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Histograms contain useful information about your image, smoothing it will degrade the information, making the histogram mostly useless.
If you still want to use it, here you are: just replace each value by the mean of its neighbors. e.g. smooth_hist[i]=(hist[i-2]+hist[i-1]+hist[i]+hist[i+1]+hist[i+2])/5. You can use a gaussian weighting, too.
