nh D\u1eef li\u1ec7u kh\u00e1ch quan, c\u00f3 th\u1ec3 l\u1eb7p l\u1ea1i v\u00e0 khoa h\u1ecdc.<\/strong>?<\/p>\n

\u0110\u00e2y ch\u00ednh x\u00e1c l\u00e0 vai tr\u00f2 c\u1ee7a H\u00e0m truy\u1ec1n t\u1ea3i \u0111i\u1ec1u ch\u1ebf (MTF)<\/strong> v\u00e0 Ph\u1ea3n \u1ee9ng t\u1ea7n s\u1ed1 kh\u00f4ng gian (SFR)<\/strong>. H\u1ecd l\u00e0 ng\u00f4n ng\u1eef ph\u1ed5 qu\u00e1t<\/em> c\u1ee7a quang h\u1ecdc v\u00e0 h\u00ecnh \u1ea3nh, v\u00e0 ti\u00eau chu\u1ea9n v\u00e0ng<\/strong> \u0110\u1ec3 \u0111\u00e1nh gi\u00e1 \u0111\u1ecbnh l\u01b0\u1ee3ng \u0111\u1ed9 s\u1eafc n\u00e9t v\u00e0 kh\u1ea3 n\u0103ng t\u00e1i t\u1ea1o chi ti\u1ebft c\u1ee7a h\u00ecnh \u1ea3nh trong c\u00e1c m\u00f4-\u0111un th\u1ecb gi\u00e1c.<\/p>\n

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01 Kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n: T\u1eeb m\u1edd nh\u1ea1t \u0111\u1ebfn \u0111\u1ecbnh l\u01b0\u1ee3ng<\/h2>\n

MTF l\u00e0 g\u00ec?<\/h3>\n

N\u00f3i m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n, MTF \u0111o l\u01b0\u1eddng \u201c\u0111\u1ed9 ch\u00ednh x\u00e1c\u201d c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng h\u00ecnh \u1ea3nh.<\/strong>. N\u00f3 m\u00f4 t\u1ea3 kh\u1ea3 n\u0103ng t\u00e1i t\u1ea1o \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n c\u1ee7a c\u00e1c m\u1eabu \u0111\u01b0\u1eddng n\u00e9t \u0111en tr\u1eafng \u1edf c\u00e1c m\u1ee9c \u0111\u1ed9 tinh t\u1ebf kh\u00e1c nhau (t\u1ea7n s\u1ed1 kh\u00f4ng gian) c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

C\u00f4ng th\u1ee9c \u0111i\u1ec1u ch\u1ebf c\u01a1 b\u1ea3n l\u00e0:<\/p>\n

M = (Imax \u2212 Imin) \/ (Imax + Imin)<\/strong><\/p>\n

Gi\u00e1 tr\u1ecb MTF \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a l\u00e0 t\u1ef7 l\u1ec7 gi\u1eefa \u0111\u1ed9 \u0111i\u1ec1u ch\u1ebf h\u00ecnh \u1ea3nh v\u00e0 \u0111\u1ed9 \u0111i\u1ec1u ch\u1ebf c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng g\u1ed1c.
Gi\u00e1 tr\u1ecb MTF l\u00fd t\u01b0\u1edfng l\u00e0 1<\/strong> \u0111\u1ea1i di\u1ec7n cho s\u1ef1 t\u00e1i t\u1ea1o ho\u00e0n h\u1ea3o.<\/p>\n

Trong qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m, t\u1ea7n s\u1ed1 kh\u00f4ng gian \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng S\u1ed1 c\u1eb7p \u0111\u01b0\u1eddng tr\u00ean m\u1ed7i milimet (lp\/mm)<\/strong> v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 \u0111\u1ed9 m\u1ecbn<\/em> Chi ti\u1ebft h\u00ecnh \u1ea3nh. T\u1ea7n s\u1ed1 kh\u00f4ng gian cao h\u01a1n t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e1c \u0111\u01b0\u1eddng n\u00e9t d\u00e0y \u0111\u1eb7c h\u01a1n v\u00e0 chi ti\u1ebft tinh t\u1ebf h\u01a1n.<\/p>\n

M\u1ed9t quy t\u1eafc chung \u00e1p d\u1ee5ng: Khi t\u1ea7n s\u1ed1 kh\u00f4ng gian t\u0103ng, MTF th\u01b0\u1eddng gi\u1ea3m.<\/strong>, v\u00ec kh\u1ea3 n\u0103ng t\u00e1i t\u1ea1o chi ti\u1ebft c\u1ef1c k\u1ef3 nh\u1ecf c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng h\u00ecnh \u1ea3nh lu\u00f4n b\u1ecb gi\u1edbi h\u1ea1n.<\/p>\n

V\u00ed d\u1ee5:<\/p>\n

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  • \n

    T\u1ea1i 20 lp\/mm<\/strong>, gi\u00e1 tr\u1ecb MTF l\u1edbn h\u01a1n 80%<\/strong> Cho th\u1ea5y ch\u1ea5t l\u01b0\u1ee3ng h\u00ecnh \u1ea3nh xu\u1ea5t s\u1eafc.<\/p>\n<\/li>\n

  • \n

    N\u1ebfu MTF gi\u1ea3m xu\u1ed1ng d\u01b0\u1edbi 30%<\/strong>, Ch\u1ea5t l\u01b0\u1ee3ng h\u00ecnh \u1ea3nh \u0111\u00e3 k\u00e9m ngay c\u1ea3 \u1edf k\u00edch th\u01b0\u1edbc in ti\u00eau chu\u1ea9n.<\/p>\n<\/li>\n<\/ul>\n

    \n

    SFR l\u00e0 g\u00ec?<\/h3>\n

    SFR th\u01b0\u1eddng \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 l\u00e0 \u201cphi\u00ean b\u1ea3n k\u1ef9 thu\u1eadt s\u1ed1\u201d c\u1ee7a MTF<\/strong>. N\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 \u0111\u00e1nh gi\u00e1. H\u1ec7 th\u1ed1ng h\u00ecnh \u1ea3nh k\u1ef9 thu\u1eadt s\u1ed1 ho\u00e0n ch\u1ec9nh<\/strong>, bao g\u1ed3m c\u1ea3 Th\u1ea5u k\u00ednh, c\u1ea3m bi\u1ebfn h\u00ecnh \u1ea3nh v\u00e0 x\u1eed l\u00fd t\u00edn hi\u1ec7u h\u00ecnh \u1ea3nh (ISP)<\/strong>.<\/p>\n

    M\u1ee5c ti\u00eau c\u1ee7a SFR l\u00e0 chuy\u1ec3n \u0111\u1ed5i \u201c\u0111\u1ed9 s\u1eafc n\u00e9t\u201d m\u00e0 con ng\u01b0\u1eddi c\u1ea3m nh\u1eadn th\u00e0nh c\u00e1c th\u00f4ng s\u1ed1 v\u1eadt l\u00fd c\u00f3 th\u1ec3 \u0111o l\u01b0\u1eddng \u0111\u01b0\u1ee3c.<\/p>\n

    SFR ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch ph\u00e2n t\u00edch ph\u1ea3n \u1ee9ng c\u1ee7a h\u1ec7 th\u1ed1ng h\u00ecnh \u1ea3nh \u0111\u1ed1i v\u1edbi m\u1ed9t m\u00e9p nghi\u00eang s\u1eafc nh\u1ecdn<\/strong>, T\u1eeb \u0111\u00f3, c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111\u00e1p \u1ee9ng t\u1ea7n s\u1ed1 t\u1ed5ng th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

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    02 Nguy\u00ean l\u00fd v\u1eadt l\u00fd: C\u00e1ch c\u00e1c chi ti\u1ebft b\u1ecb m\u1ea5t<\/h2>\n

    T\u1ea1i sao h\u00ecnh \u1ea3nh b\u1ecb m\u1edd? T\u1eeb g\u00f3c \u0111\u1ed9 v\u1eadt l\u00fd, s\u1ef1 suy gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng h\u00ecnh \u1ea3nh trong h\u1ec7 th\u1ed1ng x\u1eed l\u00fd h\u00ecnh \u1ea3nh k\u1ef9 thu\u1eadt s\u1ed1 xu\u1ea5t ph\u00e1t t\u1eeb nhi\u1ec1u y\u1ebfu t\u1ed1, c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i th\u00e0nh ba nh\u00f3m ch\u00ednh:<\/p>\n

    H\u1ea1n ch\u1ebf ph\u1ea7n c\u1ee9ng<\/h3>\n
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    • \n

      Th\u1ea5u k\u00ednh v\u1ed1n d\u0129 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi c\u00e1c sai s\u1ed1 h\u00ecnh h\u1ecdc c\u00f2n l\u1ea1i v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng nhi\u1ec5u x\u1ea1.<\/p>\n<\/li>\n

    • \n

      K\u00edch th\u01b0\u1edbc l\u1ed7 m\u1edf c\u1ee7a pixel c\u1ea3m bi\u1ebfn v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng nhi\u1ec5u \u0111i\u1ec7n gi\u1eefa c\u00e1c pixel d\u1eabn \u0111\u1ebfn m\u1ea5t chi ti\u1ebft.<\/p>\n<\/li>\n<\/ul>\n

      T\u00e1c \u0111\u1ed9ng c\u1ee7a thu\u1eadt to\u00e1n ph\u1ea7n m\u1ec1m<\/h3>\n

      \u0110\u1ec3 t\u1ea1o ra nh\u1eefng h\u00ecnh \u1ea3nh \u0111\u1eb9p m\u1eaft h\u01a1n, c\u00e1c thu\u1eadt to\u00e1n nh\u01b0 gi\u1ea3m nhi\u1ec5u, l\u00e0m \u0111\u1eb9p v\u00e0 l\u00e0m m\u1edd n\u1ec1n ch\u1ee7 \u0111\u1ed9ng \u0111i\u1ec1u ch\u1ec9nh d\u1eef li\u1ec7u pixel. Trong qu\u00e1 tr\u00ecnh gi\u1ea3m nhi\u1ec5u, ch\u00fang th\u01b0\u1eddng... Lo\u1ea1i b\u1ecf c\u00e1c chi ti\u1ebft tinh t\u1ebf th\u1ef1c s\u1ef1<\/strong>.<\/p>\n

      \u1ea2nh h\u01b0\u1edfng c\u1ee7a m\u00f4i tr\u01b0\u1eddng<\/h3>\n

      Rung m\u00e1y \u1ea3nh, nhi\u1ec5u kh\u00ed quy\u1ec3n v\u00e0 \u00e1nh s\u00e1ng l\u1ea1c d\u01b0\u1edbi \u0111i\u1ec1u ki\u1ec7n chi\u1ebfu s\u00e1ng m\u1ea1nh \u0111\u1ec1u c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m \u0111\u1ed9 s\u1eafc n\u00e9t c\u1ee7a h\u00ecnh \u1ea3nh.<\/p>\n

      MTF v\u00e0 SFR \u0111\u1ecbnh l\u01b0\u1ee3ng t\u00e1c \u0111\u1ed9ng t\u1ed5ng h\u1ee3p c\u1ee7a c\u00e1c y\u1ebfu t\u1ed1 n\u00e0y b\u1eb1ng c\u00e1ch xem qu\u00e1 tr\u00ecnh ch\u1ee5p \u1ea3nh nh\u01b0 m\u1ed9t H\u1ec7 th\u1ed1ng x\u1eed l\u00fd t\u00edn hi\u1ec7u<\/strong>:<\/p>\n

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      • \n

        \u0110\u1ea7u v\u00e0o: Th\u00f4ng tin c\u1ea3nh g\u1ed1c<\/p>\n<\/li>\n

      • \n

        K\u1ebft qu\u1ea3 \u0111\u1ea7u ra: h\u00ecnh \u1ea3nh cu\u1ed1i c\u00f9ng<\/p>\n<\/li>\n<\/ul>\n

        H\u1ec7 th\u1ed1ng \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n (\u0111\u1ed9 l\u1edbn) c\u1ee7a c\u00e1c th\u00e0nh ph\u1ea7n t\u1ea7n s\u1ed1 kh\u00e1c nhau.
        The \u0110\u01b0\u1eddng cong MTF\/SFR cho th\u1ea5y tr\u1ef1c quan m\u1ee9c \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n \u1edf m\u1ed7i t\u1ea7n s\u1ed1 kh\u00f4ng gian.<\/strong>.<\/p>\n

        M\u1ed9t nguy\u00ean t\u1eafc quan tr\u1ecdng l\u00e0 r\u1eb1ng \u0110\u01b0\u1eddng cong MTF t\u1ed5ng th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng l\u00e0 t\u00edch c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng cong MTF c\u1ee7a c\u00e1c th\u00e0nh ph\u1ea7n ri\u00eang l\u1ebb.<\/strong> (\u1ed1ng k\u00ednh, c\u1ea3m bi\u1ebfn, b\u1ed9 l\u1ecdc quang h\u1ecdc th\u1ea5p, v.v.).
        Do \u0111\u00f3, vi\u1ec7c ph\u00e2n t\u00edch \u0111\u01b0\u1eddng cong MTF cho ph\u00e9p c\u00e1c k\u1ef9 s\u01b0 X\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c c\u00e1c \u0111i\u1ec3m ngh\u1ebdn<\/strong> v\u00e0 t\u1ed1i \u01b0u h\u00f3a thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c cao.<\/p>\n

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        03 Ki\u1ec3m tra trong th\u1ef1c t\u1ebf: C\u00e1ch \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 s\u1eafc n\u00e9t nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n

        C\u00e1c ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra ti\u00eau chu\u1ea9n h\u00f3a l\u00e0 n\u1ec1n t\u1ea3ng cho vi\u1ec7c so s\u00e1nh k\u1ebft qu\u1ea3.
        Ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn cho th\u1eed nghi\u1ec7m SFR l\u00e0 Ti\u00eau chu\u1ea9n ISO 12233<\/strong>, l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c ph\u00e1t h\u00e0nh v\u00e0o n\u0103m 2000 v\u00e0 li\u00ean t\u1ee5c \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt k\u1ec3 t\u1eeb \u0111\u00f3.<\/p>\n

        Nguy\u00ean t\u1eafc ki\u1ec3m th\u1eed c\u1ed1t l\u00f5i<\/h3>\n

        Ti\u00eau chu\u1ea9n s\u1eed d\u1ee5ng m\u1ed9t vi\u1ec1n nghi\u00eang<\/strong> (th\u01b0\u1eddng nghi\u00eang kho\u1ea3ng ~5\u00b0) l\u00e0m m\u1ee5c ti\u00eau th\u1eed nghi\u1ec7m.
        S\u1ef1 nghi\u00eang nh\u1eb9 n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng\u2014n\u00f3 t\u1ea1o ra nhi\u1ec1u m\u1eabu pha, cho ph\u00e9p L\u1ea5y m\u1eabu qu\u00e1 m\u1ee9c<\/strong>.<\/p>\n

        Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y b\u00f9 \u0111\u1eafp cho c\u00e1c sai s\u1ed1 do m\u1ea3ng pixel r\u1eddi r\u1ea1c c\u1ee7a c\u1ea3m bi\u1ebfn h\u00ecnh \u1ea3nh g\u00e2y ra, cho ph\u00e9p t\u00ednh to\u00e1n ch\u00ednh x\u00e1c c\u1ee7a H\u00e0m lan truy\u1ec1n bi\u00ean (ESF)<\/strong>.<\/p>\n

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        Quy tr\u00ecnh ki\u1ec3m tra ti\u00eau chu\u1ea9n<\/h3>\n
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        1. \n

          C\u00e0i \u0111\u1eb7t m\u00f4i tr\u01b0\u1eddng<\/strong>
          Th\u1eed nghi\u1ec7m \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong ph\u00f2ng t\u1ed1i s\u1eed d\u1ee5ng \u00e1nh s\u00e1ng ti\u00eau chu\u1ea9n (v\u00ed d\u1ee5: nhi\u1ec7t \u0111\u1ed9 m\u00e0u 6500K, 800 lux), \u0111\u1ea3m b\u1ea3o \u00e1nh s\u00e1ng \u0111\u1ed3ng \u0111\u1ec1u tr\u00ean b\u1ea3ng th\u1eed nghi\u1ec7m.<\/p>\n<\/li>\n

        2. \n

          Ch\u1ee5p \u1ea3nh<\/strong>
          Thi\u1ebft b\u1ecb \u0111ang \u0111\u01b0\u1ee3c ki\u1ec3m tra (DUT) \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t ch\u1eafc ch\u1eafn, \u0111i\u1ec1u ch\u1ec9nh ti\u00eau c\u1ef1 ch\u00ednh x\u00e1c v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ch\u1ee5p \u1ea3nh b\u1ea3ng th\u1eed nghi\u1ec7m.<\/p>\n<\/li>\n

        3. \n

          Ph\u00e2n t\u00edch ph\u1ea7n m\u1ec1m<\/strong>
          Ph\u1ea7n m\u1ec1m chuy\u00ean nghi\u1ec7p nh\u01b0 Imatest Master<\/strong> ho\u1eb7c RIQA<\/strong> T\u1ef1 \u0111\u1ed9ng ph\u00e1t hi\u1ec7n v\u00f9ng c\u1ea1nh nghi\u00eang v\u00e0 th\u1ef1c hi\u1ec7n m\u1ed9t chu\u1ed7i c\u00e1c ph\u00e9p t\u00ednh:<\/p>\n

            \n
          • \n

            \u00c1p d\u1ee5ng thu\u1eadt to\u00e1n l\u1ea5y m\u1eabu si\u00eau m\u1eabu H\u00e0m lan truy\u1ec1n bi\u00ean (ESF)<\/strong><\/p>\n<\/li>\n

          • \n

            T\u00ednh \u0111\u1ea1o h\u00e0m b\u1eadc nh\u1ea5t c\u1ee7a ESF \u0111\u1ec3 thu \u0111\u01b0\u1ee3c Ch\u1ee9c n\u0103ng ph\u00e2n t\u00e1n \u0111\u01b0\u1eddng (LSF)<\/strong><\/p>\n<\/li>\n

          • \n

            \u00c1p d\u1ee5ng bi\u1ebfn \u0111\u1ed5i Fourier cho h\u00e0m \u0111\u00e1p \u1ee9ng xung (LSF) v\u00e0 l\u1ea5y \u0111\u1ed9 l\u1edbn, k\u1ebft qu\u1ea3 l\u00e0 h\u00e0m cu\u1ed1i c\u00f9ng. \u0110\u01b0\u1eddng cong SFR (MTF)<\/strong><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

            \n

            B\u1ea3ng 1: Gi\u1ea3i th\u00edch c\u00e1c ch\u1ec9 s\u1ed1 SFR ch\u00ednh<\/h3>\n
            \n
            \n\n\n\n\n\n\n\n
            \u0110\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng<\/th>\n\u0110\u1ecbnh ngh\u0129a & \u00dd ngh\u0129a v\u1eadt l\u00fd<\/th>\n\u1ee8ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/th>\n<\/tr>\n<\/thead>\n
            MTF50<\/strong><\/td>\nT\u1ea7n s\u1ed1 kh\u00f4ng gian t\u1ea1i \u0111\u00f3 h\u00e0m truy\u1ec1n qua (MTF) gi\u1ea3m xu\u1ed1ng 50%.<\/td>\nC\u00f3 m\u1ed1i t\u01b0\u01a1ng quan cao v\u1edbi \u0111\u1ed9 s\u1eafc n\u00e9t m\u00e0 con ng\u01b0\u1eddi c\u1ea3m nh\u1eadn; ch\u1ec9 s\u1ed1 ch\u00ednh \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 s\u1eafc n\u00e9t t\u1ed5ng th\u1ec3 c\u1ee7a h\u00ecnh \u1ea3nh.<\/td>\n<\/tr>\n
            MTF50P<\/strong><\/td>\nT\u1ea7n s\u1ed1 m\u00e0 MTF gi\u1ea3m xu\u1ed1ng 50% so v\u1edbi gi\u00e1 tr\u1ecb \u0111\u1ec9nh c\u1ee7a n\u00f3.<\/td>\nLo\u1ea1i b\u1ecf hi\u1ec7n t\u01b0\u1ee3ng m\u1ea5t \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n \u1edf t\u1ea7n s\u1ed1 th\u1ea5p (v\u00ed d\u1ee5: hi\u1ec7n t\u01b0\u1ee3ng t\u1ed1i vi\u1ec1n) \u0111\u1ec3 t\u00e1i hi\u1ec7n chi ti\u1ebft \u1edf t\u1ea7n s\u1ed1 trung b\u00ecnh \u0111\u1ebfn cao m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c h\u01a1n.<\/td>\n<\/tr>\n
            MTF30 \/ MTF10<\/strong><\/td>\nT\u1ea7n s\u1ed1 m\u00e0 MTF gi\u1ea3m xu\u1ed1ng 30% ho\u1eb7c 10%<\/td>\n\u0110\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng ph\u00e2n gi\u1ea3i chi ti\u1ebft \u1edf \u0111i\u1ec1u ki\u1ec7n t\u01b0\u01a1ng ph\u1ea3n c\u1ef1c th\u1ea5p; \u0111i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng trong c\u00e1c c\u1ea3nh c\u00f3 t\u01b0\u01a1ng ph\u1ea3n cao nh\u01b0 nh\u1eadn d\u1ea1ng v\u0103n b\u1ea3n.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
            \n

            04 Thi\u1ebft l\u1eadp th\u1ef1c t\u1ebf: X\u00e2y d\u1ef1ng h\u1ec7 th\u1ed1ng ki\u1ec3m th\u1eed c\u1ee7a b\u1ea1n<\/h2>\n

            T\u00f9y thu\u1ed9c v\u00e0o m\u1ee5c ti\u00eau ki\u1ec3m th\u1eed, y\u00eau c\u1ea7u \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 ng\u00e2n s\u00e1ch, c\u1ea5u h\u00ecnh h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i th\u00e0nh nhi\u1ec1u c\u1ea5p \u0111\u1ed9.<\/p>\n

            C\u1ea5u h\u00ecnh c\u01a1 b\u1ea3n cho Nghi\u00ean c\u1ee9u v\u00e0 Ph\u00e1t tri\u1ec3n (R&D) v\u00e0 X\u00e1c minh<\/h3>\n
              \n
            • \n

              B\u1ea3ng th\u1eed nghi\u1ec7m SFR tu\u00e2n th\u1ee7 ti\u00eau chu\u1ea9n ISO<\/strong> (vi\u1ec1n nghi\u00eang, SFRplus, v.v.)<\/p>\n<\/li>\n

            • \n

              Ngu\u1ed3n s\u00e1ng ti\u00eau chu\u1ea9n<\/strong> v\u1edbi nhi\u1ec7t \u0111\u1ed9 m\u00e0u v\u00e0 \u0111\u1ed9 s\u00e1ng c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh<\/p>\n<\/li>\n

            • \n

              Ph\u1ea7n m\u1ec1m ph\u00e2n t\u00edch ch\u1ea5t l\u01b0\u1ee3ng h\u00ecnh \u1ea3nh<\/strong> ch\u1eb3ng h\u1ea1n nh\u01b0 Imatest Master ho\u1eb7c RIQA<\/p>\n<\/li>\n<\/ul>\n

              \n

              Thi\u1ebft l\u1eadp ph\u00f2ng th\u00ed nghi\u1ec7m quang h\u1ecdc chuy\u00ean nghi\u1ec7p<\/h3>\n
                \n
              • \n

                Th\u00eam m\u1ed9t Collimator<\/strong>, m\u00f4 ph\u1ecfng \u0111i\u1ec1u ki\u1ec7n l\u1ea5y n\u00e9t v\u00f4 c\u1ef1c trong kh\u00f4ng gian h\u1ea1n ch\u1ebf.<\/p>\n<\/li>\n

              • \n

                C\u1ea7n thi\u1ebft cho vi\u1ec7c \u0111\u00e1nh gi\u00e1 hi\u1ec7u su\u1ea5t c\u1ee7a \u1ed1ng k\u00ednh c\u00f3 ti\u00eau c\u1ef1 d\u00e0i v\u00e0 kh\u1ea3 n\u0103ng l\u1ea5y n\u00e9t v\u00f4 c\u1ef1c.<\/p>\n<\/li>\n<\/ul>\n

                \n

                H\u1ec7 th\u1ed1ng ki\u1ec3m th\u1eed t\u1ef1 \u0111\u1ed9ng ti\u00ean ti\u1ebfn<\/h3>\n

                C\u00e1c ph\u00f2ng th\u00ed nghi\u1ec7m cao c\u1ea5p tri\u1ec3n khai h\u1ec7 th\u1ed1ng t\u1ef1 \u0111\u1ed9ng ho\u00e0n to\u00e0n t\u00edch h\u1ee3p:<\/p>\n

                  \n
                • \n

                  C\u00e1c b\u1ed9 \u0111\u1ecbnh h\u01b0\u1edbng c\u00f3 \u0111\u1ed9ng c\u01a1<\/p>\n<\/li>\n

                • \n

                  C\u00e1c n\u1ec1n t\u1ea3ng chuy\u1ec3n \u0111\u1ed9ng s\u00e1u tr\u1ee5c c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao<\/p>\n<\/li>\n

                • \n

                  Ch\u1ee5p \u1ea3nh t\u1ef1 \u0111\u1ed9ng, c\u0103n ch\u1ec9nh \u0111a g\u00f3c, ph\u00e2n t\u00edch d\u1eef li\u1ec7u v\u00e0 t\u1ea1o b\u00e1o c\u00e1o.<\/p>\n<\/li>\n<\/ul>\n

                  \n

                  B\u1ea3ng 2: C\u1ea5u h\u00ecnh thi\u1ebft b\u1ecb th\u1eed nghi\u1ec7m \u0111i\u1ec3n h\u00ecnh<\/h3>\n
                  \n
                  \n\n\n\n\n\n\n\n\n\n
                  Thi\u1ebft b\u1ecb<\/th>\nCh\u1ee9c n\u0103ng ch\u00ednh & Y\u00eau c\u1ea7u<\/th>\nM\u00f4 h\u00ecnh \u0111\u1ea1i di\u1ec7n \/ Ti\u00eau chu\u1ea9n<\/th>\n<\/tr>\n<\/thead>\n
                  B\u1ea3ng th\u1eed nghi\u1ec7m<\/td>\nC\u00e1c m\u1eabu chu\u1ea9n h\u00f3a c\u00f3 \u0111\u1ed9 ph\u1ea3n x\u1ea1 \u0111\u00e3 bi\u1ebft<\/td>\nISO 12233 c\u1ea1nh nghi\u00eang, SFRplus, Siemens star<\/td>\n<\/tr>\n
                  Ngu\u1ed3n s\u00e1ng ti\u00eau chu\u1ea9n<\/td>\n\u1ed4n \u0111\u1ecbnh, \u0111\u1ed3ng \u0111\u1ec1u, c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh CCT v\u00e0 \u0111\u1ed9 s\u00e1ng.<\/td>\nD\u00f2ng LS-CCXL (2300K\u201310000K)<\/td>\n<\/tr>\n
                  Ph\u1ea7n m\u1ec1m ph\u00e2n t\u00edch<\/td>\nPh\u00e1t hi\u1ec7n ROI, t\u00ednh to\u00e1n ESF\u2192LSF\u2192MTF, b\u00e1o c\u00e1o<\/td>\nImatest Master, RIQA<\/td>\n<\/tr>\n
                  K\u00ednh h\u1ed9i t\u1ee5<\/td>\nM\u00f4 ph\u1ecfng m\u1ee5c ti\u00eau v\u00f4 c\u1ef1c<\/td>\n\u0110\u01b0\u1ee3c t\u00edch h\u1ee3p trong h\u1ec7 th\u1ed1ng RFT<\/td>\n<\/tr>\n
                  H\u1ec7 th\u1ed1ng ki\u1ec3m tra t\u00edch h\u1ee3p<\/td>\nKi\u1ec3m tra quang h\u1ecdc\/c\u01a1 kh\u00ed\/\u0111i\u1ec7n t\u1eed ho\u00e0n to\u00e0n t\u1ef1 \u0111\u1ed9ng<\/td>\nIS-RFT (h\u1ed7 tr\u1ee3 g\u00f3c nh\u00ecn l\u00ean \u0111\u1ebfn 210\u00b0, ki\u1ec3m tra SFR\/\u0111\u1ed9 m\u00e9o\/CA)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
                  \n

                  Ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng tr\u00ean d\u00e2y chuy\u1ec1n s\u1ea3n xu\u1ea5t<\/h3>\n

                  Trong s\u1ea3n xu\u1ea5t h\u00e0ng lo\u1ea1t, \u01b0u ti\u00ean chuy\u1ec3n sang T\u1ed1c \u0111\u1ed9, t\u00ednh nh\u1ea5t qu\u00e1n v\u00e0 t\u1ef1 \u0111\u1ed9ng h\u00f3a<\/strong>. Thi\u1ebft b\u1ecb ki\u1ec3m tra t\u00edch h\u1ee3p trong d\u00e2y chuy\u1ec1n s\u1ea3n xu\u1ea5t c\u00f3 th\u1ec3 ho\u00e0n th\u00e0nh vi\u1ec7c ch\u1ee5p \u1ea3nh, ph\u00e2n t\u00edch v\u00e0 \u0111\u01b0a ra k\u1ebft lu\u1eadn \u0111\u1ed7\/tr\u01b0\u1ee3t trong v\u00f2ng v\u00e0i gi\u00e2y, t\u1ef1 \u0111\u1ed9ng t\u1ea3i k\u1ebft qu\u1ea3 l\u00ean h\u1ec7 th\u1ed1ng MES. Gi\u00e1m s\u00e1t ch\u1ea5t l\u01b0\u1ee3ng th\u1eddi gian th\u1ef1c v\u00e0 kh\u1ea3 n\u0103ng truy xu\u1ea5t ngu\u1ed3n g\u1ed1c<\/strong>.<\/p>\n

                  \n

                  Khi c\u00e1c k\u1ef9 s\u01b0 th\u1ea3o lu\u1eadn v\u1ec1 c\u00e1c chi\u1ebfn l\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a trong qu\u00e1 tr\u00ecnh nghi\u00ean c\u1ee9u c\u00e1c \u0111\u01b0\u1eddng cong MTF ch\u1ed3ng ch\u00e9o, h\u1ecd kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n th\u1ea3o lu\u1eadn v\u1ec1 c\u00e1c t\u1ef7 l\u1ec7 ph\u1ea7n tr\u0103m tr\u1eebu t\u01b0\u1ee3ng.
                  M\u1ed7i s\u1ef1 c\u1ea3i thi\u1ec7n tr\u00ean \u0111\u01b0\u1eddng cong c\u00f3 ngh\u0129a l\u00e0:<\/p>\n

                    \n
                  • \n

                    Xe t\u1ef1 h\u00e0nh ph\u00e1t hi\u1ec7n bi\u1ec3n b\u00e1o giao th\u00f4ng s\u1edbm h\u01a1n.<\/p>\n<\/li>\n

                  • \n

                    C\u00e1c \u1ed1ng n\u1ed9i soi y t\u1ebf cho ph\u00e9p quan s\u00e1t chi ti\u1ebft m\u00f4 nh\u1ecf h\u01a1n.<\/p>\n<\/li>\n

                  • \n

                    \u0110i\u1ec7n tho\u1ea1i th\u00f4ng minh ghi l\u1ea1i nh\u1eefng kho\u1ea3nh kh\u1eafc tho\u00e1ng qua v\u1edbi \u0111\u1ed9 r\u00f5 n\u00e9t cao h\u01a1n.<\/p>\n<\/li>\n<\/ul>\n

                    Sau m\u1ed7i \u0111\u01b0\u1eddng cong MTF l\u00e0 m\u1ed9t th\u1ebf gi\u1edbi r\u00f5 r\u00e0ng h\u01a1n.<\/strong><\/p>","protected":false},"excerpt":{"rendered":"

                    Understanding MTF and SFR Testing in One Article Inside the […]<\/p>","protected":false},"author":2,"featured_media":3651,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[82],"tags":[],"class_list":["post-3694","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tips-tricks"],"acf":[],"_links":{"self":[{"href":"https:\/\/ni-mech.com\/vi\/wp-json\/wp\/v2\/posts\/3694","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ni-mech.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ni-mech.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ni-mech.com\/vi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ni-mech.com\/vi\/wp-json\/wp\/v2\/comments?post=3694"}],"version-history":[{"count":2,"href":"https:\/\/ni-mech.com\/vi\/wp-json\/wp\/v2\/posts\/3694\/revisions"}],"predecessor-version":[{"id":3696,"href":"https:\/\/ni-mech.com\/vi\/wp-json\/wp\/v2\/posts\/3694\/revisions\/3696"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ni-mech.com\/vi\/wp-json\/wp\/v2\/media\/3651"}],"wp:attachment":[{"href":"https:\/\/ni-mech.com\/vi\/wp-json\/wp\/v2\/media?parent=3694"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ni-mech.com\/vi\/wp-json\/wp\/v2\/categories?post=3694"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ni-mech.com\/vi\/wp-json\/wp\/v2\/tags?post=3694"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}