How to display only red parts of an image?

The Image above is an output from using the savitky_golay_filter made by Image Analyst. I am working on taking edges out of an image. I need only the red edges I produced from the image, curve fit and find Trajectory.

This is a college project Im working. Would be great if someone could guide me as deadlines shortcoming.

Attached is the image below of how I want my output to be:

I am stuck at part (c). Outline.

Thanks in advace,

~Harshan Desu

Answer 1

[Mehmed Saad]

You have to get R component which means you have to find out value of R greater than both G and B in RGB data. (May be some threshold like 2 times G or B etc)

suppose the variable rgbtest has the data of pciture you've posted

then

red_comp = rbgtest(:,:,1)>rbgtest(:,:,2) & rbgtest(:,:,1)>rbgtest(:,:,3);
imshow(red_comp)

[Harshan Desu]

Thanks a lot Muhammad Saad. That solves only a part of question. I want the output with all red edges in a format as shown in the below Image. (Red showing all the edges and white as a background.)

[Mehmed Saad]

Logical Indexing

rbgtest(repmat(~red_comp,1,1,3)) = uint8(255);

[Harshan Desu]

I think I almost got it. Thanks a lot Muhammad Saad for your help till now. But I need the edges to be smooth and continuous too. I tired all the sommthening filters but none is working. How shall I do further?

[Mehmed Saad]

I think you should spend some time on it. Also try playing with the conditions which differs red from other colors

red_comp = rbgtest(:,:,1)>rbgtest(:,:,2) & rbgtest(:,:,1)>rbgtest(:,:,3);

[Harshan Desu]

I tried all different conditions and all suggestions I got here sir, nothing is helping me out to get neat and smooth edges. Please help me out.

This is my another question link:

https://www.mathworks.com/matlabcentral/answers/516316-how-to-smooth-edges-of-an-image-with-complex-edges?s_tid=prof_contriblnk