This paper proposes a method that can measure high-contrast surfaces in real-time without changing camera exposures. We propose to use 180-degree phase-shifted (or inverted) fringe patterns to complement regular fringe patterns. If not all of the regular patterns are saturated, inverted fringe patterns are used in lieu of original saturated patterns for phase retrieval, and if all of the regular fringe patterns are saturated, both the original and inverted fringe patterns are all used for phase computation to reduce phase error. Experimental results demonstrate that three-dimensional (3D) shape measurement can be achieved in real time by adopting the proposed high dynamic range method.
This video shows the results of the paper’s HDR algorithm (using saturated regular and inverted fringe images to recover 3D) compared to the results obtained directly from saturated regular or saturated inverted fringe images. For more videos associated with this publication, please visit https://www.osapublishing.org/oe/abstract.cfm?uri=oe-24-7-7337#articleSupplMat.