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BO CO LN 2 MN N I - HC K 20132

Tch bin nh trong matlab

Cc bc tch bin nh trong matlab

B1: c nh sdng hm : imread();

B2: lm xm sdng hm: rgb2gray

B3:tch bin sdng cc phng php tch bin :Sobel, Prewitt, Roberts, LoG,Zero Crossing, Canny.

Cc btch bin nh :

1. Btch bin sobel- C php : a=edge(h,'sobel'); h l nh c lm xm

Vd:

f=imread('C:\Users\Thao BK\Desktop\deckop\matlab\oto3.png');h=rgb2gray(f);

g1=edge(h,'sobel');figure,imshow(g1);

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2. Btch bin Prewittf=imread('C:\Users\Thao BK\Desktop\deckop\matlab\oto3.png');

h=rgb2gray(f);

g2=edge(h,'prewitt');figure,imshow(g2);

Btch ny n gin hn btch sobel nhng c sinh ra mt cht nhiu

3. Btch bin RobertsC php : edge(h,'roberts');

Vd:

f=imread('C:\Users\Thao BK\Desktop\deckop\matlab\oto3.png');

h=rgb2gray(f);g3=edge(h,'roberts');

figure,imshow(g3);

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- Btch Roberts l btch n gin nht v l btch bin xa nht trongxl s

- Btch ny c sdng t hn so vi cc btch khc do chc nng giihn ca n ( n khng i xng v khng c tng qut ha tch bin )

4. Btch bin LoGC php :edge(h,'log');Vd :

f=imread('C:\Users\Thao BK\Desktop\deckop\matlab\oto3.png');

h=rgb2gray(f);

g4=edge(h,'log');figure,imshow(g4);

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Phng php ny gim nhiu v c bin nh r nt

5. Btch bin Zero CrossingC php : edge(h,'zerocross');

Vd:

f=imread('C:\Users\Thao BK\Desktop\deckop\matlab\oto3.png');h=rgb2gray(f);g5=edge(h,'zerocross');

figure,imshow(g5);

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6. Btch bin Canny.C php : edge(h,'canny');

Vd:f=imread('C:\Users\Thao BK\Desktop\deckop\matlab\oto3.png');

h=rgb2gray(f);g6=edge(h,'canny');

figure,imshow(g6);

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L btch bin mnh nht ca hm edge nh c lm trn sdng blcGauss