Friday, May 4, 2012

3D Hair Style Synthesis Based On The Wisp Model

3D hair style
3D Hairstyle

3D Hair Style Synthesis Based On The Wisp Model

Hair plays an important role in the image of the human face. However, it is still difficult and time consuming to synthesize realistic 3D hairstyle images. In this paper, we present an integrated system for 3D computer graphics (CG) hair image synthesis based on a trigonometrical prism wisp model. By applying the trigonometrical prism wisp model, 2D hair distribution maps and other CG techniques to our system, we can successfully and efficiently synthesize realistic CG hair style images. A 3D hairstyle editing tool (HET) is incorporated into the system to support the creation of 3D hairstyle. We have also integrated this system with other research results to construct a system for 3D hairstyle character synthesis.

Introduction
3D Hairstyle Shape
3D Hairstyle Shape
Hair plays an important role in human face imaging. Hair acts as a medium to express characteristics, conditions, and feelings [1, 2]. When the computer graphics (CG) character nods or shakes his (or her) head to express ªYesº or ªNoº, the motion of hair will affect the realism of the image. The CG characters or faces have been used recently in advanced interfaces with multimedia functions, such as in anthropomorphic interfaces. However, it is still difficult and time consuming to synthesize realistic 3D CG hair images for these characters. The difficulty of hair image synthesis is due to the inherent properties of hair, such as the extremely huge number of hair strands. This makes hair image synthesis computationally very expensive. In addition, one hair strand is very thin compared with the pixel size, and hair strands within a wisp are locally parallel. These two properties cause an aliasing problem in rendering hair images. Most important of all, there are huge variations in hair styles, which are determined by extremely complex interactions of many factors. These factors include gravity, friction, static electricity, strand-to-strand and strand-to-head interactions, Marticles such as hair pins, hair bands, mousse, hair grease, and so on. Thus, it is extremely difficult to generate complicated hair styles with only a physical formula, some mathematica formulas and some parameters. All these properties hair make hair image synthesis a very challenging task.
3D Hairstyle
3D Hairstyle


Basic concepts of our system

We first introduce the five basic design concepts
for our system:
1. Reality. We must be able to synthesize hair images very realistically.

2. Low cost. We must be able to synthesize realistic hair images in a much shorter time than with previous methods or systems.

3. High flexibility. Using one and the same hair model, we must be able to create various hair styles with long or short hair, straight or curly hair, and so on.

4. Ability to animate hair styles. The ability to introduce some kind of physical model and formula to emulate the complicated phenomenon of hair is required.

5. Practicality. We want to provide a way to generate and design various 3D hairstyle easily.


3D Model Hairstyle
3D Model Hairstyle
It is quite reasonable and intuitive to consider these five concepts as the basic elements that make a satisfying system for CG hair style synthesis. We have designed our system with these concepts. The modeling method, as the core of the system, is explained in Sect. 3. Some techniques and issues that we consider necessary for realistic hair image synthesis are discussed in Sect. 4. A hair style design and generating tool, the hair style editing tool (HET), is introduced in Sect.

Hairstyle for Man
Hairstyle for Man


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