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How can I keep overlapping regions that I see in Imfuse and remove everything else in the image?

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AAS on 6 Jul 2020
Edited: AAS on 13 Jul 2020
I used region props and have converted frames in a video binary images. How do I keep only the overlapping regions and remove everythign else? I would like to store the residual as frames to a video


AAS on 6 Jul 2020
The right most panel is the imfused image of the first and second panel. I would like to keep only the regions that have an overlap and discard everything else as shown in the next image i.e just keep the blue circled regions .

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Accepted Answer

Image Analyst
Image Analyst on 6 Jul 2020
This can be done in one line of code with imreconstruct().
J = imreconstruct(marker,mask) performs morphological reconstruction of the image marker under the image mask, and returns the reconstruction in J. The elements of marker must be less than or equal to the corresponding elements of mask. If the values in marker are greater than corresponding elements inmask, then imreconstruct clips the values to the mask level before starting the procedure.


AAS on 13 Jul 2020
Thank you very much!!! Is there any way to extract the blobs in pre that have an overlap with the post? In other words, I only want the blobs in pre that have an overlap in the next frame. Really sorry if this is redundant
Image Analyst
Image Analyst on 13 Jul 2020
Sure. Just simply use pre in imreconstruct() instead of both:
% Initialization steps. Brute force cleanup of everything currently existing to start with a clean slate.
clc; % Clear the command window.
fprintf('Beginning to run %s.m ...\n', mfilename);
close all; % Close all figures (except those of imtool.)
clear; % Erase all existing variables. Or clearvars if you want.
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 20;
pre = imread('pre.png');
post = imread('post.png');
% Convert to logical
pre = logical(pre(:,:,1));
post = logical(post(:,:,1));
% Show image.
subplot(3, 2, 1);
axis('on', 'image');
title('Pre', 'FontSize', fontSize);
% Show image.
subplot(3, 2, 2);
axis('on', 'image');
title('post', 'FontSize', fontSize);
% Find common/overlap areas
overlapped = pre & post;
% Show image.
subplot(3, 2, 3);
axis('on', 'image');
title('overlapped', 'FontSize', fontSize);
fused = imfuse(pre,post,'falsecolor','Scaling','joint','ColorChannels',[1 2 0]);
subplot(3, 2, 4);
axis('on', 'image');
title('fused', 'FontSize', fontSize);
% Make output image.
output = imreconstruct(overlapped, pre);
% Show image.
subplot(3, 2, 6);
axis('on', 'image');
title('Output', 'FontSize', fontSize);

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