ch01 - nhap mon xu ly anh

7/30/2019 Ch01 - Nhap Mon Xu Ly Anh

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Giithiu chung

11/01/2013Phm Vit Hng Nhp mn x l nh 1


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11/01/2013 Phm Vit Hng Nhp mn x l nh 2


3/20


Trn mu tr(In n)

Trn mu cng(Hinth, nh sng)


4/20


Photoshop


5/20



6/20


Phthin bin


7/2011/01/2013 Phm Vit Hng Nhp mn x l nh 7

Phn vngnh



Nhndin khunmt


9/20

Slcvx l nh

Thu nhnnh

Nng cao chtlngnh

Pht hin bin

Phn vng nh

Nhndngnh

Nn nh



10/20

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.


X l nh

Bo


12/20

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.



13/20

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.



14/20

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.



15/20

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



16/20

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...



17/20

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)



18/20

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.



19/20

Nn l gimthiu khng gian lutr. C 2

cch:

Nn c bo ton thng tin.

Nn khng bo ton thng tin.



20/20

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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