Image objects characteristics, area and shape

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Tian Tian 2017-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/353158-image-objects-characteristics-area-and-shape

评论： Image Analyst 2017-8-18

Hi, I am working on images with crowded objects with various circularity and sizes. Is there any way to detect and list all their shapes and sizes (grouping ones with the same area, and grouping ones with the same shape after)? Any answer is appreciated.

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Answer 1

Image Analyst 2017-8-18

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Sure. I do that in my Image Segmentation Tutorial http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862&sort=downloads_desc

For example:

props = regionprops(labeledImage, 'Area');
allAreas = [props.Area];
bigAreaIndexes = find(allAreas > 10000); % Blobs with an area > 10000 pixels.
% Extract only the big area blobs:
bigBlobs = ismember(labeledImage, bigAreaIndexes);

Similar for circularity or any other measurement.

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Tian Tian 2017-8-18

Because when a table is used to list all of them, it listed all pixels (which is the image size). The code I used for threholding is: I0 = imread('A1-1a-mulsoil_0703.tif'); imshow(I0) I = imgaussfilt(I0,2); thresh = multithresh(I,2); seg_I = imquantize(I,thresh); figure imshow(seg_I,[]) title ('threholded')

Could you please have a look? Many thanks.