The application of narrow band imaging (NBI) in endoscopy improves the accuracy in diagnosis, including reduction in cost and time. It allows better definition between the epithelial surface and the adjacent vascular net via the application of narrow-bandwidth filters to standard white-light endoscopy. The fact, that only selected bandwidths are emitted results in a lower brightness, which requ...

Homomorphic filtering (HF) is a methodology that separates an image into two components: illumination and reflectance. Through the processing of these components, it possible to significantly improve contrast low-frequency components while preserving edges sharp features image. The parameter values filter produces best enhancement depends on conditions for each However, finding optimal paramete...

One important problem in mathematics and statistics is to formulate a mean from a set of data. Various definitions of mean have been studied to represent in some sense an average of data. The applications of these means involve all the fields of science and technology, with nonlinear filtering being a primary example in the area of image processing [1–3]. The goal of this work is to axiomatical...

Human tracking is an emerging research field in computer vision and video surveillance. Lightning changes and occlusion are the main challenges faced during tracking. This paper focuses on people tracking both in indoor and outdoor scenes. Our method is based on color modeling using tensor voting framework, which can handle these challenges. The lightning conditions are controlled by homomorphi...