Remove Background from image and select the region of interest

I have a image

and I want to remove the background and select Yellow and Red and my output should be

How can I do it ?

thanks

Answer 1

[Image Analyst]

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.

[Ittiphat Limsakul]

Thanks .I don't want a app . I want a code . Can recommend a code ?

[Image Analyst]

Run the app, then click the Export button. Tell it to generate the code as a function.