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An effective and early polypectomy of adenomatous and serrated polyps may dramatically reduce the incidence of colorectal cancer. Recently, Narrow-band imaging (NBI) sequences have emerged to enhance the description of these polyp types from the description of their microvascular and surface textural patterns. Despite the major observation capabilities, the in-situ analysis from the colonoscopy procedure remains challenging due to dependence on the expertise of gastroenterologists to localize and characterize polyps. This work introduces a robust frame-level strategy that achieves a full characterization of polyp patterns to differentiate among serrated, adenoma, and hyperplastic samples. The proposed strategy learns a deep convolutional representation that supports classification but also retrieves attention maps to localize main regions associated with the lesion. From this deep representation, it was also …