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METHOD FOR REAL TIME SPECIAL ILLUMINATION OF 3-D POLYGONAL SYNTHESIZED HEAD MOUTH CAVITY OBJECTS (TEETH AND TONGUE) USING A SIMPLIFIED RAY-TRACING TECHNIQUE

IP.com Disclosure Number: IPCOM000021647D
Publication Date: 2004-Jan-28
Document File: 5 page(s) / 262K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for real-time special illumination of three-dimensional (3-D) polygonal objects using a simplified ray-tracing technique. Benefits include improved functionality, improved performance, and improved ease of implementation.

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METHOD FOR REAL TIME SPECIAL ILLUMINATION OF 3-D POLYGONAL SYNTHESIZED HEAD MOUTH CAVITY OBJECTS (TEETH AND TONGUE) USING A SIMPLIFIED RAY-TRACING TECHNIQUE

Disclosed is a method for real-time special illumination of three-dimensional (3-D) polygonal objects using a simplified ray-tracing technique. Benefits include improved functionality, improved performance, and improved ease of implementation.

Background

         In the conventional computer world, synthesized human images are sure to find a paying place in the market. Some possible applications include:

•         Advanced telecommunication (3-D phones and video-conferencing)

•         Games

•         Electronic services

•         Human/machine interfaces

•         Narration

•         Educational applications

         For these and other applications, a realistic appearance of a synthesized head and facial features is desirable. The image is activated with real-time animation and rendering. The speech process should be realistic, including the motion of the synthesized model's lips, teeth, and tongue. The illumination of the mouth category is complex but is required to enhance the degree of realism.

         Conventionally, two main approaches to 3-D polygonal mouth-cavity illumination exist. The ray tracing (radiocity) technique, provides excellent results but typically does not work successfully in realtime even on fastest computers. The standard real-time visualization libraries do not take into account light-source obscuring by scene objects and do not calculate shadows (use the Phong illumination model and the Gouraud shading model). The result is unnatural homogeneous illumination where extensive shadow areas should appear because light cannot penetrate through the skin and teeth. Additionally, the well-known method for shadows creation by mouth contour projection to mouth cavity objects requires extensive computations because tongue and teeth surfaces are complicated. The mouth cavity requires illumination recalculation on every frame due to changes in the mouth shape during the speech process and significant changes in the shadow areas.

General description

         The disclosed method is real-time special illumination of 3-D polygonal human facial image models mouth cavity objects (teeth and tongue) using simplified ray-tracing technique within the framework of the simple Phong illumination model and the Gouraud shading model. The method is simple to implement, is compatible with standard widespread 3-D visualization libraries and provides good results.

Advantages

         Some implementations of the disclosed structure and method provide one or more of the following advantages:

•         Improved functionality due to providing a simplified ray-tracing technique

•         Improved functionality due to providing graphics processing that can be used with mobile device processors

•         Improved functionality due to providing realistic, soft shadows

•         Improved performance due to providing a simplified algorithm

•         Improved ease of implementation due to compatibility with st...