7. Face blood vessels activity in drunk person

In this section, blood vessels are separated and isolated from the rest of the information on the image of the face by applying morphology on the diffused image. For this purpose, the top-hat transformation is applied [7]. Top-hat transformation is applied to isolate hot or cold features in an image of a specific size. An example is shown in Figure 6. The features to be isolated are of 5 � 5 pixels area. This transformation is described next.
