How to segment objects based on their orientation?

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Mahmoud 2015-2-26

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https://ww2.mathworks.cn/matlabcentral/answers/180616-how-to-segment-objects-based-on-their-orientation

评论： Image Analyst 2015-2-27

If there are three object in a binary image. Their orientation are -45 20 and 85. If I am interested in the object with orientation > 10. how can I do that

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Answer 1

Image Analyst 2015-2-26

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https://ww2.mathworks.cn/matlabcentral/answers/180616-how-to-segment-objects-based-on-their-orientation#answer_169484

在 MATLAB Online 中打开

Just threshold and use the indexes to extract those blobs. Try this (untested):

measurements = regionprops(labeledImage, 'Orientation');
allOrientations = [measurements.Orientation];
keeperIndexes = allOrientations > 10;  % Logical vector
% Extract only those
measurements = measurements(keeperIndexes);

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Mahmoud 2015-2-26

编辑：Mahmoud 2015-2-26

please, any other suggestion? After I get the angles > than 10, I would like to display them as a new binary image.

Image Analyst 2015-2-27

在 MATLAB Online 中打开

Evidently you didn't execute the regionprops line so "measurements" never got assigned. I thought you've already seen my Image Processing tutorial in my File Exchange. That will be very very worthwhile because it goes over all the basics. If you want more help, attach your image so people can try things.

Perhaps you didn't threshold your image and label it yet. You need to have this in front of the code I gave, along of course with code to read in the image, display it etc.

binaryImage = grayImage > someThresholdValue;
labeledImage = bwlabel(binaryImage);
measurements = regionprops(labeledImage, 'Orientation');
allOrientations = [measurements.Orientation];
keeperIndexes = allOrientations > 10;  % Logical vector
% Extract only those
measurements = measurements(keeperIndexes);