Fast BTF Texture Modelling
Fast BTF Texture Modelling
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快速 BTF 纹理建模
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
J. Filip
中科院分区：
文献类型：
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作者：
M. Haindl;J. Filip
本文提出了一种新的快速基于模型的算法，现实的多光谱BTF纹理建模可能能够直接实现内的图形卡处理单元。该算法首先对BTF纹理进行范围图估计，然后对输入多光谱纹理图像进行光谱和空间分解。单个正交单谱带限因子由其专用的高斯马尔可夫随机场模型（GMRF）独立建模。我们估计每个GMRF的最佳上下文邻域和参数。最后将单个合成的带限因子折叠成高分辨率的单光谱图像，并利用逆Karhunen-Loeve变换得到平滑的多光谱纹理。多光谱和范围信息都被组合在渲染硬件的凹凸映射或替代地位移映射滤波器中。该模型提供了其他基于采样的BTF纹理合成方法无法达到的巨大的BTF纹理压缩比。
This paper presents a novel fast model-based algorithm for realistic multispectral BTF texture modelling potentially capable of direct implementation inside the graphical card processing unit. The algorithm starts with range map estimation of the BTF texture followed by the spectral and spatial factorisation of an input multispectral texture image. Single orthogonal monospectral band-limited factors are independently modelled by their dedicated Gaussian Markov random field models (GMRF). We estimate an optimal contextual neighbourhood and parameters for each GMRF. Finally single synthesised band-limited factors are collapsed into the fine resolution monospectral images and using the inverse Karhunen-Loeve transformation we obtain the smooth multispectral texture. Both multispectral and range information is combined in a bump mapping or alternatively a displacement mapping filter of the rendering hardware. The presented model offers huge BTF texture compression ration which cannot be achieved by any other sampling-based BTF texture synthesis method.