how to generate histograms for superpixel?

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Ad 2017-4-22
评论： Ad 2017-4-23
I have an RGB image converted into Lab image. Generated 44 superpixels and calculated MeanIntensities and pixellist and centroids.How to generate histograms for each superpixel?

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Image Analyst
Image Analyst 2017-4-22
You can loop over the properties extracted by regionprops
props = regionprops(labeledImage, superPixelImage, 'PixelValues');
for k = 1 : length(props)
% Get the pixel values of this region alone:
thesePixelValues = props(k).PixelValues;
% Histogram this region's gra levels.
counts = imhist(thesePixelValues);
% Now do something with counts....
end
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Ad
Ad 2017-4-23
for i=1 : length(lprops)
thesePixelValues = lprops(i).PixelValues;
counts = imhist(thesePixelValues);
end
I got counts value as 256*1 double. Every value is zero.
Can you explain this?

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