how do I select only the segmented region from a original image in MATLAB

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kashif Mobeen
kashif Mobeen 2021-6-20
评论： Image Analyst 2021-6-20
I need a little help.
I have a MATLAB code in which I've segment out an original image into multiple segments. Now I want to select only a specific segmented area and give it as an input to my function. I have attached my segmented image in which desired part is shown along with the black pixels. How do I select only the desired region, I don't want black pixels region.
Thanks,
for k = 1:max(max(l))
color = img;
color(rgb_label ~= k) = 0;
segmented_images{k} = color;
image = double(segmented_images{k})/255.0;
end

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Matt J
Matt J 2021-6-20
You could do,
S=regionprops(rgb_label,img,'Image')
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Image Analyst
Image Analyst 2021-6-20
You could do
mask = max(rgbImage, [], 3) > 0;
[r, c] = find(mask); % Find rows and columns of non-zero pixels
row1 = min(r);
row2 = max(r);
col1 = min(c);
col2 = max(c);
croppedImage = rgbImage(row1:row2, col1:col2, :);
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Image Analyst
Image Analyst 2021-6-20
Matt's right. Why do you want that anyway? Do you want transparent pixels, like I think PNG images can have so that you can see the background. I never do that since it has no real use in image analysis. If you think you need transparent pixels, explain why? Because I would counter that you don't, even though you think you might. It's not necessary to do any kind of image analysis on the image.

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