Flat Zone Analysis and a Sharpening Operation for Gradual Transition Detection on Video Images

The boundary identification represents an interesting and difficult problem in image processing, mainly if two flat zones are separated by a gradual transition. The most common edge detection operators work properly for sharp edges, but can considerably fail for gradual transitions. In this work, we propose a method to eliminate gradual transitions which preserves the number of the image flat zones. As an application example, we show