MATLAB: Filter centroids to find only those of interest in binary image

Question

I have defined the following centroids within a region of interest (blue rectangle) for my binary image. How can I remove or centroids within the red boxed region?

Answer 1

If you know the rows and columns outlining your box you can erase the image inside that box before computing the centroids

mask(row1:row2, col1:col2) = false;
props = regionprops(mask, 'Centroid');

Or you can keep the mask as-is, and just remove the measurements from the output of regionprops():

xy = vertcat(props.Centroid);
xCentroids = xy(:, 1);
yCentroids = xy(:, 2);
badIndexes = xCentroids >= col1 & xCentroids <= col2 & yCentroids >= row1 & yCentroids <= row2;
% Delete the bad ones.
prop(badIndexes) = [];