MATLAB: How to Find the min and max coordinates of an object in an image

bounding boxImage Processing Toolboxmin max coordinates

How to find the minX,minY,maxX,maxY of an object in a binary image

Best Answer

[I,J]=find(yourImage);
minIJ=min([I,J],[],1);
maxIJ=max([I,J],[],1);

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MATLAB: Can i get the [x,y]co-ordinates of pixels in the labelled regions

WHY do you need the coordinates of those labels? I never do. You code can do this:

[labeledImage, numberOfBlobs] = bwlabel(opim);
for j=1: numberOfBlobs

To get just one labeled blob at a time, you can use ismember:

thisBlob = ismember(labeledImage, blobNumber);  % in the loop you'd use j instead of blobNumber

MATLAB: How to find the leftmost and rightmost white pixel in a binary image in Matlab

Lots of ways. For example call bwconvhull() and then regionprops to get bounding box.

binaryImage = bwconvhull(binaryImage, 'union');
props = regionprops(binaryImage, 'BoundingBox');
leftColumn = props.BoundingBox(1);
topRow = props.BoundingBox(2);

Or simply use find()

[rows, columns] = find(binaryImage);
leftColumn = min(columns);
topRow = min(rows);

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MATLAB: Can i get the [x,y]co-ordinates of pixels in the labelled regions

MATLAB: How to find the leftmost and rightmost white pixel in a binary image in Matlab

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