rm tp du drive
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Pierre-antoine Comby
parent
12fc5b2b5c
commit
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8 changed files with 0 additions and 353 deletions
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% Aymeric Arnould, Tom Colinot
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% TP3
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% Codage INTRA (1/3)
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clear all;
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file = fopen('Foreman.qcif','r');
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% Affichage d'une image de la séquence
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% [compY,compU,compV]=yuv_readimage(file,'qcif');
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%
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% figure(1)
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% colormap(gray)
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% subplot(131); imagesc(compY); title('Y')
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% subplot(132); imagesc(compU'); title('U')
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% subplot(133); imagesc(compV'); title('V')
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% Codage d'une séquence d'image successives
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[compY,compU,compV]=yuv_readimage(file,'qcif');
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Y=zeros(size(compY,1),size(compY,2),5);
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Yc= zeros(size(compY,1),size(compY,2),5);
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PSNR=[];
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bpp=[];
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gamma = 1;
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for i=1:5
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[compY,compU,compV]=yuv_readimage(file,'qcif');
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[I_rec,b,r] = encodeINTRA(compY,gamma);
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Y(:,:,i) = compY;
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Yc(:,:,i) = I_rec;
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PSNR(i)=b;
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bpp(i) = r;
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end
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gamma
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mean(PSNR)
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mean(bpp)*size(compY,1)*size(compY,2)*15
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% Affichage des images de bases et des images codées de la séquence
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% figure(1)
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% colormap(gray)
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% for i=1:5
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% subplot(1,5,i); imagesc(Y(:,:,i));
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% end
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%
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% figure(2)
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% colormap(gray)
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% for i=1:5
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% subplot(1,5,i); imagesc(Yc(:,:,i));
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% end
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@ -1,33 +0,0 @@
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% Aymeric Arnould, Tom Colinot
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% TP3
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% Codage INTRA (2/3)
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% Question 7 - PSNR moyen en fonction du débit moyen
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%clear all;
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PSNRmoy=[];
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bpsmoy=[];
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gamma=1:10;
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for k=1:size(gamma,2)
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g=gamma(k);
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file = fopen('Foreman.qcif','r');
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PSNR=[];
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bpp=[];
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for i=1:5
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[compY,~,~]=yuv_readimage(file,'qcif');
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[~,b,r] = encodeINTRA(compY,g);
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PSNR(i)=b;
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bpp(i) = r;
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end
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PSNRmoy(k)=mean(PSNR);
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bpsmoy(k)=mean(bpp)*size(compY,1)*size(compY,2)*15;
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end
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figure(1)
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subplot(131); plot(gamma,PSNRmoy); xlabel('gamma'); ylabel('PSNR moyen');
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subplot(132); plot(gamma,bpsmoy); xlabel('gamma'); ylabel('Debit moyen (bps)');
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subplot(133); plot(bpsmoy,PSNRmoy); xlabel('Debit moyen (bps)'); ylabel('PSNR moyen');
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@ -1,25 +0,0 @@
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% Aymeric Arnould, Tom Colinot
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% TP3
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% Codage INTRA (3/3)
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% Question 8 - Qualité visuelle (INTRA) pour différentes valeurs du débit
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clear all;
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gamma=[0.1 1 3 5]; %Pas de quantification
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file = fopen('Foreman.qcif','r');
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[compY,~,~]=yuv_readimage(file,'qcif');
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figure(1)
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subplot(2,length(gamma)+1,1); imagesc(compY); title('Image non compressee');
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colormap(gray)
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for k=1:size(gamma,2)
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g=gamma(k);
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[Yc,~,bpp] = encodeINTRA(compY,g);
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d=bpp*size(compY,1)*size(compY,2)*15;
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subplot(2,length(gamma)+1,k+1); imagesc(Yc); title(strcat('gamma=',num2str(g),',','Debit=',num2str(d), 'bps'));
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subplot(2,length(gamma)+1,length(gamma)+k+2); imagesc(compY-Yc);
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end
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@ -1,44 +0,0 @@
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% Aymeric Arnould, Tom Colinot
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% TP3
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% Codage INTER (1/3)
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% Questions 9 à 11
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clear all;
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n=5; %Nombre d'images à coder
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gamma=1; %Pas
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file = fopen('Foreman.qcif','r');
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[compY,~,~]=yuv_readimage(file,'qcif');
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Y=zeros(size(compY,1),size(compY,2),n); %images avant codage
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Yc= zeros(size(compY,1),size(compY,2),n); %images codées
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%Codage de la première image
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[I_rec,PSNR,bpp] = encodeINTRA(compY,gamma);
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Y(:,:,1) = compY;
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Yc(:,:,1) = I_rec;
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%Pour les images suivantes, soustraction de l'image n-1 à l'image n avant
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%codage
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for k=2:n
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[compY,~,~]=yuv_readimage(file,'qcif');
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Yk = compY - Yc(:,:,k-1); % différences par rapport à l'image décodée précédente
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[I_rec,PSNR,bpp] = encodeINTRA(Yk,gamma);
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Y(:,:,k) = Yk;
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Yc(:,:,k) = I_rec + Yc(:,:,k-1); % reconstruction à l'aide de l'image décodée précédente
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end
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% Affichage des images de bases et des images codées de la séquence
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figure(1)
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colormap(gray)
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for i=1:n
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subplot(1,n,i); imagesc(Y(:,:,i));
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end
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figure(2)
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colormap(gray)
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for i=1:n
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subplot(1,n,i); imagesc(Yc(:,:,i));
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end
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@ -1,52 +0,0 @@
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% Aymeric Arnould, Tom Colinot
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% TP3
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% Codage INTER (2/3)
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% Questions 12
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%clear all;
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n=5; %Nombre d'images à coder
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gamma=1:10; %Pas
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PSNRmoy=[];
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bpsmoy=[];
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for i=1:length(gamma)
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g = gamma(i);
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file = fopen('Foreman.qcif','r');
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[compY,~,~]=yuv_readimage(file,'qcif');
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PSNR_seq=[];
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bpp_seq=[];
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%Codage de la première image
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[I_rec,PSNR,bpp] = encodeINTRA(compY,g);
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Y(:,:,1) = compY;
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Yc(:,:,1) = I_rec;
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PSNR_seq(1) = PSNR;
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bpp_seq(1) = bpp;
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%Pour les images suivantes, soustraction de l'image n-1 à l'image n avant
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%codage
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for k=2:n
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[compY,~,~]=yuv_readimage(file,'qcif');
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Yk = compY - Yc(:,:,k-1); % différences par rapport à l'image décodée précédente
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[I_rec,PSNR,bpp] = encodeINTRA(Yk,g);
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Y(:,:,k) = Yk;
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Yc(:,:,k) = I_rec + Yc(:,:,k-1); % reconstruction à l'aide de l'image décodée précédente
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PSNR_seq(k) = PSNR;
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bpp_seq(k) = bpp;
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end
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PSNRmoy(i) = mean(PSNR_seq);
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bpsmoy(i) = mean(bpp_seq)*size(compY,1)*size(compY,2)*15;
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end
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figure(1);
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subplot(131); plot(gamma,PSNRmoy); xlabel('gamma'); ylabel('PSNR moyen');
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subplot(132); plot(gamma,bpsmoy); xlabel('gamma'); ylabel('Debit moyen (bps)');
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subplot(133); plot(bpsmoy,PSNRmoy); xlabel('Debit moyen (bps)'); ylabel('PSNR moyen');
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@ -1,47 +0,0 @@
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% Aymeric Arnould, Tom Colinot
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% TP3
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% Codage INTER (3/3)
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% Question 13 - Qualité visuelle (INTER) pour différentes valeurs du débit
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clear all;
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n=5;
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gamma=[0.1 1 3 5]; %Pas de quantification
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file = fopen('Foreman.qcif','r');
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[compY,~,~]=yuv_readimage(file,'qcif');
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Y=zeros(size(compY,1),size(compY,2),n); %images avant codage
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Yc= zeros(size(compY,1),size(compY,2),n); %images codées
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for i=1:size(gamma,2)
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g=gamma(i);
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file = fopen('Foreman.qcif','r');
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[compY,~,~]=yuv_readimage(file,'qcif');
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%Codage de la première image
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[I_rec,PSNR,bpp] = encodeINTRA(compY,g);
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Y(:,:,1) = compY;
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Yc(:,:,1) = I_rec;
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figure(1)
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colormap(gray)
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for k=2:n
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[compY,~,~]=yuv_readimage(file,'qcif');
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Yk = compY - Yc(:,:,k-1); % différences par rapport à l'image décodée précédente
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[I_rec,PSNR,bpp] = encodeINTRA(Yk,g);
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Y(:,:,k) = Yk;
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Yc(:,:,k) = I_rec + Yc(:,:,k-1); % reconstruction à l'aide de l'image décodée précédente
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end
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d=bpp*size(compY,1)*size(compY,2)*15;
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subplot(1,length(gamma)+1,1); imagesc(compY); title('Image non compressee');
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subplot(1,length(gamma)+1,i+1); imagesc(Yc(:,:,end)); title(strcat('gamma=',num2str(g),',','Debit=',num2str(d), 'bps'));
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end
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@ -1,43 +0,0 @@
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% Aymeric Arnould, Tom Colinot
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% TP3
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% Compensation de mouvement (1/2)
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% Codage d'une séquence
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clear all
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n=5; %Nombre d'images à coder
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gamma=1;
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blksize = 16; %taille des blocs
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SearchRange = 8; %portée des vecteurs mouvements
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file = fopen('Foreman.qcif','r');
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[compY,~,~]=yuv_readimage(file,'qcif');
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Y= zeros(size(compY,1),size(compY,2),n); %images de base
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Yc= zeros(size(compY,1),size(compY,2),n); %images (dé)codées
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Yp= zeros(size(compY,1),size(compY,2),n); %images prédites
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%Codage de la première image
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[I_rec,PSNR,bpp] = encodeINTRA(compY,gamma);
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Y(:,:,1) = compY;
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Yc(:,:,1) = I_rec;
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for k = 2:n
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[compY,~,~]=yuv_readimage(file,'qcif');
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Y(:,:,k) = compY;
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compYr = Yc(:,:,k-1);
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[compPred,~,~,~] = PicturePred(compY,compYr,blksize,SearchRange);
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[I_rec,~,~] = encodeINTRA(compY-compPred,gamma);
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Yc(:,:,k) = compPred + I_rec;
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Yp(:,:,k) = compPred;
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end
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% Affichage des images de bases et des images codées de la séquence
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figure(1)
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colormap(gray)
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for i=1:n
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subplot(3,5,i); imagesc(Y(:,:,i));
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subplot(3,5,i+n); imagesc(Yp(:,:,i));
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subplot(3,5,i+2*n); imagesc(Y(:,:,i)-Yp(:,:,i));
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end
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@ -1,58 +0,0 @@
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% Aymeric Arnould, Tom Colinot
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% TP3
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% Compensation de mouvement (2/2)
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% PSNR moyen et débit moyen
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%clear all
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n=5; %Nombre d'images à coder
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gamma=1:10;
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blksize = 16; %taille des blocs
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SearchRange = 8; %portée des vecteurs mouvements
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PSNRmoy=[];
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bpsmoy=[];
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bpsmoy2=[];
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for i=1:length(gamma)
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g=gamma(i);
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file = fopen('Foreman.qcif','r');
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PSNR_seq=[];
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bpp_seq=[];
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bppMV_seq=[];
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[compY,~,~]=yuv_readimage(file,'qcif');
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Yc= zeros(size(compY,1),size(compY,2),n); %images (dé)codées
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%Codage de la première image
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[I_rec,PSNR,bpp] = encodeINTRA(compY,g);
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Yc(:,:,1) = I_rec;
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PSNR_seq(1) = PSNR;
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bpp_seq(1) = bpp;
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for k = 2:n
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[compY,~,~]=yuv_readimage(file,'qcif');
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compYr = Yc(:,:,k-1);
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[compPred,~,~,bppMV] = PicturePred(compY,compYr,blksize,SearchRange);
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[I_rec,~,bpp] = encodeINTRA(compY-compPred,g);
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Yc(:,:,k) = compPred + I_rec;
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PSNR_seq(k) = PSNR;
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bpp_seq(k) = bpp;
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bppMV_seq(k-1) = bppMV;
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end
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PSNRmoy(i) = mean(PSNR_seq);
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bpsmoy(i) = mean(bpp_seq)*size(compY,1)*size(compY,2)*15; %en ne tenant pas compte de bppMV
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bpsmoy2(i) = (mean(bppMV_seq)+mean(bpp_seq))*size(compY,1)*size(compY,2)*15; %en tenant compte de bppMV
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fclose('all');
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end
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figure(2);
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subplot(131); plot(gamma,PSNRmoy); xlabel('gamma'); ylabel('PSNR moyen');
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subplot(132); plot(gamma,bpsmoy,gamma,bpsmoy2); xlabel('gamma'); ylabel('Debit moyen (bps)'); legend('Sans bppMV','Avec bppMV');
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subplot(133); plot(bpsmoy,PSNRmoy,bpsmoy2,PSNRmoy); xlabel('Debit moyen (bps)'); ylabel('PSNR moyen'); legend('Sans bppMV','Avec bppMV');
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