How to get smoothed plot of a grayscale image?

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Haseeb Hassan on 3 May 2018

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https://uk.mathworks.com/matlabcentral/answers/398843-how-to-get-smoothed-plot-of-a-grayscale-image

Commented: jonas on 3 May 2018

 I am trying to get the smoothed plot of this converted 
 grayscale image plot. Can anyone provide code how we can get a smoothed
 plot.In picture you can see formula for a smooth plot.For example i have plotted 
 values of a grayscale image as follows
 grayImage=imread('capture')
 counts = histcounts(grayImage, 0:256)
 plot(counts)