The Center of the Circle Fitting Optimization Algorithm Based on the Hough Transform for Crane

The basic principle of photogrammetry is mature and widely used in engineering. For gantry cranes, the base which usually a cylinder, measurement center cylinder cross section difficult, but its coordinates have an important impact on safety evaluation cranes. Aiming at problem measuring circle, optimization method fitting circle based Hough transform proposed. In this algorithm, effect image point distortion accuracy considered, similarity between ideal actual midperpendicular compared space. taken as weight midperpendicular, space are fitted again. This process needs to iterate repeatedly until convergence, equal weighted algorithm compared. Finally, according characteristics theoretical verification experiment engineering carried out. experimental results show that proposed has better than obviously improves high value. both experiments, relative error was less one percent. Especially improved by order magnitude. Therefore, significantly effectively solves difficulty cannot be directly measured construction machinery.