Thresholding in Color Image

Dear All, I need to threshold for the range of colors belong to yellow in an color image.How can I do that.I tried with separating the RGB components.But it did not work for my purpose as it would give me unexpected results.

Your kind consideration given with this regard is highly appreciated.

Thanks in advance.

Answer 1

[Image Analyst]

Try the Delta E method in my File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

Or try Brett's method in his File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/38484-segmenttool-an-interactive-gui-for-segmenting-images

Answer 2

[pushk dfd]

Dear Image Analyst, Anyway i couldnt figure it out in the way that is shown there.But thank you very much for your time and efforts.

[Image Analyst]

if you want any help, post your image.

Answer 3

[tudor dima]

If I correctly understood your problem -- you should convert your image to HSV and then obtain your selection by thresholding to the desired hue range ("yellow" in your case).

Also, intensity changes might also alter the perception of a colour as "yellow", so you might want your thresholding to run also on the "V" dimension of your hsv data.

[Image Analyst]

I agree, and both of my links allow him to do exactly that, so I'm really puzzled as to why he said he can't figure it out.