MATLAB: How to adjust the height of the histogram created by the IMHIST function in Image Processing Toolbox

Image Processing Toolbox

I would like to modify the maximum height of the histogram generated by the IMHIST function.

Best Answer

The ability to keep constant the maximum height of the histogram generated by IMHIST is not available in the Image Processing Toolbox.

The workaround is to first display the histogram and then set the y-limit of the axis:

I = imread('board.tif');
I = I(:,:,3);
imhist(I);
a = axis
a(4) = 2000;
axis(a)

Related Solutions

MATLAB: Changing width of imhist bins

The second argument is the number of bins, which essentially means the bin width.

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

Best Answer

Related Solutions

MATLAB: Changing width of imhist bins

MATLAB: Histogram

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