MATLAB: How can i extract area of segmented regions from marker-control watershed segmentation

extract regionsImage Processing Toolboxwatershed segmentation

I want to extract area of segmented regions
   rgb = imread('outdscene.jpg');
      I = rgb2gray(rgb);
      hy = fspecial('sobel');
      hx = hy';
      Iy = imfilter(double(I), hy, 'replicate');
      Ix = imfilter(double(I), hx, 'replicate');
      gradmag = sqrt(Ix.^2 + Iy.^2);
      se = strel('disk',20);
      Io = imopen(I, se);  
      Ie = imerode(I, se);  
      Iobr = imreconstruct(Ie, I); 
      Ioc = imclose(Io, se);
      Iobrd = imdilate(Iobr, se);
      Iobrcbr = imreconstruct(imcomplement(Iobrd), imcomplement(Iobr));
      Iobrcbr = imcomplement(Iobrcbr);
      fgm = imregionalmax(Iobrcbr);
      I2 = I; 
      I2(fgm) = 255;
%clean the edges of the marker blobs
    se2 = strel(ones(5,5));
    fgm2 = imclose(fgm, se2);
    fgm3 = imerode(fgm2, se2);
    fgm4 = bwareaopen(fgm3,20);  
    I3 = I;
    I3(fgm4) = 255;
    bw = im2bw(Iobrcbr, graythresh(Iobrcbr));
    D = bwdist(bw);
    DL = watershed(D);
    bgm = DL == 0;
%Compute the Watershed Transform of the Segmentation Function
    gradmag2 = imimposemin(gradmag, bgm | fgm4);
    L = watershed(gradmag2);
    I4 = I;
    I4(imdilate(L == 0, ones(3,3)) | bgm | fgm4) = 255;
    Lrgb = label2rgb(L, 'jet', 'w', 'shuffle');
    figure, imshow(Lrgb)
    title('Colored watershed label matrix (Lrgb)');
% Please, i want to know how can i extract regions area from this label matrix

Best Answer

Call regionprops().
measurements = regionprops(L, 'Area', 'Perimeter', 'Centroid'); % Or whatever you want.
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