Detection of vertical lines and circles in 3D space using Hough transform techniques
Pradeep K. Sinha, Q.H. Hong · International Conference on Image Processing · 1992
Curve detection is an important topic in computer vision. Amongst the many algorithms for curve detection, methods based on Hough transform (HT) techniques have been found to be very effective. The paper developes two specific HT techniques to detect straight lines vertical to the X-Y plane and circles parallel to the X-Y plane in the 3D space from a single perspective image. The projection of vertical lines remains straight lines in the image, but circles become ellipses when the image plane is assumed to be at an angle ( >