Computes the global image threshold using Otsu's method by minimizing the
histogramCounts : is the histogram data of the image, that can be calculated
using `imhist` function.
total: is the total number of pixels that can be counted using the
ll : is the level of the global threshold in [0 1]
consider the grayscale image is Ig
Reza Ahmadzadeh (2020). Global Threshold computation using Otsu's Method (https://www.mathworks.com/matlabcentral/fileexchange/52437-global-threshold-computation-using-otsu-s-method), MATLAB Central File Exchange. Retrieved .