Polygonal approximation algorithm of contour curves
一种轮廓曲线的多边形近似算法

For every point on contour curves, the support area and support radius were first calculated based on actual distance of adjacent pixels, end points were obtained with linear interpolation technique; Next, the distance between point and its eentroid of support area was used as feature strength to determine feature points candidate; Finally, those points with local maximum feature strength were selected as vertices of polygonal. Experiments demonstrate that this algorithm has strong errortolerant capacity for curves digitization and rotation.