M. Chang et al., A FRINGE CENTER DETECTION TECHNIQUE BASED ON A SUB-PIXEL RESOLUTION, AND ITS APPLICATIONS USING SINUSOIDAL GRATINGS, Optics and lasers in engineering, 20(3), 1994, pp. 163-176
A common problem in optical profilometry is the accuracy in locating f
ringe centers. This paper presents an accurate fringe center detection
technique based on sub-pixel resolution using the fringe projection m
ethod. An optimum reconstruction filter is developed which has low sen
sitivity to noise. In fringe center detection, computer simulation res
ults of using one-pixel and sub-pixel resolutions are compared. The de
tection technique is then applied to radius measurement of cylindrical
objects and surface profile measurement of diffuse objects. The exper
imental results thus obtained through the proposed optimum reconstruct
ion filter show significant improvement in measurement accuracy.