Simple two-stage method for the accurate location of Hough transform peaks

The paper describes a method for the rapid, accurate location of Hough transform peaks. First, it is recognised that votes may be rather sparsely distributed in parameter space, so a reliable means of clustering them is vital. Although this may be achieved by multiresolution techniques, an important consideration is that peaks are generally noisy and may be multimodal, so care must be taken over accurate location of any particular mode. The method described is two-stage and works by finding median position in narrow strips passing through primary approximate peaks.