scholarly journals Volume illustration: non-photorealistic rendering of volume models

2002 ◽  
Author(s):  
D. Ebert ◽  
P. Rheingans
Keyword(s):  
Photorealistic Rendering ◽  
Volume Illustration ◽  
Volume Models

scholarly journals Adaptive B-spline volume representation of measured BRDF data for photorealistic rendering

2014 ◽  
Vol 2 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Hyungjun Park ◽  
Joo-Haeng Lee
Keyword(s):  
Curve Fitting ◽  
Adaptive Method ◽  
Bidirectional Reflectance ◽  
B Spline ◽  
Spline Curve ◽  
Material Appearance ◽  
Photorealistic Rendering ◽  
Efficient Data ◽  
Bidirectional Reflectance Distribution ◽  
Volume Models

Abstract Measured bidirectional reflectance distribution function (BRDF) data have been used to represent complex interaction between lights and surface materials for photorealistic rendering. However, their massive size makes it hard to adopt them in practical rendering applications. In this paper, we propose an adaptive method for B-spline volume representation of measured BRDF data. It basically performs approximate B-spline volume lofting, which decomposes the problem into three sub-problems of multiple B-spline curve fitting along u-, v-, and w-parametric directions. Especially, it makes the efficient use of knots in the multiple B-spline curve fitting and thereby accomplishes adaptive knot placement along each parametric direction of a resulting B-spline volume. The proposed method is quite useful to realize efficient data reduction while smoothing out the noises and keeping the overall features of BRDF data well. By applying the B-spline volume models of real materials for rendering, we show that the B-spline volume models are effective in preserving the features of material appearance and are suitable for representing BRDF data.

Photorealistic Rendering of Images Formed by Augmented Reality Optical Systems

2018 ◽  
pp. 11-25
Author(s):  
Vladimir Galaktionov ◽  
◽  
A. Garbul ◽  
I. Potyomin ◽  
V. Sokolov ◽  
...  
Keyword(s):  
Augmented Reality ◽  
Optical Systems ◽  
Photorealistic Rendering

scholarly journals Real Color Model of a Cadaver for Deep Brain Stimulation of the Subthalamic Nucleus

2021 ◽  
Vol 11 (11) ◽  
pp. 4999
Author(s):  
Chung-Yoh Kim ◽  
Jin-Seo Park ◽  
Beom-Sun Chung
Keyword(s):  
Deep Brain Stimulation ◽  
Subthalamic Nucleus ◽  
Brain Stimulation ◽  
Magnetic Resonance Images ◽  
Target Point ◽  
Anatomical Structures ◽  
Volume Model ◽  
Segmented Images ◽  
Volume Models ◽  
Deep Brain

When performing deep brain stimulation (DBS) of the subthalamic nucleus, practitioners should interpret the magnetic resonance images (MRI) correctly so they can place the DBS electrode accurately at the target without damaging the other structures. The aim of this study is to provide a real color volume model of a cadaver head that would help medical students and practitioners to better understand the sectional anatomy of DBS surgery. Sectioned images of a cadaver head were reconstructed into a real color volume model with a voxel size of 0.5 mm × 0.5 mm × 0.5 mm. According to preoperative MRIs and postoperative computed tomographys (CT) of 31 patients, a virtual DBS electrode was rendered on the volume model of a cadaver. The volume model was sectioned at the classical and oblique planes to produce real color images. In addition, segmented images of a cadaver head were formed into volume models. On the classical and oblique planes, the anatomical structures around the course of the DBS electrode were identified. The entry point, waypoint, target point, and nearby structures where the DBS electrode could be misplaced were also elucidated. The oblique planes could be understood concretely by comparing the volume model of the sectioned images with that of the segmented images. The real color and high resolution of the volume model enabled observations of minute structures even on the oblique planes. The volume models can be downloaded by users to be correlated with other patients’ data for grasping the anatomical orientation.

scholarly journals Second-order discontinuous Galerkin flood model: Comparison with industry-standard finite volume models

2021 ◽  
Vol 594 ◽  
pp. 125924
Author(s):  
Janice Lynn Ayog ◽  
Georges Kesserwani ◽  
James Shaw ◽  
Mohammad Kazem Sharifian ◽  
Domenico Bau
Keyword(s):  
Discontinuous Galerkin ◽  
Finite Volume ◽  
Model Comparison ◽  
Second Order ◽  
Industry Standard ◽  
Flood Model ◽  
Volume Models

scholarly journals Facial Feature Model for a Portrait Video Stylization

Symmetry ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 442 ◽  
Author(s):  
Dongxue Liang ◽  
Kyoungju Park ◽  
Przemyslaw Krompiec
Keyword(s):  
Facial Feature ◽  
Feature Model ◽  
Facial Features ◽  
Outer Face ◽  
Flow Estimation ◽  
Photorealistic Rendering ◽  
Stroke Models ◽  
The Face ◽  
Face Contour ◽  
Human Faces

With the advent of the deep learning method, portrait video stylization has become more popular. In this paper, we present a robust method for automatically stylizing portrait videos that contain small human faces. By extending the Mask Regions with Convolutional Neural Network features (R-CNN) with a CNN branch which detects the contour landmarks of the face, we divided the input frame into three regions: the region of facial features, the region of the inner face surrounded by 36 face contour landmarks, and the region of the outer face. Besides keeping the facial features region as it is, we used two different stroke models to render the other two regions. During the non-photorealistic rendering (NPR) of the animation video, we combined the deformable strokes and optical flow estimation between adjacent frames to follow the underlying motion coherently. The experimental results demonstrated that our method could not only effectively reserve the small and distinct facial features, but also follow the underlying motion coherently.

scholarly journals Comparative analysis of hydrodynamics of treatment wetlands using finite volume models with empirical data

2014 ◽  
Vol 55 (13) ◽  
pp. 3587-3612 ◽  
Author(s):  
Rattandeep Singh ◽  
Sandeep Gupta ◽  
S. Raman ◽  
Prodyut Chakraborty ◽  
Puneet Sharma ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Finite Volume ◽  
Empirical Data ◽  
Treatment Wetlands ◽  
Volume Models

scholarly journals Photorealistic rendering of mixed reality scenes

2015 ◽  
Vol 34 (2) ◽  
pp. 643-665 ◽  
Author(s):  
Joel Kronander ◽  
Francesco Banterle ◽  
Andrew Gardner ◽  
Ehsan Miandji ◽  
Jonas Unger
Keyword(s):  
Mixed Reality ◽  
Photorealistic Rendering
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