Similar color segmentation in an RG image.

Hi! I have an RGB image with four main colors (green, orange, yellow, white-ish (the background):

I'd like to separate the fruits from the image similar to the images that I attached.

My first thought would be to decompose the image to the three color channels (R, G, B) and somehow, depending on the brightness of the images (from each channel) threshold the objects, but it gives me a very bad result... Any ideas?

Thank you so much, for advance!

[Dishant Arora]

Color-Based Segmentation Using the L*a*b* Color Space

[Tibor Oravecz]

Thanks, but I tried it, with no luck. :( Maybe I messed up something, because it clustered the colors, but not the way I wanted. For example, all four yellow fruits (the lemon and the three oranges, without the green thingy) are in the same cluster, which is right (in a way), because they are similar colors, but I'd like to segment the similar objects (like the three orenges, as you can see in the attached pictures - the first one is how I managed to segment, and the second one is how it should) not just the colors.

Answer 1

[Image Analyst]

Maybe try this demo: http://www.mathworks.com/products/demos/image/color_seg_k/ipexhistology.html Or else look at the color segmentation methods in my File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862