In this step, it is functional by using the detected region of
interest to find their own characteristics in term of histogram
analysis. These characteristic are called “state of the art” of
histogram from the image. Feature extraction also works
similarly in both training and testing process. First of all, an
image intensity data has to be converted into histogram style,
then probability density function can be acquired from this
histogram. The feature values which we will consider, can be
described into details as followings;