Download 3D Computer Vision: Efficient Methods and Applications by Christian Wöhler PDF

By Christian Wöhler

This quintessential textual content introduces the rules of 3-dimensional machine imaginative and prescient and describes fresh contributions to the sphere. totally revised and up to date, this much-anticipated new version stories a number of triangulation-based equipment, together with linear and package deal adjustment dependent techniques to scene reconstruction and digital camera calibration, stereo imaginative and prescient, aspect cloud segmentation, and pose estimation of inflexible, articulated, and versatile gadgets. additionally coated are intensity-based concepts that overview the pixel gray values within the photograph to deduce three-d scene constitution, and aspect unfold functionality dependent ways that make the most the influence of the optical method. The textual content exhibits how equipment which combine those options may be able to bring up reconstruction accuracy and robustness, describing functions in commercial caliber inspection and metrology, human-robot interplay, and distant sensing.

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Extra resources for 3D Computer Vision: Efficient Methods and Applications

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2. Images of the rig should be acquired when the rig is positioned at the near side, in the middle, and at the far side of the space in which three-dimensional scene reconstruction is performed. 3. For all three distances, the calibration rig should also be placed such that it appears close to the corners of the images, respectively. 4. At each selected position, the orientation of the calibration rig should be perpendicular to the optical axis as well as rotated by an angle of about ±30◦ around the horizontal and the vertical axis.

Deciding which of the pixels is the true positive is done during the position estimation at subpixel accuracy. As soon as this position is available, the same data are used to determine the interpolated cross-correlation value. The candidate with the larger cross-correlation value is assumed to be the true positive. Two algorithms for computing the subpixel position are investigated: Weighted mean (WM) and bivariate quadratic interpolation (BVI). The subpixel position of WM is the average of the eight-neighbourhood positions weighted by the corresponding correlation coefficients.

A) Initial graph. (b) Graph without non-bidirectional edges. (c) Graph containing circles only. 4 Geometric Calibration of Single and Multiple Cameras 35 This avoids problems with extremely tilted rigs and false positives next to the rig (not shown here). Another run of the circle filter is performed to eliminate corners which have become unconnected due to differences in length. At this point the rig is assumed to be one component of the graph. The next step is to identify the component which describes the rig.

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