Plotting histograms in OpenCV

Now that we are familiar with the process of computing histograms using the APIs provided by OpenCV, we turn our attention to the problem of representing the information inside a histogram. In the previous section, we saw that we could easily traverse the Mat object representing our histogram to get a glimpse of the values (frequency counts). Also, in the section on the basics of histogram processing, we saw that a visual representation of a histogram in the form of a bar chart has the advantage of possessing a greater visual appeal. This section essentially attempts to the answer this question: Given a histogram that has been computed by the calcHist() function (or any other method for that matter), how do we represent the same graphically using OpenCV/C++? The key thing to note here is that we are trying to plot the histogram graphically using the same framework of OpenCV and C++ that we have been working with throughout this book. If we relax this restriction...