How to extract Color Histogram ?

Hi, I doing my project and facing some problem regarding the color histogram. Anyone know how to extract the image and get the output in the feature vector form?

Answer 1

[Image Analyst]

See attached demo.

[Yew Hoe]

thanks a lot and appreciate much.

[Image Analyst]

I have several image segmentation demos/tutorials in my File Exchange http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862, but if this answers your question about how to get RGB histograms, then can you mark it as Accepted? Thanks in advance. If you have any color segmentation questions, post your image and code and tell me what you need to measure in a new question.

[Yew Hoe]

Hi there, did you know how can I get the output in feature vector form, like this [0.1 0.8 0.2 0.2 0.1 0.9]on each image.

[Image Analyst]

What output? I'm sure you know how to make vectors in MATLAB.

[Yew Hoe]

yes. Actually, I'm doing the 3D color histogram feature vector for convenience me to perform the k mean clustering for the similar keyframe.Any idea?

Answer 2

[Bjorn Gustavsson]

These file exchange contributions seems to produce 3-D colour histograms:

3D histogram of RGB image

Drawing Color Histograms and Color Clouds

HTH