How to count each colour pixel of an image?

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muhaimin mahfudz
muhaimin mahfudz 2018-9-30
评论： Image Analyst 2018-10-2
I am trying to quantify the value of of each matter of the brain using matlab. I have segmented the image and result as shown below.
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Akira Agata
Akira Agata 2018-9-30
编辑：Akira Agata 2018-9-30

Is it a result of k-means clustering? If so, you can count each color pixel easily by using the output variable of kmeans function.

muhaimin mahfudz
muhaimin mahfudz 2018-10-1
编辑：muhaimin mahfudz 2018-10-1
yes it is. I see, in conclusion i can just obtain the values from there as it is the value of each segmented color?

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Image Analyst
Image Analyst 2018-9-30

Take the histogram of your segmented/classified image

counts = imhist(classifiedImage);

Each class will have a certain value, like gray matter is 1, background is 0, white material is 2, etc. imhist() simply counts the pixels in each class.

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Image Analyst
Image Analyst 2018-10-1
imhist() will do it. You pass in the classified image, not an RGB image, but the image you got from kmeans. See attached demo.
Image Analyst
Image Analyst 2018-10-2
Do you still not understand? If so, give me the script you used to create that image along with the original image.

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