{"title":"Image-pair-based anisotropic material modeling","authors":"J. Feng, Wangyu Xiao, Bingfeng Zhou","doi":"10.1145/2542355.2542376","DOIUrl":"https://doi.org/10.1145/2542355.2542376","url":null,"abstract":"We present a method for modeling anisotropic materials with only two images taken by an ordinary camera, one under diffuse light which we call texture image, and the other under point light named hightlighted image. First we decompose the input images into reflectance image and illumination image. Then we use the intrinsic images to obtain the reflectance property and geometry information of the material, including a group of BRDF parameters, an orientation field and a height field. Then images can be rendered with these information under new lighting and viewing conditions.","PeriodicalId":232593,"journal":{"name":"SIGGRAPH Asia 2013 Technical Briefs","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132268817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Geometric algebra rotors for skinned character animation blending","authors":"G. Papagiannakis","doi":"10.1145/2542355.2542369","DOIUrl":"https://doi.org/10.1145/2542355.2542369","url":null,"abstract":"The main goal and contribution of this work is to show that (automatically generated) computer implementations of geometric algebra (GA) can perform at a faster level compared to standard (dual) quaternion geometry implementations for real-time character animation blending. By this we mean that if some piece of geometry (e.g. Quaternions) is implemented through geometric algebra, the result is as efficient in terms of visual quality and even faster (in terms of computation time and memory usage) as the traditional quaternion and dual quaternion algebra implementation. This should be so even without taking into account certain algorithmic enhancements that geometric algebra may allow in selected applications. This work describes two implementation approaches for quaternion interpolation using Euclidean GA rotors for skinned character animation blending. It also lays the foundation so that GA can be employed for further calculations (skinning, rendering) under a unified geometry computation framework.","PeriodicalId":232593,"journal":{"name":"SIGGRAPH Asia 2013 Technical Briefs","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124387120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Dense scattering layer removal","authors":"Qiong Yan, Li Xu, Jiaya Jia","doi":"10.1145/2542355.2542373","DOIUrl":"https://doi.org/10.1145/2542355.2542373","url":null,"abstract":"We propose a new model, together with advanced optimization, to separate a thick scattering media layer from a single natural image. It is able to handle challenging underwater scenes and images taken in fog and sandstorm, both of which are with significantly reduced visibility. Our method addresses the critical issue -- this is, originally unnoticeable impurities will be greatly magnified after removing the scattering media layer -- with transmission-aware optimization. We introduce non-local structure-aware regularization to properly constrain transmission estimation without introducing the halo artifacts. A selective-neighbor criterion is presented to convert the unconventional constrained optimization problem to an unconstrained one where the latter can be efficiently solved.","PeriodicalId":232593,"journal":{"name":"SIGGRAPH Asia 2013 Technical Briefs","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133034876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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