Make clearer color segmentation.

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Kwanghun Choi
Kwanghun Choi 2017-10-25
评论： Kwanghun Choi 2017-10-25
Hello!! I am a beginner. And I try color segmentation.
two picture is before and after color segmentation. As you see, too many noise and hole are after segmentation.
I just replicate the method which mathwork suppy.(imquantize, Color-Based Segmentation Using K-Means Clustering)
I don't know where is problem.(is code for quantization and clustering wrong? / is color of map poor?) How can I make clear the result?
Are there other good quantization or clustering method?
I know my question is very ambiguous, not concrete. I just want a little hint for better job.
Please advise any suggestion for my work.
function Y2=extcontq(X)
%for color map
%you must control ncolor value for extract clear contour
ncolor=input('ncolor(generally 4) : ');
%Quantization of color image
threshRGB=multithresh(X,7);
threshForPlanes=zeros(3,7);
for i=1:3
thresForPlane(i,:)=multithresh(X(:,:,i),7);
end
value = [0 threshRGB(2:end) 255];
quantRGB=imquantize(X, threshRGB, value);
%clustering
cform=makecform('srgb2lab');
lab_A=applycform(X,cform);
ab=double(lab_A(:,:,2:3));
nrows=size(ab,1);
ncols=size(ab,2);
ab=reshape(ab,nrows*ncols,2);
[cluster_idx,cluster_center]=kmeans(ab,ncolor,'distance','sqEuclidean','Replicates',3);
pixel_label=reshape(cluster_idx,nrows,ncols);
%imshow(pixel_label,[])
%Segmentation
segmented_image = cell(1,3);
rgb_label=repmat(pixel_label,[1 1 3]);
for k=1:ncolor
color=X;
color(rgb_label ~=k)=0;
segmented_image{k}=color;
end
c=1;
while c==1
for i=1:ncolor
imshow(segmented_image{i})
q=input('Do you want this data?(Y=1/N=0)');
if i==ncolor
if q==0
c=input('Return? [Y=1/N=0]');
end
end
if q==1
Y1=segmented_image{i};
c=0;
close all;
break
end
close all;
end
end
%binary
Y2=binary_my(Y1);
imshow(Y2);
d=input('Do you want reverse BW?[Y=1/N=0]');
if d==1
Y2=imcomplement(Y2);
end
close all
Y=Y2;
imshow(Y2);
  2 个评论
Walter Roberson
Walter Roberson 2017-10-25
Which information are you trying to extract?
Kwanghun Choi
Kwanghun Choi 2017-10-25
Contour line. I want to extract contour line.

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