Christian Wöhler's 3D computer vision: efficient methods and applications PDF

By Christian Wöhler

ISBN-10: 3642017312

ISBN-13: 9783642017315

This e-book presents an creation to the principles of third-dimensional desktop imaginative and prescient and describes fresh contributions to the sphere. Geometric equipment comprise linear and package adjustment dependent techniques to scene reconstruction and digicam calibration, stereo imaginative and prescient, element cloud segmentation, and pose estimation of inflexible, articulated, and versatile items. Photometric options evaluation the depth distribution within the photograph to deduce third-dimensional scene constitution, whereas real-aperture techniques take advantage of the habit of the purpose unfold functionality. it really is proven how the mixing of a number of equipment raises reconstruction accuracy and robustness. purposes eventualities comprise commercial caliber inspection, metrology, human-robot-interaction, and distant sensing.

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Extra resources for 3D computer vision: efficient methods and applications

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This solution 30 1 Geometric Approaches to Three-dimensional Scene Reconstruction minimises the term Gf subject to the constraint f = 1. This method essentially corresponds to the eight-point algorithm for determination of the fundamental matrix F as introduced by Longuet-Higgins (1981). A problem with this approach is the fact that the fundamental matrix obtained from Eq. e. the eigenvectors belonging to the zero eigenvalues of F T and F, respectively. These do not exist if the rank of F is higher than 2.

E. its first rows need to be normalised with an appropriate factor k. This factor is obtained by setting ′2 ′2 ′2 r11 + r12 + r13 = k2 ′2 ′2 ′2 r21 + r22 + r23 = k2 ′ ′ ′ ′ ′ ′ r11 r21 + r12 r22 + r13 r23 = 0. 39) ′ and r′ of the first two rows of R amount to such that the missing elements r13 23 ′2 ′2 ′2 = k2 − r11 + r12 r13 ′2 ′2 ′2 r23 = k2 − r21 + r22 . 40) It is shown by Horn (2000) that only the more positive of the two solutions for k2 yields positive right hand sides of Eq. 40). The resulting solution for k2 is 24 1 Geometric Approaches to Three-dimensional Scene Reconstruction k2 = 1 2 2 2 2 2 r11 + + r12 + r21 + r22 [(r11 − r22 )2 + (r12 + r21 )2 ] [(r11 + r22 )2 + (r12 − r21 )2 ] .

While the Kruppa equation represents constraints on ω ∗ but does not involve π˜ ∞ , the modulus constraint determines π˜ ∞ but does not explicitly take into account ω ∗ . Once the plane at infinity π˜ ∞ is determined, affine reconstruction has been performed. The step from affine to metric reconstruction corresponds to determining the intrinsic camera parameters given by the matrix A based on π˜ ∞ . Transformation of the IAC or the DIAC yields a linear algorithm for A. At this point the concept of the homography H induced by a plane π˜ turns out to be helpful.

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3D computer vision: efficient methods and applications by Christian Wöhler

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