Mr. Mario Valerio Giuffrida Profile

Mario Valerio Giuffrida

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Proceedings Article | 17 March 2015 Paper

Exploiting time-multiplexing structured light with picoprojectors

Mario Valerio Giuffrida, Giovanni Farinella, Sebastiano Battiato, Mirko Guarnera

Proceedings Volume 9393, 939304 (2015) https://doi.org/10.1117/12.2083031

KEYWORDS: Cameras, Projection systems, Pico projectors, Binary data, Distortion, Software frameworks, Imaging systems, Calibration, Mirrors, Structured light

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When a picture is shot all the information about the distance between the object and the camera gets lost. Depth estimation from a single image is a notable issue in computer vision. In this work we present a hardware and software framework to accomplish the task of 3D measurement through structured light. This technique allows to estimate the depth of the objects, by projecting specific light patterns on the measuring scene. The potentialities of the structured light are well-known in both scientific and industrial contexts. Our framework uses a picoprojector module provided by STMicroelectronics, driven by the designed software projecting time- multiplexing Gray code light patterns. The Gray code is an alternative method to represent binary numbers, ensuring that the hamming distance between two consecutive numbers is always one. Because of this property, this binary coding gives better results for depth estimation task. Many patterns are projected at different time instants, obtaining a dense coding for each pixel. This information is then used to compute the depth for each point in the image. In order to achieve better results, we integrate the depth estimation with the inverted Gray code patterns as well, to compensate projector-camera synchronization problems as well as noise in the scene. Even though our framework is designed for laser picoprojectors, it can be used with conventional image projectors and we present the results for this case too.

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