New PDF release: Image-Based Modeling of Plants and Trees (Morgan & Claypool

By Sing Bing Kang, Long Quan

ISBN-10: 1608452441

ISBN-13: 9781608452446

ISBN-10: 160845245X

ISBN-13: 9781608452453

Crops and timber are one of the most complicated normal items. a lot paintings has been performed trying to version them, with various levels of good fortune. during this publication, we assessment a few of the methods in special effects, which we categorize as rule-based, image-based, and sketch-based equipment. We describe our methods for modeling crops and bushes utilizing pictures. Image-based techniques have the precise virtue that the ensuing version inherits the reasonable form and complexity of a true plant or tree. We use various concepts for modeling vegetation (with rather huge leaves) and timber (with rather small leaves).With vegetation, we version each one leaf from photos, whereas for bushes, the leaves are just approximated as a result of their small measurement and big quantity. either thoughts commence with an identical preliminary step of constitution from movement on a number of photos of the plant or tree that's to be modeled. For our plant modeling approach, simply because we have to version the person leaves, those leaves have to be segmented out from the photographs. We designed our plant modeling method to be interactive, automating the method of form restoration whereas counting on the person to supply basic tricks on segmentation. Segmentation is played in either picture and 3D areas, permitting the person to simply visualize its influence instantly. utilizing the segmented photo and 3D facts, the geometry of every leaf is then immediately recovered from the a number of perspectives by means of becoming a deformable leaf version. Our approach additionally permits the consumer to simply reconstruct branches in an identical demeanour. To version timber, as a result of huge leaf count number, small snapshot footprint, and common occlusions, we don't version the leaves precisely as we do for crops. as an alternative, we populate the tree with leaf replicas from segmented resource pictures to reconstruct the final tree form. additionally, we use the form styles of obvious branches to foretell these of obscured branches. for this reason, we will layout our tree modeling approach which will reduce consumer intervention. We additionally deal with the exact case of modeling a tree from just a unmarried photograph. right here, the consumer is needed to attract strokes at the snapshot to point the tree crown (so that the leaf sector is nearly identified) and to refine the restoration of branches. As ahead of, we concatenate the form styles from a library to generate the 3D form. to verify the effectiveness of our platforms, we express real looking reconstructions of a number of vegetation and bushes from photos. ultimately, we provide our suggestions on enhancing our platforms and at the final demanding situations linked to plant and tree modeling. desk of Contents: creation / overview of Plant and Tree Modeling recommendations / Image-Based procedure for Modeling crops / Image-Based strategy for Modeling bushes / unmarried picture Tree Modeling / precis and Concluding comments / Acknowledgments

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Additional info for Image-Based Modeling of Plants and Trees (Morgan & Claypool Publishers)

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We start with the branch cluster that contains the lowest 3D point (the “root” point), which we assume to be part of the primary branch. ) The shortest paths from the root point to all other points are computed by a standard shortest path algorithm. The edges of the sub-graph are kept if they are part of the shortest paths and discarded otherwise. This step results in 3D points linked along the surface of branches. Next, to extract the skeleton, the lengths of the shortest paths are divided into segments of a pre-specified length.

To populate the tree with leaves, the user first provides the expected average image footprint of leaves. The system then segments each source image based on color. The 3D position of each leaf segment is determined either by its closest 3D point or by its closest branch segment. The 34 CHAPTER 4. 1: Spectrum of plants and trees based on relative leaf size: on the left end of the spectrum, the size of the leaves relative to the plant is large. This is ideal for using the modeling system described in Chapter 3.

Our solution is to design a data-driven editor that allows the user to easily recover the branch structure. We model each branch as a generalized cylinder, with the skeleton being a 3D spline curve. The cylindrical radius can be spatially varying. It is specified at each endpoint of each branch, and linearly interpolated between the endpoints. While the simple scheme may not follow specific botanical models, it is substantially more flexible and easier to handle—and it can be used to closely model the observed plant.

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Image-Based Modeling of Plants and Trees (Morgan & Claypool Publishers) by Sing Bing Kang, Long Quan

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