How to remove triangles from an image?

I need to segment the red, blue and yellow/orange-ish parts of the image and I've mostly manged to do that, the only problem is that the yellow/orange-ish segmentation contains discontinuities in some parts due to those little triangles. Any suggestions on how can I remove those triangles? ( or other ideas on how to segment it without the discontinuities). Below I've attached both the image I need to segment and the segmented image with the discontinuities I'm reffering to.

Answer 1

[Akira Agata]

How about the following?

% Read the original image
I = imread('image.jpg');

% Extract orange part (using Color Thresholder App.)
BW = createMask(I);

% Remove noise
BW = bwareafilt(BW,[10 Inf]);

% Apply morphological closing operation
BW = imclose(BW,strel('disk',50));

% Fill the area
BW = imfill(BW,'hole');

% Show the result
figure
imshowpair(I,BW)

[Akira Agata]

OK. Then, please change a little bit, like:

% Read the original image
I = imread('image.jpg');

% Extract orange part (using Color Thresholder App.)
BW = createMask(I);

% Remove noise
BW = bwareafilt(BW,[10 Inf]);

% Apply morphological closing operation
BW = imclose(BW,strel('disk',50));

% Trace the orange line
BW = bwmorph(BW,'skel',Inf);

% Show the result
figure
imshow(BW)

Answer 2

[Paul Simon]

Thank you for the answer, but I need to extract the outline of the orange part, not its whole area.

Answer 3

[Paul Simon]

Great, thanks a lot.