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Simultaneous intensity projection for projector response computation with application to an active radiometric calibration

100%

Filio-Aguilar P.-D. , López-García L. , Rueda-Paz J. , Ávila-Aoki M.

2022

tom Vol. 52, nr 4

521--533

One of the most important sources of errors in digital fringe projection (DFP) systems is the nonlinearity in the response of the projector when it uses the three-step phase retrieval algorithm. Thus, it is necessary to increase the accuracy without affecting the efficiency. In this sense, the radiometric rectification methods are used. In this paper, an active radiometric rectification method for digital fringe projection is proposed. This proposal consists in two improvements of traditional active techniques: first, parallel intensity projection is used to obtain the projector response which requires only four dot patterns; and second, a method is provided for the calculation of the inverse polynomial that guarantees symmetry with respect to the response of the projector. Experimental results, in a digital fringe projection system, show that the root-mean-square phase error improves 6.3 times using this proposal.

3D stereo rendering to support high quality stereoscopy

75%

Pietruszka M. , Szajerman D.

tom Vol. 10, nr 2

105-117

The paper deals with generation of pairs of 3D scene images to simulate stereoscopic viewing and presents a generation method by means of which a correct spatial image for default settings can be obtained. The default settings employed by the method are intuitive for both the software developer and the end-user, while the number of the settings is reduced to the necessary minimum. Moreover, the method makes use of the solutions to be found in standard graphic libraries. All these make the method easy to implement as well as readily usable for conversion of the already existing applications to support stereoscopy.