Please implement histogram$-$based skin color detector in MatLab:

$1.$ Collect flesh tone training data using build$-$in imcrop or ginput functions

$2.$ Try with different color spaces RGB$,$ Normalized$-$RGB$,$ HSI, HSV

$3.$ Construct $2$D color histogram $($color detector$)$ based on the collected color pixels, R$-$G$,$ NR$-$NG$,$ H$-$S$,$ etc. Note: pay more attention to normalization.

$4.$ Apply the color detector to segment skin color regions in test images.

Assuming both training and test images are $24-$bit bitmap images.