MATLAB: Get objects from non binarized image

bwareafilt()Image Processing Toolboximage segmentation

I use imbinarize() to prepare an image for bwareafilt() to get objects. Once I get the objects, how can I extract the pixels from the original, non-binary image, that match the objects from bwareafilt() ?

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See my Image Segmentation Tutorial. https://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862&sort=downloads_desc

In short, use regionprops() and ask for 'PixelValues':

props = regionprops(binaryImage, grayImage, 'PixelValues');

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MATLAB: Counting holes in an image

Threshold then call imclearborder() and bwlabel(). Assuming you have dark holes on a bright background:

% Binarize:
binaryImage = grayImage < someValue;
% Remove those touching border
binaryImage = imclearborder(binaryImage);
% Count holes:
[~, numHoles] = bwlabel(binaryImage);

MATLAB: Image Binarization

Perhaps you'd like to learn via my image segmentation tutorial at http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 I go over binarization in several other demos there also. Here's some quick code for you in the mean time:

binaryImage = grayImage > thresholdValue; % can also use <

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MATLAB: Counting holes in an image

MATLAB: Image Binarization

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