Projection moiré profilometry with high-dynamic range image

Abstract

As a type of optical measuring apparatus, the charge-coupled diode (CCD) camera provides the capability of increasing the speed of measurement by inspecting an area with only one shot. However, the CCD camera's high-variation range of reflectivity presents an exceptional challenge for the optical measurement established on the surface. We present a method that could enable one to acquire an image with a highdynamic range in one shot without any reduction in spatial resolution. Because of the sufficient signal-to-noise ratio, the method presented could perform the robustness of the phase-retrieving algorithm, and the surface topography could be measured more accurately.

Dynamics range enhancement in digital fringe projection technique

“…to be stationary. Recently an HDR imaging technique in fringe projection was proposed by Zhang et al [6]. In this technique a high dynamic range image has been acquired by adjusting the intensity of some regions of the pattern using a DLP based on the feedback from the reflected pattern of the sample captured by the camera.…”