Fig. 3.

Schematic representation of the image classification. a The process is carried out column-wise in the sub-image I, in the region R (vertical gray line) defined by all the pixels between the luminal interface and the point located $300\mathrm{\mu }\text{m}$ below the AP interface (dashed line). b Features are extracted from the region R. The corresponding column is then classified as healthy or diseased. c Resulting classification of the entire image