Recent Research
Results
Tolga Capin
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Mobile
Graphics Research Computer graphics on battery-driven devices such
as mobile phones has emerged as a powerful way of presenting more compelling
content on these devices. Still, the limitations and requirements of the
devices make the situation substantially different from a desktop PC. To that
end, we present a survey of the field of mobile graphics. We
first describe the limitations and requirements unique to mobile
devices. We then review the current solutions in terms of specialized
graphics hardware (including 3D displays), rendering & transmission,
visualization and user interfaces, and how to interact with these devices. In
addition, we present the state-of-the-art in augmented reality on mobile
devices. The survey is concluded with a summary of our thoughts on the
future, and the challenges that lie ahead. Reference: Tolga
Capin, Kari Pulli, Tomas Akenine-Möller, State of the Art in Mobile Graphics
Research, IEEE Computer Graphics and Applications, July/August 2008. |
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3D Hair Sketching
for Real Time Dynamic & Key Frame Animations Physically
based simulation of human hair is a well studied and well known problem. But
the "pure" physically based representation of hair (and other
animation elements) is not the only concern of the animators, who want to
"control" the creation and animation phases of the content. This
paper describes a sketching sketch-based tool, with which a user can both
create hair models with different styling parameters and produce animations
of these created hair models using physically and key frame based techniques.
The model creation and animation production tasks are all performed with
direct manipulation techniques in real time. Reference: Rıfat Aras, Barkın
Başarankut, Tolga Çapın, Bülent Özgüç, 3D Hair Sketching for Real Time Dynamic & Key Frame Animations,
The Visual Computer, June 2008 |
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Key Frame Extraction
from Motion Capture Data by Curve Saliency We have proposed a new method for
extracting key frames from a motion capture sequence. Our proposed approach
consists of two steps. In the first step, we propose a new metric, curve
saliency, for motion curves that specifies the important frames of the motion.
In the second step, we detect the final key frames by clustering the computed
important frames. As a result of our experimental results, on the average, by
using only 3.7% of all frames as key frames, we can represent the captured
motion sequence. Reference: Eyuphan Bulut, Tolga Capin, Key Frame Extraction from Motion Capture
Data by Curve Saliency, Proceedings of CASA 2007 – Computer Animation and
Social Agents, June 2007. |
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Real-Time Animation
of Liquid-Rigid Body Interaction We
have proposed a novel method for the representation and controllability of
viscosity of the liquid as an extension to O’Brien et al.’s work. Since
viscosity is the most discriminative dynamic property of the fluids, such an
extension makes the liquid model a generic and configurable one which can be
customized for use in a real-time virtual environment. We have also proposed
a computationally efficient model for simulating
rigid body interactions with liquids. Reference: Melih Kandemir, Tolga Capin,
Bulent Ozguc, A Framework for Real-Time Animation of Liquid-Rigid Body
Interaction, Proceedings of CGI 2007, May 2007. |
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Mobile Camera Based
User Interaction We
have developed an approach for user interaction on mobile devices, focusing on
camera-enabled mobile phones. A user interacts with an application by moving
their device, and the captured camera video is used to estimate phone motion
or interact with the real world. We
present a prototype implementation and researched various ways how phone
motion can be used for different tasks -- such as navigating through large
number of media files, and phone motion and shake detection for gaming. The
results and discussion may guide interface designers when targeting
camera-based user interfaces. Reference: Tolga Capin, Antonio Haro, Mobile
Camera Based User Interaction, in
Handbook of Research on User Interface Design and Evaluation for Mobile
Technology, Idea Group, 2007. |
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A Unified Graphics
Rendering Pipeline for Autostereoscopic Rendering Autostereoscopic
displays require rendering a scene from multiple viewpoints. However, the
architecture of current generation graphics processors are still grounded in
the historic evolution of monoscopic rendering. We present a novel
programmable rendering pipeline that renders to multiple viewpoints in a
single pass. Our approach leverages on the computational and memory fetch
coherence of rendering to multiple viewpoints to achieve significant speedup.
We present an emulation of the principles of our pipeline using the current
generation of GPUs and present a quantitative estimate of the benefits of our
approach. We make a case for the new rendering pipeline by demonstrating its
benefits for a range of applications such as autostereoscopic rendering and
for shadow map computation for a scene with multiple light sources. Reference: Aravind Kalaiah, Tolga Capin,
Unified Rendering Pipeline for Autostereoscopic Displays, 3DTV Conference,
May 2007 (forthcoming). |
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MORE: ‘Rich
media’ is a term that implies the integration of all of the advances we have
made in the mobile space delivering music, speech, text, graphics and video.
This is more than the sum of its parts. Rich media is the ability to deliver
these modalities, to interact with these modalities, and to do it in a way
that allows for the construction, delivery and use of compelling mobile
services in an effective and economic manner. In this work, we have
introduced a system called Mobile Open Rich-media Environment (‘MORE’) that
helps realize such mobile rich media services, combining various technologies
of W3C, OMA, 3GPP and IETF standards. The different components of the system
include formatting, packaging, transporting, rendering and interacting with
rich media files and streams. Reference: Setlur, V., Capin, T., Chitturi,
S., Vedantham, R., and Ingrassia, M., MORE: Mobile Open Rich-media
Environment, IEEE International Conference on Multimedia and Expo (ICME),
2006. |
