how to extract objects from an image after filling in the objects in the binary image

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I need to delete the objects I have marked below from the binary image but I don't know how to do it can you help

Answers (3)

KALYAN ACHARJYA on 21 Nov 2021
Edited: KALYAN ACHARJYA on 21 Nov 2021
Original BW image
BW_result=bwareafilt(BW,2); % Get the largest 2 max size objects
result=~(BW_result.*BW); % Nand Logical Operation or do other as per requirements

Image Analyst
Image Analyst on 21 Nov 2021
How do you want to specify the objects? Like you're going to manually, interactively click on them? Or based on their size, shape, or location? What exactly indicates those two particular blobs in the image out of the 6 in there?
I mean one way is
[labeledImage, numShapes] = bwlabel(binaryImage);
extractedTwoShapes = ismember(labeledImage, [3, 5]);
but I doubt that's what you want to do.
Image Analyst
Image Analyst on 21 Nov 2021
OK, you can use regionprops() to get both the centroids and bounding boxes. How are you defining the locations of blobs to delete? Like their centroid is in a certain box in your image? Or the edge of your bounding box is in some range?

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yanqi liu
yanqi liu on 22 Nov 2021
sir,may be use mask to filter the block,such as
clc; clear all; close all;
im=imcrop(im,[82 117 519 518]);
bw = im2bw(im);
bt = bw;
bw1 = bwareafilt(bw, 1);
bw2 = bwareafilt(bw, 3);
bw2(bw1) = 0;
bw(logical(bw2)) = 0;
figure; imshow(bt);
figure; imshow(bw);

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