Remove Background from image and select the region of interest
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Ittiphat Limsakul
on 5 Jan 2019
Commented: Image Analyst
on 5 Jan 2019
I have a image
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/200215/image.png)
and I want to remove the background and select Yellow and Red and my output should be
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/200216/image.png)
How can I do it ?
thanks
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Accepted Answer
Image Analyst
on 5 Jan 2019
Edited: Image Analyst
on 5 Jan 2019
Try the Color Thresholder app on the Apps tab of the tool ribbon.
After color segmentation, you might also need bwareafilt() or bwareaopen() to get rid of all blobs other than the largest one in the mask (binary image).
mask = bwareafilt(mask, 1); % Extract largest blob only.
2 Comments
Image Analyst
on 5 Jan 2019
Run the app, then click the Export button. Tell it to generate the code as a function.
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