MATLAB: How to get the 1st and the 3rd boundary objects in the binary image

Image Processing Toolboximage segmentation

i segmented an image and got a binary image bw

when i do the below line, i get only 1 numberOfblobs

[labeledImage, numberOfblobs] = bwlabel(bw, 8);

but when i do

structBoundaries = bwboundaries(bw);

i get 5 boundaries, and i need only the 1st and the 3rd boundary objects in the binary image. How to get it in a new binary image with only the first and the third region?

Best Answer

Isn't it

structBoundaries([1 3])

By the way structBoundaries is a very misleading name, implying the variable is a structure when it is actually a cell array.

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MATLAB: Calculating area of irreguar border shape

Assuming you have a good binary image, you do this

measurements = regionprops(logical(binaryImage), 'Area');
allAreas = [measurements.Area];

DON'T USE IMAGE AS THE NAME OF YOUR VARIABLE. It's a built in function and you will overwrite it if you do that. It's never a good idea to use the names of functions or keywords as variable names. I probably wouldn't do it the same way as you but it depend on what your image looks like. For example, I wouldn't burn the perimeter into the image like you're doing - I'd use bwboundaries() and just display the boundaries in the overlay above the image. I'd maybe change some other things too, but whatever, if it works, then fine.

MATLAB: Cut An Image

clear; clc;
I = imread('tamp9f.png');
Icrop = imcrop(I);
bw = im2bw(Icrop);
imshow(bw);  pause;
Ifill = imfill(bw,'holes');
imshow(Ifill);  pause;
Iarea = bwareaopen(Ifill,10000);
imshow(Iarea); pause;
boundary = bwboundaries(Iarea);
b = boundary{1};
imshow(Ifill); hold on; 
plot(b(:,2),b(:,1),'g','LineWidth',3);

The Result :

Best Answer

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MATLAB: Calculating area of irreguar border shape

MATLAB: Cut An Image

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