A Fast Rendering Method for a Scene with Participating Media of Anisotropic Scattering Property

Stony Brook,New York, USA, June22-24 2005This paper presents an efficient technique for global illumination rendering of a scene with participating media. The rendering handling participating media is performed by ray marching method, which requires sampling along each view direction. The step size of the ray marching must be taken short to generate a high quality image and thus leads to very long computational time. One possible method to improve the computational cost is to exploit importance sampling.In this paper, we propose a method to determine the step size based on the importance sampling technique. For efficient sampling, the probability density function which is ”close” to the radiance distribution is required. In our method, 3D space is divided into a set of uniform grids.The radiance distribution is approximated using the grid structure. To deal with the participating media which has anisotropic scattering property, we use spherical harmonics to represent directional dependence of radiance distribution.Using this grid-based representation, fast calculation of good approximation of desirable probability density is made possible. Using this probability, high quality image can be rendered with fewer numberArticleComputer Graphics International 2005 (CGI2005):227-233 2005conference pape

“Texts From Hillary:” Political Meta-meming, Likeability, and Social Presence

In the age of viral social sharing, memes have become an increasingly important way for the public to engage in political debate and discussion. Through social media, politicians have an opportunity to participate in meme sharing with their followers, and to gain valuable likeability points with them by doing so. Hillary Clinton is one such politician, who created a meta-meme by participating in a viral meme about her, and was able to have some control over the narrative about her image as a result. The present research examined the uses of and responses to political meta-meming through analysis of both Hillary Clinton’s meta-memes and the reactions to them in the news media as shared on social media. This thesis used a theoretical foundation of social presence theory, which in recent years has come to be used in a social media setting and can predict likeability based on effective participation in social media norms. Analysis was conducted through the lens of the femininity/competency bind to center an understanding of Hillary Clinton’s image

Synthetic aperture laser optical feedback imaging using a translational scanning with galvanometric mirrors

In this paper we present an experimental setup based on Laser Optical Feedback Imaging (LOFI) and on Synthetic Aperture (SA) with translational scanning by galvanometric mirrors for the purpose of making deep and resolved images through scattering media. We provide real 2D optical synthetic-aperture image of a fixed scattering target with a moving aperture and an isotropic resolution. We demonstrate theoretically and experimentally that we can keep microscope resolution beyond the working distance. A photometric balance is made and we show that the number of photons participating in the final image decreases with the square of the reconstruction distance. This degradation is partially compensated by the high sensitivity of LOFI

Recalling, Sharing and Participating in a Social Media Intervention Promoting HIV Testing: A Longitudinal Analysis of HIV Testing Among MSM in China.

Social media interventions may enhance HIV services among key populations, including men who have sex with men (MSM). This longitudinal analysis examined the effect of recalling, sharing, and participating in different components of a social media intervention on HIV testing among MSM. The social media intervention included six images/texts and information about an online local community contest to promote testing. Of the 1033 men, they recalled a mean of 2.7 out of six images and shared an average of one image online. 34.5% of men recalled information on the online local community contest and engaged in a mean of 1.3 contest. Recalling images/texts (aOR = 1.13, 95% CI 1.02-1.25) and recalling a local contest (aOR = 1.59, 95% CI 1.13-1.24) were associated with facility-based HIV testing. This study has implications for the development and evaluation of social media interventions to promote HIV testing

AXES at TRECVid 2011

The AXES project participated in the interactive known-item search task (KIS) and the interactive instance search task (INS) for TRECVid 2011. We used the same system architecture and a nearly identical user interface for both the KIS and INS tasks. Both systems made use of text search on ASR, visual concept detectors, and visual similarity search. The user experiments were carried out with media professionals and media students at the Netherlands Institute for Sound and Vision, with media professionals performing the KIS task and media students participating in the INS task. This paper describes the results and findings of our experiments