Bao Cao Xu Ly Am Thanh & Hinh Anh

8/13/2019 Bao Cao Xu Ly Am Thanh & Hinh Anh

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Bo co mn Xl m thanh & hnh nh

ti:Vit chng trnh thc hin cn bng lc xm nh mu. Hin th

c tuyn cn bng, lc xm nh gc v nh kt qu. (lc xm hin thtrn 1 gc ca nh). Khng sdng hm imhist c sn trong Matlab.

GVHD:Ts. Nguyn Thanh Bnh

Nhm 1:

1. Dip Ngc Anh2. o Minh t3. Hong Cng Hiu4. Lm Hng Thanh5.Nguyn ThTuyt Trinh6.Nguyn Ngc Minh Th7.Nguyn Trang Kim Yn

I. Xy dng gii thut xl nh:Gm cc bc sau:

Bc 1: c nh, chuyn i nh mu gc thnh nh chc mc xm. Bc 2: Tnh sim nh c mt mc xm, xc nh hm mt phn

bxc sut.

Bc 3: Thc hin cn bng lc xm nh gc, to nh kt qusaukhi cn bng.

Bc 4: Thc hin v lc xm nh gc, lc xm nh cnbng, hin thnh gc v nh cn bng.

II. M phng gii thut trn Matlab:clear all;

% Buoc 1: Chuyen tu anh mau sang anh xam


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A=imread('1.jpg');

Anh_goc=rgb2gray(A);

% To cc bin cn thit

tong_so_pixels=size(Anh_goc,1)*size(Anh_goc,2);

in=[0:1:255]

nk_goc=zeros(256,1);

prk_goc=zeros(256,1);

sk=zeros(256,1);

sk_sao=zeros(256,1);

nk_kq=zeros(256,1);

Anhketqua=uint8(zeros(size(Anh_goc,1),size(Anh_goc,2)));

% Bc 2: Tnh sim nh c mt mc xm, hm mt phn bxc

sut

fori=1:size(Anh_goc,1)

forj=1:size(Anh_goc,2)

value=Anh_goc(i,j);nk_goc(value+1)=nk_goc(value+1)+1;

prk_goc(value+1)=nk_goc(value+1)/tong_so_pixels;

end

end

% Bc 3: Thc hin cn bng lc xm nh gc, to nh kt qusau cn

bngsum=0;

fori=1:size(prk_goc)

sum=sum+prk_goc(i);

sk(i)=sum;

sk_sao(i)=round(sk(i)*256);

end

fori=1:size(Anh_goc,1)


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forj=1:size(Anh_goc,2)

Anhketqua(i,j)=sk_sao(Anh_goc(i,j)+1);

end

end

fori=1:size(Anhketqua,1)

forj=1:size(Anhketqua,2)

value=Anhketqua(i,j);

nk_kq(value+1)=nk_kq(value+1)+1;

end

end

% Bc 4: Thc hin vlc xm nh gc, lc xm nh cn bng,

hin thnh gc v nh cn bng

h1=figure;

set(h1,'color','y');

subplot(2,1,1)

imshow(A);title('Anh goc')

subplot(2,1,2);

stem(nk_goc);

title('Luoc do xam Anh goc')

h2=figure;set(h2,'color','y');

subplot(2,2,1);

imshow(Anhketqua)

title('Anh sau can bang')

subplot(2,2,2) ;

stem(nk_kq);

title('Luoc do xam anh can bang')


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subplot(2,2,3)

plot(in,sk_sao);

title('Dac tuyen can bang');

III. Kt qum phng Matlab: nh mu gc v lc xm gc:

nh sau khi cn bng v lc xm cn bng:


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Nhn xt: So snh lc xm nh gc v nh sau cn bng, ta thy rrng gi trcc mc xm hin thtrong nh c tri u hn so vi

nh gc.

IV. Hng dn sdng GUI:1. Khi ng GUI theo cc bc sau: Khi ng MATLAB. Trong ca sComment Windowns g lnh guide v enter ta c giao

din mn hnh nh sau:


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Chn Tab Open Existing GUI mi GUI to:

GUI ca ti cn bng lc xm ny c thhin nh hnh di:


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2. Hng dn chy GUI: Click vo nt ANH MAU GOCload nh mu gc:

Click ANH XAM CUA ANH GOChin thnh chuyn sang nhchc mu xm v lc xm nh gc:


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Click nt ANH CAN BANGhin thnh sau cn bng lc xmsau cn bng:

Cui cng hin th c tuyn cn bng ta nhn nt DAC TUYENCAN BANG:


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Bao Cao Xu Ly Am Thanh & Hinh Anh