205 lines
5.1 KiB
Matlab
205 lines
5.1 KiB
Matlab
clear;
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close all;
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taille_ecran = get(0, 'ScreenSize');
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L = taille_ecran(3);
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H = taille_ecran(4);
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delete("saves/exercice3.gif");
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% Paramètres :
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N = 0; % Nombre de disques d'une configuration
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R = 10; % Rayon des disques
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nb_points_affichage_disque = 30;
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increment_angulaire = 2 * pi / nb_points_affichage_disque;
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theta = 0:increment_angulaire:2 * pi;
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rose = [253 108 158] / 255;
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q_max = 1000;
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nb_affichages = 20;
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pas_entre_affichages = floor(q_max / nb_affichages);
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temps_pause = 0.001;
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alpha = 0.99;
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beta = 1;
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lambda = 100;
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T = 0.1;
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gamma = 5;
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S = 130;
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a1 = 10;
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a2 = 7;
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e1 = 0.8;
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% Lecture et affichage de l'image :
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I = imread('colonie.png');
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I = rgb2gray(I);
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I = double(I);
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I = I(1:400, 100:450);
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[nb_lignes, nb_colonnes] = size(I);
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poog = figure('Name', ['Detection de ' num2str(N) ' flamants roses'], 'Position', [0.25 * L, 0, 0.4 * L, 0.5 * H]);
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pause
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% Tirage aléatoire d'une configuration initiale et calcul des niveaux de gris moyens :
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c = zeros(N, 2);
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a = zeros(N, 1);
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e = zeros(N, 1);
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teta = zeros(N, 1);
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I_moyen = zeros(N, 1);
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for i = 1:N
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c(i, :) = [nb_colonnes * rand nb_lignes * rand];
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a(i) = a1 + a2 * rand();
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e(i) = e1 * rand();
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teta(i) = 2 * pi * rand();
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I_moyen(i) = calcul_I_moyen_elli(I, c(i), a(i), e(i), teta(i));
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end
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liste_q = 0;
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liste_U = 0;
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liste_N = N;
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liste_I_moyen_config = 0;
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% Recherche de la configuration optimale :
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q = 1;
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qq = 1;
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while 1
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c_ancien = c;
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a_ancien = a;
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e_ancien = e;
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teta_ancien = teta;
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% 1 Naissances
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N_til = poissrnd(lambda);
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N = length(c);
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c = [c; zeros(N_til, 2)];
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a = [a; zeros(N_til, 1)];
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e = [e; zeros(N_til, 1)];
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teta = [teta; zeros(N_til, 1)];
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I_moyen = [I_moyen; zeros(N_til, 1)];
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for i = N + 1:N + N_til
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c(i, :) = [nb_colonnes * rand nb_lignes * rand];
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a(i) = a1 + a2 * rand();
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e(i) = e1 * rand();
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teta(i) = 2 * pi * rand();
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I_moyen(i) = calcul_I_moyen_elli(I, c(i, :), a(i), e(i), teta(i));
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end
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% 2 Tri des disques
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N = length(c);
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U = 1 - 2 ./ (1 + exp(-gamma * (I_moyen / S - 1)));
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[U, ordre] = sort(U, 1, "descend");
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I_moyen = I_moyen(ordre);
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c = c(ordre, :);
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a = a(ordre);
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e = e(ordre);
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teta = teta(ordre);
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% 3 Morts
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i = 1;
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calcul_U = 1;
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while i < length(c)
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N = length(c);
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if calcul_U
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diffX = c(:, 1) - c(:, 1)';
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diffY = c(:, 2) - c(:, 2)';
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dist = sqrt(diffX.^2 + diffY.^2);
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delta = sum(dist < sqrt(2) * (a1 + a2 / 2), "all") - N;
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U_tot = sum(U) + beta * delta;
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end
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diffX = c([1:i - 1 i + 1:N], 1) - c([1:i - 1 i + 1:N], 1)';
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diffY = c([1:i - 1 i + 1:N], 2) - c([1:i - 1 i + 1:N], 2)';
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dist = sqrt(diffX.^2 + diffY.^2);
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delta = sum(dist < sqrt(2) * (a1 + a2 / 2), "all") - (N - 1);
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U_c = sum(U([1:i - 1 i + 1:N])) + beta * delta;
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proba = lambda / (lambda + exp((U_c - U_tot) / T));
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if proba > rand()
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c(i, :) = [];
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a(i) = [];
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e(i) = [];
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teta(i) = [];
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I_moyen(i) = [];
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U(i) = [];
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calcul_U = 1;
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else
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i = i + 1;
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calcul_U = 0;
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end
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end
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N = length(c);
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% 4 Test de convergence
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if q > q_max
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break
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end
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T = alpha * T;
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lambda = alpha * lambda;
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% Si le disque proposé est "meilleur", mises à jour :
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hold off;
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subplot(2, 2, 1);
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imagesc(I);
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axis image;
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axis off;
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colormap gray;
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hold on;
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for j = 1:N
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AZE = a(j) * [cos(theta); sqrt(1 - e(j)^2) * sin(theta)];
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AZE = c(j, :)' + [cos(teta(j)) (-sin(teta(j))); sin(teta(j)) cos(teta(j))] * AZE;
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x_affich = AZE(1, :);
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y_affich = AZE(2, :);
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indices = find(x_affich > 0 & x_affich < nb_colonnes & y_affich > 0 & y_affich < nb_lignes);
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subplot(2, 2, 1);
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plot(x_affich(indices), y_affich(indices), 'Color', rose, 'LineWidth', 3);
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end
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pause(temps_pause);
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% Courbe d'évolution du niveau d'énergie :
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diffX = c(:, 1) - c(:, 1)';
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diffY = c(:, 2) - c(:, 2)';
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dist = sqrt(diffX.^2 + diffY.^2);
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delta = sum(dist < sqrt(2) * (a1 + a2 / 2), "all") - N;
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U_tot = sum(U) + beta * delta;
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if rem(q, pas_entre_affichages) == 0 || q == 1
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liste_q = [liste_q q];
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liste_U = [liste_U U_tot];
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liste_N = [liste_N N];
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I_moyen_config = mean(I_moyen);
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liste_I_moyen_config = [liste_I_moyen_config I_moyen_config];
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subplot(2, 2, 2);
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plot(liste_q, liste_I_moyen_config, '.-', 'Color', rose, 'LineWidth', 3);
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axis([0 q_max 0 255]);
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xlabel('Nombre d''iterations');
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ylabel('Niveau de gris moyen');
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subplot(2, 2, 3);
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plot(liste_q, liste_U, '.-', 'Color', rose, 'LineWidth', 3);
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xlabel('Nombre d''iterations');
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ylabel('Energie');
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xlim([0, q_max]);
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subplot(2, 2, 4);
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plot(liste_q, liste_N, '.-', 'Color', rose, 'LineWidth', 3);
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xlim([0, q_max]);
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xlabel('Nombre de''iteration');
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ylabel('Nombre de point');
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export_fig(poog, "saves/exercice3.gif", '-png', '-painters', '-m2', '-append');
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end
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q = q + 1;
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end
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