International Journal of Computer Applications
Ridge orientation is a very important feature that is used for represent ridge topology. Ridge orientation feature is used in enhancement, classification and segmentation etc. therefore reliable estimation of orientation is essential. Most of the orientation estimation methods are satisfactory for moderate noise levels. Researchers have attempted to improve the orientation estimation and proposed novel methods. This paper presents a review of state of the art techniques for ridge orientation estimation. This paper gives an insight into different approaches to orientation estimation techniques and also highlights their advantages and limitations.