Mr. Sheng Wu Profile

Sheng Wu

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Proceedings Article | 25 March 2024 Paper

Improved anti-aliasing algorithm based on fast approximate anti-aliasing

Jiahao Zou, Zhen Xu, Sheng Wu, Lin Zhou

Proceedings Volume 13089, 130891N (2024) https://doi.org/10.1117/12.3021120

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The Fast Approximate Anti-Aliasing algorithm is one of the most widely used real-time anti-aliasing algorithms in practice in recent years. It has superior low-cost and high-efficiency anti-aliasing processing advantages as a post-processing algorithm. This algorithm directly achieves a real-time anti-aliasing effect on the image vision by blending and smoothing the object edge pixels in the image using blending factors. However, in practice, because the fast approximate anti-aliasing algorithm is based on the pixel blending principle to achieve the visual effect of anti-aliasing, it has the problem of blurring the image screen. To solve this problem, this paper proposes an improved anti-aliasing algorithm based on the fast approximate anti-aliasing algorithm, combining the Laplacian sharpening variant. The general optimization idea of this improved algorithm is to improve the blending factor formula and pixel blending method of the original fast anti-aliasing algorithm and to further sharpen the blended anti-aliasing results using a sharpening kernel. In this way, this algorithm can achieve improvement in the sharpness of the anti-aliasing result image while ensuring the superior real-time performance of it as a post-processing method. The experimental results show that the generating image of this improved anti-aliasing algorithm is sharper compared with the original Fast Approximate Anti-Aliasing algorithm.

Proceedings Article | 14 November 2023 Paper

Improved normal distribution function for skin specular reflection rendering based on GGX distribution

Jiahao Zou, Sheng Wu, Lin Zhou

Proceedings Volume 12934, 129341L (2023) https://doi.org/10.1117/12.3008031

KEYWORDS: Specular reflections, Skin, Attenuation, Statistical analysis, Translucency, Scattering, Bidirectional reflectance transmission function, Optical properties, Light sources and illumination, Visualization

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With the development of subsurface scattering technology in recent years, skin rendering has also increased realism. However, as an important part of skin rendering, specular rendering now mostly still uses the K/S model based on Beckmann’s normal distribution function, which makes skin specular reflection always too concentrated, reducing the realism of rendering. To solve this problem, this paper proposes an improved normal distribution function: GGX-Improved based on the GGX normal distribution function. By introducing a parameter K into the GGX normal distribution function, it can realize the adjustment of the tail length of the K/S model specular reflection while ensuring the shape invariance, to make the skin specular reflection softer and more natural, which enhances the realism of the skin rendering.

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