MATLAB: Multiple image histogram on the same figure

barimhist

Hi I would like to know how I can plot multiple histogram on the same figure with different color next to each other using imhist command. I know how to do it using hist for a vector but I am looking for doing exactly same thing but for images. something like uploaded image but using imhist.

Best Answer

Why can't you just use hist() or histc(), and bar() or plot()???

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MATLAB: Histogram

Because your variable "array1" is of type int16, so is variable "LL." The hist() function doesn't seem to be able to manage type int16 input. (That's why you get the error.) You could try

>> hist(double(LL))

to get the histogram.

MATLAB: Histogram

There is a ksdensity function that can produce a kernel-smooth density estimate. The issue is that it produces a density (integrates to 1) and the histogram is not a density (bar heights sum to 1). You could figure out the area of the histogram and re-scale the ksdensity values. Alternatively, here's a way to create the histgram, normal curve, and kernel density separately:

x = [randn(100,1); 4+randn(50,1)];
[hts,ctrs] = hist(x)
bar(ctrs,hts,'hist')
area = sum(hts) * (ctrs(2)-ctrs(1))
xx = linspace(-3,7);
hold on; plot(xx,area*normpdf(xx,mean(x),std(x)),'r-')
f = ksdensity(x,xx);
plot(xx,area*f,'g-')
hold off

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MATLAB: Histogram

MATLAB: Histogram

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