How to remove rows from structure based on value condition of field?

Question

Stan Wissink 2021-11-12

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https://ww2.mathworks.cn/matlabcentral/answers/1584949-how-to-remove-rows-from-structure-based-on-value-condition-of-field

回答： Image Analyst 2021-11-12

Hi all,

In my structure class titled 'rawMeasurements' created by the function 'regionprops', I want to remove all rows with a value <10 from the first field called Area.

I tried this to start filtering out all the row's with a value of 1, but it doesn't seem to work and I'm guessing this isn't the best way to do this:

idx = ismember({rawMeasurements.Area}, {'1'});
rawMeasurements = rawMeasurements(~idx);

Does anyone know a way to fix this approach or come up with a new approach entirely?

If you need any additional info, please let me know.

Thank you!

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Answer 1

Image Analyst 2021-11-12

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If you want a binary image with no blobs less than 10, call bwareaopen() before calling regionprops():

mask = bwareaopen(mask, 10); % Throw away blobs of 9 pixels or smaller.
rawMeasurements = regionprops(mask, 'Area');
allAreas = [rawMeasurements.Area]

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Answer 2

KSSV 2021-11-12

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rawMeasurements.Area(rawMeasurements.Area<10) = []

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Stan Wissink 2021-11-12

Thank you for your answer!

Unfortunately, I get an error saying "Error using '<', too many input arguments."

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Answer 3

Awais Saeed 2021-11-12

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S.A = [1 2 3 4 5 6; 11 12 13 14 15 16; 21 22 23 24 25 26; 31 32 1 34 35 36];
S.B = ceil(50*rand(2,2));
S.C = "Some string";
S.D = 3;
[rows,~] = find(S.A < 10);
rows = unique(rows);
S.A(rows,:) = [];