Any way to retain the largest element in a 3D array - similar to bwareafilt?

Question

PhD Problems 2019-7-31

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/474307-any-way-to-retain-the-largest-element-in-a-3d-array-similar-to-bwareafilt

评论： PhD Problems 2019-8-1

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

Hi,

I have this volume in 3D which is displayed using ``volshow``:

As can be seen there are some outlier voxels that are undesireable. Is there any way that I can only retain the largets element in the volume and ignore the rest? Similar to ``bwareafilt(img, 1)`` ?

I tried to use the new ``bwmorph3(vol, 'majority')`` and it did clean it up a bit, but still leave some voxels behind. (The above volshow is after the bwmorph3 majority operation).

Any way to accomplish this?

I'm currently using Matlab 2018b, but am happy to upgrade if any helpful 3D function was introduced later.

update:

I think regionprops3 is what will work for me, I tried regionprops3(vol, 'Volume') on the above image and got this returned

I think the volume 2038747 relates to the largest object (at index 12).

How do I use this to retain only this volume?

Thanks

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KALYAN ACHARJYA 2019-8-1

Can you share the code/representataion code of the volshow image, so that we can try on it?

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Answer 1

Walter Roberson 2019-8-1

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/474307-any-way-to-retain-the-largest-element-in-a-3d-array-similar-to-bwareafilt#answer_385707

在 MATLAB Online 中打开

CC = bwconncomp(vol);
numPixels = cellfun(@numel,CC.PixelIdxList);
[~,idx] = max(numPixels);
filtered_vol = false(size(vol));
filtered_vol(CC.PixelIDXList{idx}) = true;