Optical Design and Engineering

Adaptive illumination based on projector–camera system for multireflective three-dimensional scene

[+] Author Affiliations
Chengang Lyu, Shuang Gao, Jiachen Yang

Tianjin University, School of Electrical and Information Engineering, Tianjin, China

Opt. Eng. 56(2), 025104 (Feb 21, 2017). doi:10.1117/1.OE.56.2.025104
History: Received December 14, 2016; Accepted February 2, 2017
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Abstract.  We introduce a technique for illumination optimization based on a projector–camera system applied to a multireflective three-dimensional (3-D) scene. Simple mapping would fail if the scene is nonplane since they would translate to incoherent mapping between the projector and the camera. The correspondence between the pixels on the projector and camera in multireflective 3-D scene was indirectly established by surface orientation measurement. Once the correspondence was established, the local light was adapted by using the iteration in order to obtain the optimal illumination intensities at different surface orientations. User intervention for judging the desirable image is required in the iteration stage since there is no absolute reference for comparison to which the object must appear. According to the feedback from the camera, the projector is to compensate for surface reflectance for the most part by modulating the projection brightness at each pixel to be inversely proportional to the brightness of the pixel under uniform light. The time required for this adaptive illumination can be shortened to the inspection stage of 40 ms as long as the inspected object does not change in orientation or location. This proposed technique aims to enhance the illumination capabilities and presents a more unified system than existing methods.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Chengang Lyu ; Shuang Gao and Jiachen Yang
"Adaptive illumination based on projector–camera system for multireflective three-dimensional scene", Opt. Eng. 56(2), 025104 (Feb 21, 2017). ; http://dx.doi.org/10.1117/1.OE.56.2.025104


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