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Estimating camera parameters from starry night photographs

Computational Visual Media 2020年第4期6卷 445-454页

作者： Naoto Ishikawa yoshinori dobashi Graduate School of Information Science and Technology Hokkaido UniversitySapporoJapan

We propose an efficient, specific method for estimating camera parameters from a single starry night image. Such an image consists of a collection of disks representing stars, so traditional estimation methods for common pictures do not work. Our method uses a database, a star catalog, that stores the positions of stars on the celestial sphere. Our method computes magnitudes(i.e., brightnesses) of stars in the input image and uses them to find the corresponding stars in the star catalog. Camera parameters can then be estimated by a simple geometric calculation. Our method is over ten times faster and more accurate than a previous method.

关键词： astrophotography constellation star identification pattern matching

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Temporal and spatial anti-aliasing for rendering reflections on water waves

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Computational Visual Media 2021年第2期7卷 201-215页

作者： Namo Podee Nelson Max Kei Iwasaki yoshinori dobashi Hokkaido University Sapporo060-0814Japan University of California Davis95616USA Wakayama University Wakayama640-8441Japan

The reflection of a bright light source on a dynamic surface such as water with waves can be difficult to render well in real time due to reflection aliasing and *** this paper,we propose a solution to this problem by approximating the reflection direction distribution for the water surface as an elliptical Gaussian *** we analytically integrate the reflection contribution throughout the rendering interval *** method can render in real time an animation of the time integrated reflection of a spherical light source on highly dynamic waves with reduced aliasing and flickering.

关键词： real-time rendering anti-aliasing reflection water surface water waves elliptical Gaussian

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An interactive rendering system using hierarchical data structure for earth-scale clouds

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Science China(Information Sciences) 2010年第5期53卷 920-931页

作者： dobashi yoshinori YAMAMOTO Tsuyoshi NISHITA Tomoyuki Graduate School of Information Science and Technology Hokkaido University Graduate School of Frontier Science The University of Tokyo

This paper presents an interactive system for realistic visualization of earth-scale clouds. Realistic images can be generated at interactive frame rates while the viewpoint and the sunlight directions can be changed interactively. The realistic display of earth-scale clouds requires us to render large volume data representing the density distribution of the clouds. However, this is generally time-consuming and it is difficult to achieve the interactive performance, especially when the sunlight direction can be changed. To address this, our system precomputes the integrated intensities and opacities of clouds for various viewing and sunlight directions. This idea is combined with a novel hierarchical data structure for further acceleration. The photorealism of the final image is improved by taking into account the atmospheric effects and shadows of clouds on the earth. We demonstrate the usefulness of our system by an application to a space flight simulation.

关键词： computer graphics efficient rendering large-scale clouds level of detail light scattering

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Visual simulation of clouds

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Visual Informatics 2017年第1期1卷 1-8页

作者： yoshinori dobashi Kei Iwasaki Yonghao Yue Tomoyuki Nishita Hokkaido University/UEI Research Japan Wakayama University/UEI Research Japan The University of Tokyo Japan UEI Research/Hiroshima Shudo University Japan

Clouds play an important role when synthesizing realistic images of outdoor *** realistic display of clouds is therefore one of the important research topics in computer *** order to display realistic clouds,we need methods for modeling,rendering,and animating clouds *** is also important to control the shapes and appearances of clouds to create certain visual *** this paper,we explain our efforts and research results to meet such requirements,together with related researches on the visual simulation of clouds.

关键词： Clouds Procedural modeling Image-based modeling Fluid simulation Feedback control Genetic algorithms

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