An Improved Method for Tangent Estimation of Digital Curves
Mo Dai · Journal of Engineering Graphics · 2006
The estimation of discrete tangent is an important step in the analysis of images.An improved algorithm of discrete tangent estimation is proposed,which is based on the recognition of discrete straight segments.For each point of a digital curve,the longest discrete segment passing the point is first detected,and this segment is considered as the discrete tangent.To compare the new algorithm and a traditional one,a lot of experiments were conducted on the digital circles and digital ellipses in a wide range of resolution.For each curve,the maximum and the mean of errors are recorded.Experimental results show that the new method has an overall good performance.