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| clear all;
load('ORL4646.mat');
test_data_index = []; train_data_index = []; for i=0:39 test_data_index = [test_data_index 10*i+1:10*i+4]; train_data_index = [train_data_index 10*i+5:10*(i+1)]; end
test_data = ORL4646(:, :, test_data_index); train_data = ORL4646(:, :,train_data_index);
mean_face = mean(train_data, 3); waitfor(show_face(mean_face));
cov_matrix = zeros(46, 46); for i=1:size(train_data, 3) centered_face = train_data(:,:,i) - mean_face; cov_matrix = cov_matrix + centered_face' * centered_face; end
scatter_matrix = cov_matrix / (size(train_data, 3) - 1);
[eigen_vectors, dianogol_matrix] = eig(scatter_matrix);
eigen_values = diag(dianogol_matrix);
[sorted_eigen_values, index] = sort(eigen_values, 'descend');
sorted_eigen_vectors = eigen_vectors(:, index);
single_face = train_data(:, :, 1) - mean_face;
index = 1; X = []; Y = []; for i=10:5:46 project_matrix = sorted_eigen_vectors(:,1:i);
rebuild_faces = project_matrix * (project_matrix' * single_face) + mean_face; subplot(2, 4, index); index = index + 1; fig = show_face(rebuild_faces); title(sprintf("i=%d", i));
if (i == 45) waitfor(fig); end projected_train_data = zeros(i,46,size(train_data, 3)); for j=1:size(train_data, 3) projected_train_data(:,:,j) = project_matrix' * (train_data(:,:,j) - mean_face); end projected_test_data = zeros(i,46,size(test_data, 3)); for j=1:size(test_data, 3) projected_test_data(:,:,j) = project_matrix' * (test_data(:,:,j) - mean_face); end k = 1;
minimun_k_values = zeros(k,1); label_of_minimun_k_values = zeros(k,1);
test_face_number = size(projected_test_data, 3);
correct_predict_number = 0;
for each_test_face_index = 1:test_face_number
each_test_face = projected_test_data(:, :, each_test_face_index);
for each_train_face_index = 1:k minimun_k_values(each_train_face_index,1) = norm(each_test_face - projected_train_data(:, :,each_train_face_index)); label_of_minimun_k_values(each_train_face_index,1) = floor((train_data_index(1,each_train_face_index) - 1) / 10) + 1; end
[max_value, index_of_max_value] = max(minimun_k_values);
for each_train_face_index = k+1:size(projected_train_data, 3)
distance = norm(each_test_face - projected_train_data(:, :,each_train_face_index));
if (distance < max_value) minimun_k_values(index_of_max_value,1) = distance; label_of_minimun_k_values(index_of_max_value,1) = floor((train_data_index(1,each_train_face_index) - 1) / 10) + 1; [max_value, index_of_max_value] = max(minimun_k_values); end end
predict_label = mode(label_of_minimun_k_values); real_label = floor((test_data_index(1,each_test_face_index) - 1) / 10)+1;
if (predict_label == real_label) correct_predict_number = correct_predict_number + 1; else end end
correct_rate = correct_predict_number/test_face_number; X = [X i]; Y = [Y correct_rate]; fprintf("i=%d,总测试样本:%d,正确数:%d,正确率:%1f\n", i,test_face_number,correct_predict_number,correct_rate); end
plot(X,Y); hold on;
function fig = show_face(vector) fig = imshow(mat2gray(reshape(vector, [46, 46]))); end
function fig = show_faces(faces) count = 1; index_of_image_to_show = [1,5,10,15,20,25,30,35,40,100]; for i=index_of_image_to_show subplot(2,5,count); fig = show_face(faces(:, :, i)); title(sprintf("i=%d", i)); count = count + 1; end end
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