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11. 发明授权

US07940268B2 Real-time rendering of light-scattering media 有权
标题翻译：实时渲染光散射介质
公开(公告)号：US07940268B2
公开(公告)日：2011-05-10
申请号：US11770942
申请日：2007-06-29
申请人： Kun Zhou , Qiming Hou , Minmin Gong , John Michael Snyder , Baining Guo , Heung-Yeung Shum
发明人： Kun Zhou , Qiming Hou , Minmin Gong , John Michael Snyder , Baining Guo , Heung-Yeung Shum
IPC分类号： G06T15/50 , G06T15/00
CPC分类号： G06T15/506
摘要： A real-time algorithm for rendering an inhomogeneous scattering medium such as fog is described. An input media animation is represented as a sequence of density fields, each of which is decomposed into a weighted sum of a set of radial basis functions (RBFs) such as Gaussians. The algorithm computes airlight and surface reflectance of the inhomogeneous scattering medium. Several approximations are taken which lead to analytical solutions of quantities such as an optical depth integrations and single scattering integrations, and a reduced number of integrations that need to be calculated. The resultant algorithm is able to render inhomogeneous media including their shadowing and scattering effects in real time. The algorithm may be adopted for a variety of light sources including point lights and environmental lights.
摘要翻译：描述了用于渲染非均匀散射介质（如雾）的实时算法。输入媒体动画被表示为密度字段的序列，每个密度字段被分解成一组径向基函数（RBF）如Gauss的加权和。该算法计算不均匀散射介质的气孔和表面反射率。采用几种近似方法，其导致诸如光学深度积分和单一散射积分的量的分析解，以及需要计算的减少的积分数。所得到的算法能够实时渲染包括它们的阴影和散射效应的不均匀介质。该算法可以用于各种光源，包括点光源和环境光源。

12. 发明授权

US07940269B2 Real-time rendering of light-scattering media 有权
标题翻译：实时渲染光散射介质
公开(公告)号：US07940269B2
公开(公告)日：2011-05-10
申请号：US11770974
申请日：2007-06-29
申请人： Kun Zhou , Qiming Hou , Minmin Gong , John Michael Snyder , Baining Guo , Heung-Yeung Shum
发明人： Kun Zhou , Qiming Hou , Minmin Gong , John Michael Snyder , Baining Guo , Heung-Yeung Shum
IPC分类号： G06T15/50 , G06T15/00
CPC分类号： G06T15/50
摘要： A real-time algorithm for rendering of an inhomogeneous scattering medium such as fog with a surface object immersed therein is described. An input media animation is represented as a sequence of density fields. The algorithm computes surface reflectance of the surface object in the inhomogeneous scattering medium. The algorithm may also compute airlight of the inhomogeneous scattering medium. Several approximations are taken which lead to analytical solutions of quantities such as optical depth integrations and single scattering integrations, and a reduced number of integrations that need to be calculated. The resultant algorithm is able to render inhomogeneous media including their shadowing and scattering effects in real time. The algorithm may be adopted for a variety of light sources including point lights and environmental lights.
摘要翻译：描述了用于渲染非均匀散射介质（例如，其中浸入表面物体的雾）的实时算法。输入媒体动画被表示为一系列密度字段。该算法计算非均匀散射介质中表面物体的表面反射率。该算法还可以计算不均匀散射介质的空气光。采用几种近似方法，其导致诸如光学深度积分和单一散射积分的量的分析解，以及需要计算的减少的积分数。所得到的算法能够实时渲染包括它们的阴影和散射效应的不均匀介质。该算法可以用于各种光源，包括点光源和环境光源。

13. 发明授权

US07224356B2 Stretch-driven mesh parameterization using spectral analysis 有权
标题翻译：使用频谱分析的拉伸驱动网格参数化
公开(公告)号：US07224356B2
公开(公告)日：2007-05-29
申请号：US11003814
申请日：2004-12-02
申请人： Kun Zhou , John Michael Snyder , Baining Guo , Heung Yeung Shum
发明人： Kun Zhou , John Michael Snyder , Baining Guo , Heung Yeung Shum
IPC分类号： G06T15/00
CPC分类号： G06T17/20
摘要： A method of performing stretch-driven mesh parameterization. A method of performing stretch-driven mesh parameterization comprising, computing a spectral analysis to parameterize a mesh, and iterating a stretch optimization calculation to further optimize the initial parameterization.
摘要翻译：执行拉伸驱动网格参数化的方法。一种执行拉伸驱动网格参数化的方法，包括：计算频谱分析以参数化网格，以及迭代拉伸优化计算以进一步优化初始参数化。

14. 发明授权

US07233963B2 Systems and methods for diffusing clipping error 失效
标题翻译：用于扩散裁剪错误的系统和方法
公开(公告)号：US07233963B2
公开(公告)日：2007-06-19
申请号：US10103220
申请日：2002-03-20
申请人： John Michael Snyder
发明人： John Michael Snyder
IPC分类号： G06F15/00
CPC分类号： H04N19/126 , H04N19/136 , H04N19/182 , H04N19/80 , H04N19/90
摘要： Systems and methods are provided for diffusing clipping error in a computing system. When a data set contains values which are to be restricted to a range, and the data set includes one or more values which are beyond the range, the invention provides methodology that is an improvement over clipping extraneous values to the range or squeezing the values to the range. Advantageously, systems and methods are provided for distributing or diffusing error to neighboring samples of the data set, thereby spreading localized error, and minimizing the effects associated with remapping the data set to the restrictive range.
摘要翻译：提供了系统和方法用于在计算系统中扩散裁剪错误。当数据集包含要限制在一个范围内的数值时，并且该数据集包括一个或多个超出该范围的值时，本发明提供了一种方法，该方法是对将范围外的额外值或将值挤压到范围。有利地，提供了系统和方法用于将误差分布或扩散到数据集的相邻采样，由此扩展局部化误差，并使与数据集的重新映射相关联的影响最小化到限制范围。

15. 发明授权

US07224358B2 Systems and methods for optimizing geometric stretch of a parametrization scheme 有权
标题翻译：用于优化参数化方案的几何拉伸的系统和方法
公开(公告)号：US07224358B2
公开(公告)日：2007-05-29
申请号：US10901826
申请日：2004-07-28
申请人： Hugues Herve Hoppe , John Michael Snyder , Pedro Vieira Sander , Steven Jacob Gortler
发明人： Hugues Herve Hoppe , John Michael Snyder , Pedro Vieira Sander , Steven Jacob Gortler
IPC分类号： G06T17/00
CPC分类号： G06T17/20
摘要： Systems and methods are provided for optimizing the geometric stretch of a parametrization scheme. Given an arbitrary mesh, the systems and methods construct a progressive mesh (PM) such that all meshes in the PM sequence share a common texture parametrization. The systems and methods minimize geometric stretch, i.e., small texture distances mapped onto large surface distances, to balance sampling rates over all locations and directions on the surface. The systems and methods also minimize texture deviation, i.e., “slippage” error based on parametric correspondence, to obtain accurate textured mesh approximations. The technique(s) begin by partitioning the mesh into charts using planarity and compactness heuristics. Then, the technique(s) proceed by creating a stretch-minimizing parametrization within each chart, and by resizing the charts based on the resulting stretch. Then, the technique(s) simplify the mesh while respecting the chart boundaries. Next, the parametrization is re-optimized to reduce both stretch and deviation over the whole PM sequence. The charts may then be packed into a texture atlas for improved texture mapping in connection with a parametrization scheme.
摘要翻译：提供了用于优化参数化方案的几何拉伸的系统和方法。给定任意网格，系统和方法构造渐进网格（PM），使得PM序列中的所有网格共享共同的纹理参数化。系统和方法使几何拉伸最小化，即映射到大表面距离上的小纹理距离，以平衡表面上所有位置和方向上的采样率。系统和方法还使纹理偏差最小化，即基于参数对应的“滑移”误差，以获得精确的纹理网格近似。该技术首先将网格划分为使用平面性和紧凑性启发式的图表。然后，通过在每个图表内创建拉伸最小化参数化，并且基于所得的拉伸来调整图表大小来继续进行该技术。然后，技术简化网格，同时遵循图表边界。接下来，参数化被重新优化以减少整个PM序列的拉伸和偏差。然后可以将图表打包到纹理图集中，以改进与参数化方案相关的纹理映射。

16. 发明授权

US07120311B2 Systems and methods for providing forward mapping with visibility for and resolution of accumulated samples 有权
标题翻译：用于提供向前映射的系统和方法，具有对累积样本的可见性和分辨率
公开(公告)号：US07120311B2
公开(公告)日：2006-10-10
申请号：US10186990
申请日：2002-06-28
申请人： John Michael Snyder
发明人： John Michael Snyder
IPC分类号： G06K9/36 , G06T15/40
CPC分类号： G06T15/04 , G06T15/405
摘要： Forward mapping is provided, which accumulates and resolves over all samples forward mapped to each pixel bin. During accumulation and resolution of each of the samples, since a point sample from a forefront object and a point sample from an occluded object may be received by the same bin, wherein only the former should be accumulated and resolved according to the accumulation and resolution process, a Z-range, or Z-interval, is assigned to each sample instead of the conventional Z-value. The Z-range is a function of the Z-value. Analysis of the overlapping of these Z-ranges then determines which samples are to be accumulated and resolved together according to the accumulation and resolution process, and which are not.
摘要翻译：提供前向映射，其累加并解析所有正向映射到每个像素块的样本。在每个样本的累积和解析期间，由于来自前端对象的点样本和来自闭塞对象的点样本可以由同一个仓接收，其中只有前者应该根据累积和解析过程被累积和解决，Z范围或Z间隔被分配给每个样本，而不是传统的Z值。 Z范围是Z值的函数。然后分析这些Z范围的重叠，然后根据累积和解析过程确定要累积和解析哪些样本，哪些不是。

17. 发明授权

US09432790B2 Real-time sound propagation for dynamic sources 有权
标题翻译：动态源的实时声音传播
公开(公告)号：US09432790B2
公开(公告)日：2016-08-30
申请号：US12573157
申请日：2009-10-05
申请人： Nikunj Raghuvanshi , John Michael Snyder , Ming Chieh Lin , Naga K. Govindaraju
发明人： Nikunj Raghuvanshi , John Michael Snyder , Ming Chieh Lin , Naga K. Govindaraju
IPC分类号： H04R5/00 , H04S7/00 , A63F13/54 , H04M3/56
CPC分类号： H04S7/30 , A63F13/54 , A63F2300/6081 , G10H2250/531 , H04M3/56 , H04S7/302 , H04S7/305 , H04S2400/11
摘要： Described herein are techniques pertaining to real-time propagation of an arbitrary audio signal in a fixed virtual environment with dynamic audio sources and receivers. A wave-based numerical simulator is configured to compute response signals in the virtual environment with respect to a sample signal at various source and receiver locations. The response signals are compressed and placed in the frequency domain to generate frequency responses. Such frequency responses are selectively convolved with the arbitrary audio signal to allow real-time propagation with moving sources and receivers in the virtual environment.
摘要翻译：这里描述的是与具有动态音频源和接收器的固定虚拟环境中的任意音频信号的实时传播有关的技术。基于波形的数值模拟器被配置为相对于在各种源和接收器位置处的采样信号计算虚拟环境中的响应信号。响应信号被压缩并放置在频域中以产生频率响应。这种频率响应与任意音频信号选择性卷积，以允许与虚拟环境中的移动源和接收器的实时传播。

18. 发明授权

US07425954B2 Systems and methods for providing signal-specialized parametrization 有权
标题翻译：提供信号专门参数化的系统和方法
公开(公告)号：US07425954B2
公开(公告)日：2008-09-16
申请号：US11145196
申请日：2005-06-03
申请人： Hugues Herve Hoppe , John Michael Snyder , Pedro Vieira Sander , Steven Jacob Gortler
发明人： Hugues Herve Hoppe , John Michael Snyder , Pedro Vieira Sander , Steven Jacob Gortler
IPC分类号： G06T17/20
CPC分类号： G06T17/205 , G06T17/20
摘要： Systems and methods are provided for optimizing a parametrization scheme in accordance with information about the surface signal. A surface parametrization is created to store a given surface signal into a texture image. The signal-specialized metric of the invention minimizes signal approximation error, i.e., the difference between the original surface signal and its reconstruction from the sampled texture. A signal-stretch parametrization metric is derived based on a Taylor expansion of signal error. For fast evaluation, the metric of the invention is pre-integrated over the surface as a metric tensor. The resulting parametrizations have increased texture resolution in surface regions with greater signal detail. Compared to traditional geometric parametrizations, the number of texture samples can often be reduced by a significant factor for a desired signal accuracy.
摘要翻译：提供的系统和方法用于根据关于表面信号的信息优化参数化方案。创建表面参数以将给定的表面信号存储到纹理图像中。本发明的信号专用度量使信号近似误差最小化，即原始表面信号与其从采样纹理的重构之间的差异。基于信号误差的泰勒扩展导出信号拉伸参数度量。为了快速评估，本发明的度量作为度量张量在表面上预先集成。所产生的参数化在具有更大信号细节的表面区域中增加了纹理分辨率。与传统的几何参数化相比，纹理样本的数量通常可以通过一个重要的因素来减少所需的信号精度。

19. 发明授权

US07262771B2 Systems and methods for all-frequency relighting using spherical harmonics and point light distributions 有权
标题翻译：使用球面谐波和点光分布进行全频重启的系统和方法
公开(公告)号：US07262771B2
公开(公告)日：2007-08-28
申请号：US10815140
申请日：2004-03-31
申请人： John Michael Snyder , Peter-Pike Johannes Sloan , Yi-Ren Ng
发明人： John Michael Snyder , Peter-Pike Johannes Sloan , Yi-Ren Ng
IPC分类号： G06T15/50
CPC分类号： G06T15/506
摘要： Computer graphics systems and methods for all-frequency relighting are described. In one described embodiment, all-frequency relighting is achieved by representing low frequencies of lighting with spherical harmonics and approximating the residual high-frequency energy with point lights. In another embodiment low-frequencies are rendered with precomputed radiance transfer (PRT) techniques while the higher-frequencies are rendered with on-the-fly techniques.
摘要翻译：描述了用于全频重启的计算机图形系统和方法。在一个所描述的实施例中，通过用球面谐波表示低频照明并用点灯近似残余的高频能量来实现全频重启。在另一个实施例中，使用预计算辐射传输（PRT）技术渲染低频，而使用即时技术渲染较高频率。

20. 发明授权

US07230623B2 Systems and methods for optimizing geometric stretch of a parametrization scheme 有权
公开(公告)号：US07230623B2
公开(公告)日：2007-06-12
申请号：US10981228
申请日：2004-11-04
申请人： Hugues Herve Hoppe , John Michael Snyder , Pedro Vieira Sander , Steven Jacob Gortier
发明人： Hugues Herve Hoppe , John Michael Snyder , Pedro Vieira Sander , Steven Jacob Gortier
IPC分类号： G06T17/00
CPC分类号： G06T17/20
摘要： Systems and methods are provided for optimizing the geometric stretch of a parametrization scheme. Given an arbitrary mesh, the systems and methods construct a progressive mesh (PM) such that all meshes in the PM sequence share a common texture parametrization. The systems and methods minimize geometric stretch, i.e., small texture distances mapped onto large surface distances, to balance sampling rates over all locations and directions on the surface. The systems and methods also minimize texture deviation, i.e., “slippage” error based on parametric correspondence, to obtain accurate textured mesh approximations. The technique(s) begin by partitioning the mesh into charts using planarity and compactness heuristics. Then, the technique(s) proceed by creating a stretch-minimizing parametrization within each chart, and by resizing the charts based on the resulting stretch. Then, the technique(s) simplify the mesh while respecting the chart boundaries. Next, the parametrization is re-optimized to reduce both stretch and deviation over the whole PM sequence. The charts may then be packed into a texture atlas for improved texture mapping in connection with a parametrization scheme.

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