This sub-section shows how we process an input image
for the purpose of extracting features. The process includes
two main phases as follow:
Pre-check. In order to avoid prolonged processing time on
complex photographs, images have to pass a pre-check before
being processed as follows:
The most used colour in the image has to cover at least
10% of the image, and
The image’s colour-histogram median value must be
above 100.