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Using Multivariate Statistics

This work presents Sketch2Scene, a framework that automatically turns a freehand sketch drawing inferring multiple scene objects to semantically valid, well arranged scenes of 3D models. Unlike the existing works on sketch-based search and composition of 3D models, which typically process individual sketched objects one by one, our technique performs co-retrieval and co-placement of 3D relevant models by jointly processing the sketched objects. This is enabled by summarizing functional and spatial relationships among models in a large collection of 3D scenes as structural groups. Our technique greatly reduces the amount of user intervention needed for sketch-based modeling of 3D scenes and fits well into the traditional production pipeline involving concept design followed by 3D modeling. A pilot study indicates that it is promising to use our technique as an alternative but more efficient tool of standard 3D modeling for 3D scene construction.

Sketch2Scene: sketch-based co-retrieval and co-placement of 3D models

True2Form is a sketch-based modeling system that reconstructs 3D curves from typical design sketches. Our approach to infer 3D form from 2D drawings is a novel mathematical framework of insights derived from perception and design literature. We note that designers favor viewpoints that maximally reveal 3D shape information, and strategically sketch descriptive curves that convey intrinsic shape properties, such as curvature, symmetry, or parallelism. Studies indicate that viewers apply these properties selectively to envision a globally consistent 3D shape. We mimic this selective regularization algorithmically, by progressively detecting and enforcing applicable properties, accounting for their global impact on an evolving 3D curve network. Balancing regularity enforcement against sketch fidelity at each step allows us to correct for inaccuracy inherent in free-hand sketching. We perceptually validate our approach by showing agreement between our algorithm and viewers in selecting applicable regularities. We further evaluate our solution by: reconstructing a range of 3D models from diversely sourced sketches; comparisons to prior art; and visual comparison to both ground-truth and 3D reconstructions by designers.

https://hal.inria.fr/hal-01060850/document

True2Form: 3D curve networks from 2D sketches via selective regularization

Direction fields and vector fields play an increasingly important role in computer graphics and geometry processing. The synthesis of directional fields on surfaces, or other spatial domains, is a fundamental step in numerous applications, such as mesh generation, deformation, texture mapping, and many more. The wide range of applications resulted in definitions for many types of directional fields: from vector and tensor fields, over line and cross fields, to frame and vector-set fields. Depending on the application at hand, researchers have used various notions of objectives and constraints to synthesize such fields. These notions are defined in terms of fairness, feature alignment, symmetry, or field topology, to mention just a few. To facilitate these objectives, various representations, discretizations, and optimization strategies have been developed. These choices come with varying strengths and weaknesses. This report provides a systematic overview of directional field synthesis for graphics applications, the challenges it poses, and the methods developed in recent years to address these challenges.

/pdf/directional-field-synthesis-design-and-processing-17vxlmhnfr.pdf

Directional field synthesis, design, and processing

We present SymbiosisSketch, a hybrid sketching system that combines drawing in air (3D) and on a drawing surface (2D) to create detailed 3D designs of arbitrary scale in an augmented reality (AR) setting. SymbiosisSketch leverages the complementary affordances of 3D (immersive, unconstrained, life-sized) and 2D (precise, constrained, ergonomic) interactions for in situ 3D conceptual design. A defining aspect of our system is the ongoing creation of surfaces from unorganized collections of 3D curves. These surfaces serve a dual purpose: as 3D canvases to map strokes drawn on a 2D tablet, and as shape proxies to occlude the physical environment and hidden curves in a 3D sketch. SymbiosisSketch users draw interchangeably on a 2D tablet or in 3D within an ergonomically comfortable canonical volume, mapped to arbitrary scale in AR. Our evaluation study shows this hybrid technique to be easy to use in situ and effective in transcending the creative potential of either traditional sketching or drawing in air.

SymbiosisSketch: Combining 2D & 3D Sketching for Designing Detailed 3D Objects in Situ

Ein Verfahren und ein System zur Segmentierung von schlauchformigen Strukturen in 3-D-Bildern ist offenbart. A method and a system for segmentation of tubular structures in 3-D images is disclosed. Benutzereingaben, die einen ersten Bereich auf dem Bild innerhalb einer schlauchformigen Struktur und einen zweiten Bereich des Bildes auserhalb der schlauchformigen Struktur kennzeichnen, werden empfangen. User input, featuring a first area on the screen within a tubular structure and a second portion of the image outside of the tubular structure are received. Basierend auf diesen Informationen wird eine geordnete Reihe von Perlen entlang der schlauchformigen Struktur erzeugt. Based on this information, an ordered series of beads along the tubular structure is produced. Perlen sind Kugeln, wobei jede einen Mittelpunktsort und einen Radius aufweist, die basierend auf den Mittelpunktsorten und Radien von vorhergehenden Perlen und auf lokalen Voxel-Intensitaten in dem Bild bestimmt werden. Pearls are balls, each one Mittelpunktsort and has a radius which are determined based on the midpoint locations and radii of the preceding beads and local voxel intensities in the image. Ein kontinuierliches Modell der schlauchformigen Struktur kann durch Interpolieren der Mittelpunktsorte und Radien der geordneten Reihe von Perlen erzeugt werden. A continuous model of the tubular structure may be generated by interpolating the midpoint locations and radii of the ordered series of beads. Die geordnete Reihe von Perlen kann angezeigt und einfach als Reaktion auf eine Benutzereingabe editiert werden, wodurch ein wirksames und flexibles Verfahren zur interaktiven Segmentierung eines Ortes von Interesse in einer schlauchformigen Struktur bereitgestellt wird. The ordered set of pearls can be displayed and edited simply in response to user input, making an effective and flexible method for interactive segmentation of a place of interest in a tubular structure is provided.

Verfahren und System zur Segmentierung von schlauchförmigen Strukturen in 3D-Bildern Method and system for segmentation of tubular structures in 3D images

Brian Whited

Papers

Verfahren und System zur Segmentierung von schlauchförmigen Strukturen in 3D-Bildern Method and system for segmentation of tubular structures in 3D images