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Giithiu chung
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Trn mu tr(In n)
Trn mu cng(Hinth, nh sng)
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Photoshop
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Phthin bin
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Phn vngnh
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Nhndin khunmt
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Slcvx l nh
Thu nhnnh
Nng cao chtlngnh
Pht hin bin
Phn vng nh
Nhndngnh
Nn nh
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Qu trnh x l nh c xem nh l qu trnhthao tc nh u vo nhm cho ra ktqu mong
mun.
Kt qu u ra ca mt qu trnh x l nh c thl mt nh tt hnhocmtktlun.
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X l nh
Bo
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nh v imnh:
im nh c xem nh l du hiu hay cng sng
ti mt v tr no ca itng trong khng gian.
nh c xem nh l mt tp hp cc im nh.
Mc xm, mu:
L s cc gi tr c th c ca cc im nh ca nh.
Mc xm l cng sng v mu l mu caim
nh.
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nh thu nhn thng b bin dng do cc thit bquang hc v in t.
khc phc ngi ta s dng cc php chiu,
cc php chiu thng c xydng trn tpcc im iu khin.
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C 2 loi nhiu c bn trong qu trnh thu nhn
nh
Nhiu h thng: l nhiu c quy lut c th kh bng cc
php bin i.
Nhiungu nhin: vtbn khng r nguyn nhn
khcphcbng cc php lc.
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Nhm khc phc tnh khng ng u ca h thnggy ra.
Gimsmc xm:
Thchinbng cch nhm cc mc xm gn nhau thnh mt b. Trng hp ch c 2 mc xm th chnh l chuyn v nh en
trng. ngdng: In nh mu ra my in en trng.
Tng s mc xm:
Thc hin ni suy ra cc mc xm trung gian bng k thutnisuy.
K thut ny nhm tng cng mn cho nh
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Phn tch v chnlc cc cimcanh. Trch chn ty theomcchnhndng:
c im khng gian: Phn b mc xm, phn b xc sut, bin ,im un
c im bin i:Cc c im loi ny c trch chn bng victhc hinlc vng (zonal filtering). Cc b vng c gi l mt n cim (featuremask) thng l cc khe hp vi hnh dng khc nhau(ch nht, tam gic, cung trn ...)
c im bin v ng bin:c trng cho ng bin ca i
tng v dovy rt hu ch trong vic trch trn cc thuc tnh bt binc dng khi nhndng i tng. Cc c im ny c th c trchchn nh ton t gradient, ton t la bn, ton t Laplace...
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Nhndngtng, m titng, phn loi v
phn nhm l nhngvn quan trong trong th
gic my (computer vision).
C cc cch nhndng khc nhau:
Phn loi c mu (supervised classification)
Phn loi khng c mu (unsupervised classification)
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Ba bccbncanhndng: Thu nhndliu v tinx l.
Biudindliu.
Nhndng v ra quytnh.
Cc cch tipcn:
i snh muda vo ctrngc trch chn
Phn loithng k.
i snh cu trc. Phn loida trn mngn-ron nhn to
C thkthp cc cch vi nhau to ra cc hthng lai.
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Nn l gimthiu khng gian lutr. C 2
cch:
Nn c bo ton thng tin.
Nn khng bo ton thng tin.
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Nn nhthng k:Da vo thng k tnxutxut
hinca gi trimnh.
Nn nh khng gian:Da vo v tr khng gian ca
cc imnh. Nn nhsdng php bini:y l kthut nn
khng bo ton nn hiuqu.
Nn nh Fractal:Sdng tnh cht Fractal thhinslplica cc chi tit. Luphngc v quy
lut sinh ra nh.
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