A Fast Shape-from-Focus-Based Surface Topography Measurement Method

Shape from focus is an accurate, but relatively time-consuming, 3D profilometry technique (compared to e.g., laser triangulation or fringe projection). This the case because a large amount of data that needs be captured and processed obtain measurements. In this paper, we propose two-step shape-from-focus measurement approach can improve speed with 40%. By using faster create coarse unknown target, used limit capture only required frames. method significantly processing speed. The was tested on 40 mm by custom target resulted in overall 46% reduction time. accuracy proposed compared against conventional shape comparing both methods more accurate reference.