AbstructEstimation of 3-D information from 2-D image coordinates is a fundamental problem both in machine vision and computer vision. Circular features are the most common quadratic-curved features that have been addressed for 3-D location estimation. In this paper, a closed-form analytical solution to the problem of 3-D location estimation of circular features is presented. Two different cases...

A new class of machine codes for the specification of Pythagorean-hodograph (PH) curve tool paths, and associated feedrate functions, is proposed. The PH curves are a special family of free-form curves, compatible with the Bézier/B-spline representations of CAD systems, that are amenable to real-time interpolation at constant or variable feedrate directly from their exact analytic descriptions....

Abstract A limaçon machine is a rotary positive displacement device, in which the housing and rotor are constructed of Pascal curves. Previous works have been published to investigate working these machines two applications: gas expanders compressors. This article presents theoretical investigation into potential modifying profile simplify machine’s manufacturing process reduce production cost....