Connect two objects to a single blob

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Kamu 2018-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/391539-connect-two-objects-to-a-single-blob

评论： Walter Roberson 2018-3-29

Here is an example image of 2 objects. I want to fill the gap between those two to get a single blob. I tried with different morphological closing but could not get a smooth result as drawn in red.

Any help would be much appreciated.

Original Image:

Desired mask:

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Answer 1

Walter Roberson 2018-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/391539-connect-two-objects-to-a-single-blob#answer_312681

If you find() on the image to get the row and column coordinates, then you can use boundary() to get a list of indices into the row and columns that together, taken in order, give an outline that includes all of the points.

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Kamu 2018-3-29

Thanks Walter for your reply. Could you explain it a bit further? I know those functions but did not understand your approach.

Walter Roberson 2018-3-29

在 MATLAB Online 中打开

[y, x] = find(YourImage);
K = boundary(x, y);
boundary_x = x(K);
boundary_y = y(K);
mask = poly2mask( boundary_x, boundary_y, size(YourImage,1), size(YourImage,2) );

mask is now an ROI that is 1 for everywhere inside the combined object. Or you can

plot(boundary_x, boundary_y, 'r', 'linewidth', 4)

if what you care about is just drawing the outline rather than figuring out which points are inside of it.

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