How to detect various colors in a image?
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I want to detect various colours of a image accurtely. If there is a red colour in image with different intensities the code must able to detect the changes and must generate a separate plot for it.
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jgg
le 11 Déc 2015
The standard imread command ( http://www.mathworks.com/help/images/read-image-data-into-the-workspace.html ) will return you a map of your image with the colour channels seperated out. For instance, in a .jpeg, the red colour channel corresponds to im(:,:,1).
I'm not sure what you mean plot in this context. Can you give an example of what you're trying to do?
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Image Analyst
le 12 Déc 2015
See several color segmentation demos in my File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
In addition, see the attached zip file where I find the green parts of a Sharpie marker pen moving in a video.
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Image Analyst
le 12 Déc 2015
An alternative to my other answer is one that looks at a video and finds the mean intensities of the R, G, and B channels and plots them.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/172347/image.jpeg)
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