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HairStyle Boys 2018

Hair plays an important role in human face imag- ing. Hair acts as a ™medium∫ to express character- istics, conditions, and feelings [1, 2]. When the computer graphics (CG) character nods or shakes his (or her) head to express ™Yes∫ or ™No∫, the mo- tion of hair will affect the realism of the image. The CG characters or faces have been used recent- ly in advanced interfaces with multimedia func- tions, such as in anthropomorphic interfaces. How- ever, it is still difficult and time consuming to syn- thesize realistic 3D CG hair images for these char- acters. The difficulty of hair image synthesis is due to the inherent properties of hair, such as the ex- tremely huge number of hair strands. This makes hair image synthesis computationally very expen- sive [3]. 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 elec- tricity, strand-to-strand and strand-to-head inter- actions, articles such as hair pins, hair bands, mousse, hair grease, and so on. Thus, it is ex- tremely difficult to generate complicated hair styles with only a physical formula, some mathe- matical formulas and some parameters. All these properties of hair make hair image synthesis a very challenging task. The previous approaches to hair image synthesis can be divided into two categories: the explicit model [4±9] and the volume density model [10± 13], according to the methods used. The explicit model is very intuitive. The modeling and render- ing target of such an approach is each individual hair strand. The rendering target, hair, is treated in a microscopic way. The particle model for hair synthesis is classified in this category. In contrast, the volume density model defines the 3D space distribution function(s) of the entire hair style, and then applies a ray-tracing technique to calcu- late the color and illumination on the silhouette surface of hair style. This kind of approach views hair styles macroscopically. The approach of the volume density model is more abstract than that of the explicit model. It is not the purpose of this paper to judge which method is superior. However, considering the needs of presenting enormous vari- hairstyle boys and girls

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