Camera Analog

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  • H THNG CAMERA

    CNG TY C PHN U T PHT TRIN CNG NGH SAO VIT

  • Camera Analog

    Camera Analog: Tc l cc hnh nh video k thut s nhn

    c t cc camera gim st s chuyn v u ghi hnh

    thng qua cp ng trc. Camera analog khng ph thuc

    vo mng Internet hay tc ng truyn internet. N l

    mng c lp nn tnh bo mt cao v khng b truy cp tri

    php nu khng kt ni internet. Cht lng ng truyn

    tn hiu n nh.

  • Camera IP

    Camera IP: L loi camera quan st truyn ti hnh nh

    video d trn mng IP. V vy c gi l Camera IP hay

    Camera kt ni mng. Chng c th c d dng tch hp

    vo mt c s h tng mng internet hin c, tuy nhin phi

    kim tra tc ng trn bng thng hin c v phi phn tch

    tnh ng b trc khi lp t. Ngoi ra cn phi tnh n

    di hn ch 100 mt l gii hn truyn dn mt cp mng c

    th chy c.

  • TVL trong camera quan st l g ?

  • Khi Nim

    TVL l phn gii c tnh trong camera analog

    hoc mn hnh ngang. Ni cch khc, TVL l s dng

    c m b ngang ca mt mn hnh. TVL

    c nh ngha theo tng s lng ng thng

    ng sng v ng thng ng ti. Mt thit b c

    phn gii l 400TVL c ngha l c 200 dng thng

    ng sng v 200 dng thng ng ti.

    S ng ny cng cao m khng nhe vo nhau l

    cng sc nt khi xem hnh.n ni ln phn gii ca

    mn hnh.

    > (TV line) cng cao, hnh nh cng sc nt v r

    rng -> cng p > cng t tin.

  • c im Khng nn nhm ln TVL vi cc ng qut ngang

    trong h thng truyn hnh, v d nh PAL l 625 dng cn NTSC l 525 dng.

    http://camerabaominh.vn/blog/wp-content/uploads/2013/08/0012_page1-562px-TVL.pdf_edited.jpg

  • Cc Tiu Chun Thng thng nht, trn th trng, chng ta thy c

    nhng lai sau: 350 TVL; 380 TVL, 420 TVL, 480 TVL,

    520 TVL, 580 TVL, 600 TVLTrong : Cho nhu cu

    quan st thng thng th t 380~480 TVL l t yu

    cu.

    - Trn 480 TVL, ch phc v cho nhng nhu cu c

    bit v gi thnh cao hn nhiu.

    - 350 & 380 TVL phc v cho nhng nhu cu quan st

    gin n thy l c

  • phn gii Megapixel l g?

    Megapixel l n v o phn gii ca thit b quang ( nh

    l s im trong bc nh ) c bit trong Camera s . Gi tr

    Megapixel c tnh bng nhn rng vi chiu cao im

    nh.

    Mt iu lu l HD chnh l 1 tp con ca Megapixel v bt

    k camera no c phn gii hn 1 triu im nh u

    c nh ngha l camera megapixel. Theo phn gii

    megapixel thp nht trong th trng an ninh hin nay l 1

    megapixel, cung cp hnh nh vi phn gii l 1280 x 800

    pixel (tng ng 1 triu im nh) v phn gii cao

    nht l 10 megapixel (tng ng 3648 x 2752 pixel).

    Ngy nay phn gii ang tip tc tng p ng nhu

    cu ngy cng cao trong nhiu lnh vc khc nhau .

  • H NTSC l g? H PAL l g? So

    snh gia NTSC v PAL

  • H NTSC l g?

    NTSC (National Television System Committee) l

    h truyn hnh c s dng hu ht Bc M v

    Nam M.

    Chun NTSC c tn s qut ngang l 60Hz (tng

    ng 30 khung hnh/s).

    Mi khung hnh c tao ra bi 525 dng qut n

  • H PAL l g?

    Pal (Phase Alternating Line) h truyn hnh c dng

    phn ln Chu u, chu

    Chun PAL c tn s qut ngang l 50Hz (tng

    ng 25 khung hnh/s)

    Mi khung hnh c tao ra bi 625 dng qut.

  • S khc bit gia NTSC v Pal/SECAM

    - Ti mt s quc gia nh M, Nht Bn, Hn Quc v cc nc Chu M s dng h thng in li c tn s 60Hz v vy NTSC c s dng hu ht cc nc Chu M bao gm: M, Canada, Mexico, mt s khu vc trung v Nam M, Nht Bn, i Loan v Hn Quc. - Cn cc nc chu u, chu s dng ngun in c tn s 50Hz, cho nn phn ln s dng ch yu l h Pal. Pal c dng rng ri ti cc nc nh Anh, c, Ty Ban Nha, B o Nha, , Trung Quc, n , hu ht cc nc Chu Phi, Trung ng trong c Vit Nam

  • SECAM c th coi l "ngoi vng php lut" ca cc tiu chun video analog. Ging nh PAL, SECAM s dng 625 dng qut, 50 field v 25 khung hnh / giy, nhng thnh phn mu c thc hin khc so vi h PAL hoc NTSC. Cc quc gia trn h thng SECAM bao gm Php, Nga, ng u, v mt s nc ca khu vc Trung ng.

  • So snh gia NTSC v Pal H PAL c 625 dng qut do s cho hnh nh r nt hn so vi h NTSC l 525 dng qut. Tuy nhin vi kh nng cho ra 30 khung hnh/s NTCS li cho ta mt hnh nh mt m hn h Pal ch c 25 khung hnh/s.

  • V vy khi ta chuyn khung hnh t PAL sang h NTSC s

    c hin tng b git v b thiu khung hnh. Ngc li khi ta

    chuyn t h NTSC sang h PAL th hnh nh s b m i.

    Trong camera cng vy cc camera gim st c phn

    gii c tnh bng TVL th ch xut hnh cng c da

    trn 2 h truyn hnh l PAL v NTSC. Tuy nhin xut hnh

    h PAL hay NTSC l ph thuc vo u ghi hnhquyt nh.

    http://www.vienthonghoanggia.com/dau-ghi-hinh-questek.html

  • Cc Phn Gii

  • Tm Hiu V Cc Chun Ngoi Tri

  • IP l g ? IP l tn vit tt cho Ingress Protection (c ngha l chng li

    cc tc ng, xm nhp t bn ngoi). Vic la chn cc

    thit b ph hp vi mi trng xung quanh quyt nh tui

    th v cht lng h thng ca bn, AGC gii thiu vi cc

    bn thng tin v ch s IP

    Cc chun ny thng c t tn dng IPxx, trong x l

    cc ch s(nh 0 1 2 3 4 5 6 ). Mi ch s tng ng vi

    mt chun nh gi do t chc quc t t v kim nh.

  • Ch s u tin nh gi kh chng

    li cc i tng rn 0 - Khng c s bo v c bit no

    1 - Ngn li cc i tng rn c kch thc ln hn 50mm

    khng xm nhp c vo thit b

    2 - Ngn li cc i tng rn c kch thc ln hn 12mm

    khng xm nhp c vo thit b

    3 - Ngn li cc i tng rn c kch thc ln hn 2,5mm

    khng xm nhp c vo thit b

    4 - Ngn li cc i tng rn c kch thc ln hn 1,0mm

    khng xm nhp c vo thit b

    5 - Bi c bo v khng hon ton nhng vn m bo s

    hot ng ca thit b

    6 - Thit b c m bo chng bi hon ton, m bo hot

    ng tt trong mi trng nhiu bi

  • Ch s th hai nh gi kh nng chng

    li nc

    0 - Khng c s bo v c bit no

    1 - Chng li nc chy vo thit b dng git theo phng thng

    ng

    2 - Chng li nc bn vo thit b dng git ti thit b vi tt c

    cc gc nghing di 15

    3 - Chng li nc phun vo thit b vi gc nghing di 60

    4 - Chng li nc te t mi pha ti thit b

    5 - C kh nng chng li nc c phun t mi hng ti thit b

    6 - Thit b vn c bo v khi b nhng nc hon ton

    7- Bo v thit b khi ngm di nc 1m

    8- Bo v thit b khi ngm di nc trn 1 m

  • Wide Dynamic Ranger (WDR): Tnh

    nng nhn ngc sng

  • IR-cut Filter Removable (ICR): Chuyn

    i ch ngy v m

  • ICR Chuyn i gia ch ngy v m bng c hc, p hn nhiu

    ln so vi Day & Night bng k thut s.

    Vi chc nng ny gip camera khi quan st ban m s c hnh

    nh r nt.

    ICR l thit k mng trp (Shutter bng c hc).

    N nm gia ng knh v cm bin hnh v c iu khin bi m

    t hoc nam chm in.

    Khi chc nng ICR c bt, n s cn tia hng ngoi v ch cho

    php nh sng r rt xuyn qua.

    Khi chc nng ICR c tt, nh sng tia hng ngoi s c php

    i qua v hnh nh s chuyn qua ch trng en. Vi chc nng

    hnh nh r r hn rt nhiu

  • (ISC): Kim sot thng minh s tp

    trung n hng ngoi

  • ISC Khi n hng ngoi m cc camera thng thng lun lun tp

    trung n hng ngoi vo 1 ch lm hnh nh b lo.

    ISC lm cho camera c cht lng hnh nh tt nht bi v n ngn

    cn s tp trung ny v n phn b u.

  • 3D-DNR Digital Noise Redution (DNR,

    SNR): Gim nhiu bng k tht s

    Vi tnh nng ny gip camera gim trit tnh trng nhiu bng k thut s. Hnh nh ca camera quan st s c su v r hn.

  • Sense-up: Kim sot thng minh s tp trung n

    hng ngoi

    Chuyn hnh nh r nt trong iu kin nh sng thp vi mu sc

    t nhin nh s pht trin mi v x l hnh nh KTS.

    C th thy c vt th iu kin nh sng cc thp ti 0.0001

    Lux.

  • Digital Image Stabilization (DIS): T ng

    cn bng hnh nh k thut s

    Vi tnh nng ny camera s t ng cn bng hnh nh.

    y l chc nng chng mo hnh k thut s & gim bt s rung

    hnh.

  • High Light Compensation (HLC, ECLPS):

    T ng b & cn bng nh sng

    S ngn chn ngun sng mnh v d nh n pha.

    ng thi t b v cn bng nh sng cho hnh nh p nht.

  • Digital Zoom (D-Zoom): Chc nng phng

    ln hnh K thut s.

    Thng thng cc camera ch cho hnh nh bnh thng, nu mun

    zoom th phi dng ng knh zoom quang hc.

    Cho hnh nh tt nht vi chc nng zoom k thut s khi ng knh

    zoom quang hc b hn ch.

  • Motion Detection: Khoanh vng, pht hin chuyn

    ng (C th lp trnh 4 hoc 8 vng)

    Camera c th d chuyn ng v pht ra tn hiu m khng cn

    gn thm thit thit b cm ng gn ngoi no c.

    vic pht hin v x l chuyn ng ny c hiu qu phi kt ni

    vi mt thit b bo ng.

  • LUX

    LUX l o t l ca cng nh sng, nh cm nhn ca mt ngi,

    nh sng p vo hoc i qua mt b mt. LUX ca camera o t l ca

    nh sng thp nht, trong camera ny to ra mt hnh nh m con

    ngi cm nhn. Mi thit k camera c th c t l LUX khc nhau do

    s dng cc b lc khc nhau v loi CCD s dng.

  • Privacy Masking: Che vng khng cn quan st (C

    th lp trnh 4 hoc 8 vng)

    Ngi dng c th bo v s ring t trong mt s vng trn mn

    hnh camera bng cch nh du nhng im en.

  • Cch Tnh Dung Lng Cng Cho Camera

    + (Dung lng 1 hnh) x (s khung hnh trong mt giy) x (3600 giy) =

    (KB trong 1 gi).

    + (KB trong 1 gi) / (1,000) = (Mb trong 1 gi).

    + (Mb trong 1 gi) x (gi hot ng trong ngy) = (MB trong ngy).

    + (Mb trong ngy) x (Thi gian yu cu lu tr) = (dung lung lu tr

    ti a).

    + (dung lung lu tr ti a) / (t l thi gian c chuyn ng) = (dung

    lng lu tr cn thit)

  • Khi nim RealTime

    C th ghi c 30 hnh trn 1s

  • Xin cm n

    Website www.saoviet.net.vn

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