MATLAB: Show the position of centroids on the image

findregionprops

I have a binary image, BW and a grayscale image, I. I want to select only regions in the binary image with the same value that have an area > 50. for example there are 50 regions with area>50 and BW==1. I wonder how to show the position of the centroids of these regions with their number (1:50) on the image. Any suggestion?

Best Answer

Size filtering and finding and displaying centroids is done in my demo "BlobsDemo" as well as some other useful things.

http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

Related Solutions

MATLAB: How can i separate all the connected regions in a binary image and display them individually.

Use bwlabel() and ismember

[labeledImage, numRegions] = bwlabel(binaryImage);
props = regionprops(labeledImage, 'Area')
% Compute all the areas.
allAreas = [props.Area]
% Display each blob in its own figure.
for k = 1 : numRegions
    thisRegion = ismember(labeledImage, k);
    figure;
    imshow(thisRegion);
    drawnow;
end

MATLAB: Thin the boundary of objects of black & white images

Use imerode.

From Matlab documentation:

IM2 = imerode(IM,SE) erodes the grayscale, binary, or packed binary image IM, returning the eroded image IM2. The argument SE is a structuring element object or array of structuring element objects returned by the strel function.

Example:

Erode a binary image with a disk structuring element.

originalBW = imread('circles.png');  
se = strel('disk',11);        
erodedBW = imerode(originalBW,se);
imshow(originalBW), figure, imshow(erodedBW)

Best Answer

Related Solutions

MATLAB: How can i separate all the connected regions in a binary image and display them individually.

MATLAB: Thin the boundary of objects of black & white images

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