Three-dimensional profile measurement of small lens using subpixel localization with color grating

In this paper a measurement method of three-dimensional profiles and a reconstruction system using subpixel localization with color gratings projection is described. The system has the effects of identical contrast on gratings for easier identification, switchable picture-in-picture on the display, and adjustable gratings with an adjustment module.The measurement method includes the following: the projection step; image extraction step; image fine-tuning step; subpixel localization processing step; and reconstruction step. A projection apparatus emits a grating towards a small lens under measurement, and forms a grating image on the small lens under measurement. The contrast values of the plurality of grating stripes of the grating image are identical. The grating image and picture-in-picture of a display can be fine-tuned and reconstruct the three-dimensional profiles of the small lens. This method can help improve measurement competence in the reverse engineering industry.