Title

Modeling Reaction Front Propagation And Porosity In Pressure-Assisted Combustion Synthesis Of Porous Niti Intermetallics

Keywords

Camera calibration; Computer vision; Given rotations; Pose estimation; PTZ camera calibration

Abstract

In this paper, we address the problem of calibrating an active pan-tilt-zoom (PTZ) camera. In this regard, we make three main contributions: first, for the general camera rotation, we provide a novel solution that yields four independent constraints from only two images, by directly decomposing the infinite homography using a series of Givens rotations. Second, for a camera varying its focal length, we present a solution for the degenerate cases of pure pan and pure tilt that occur very frequently in practical applications of PTZ cameras. Third, we derive a new optimized error function for pure rotation or pan-tilt rotation, which plays a similar role as the epipolar constraint in a freely moving camera, in terms of characterizing the reprojection error of point correspondences. Our solutions and analysis are thoroughly validated and tested on both synthetic and real data, whereby the new geometric error function is shown to outperform existing methods in terms of accuracy and noise resilience. © Springer-Verlag 2011.

Publication Date

3-1-2012

Publication Title

Journal of Materials Engineering and Performance

Volume

21

Issue

2

Number of Pages

298-307

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/s11665-011-9929-9

Socpus ID

84861625368 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84861625368

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