Histograms - 1 : Find, Plot, Analyze !!!

Learn to find and draw Contours
Histograms - 2: Histogram Equalization

Learn to Equalize Histograms to get better contrast for images
Histograms - 3 : 2D Histograms

Learn to find and plot 2D Histograms
Histogram - 4 : Histogram Backprojection

Learn histogram backprojection to segment colored objects