How to eliminate some useless lines in an image?

I would like to know if exist a method that cancels the blue lines directly attached to the yellow shapes; for example obtaining only the pink ones (I only traced in pink some of the lines I need, but obviously this has to be extended to the whole image).

How can I do this? Maybe using some proprierties about pixels within the image? I do not know how to procede....

Answer 1

[Image Analyst]

Get a yellow mask, and a blue mask, and use imdilate to dilate the yellow blobs by one pixel layer. Then use the yellow as a marker image on the blue image with imreconstruct(). Then use that to erase those from the RGB image.

Something like (untested):

yellowMask = (rgbImage(:,:,1) == 255) & (rgbImage(:,:,2) == 255) & (rgbImage(:,:,3) == 0);
blueMask = (rgbImage(:,:,1) == 0) & (rgbImage(:,:,2) == 0) & (rgbImage(:,:,3) == 255);
yellowMask = imdilate(yellowMask, true(3));
% Extract only blobs where yellow was touching the blue.
mask = imreconstruct(yellowMask, blueMask);
% Mask the image using bsxfun() function to multiply the mask by each channel individually.  Works for gray scale as well as RGB Color images.
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask, 'like', rgbImage));

[Image Analyst]

Not sure what your edit was today, but did you ever try the code I developed for you?