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[BV] Added presence code from class nr 11

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Signed-off-by: Jim Martens <github@2martens.de>
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Jim Martens
2017-01-20 13:03:21 +01:00
parent 92fb1816c7
commit fb4a0258e8
1 changed files with 75 additions and 0 deletions
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bv/uebung11_presence.m Normal file
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A = imread('kobi.png');
[L,N] = superpixels(A,500);
figure
BW = boundarymask(L);
imshow(imoverlay(A,BW,'cyan'))
% Set color of each pixel in output image to the mean RGB color of the
% superpixel region.
outputImage = zeros(size(A),'like',A);
idx = label2idx(L);
numRows = size(A,1);
numCols = size(A,2);
for labelVal = 1:N
redIdx = idx{labelVal};
greenIdx = idx{labelVal}+numRows*numCols;
blueIdx = idx{labelVal}+2*numRows*numCols;
outputImage(redIdx) = mean(A(redIdx));
outputImage(greenIdx) = mean(A(greenIdx));
outputImage(blueIdx) = mean(A(blueIdx));
end
figure
imshow(outputImage)
% 2.
he = imread('hestain.png');
imshow(he), title('H&E image');
text(size(he,2),size(he,1)+15,...
'Image courtesy of Alan Partin, Johns Hopkins University', ...
'FontSize',7,'HorizontalAlignment','right');
cform = makecform('srgb2lab');
lab_he = applycform(he,cform);
ab = double(lab_he(:,:,2:3));
nrows = size(ab,1);
ncols = size(ab,2);
ab = reshape(ab,nrows*ncols,2);
nColors = 3;
% repeat the clustering 3 times to avoid local minima
[cluster_idx, cluster_center] = kmeans(ab,nColors,'distance','sqEuclidean', ...
'Replicates',3);
pixel_labels = reshape(cluster_idx,nrows,ncols);
imshow(pixel_labels,[]), title('image labeled by cluster index');
segmented_images = cell(1,3);
rgb_label = repmat(pixel_labels,[1 1 3]);
for k = 1:nColors
color = he;
color(rgb_label ~= k) = 0;
segmented_images{k} = color;
end
imshow(segmented_images{1}), title('objects in cluster 1');
imshow(segmented_images{2}), title('objects in cluster 2');
imshow(segmented_images{3}), title('objects in cluster 3');
mean_cluster_value = mean(cluster_center,2);
[tmp, idx] = sort(mean_cluster_value);
blue_cluster_num = idx(1);
L = lab_he(:,:,1);
blue_idx = find(pixel_labels == blue_cluster_num);
L_blue = L(blue_idx);
is_light_blue = imbinarize(L_blue);
nuclei_labels = repmat(uint8(0),[nrows ncols]);
nuclei_labels(blue_idx(is_light_blue==false)) = 1;
nuclei_labels = repmat(nuclei_labels,[1 1 3]);
blue_nuclei = he;
blue_nuclei(nuclei_labels ~= 1) = 0;
imshow(blue_nuclei), title('blue nuclei');