How to detect various colors in a image?

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phaneendra ch
phaneendra ch 2015-12-11
回答： Image Analyst 2015-12-12
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
jgg 2015-12-11
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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回答（2 个）

Image Analyst
Image Analyst 2015-12-12
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.
Let me know if you have any problems, but only after you've read this.
Image Analyst
Image Analyst 2015-12-12
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.

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