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1. 发明授权

US07075534B2 Method and system for automatically generating factored approximations for arbitrary bidirectional reflectance distribution functions 失效
公开(公告)号：US07075534B2
公开(公告)日：2006-07-11
申请号：US10465055
申请日：2003-06-19
申请人： Forrester Hardenbergh Cole , Steven J. Gortler
发明人： Forrester Hardenbergh Cole , Steven J. Gortler
IPC分类号： G06T15/50
CPC分类号： G06T15/506
摘要： A method and a system are presented to generate automatically factored approximations for arbitrary Bidirectional Reflectance Distribution Functions (BRDFs). The method presented extends previous work to include a search over a space of 4D to 2D projections. Each set of projections defines a set of factors, which in turn defines an approximation error. This error is minimized using a conventional multi-dimensional search algorithm. A new representation for the projection functions is presented that allows efficient searching and enables the construction of a full approximation of a BRDF from the set of its optimal factors and the computation of reflectance values for arbitrary viewing angles using the function's full approximation.

2. 发明授权

US07265752B2 Multi-chart geometry images 有权
标题翻译：多图几何图像
公开(公告)号：US07265752B2
公开(公告)日：2007-09-04
申请号：US10755206
申请日：2004-01-09
申请人： Pedro V. Sander , Zoe J. Wood , Steven J. Gortler , John M. Snyder , Hugues H. Hoppe
发明人： Pedro V. Sander , Zoe J. Wood , Steven J. Gortler , John M. Snyder , Hugues H. Hoppe
IPC分类号： G06T15/00
CPC分类号： G06T17/20
摘要： Techniques and tools for mesh processing are described. For example, a multi-chart geometry image represents arbitrary surfaces on object models. The multi-chart geometry image is created by resampling a surface onto a regular 2D grid, using a flexible atlas construction to map the surface piecewise onto charts of arbitrary shape. This added flexibility reduces parameterization distortion and thus provides greater geometric fidelity, particularly for shapes with long extremities, high genus, or disconnected components. As another example, zippering creates a watertight surface on reconstructed triangle meshes. The zippering unifies discrete paths of samples along chart boundaries to form the watertight mesh.
摘要翻译：描述了网格处理的技术和工具。例如，多图几何图形表示对象模型上的任意曲面。多图几何图像是通过将表面重新采样到常规2D网格上，使用灵活的图谱结构将表面分段映射到任意形状的图表上创建的。这种增加的灵活性降低了参数化失真，从而提供更大的几何保真度，特别是对于具有长末端，高类别或断开组件的形状。作为另一个例子，拉链在重建的三角形网格上形成水密表面。拉链将样本的离散路径与图表边界统一起来形成水密网格。

3. 发明授权

US06919906B2 Discontinuity edge overdraw 失效
标题翻译：不连续边缘过度展开
公开(公告)号：US06919906B2
公开(公告)日：2005-07-19
申请号：US09851701
申请日：2001-05-08
申请人： Hugues Hoppe , John Michael Snyder , Pedro Vieira Sander , Steven J. Gortler
发明人： Hugues Hoppe , John Michael Snyder , Pedro Vieira Sander , Steven J. Gortler
IPC分类号： G06T15/50 , G06K9/40 , G09G5/00
CPC分类号： G06T15/503
摘要： Reduction of aliasing artifacts along discontinuity edges of a rendered polygon mesh is achieved by overdrawing the edges as antialiased lines. The discontinuity edges are oriented consistently and blended as they approach silhouettes in the mesh to avoid popping at the edge, thereby achieving a temporal smoothness at the silhouettes. This temporal smoothness is balanced with a competing desire to maintain spatial sharpness by utilizing an asymmetric blending technique. To further improve results, the discontinuity edges can be sorted by depth prior to overdrawing them. These processes are effective at reducing the temporal artifact known as “crawling jaggies”.
摘要翻译：通过将边缘作为抗锯齿线重新绘制来实现沿渲染多边形网格的不连续边缘减少混叠伪影。不连续边缘被一致地定向并且在它们接近网格中的轮廓时进行混合，以避免在边缘处弹出，从而在轮廓上实现时间平滑。通过利用不对称共混技术来保持空间锐度的竞争欲望平衡了这个时间平滑度。为了进一步改善结果，不连续边缘可以在超过它们之前按深度进行排序。这些过程在减少被称为“爬行锯齿”的时间假象方面是有效的。

4. 发明授权

US6009188A Method and system for digital plenoptic imaging 失效
公开(公告)号：US6009188A
公开(公告)日：1999-12-28
申请号：US620830
申请日：1996-03-20
申请人： Michael F. Cohen , Steven J. Gortler , Radek Grzeszczuk , Richard S. Szeliski
发明人： Michael F. Cohen , Steven J. Gortler , Radek Grzeszczuk , Richard S. Szeliski
IPC分类号： G06T15/06 , G06T15/50 , G06T15/00
CPC分类号： G06T15/50 , G06T15/06
摘要： A computer-based method and system for digital 3-dimensional imaging of an object which allows for viewing images of the object from arbitrary vantage points. The system, referred to as the Lumigraph system, collects a complete appearance of either a synthetic or real object (or a scene), stores a representation of the appearance, and uses the representation to render images of the object from any vantage point. The appearance of an object is a collection of light rays that emanate from the object in all directions. The system stores the representation of the appearance as a set of coefficients of a 4-dimensional function, referred to as the Lumigraph function. From the Lumigraph function with these coefficients, the Lumigraph system can generate 2-dimensional images of the object from any vantage point. The Lumigraph system generates an image by evaluating the Lumigraph function to identify the intensity values of light rays that would emanate from the object to form the image. The Lumigraph system then combines these intensity values to form the image.

5. 发明授权

US07586488B2 Multi-chart geometry images 有权
标题翻译：多图几何图像
公开(公告)号：US07586488B2
公开(公告)日：2009-09-08
申请号：US11895179
申请日：2007-08-22
申请人： Pedro V. Sander , Zoe J. Wood , Steven J. Gortler , John M. Snyder , Hugues H. Hoppe
发明人： Pedro V. Sander , Zoe J. Wood , Steven J. Gortler , John M. Snyder , Hugues H. Hoppe
IPC分类号： G06T15/00
CPC分类号： G06T17/20
摘要： Techniques and tools for mesh processing are described. For example, a multi-chart geometry image represents arbitrary surfaces on object models. The multi-chart geometry image is created by resampling a surface onto a regular 2D grid, using a flexible atlas construction to map the surface piecewise onto charts of arbitrary shape. This added flexibility reduces parameterization distortion and thus provides greater geometric fidelity, particularly for shapes with long extremities, high genus, or disconnected components. As another example, zippering creates a watertight surface on reconstructed triangle meshes. The zippering unifies discrete paths of samples along chart boundaries to form the watertight mesh.
摘要翻译：描述了网格处理的技术和工具。例如，多图几何图形表示对象模型上的任意曲面。多图几何图像是通过将表面重新采样到常规2D网格上，使用灵活的图谱结构将表面分段映射到任意形状的图表上创建的。这种增加的灵活性降低了参数化失真，从而提供更大的几何保真度，特别是对于具有长末端，高类别或断开组件的形状。作为另一个例子，拉链在重建的三角形网格上形成水密表面。拉链将样本的离散路径与图表边界统一起来形成水密网格。

6. 发明授权

US07286138B2 Discontinuity edge overdraw 有权
标题翻译：不连续边缘过度展开
公开(公告)号：US07286138B2
公开(公告)日：2007-10-23
申请号：US11062688
申请日：2005-02-22
申请人： Hugues Hoppe , John Michael Snyder , Pedro Vieira Sander , Steven J. Gortler
发明人： Hugues Hoppe , John Michael Snyder , Pedro Vieira Sander , Steven J. Gortler
IPC分类号： G06K9/40 , G09G5/00 , G06T15/50 , H04N5/225
CPC分类号： G06T15/503
摘要： Systems and methods for discontinuity edge overdraw are described. In one aspect, a polygonal mesh is rendered to produce a computer-generated image. The image exhibits aliasing at its discontinuity edges. The discontinuity edges are sorted prior to overdrawing. The discontinuity edges are overdrawn as anti-aliased lines to reduce the aliasing.
摘要翻译：描述了不连续边缘覆盖的系统和方法。在一个方面，渲染多边形网格以产生计算机生成的图像。图像在其不连续边缘处显示出混叠。不连续边缘在过度抽取之前进行排序。不连续边缘作为抗锯齿线被透支，以减少混叠。

7. 发明授权

US06466207B1 Real-time image rendering with layered depth images 失效
标题翻译：实时图像渲染与分层深度图像
公开(公告)号：US06466207B1
公开(公告)日：2002-10-15
申请号：US09040941
申请日：1998-03-18
申请人： Steven J. Gortler , Li-wei He , Michael F. Cohen
发明人： Steven J. Gortler , Li-wei He , Michael F. Cohen
IPC分类号： G06T1510
CPC分类号： G06T15/205
摘要： A method and computer product for rendering real-time three-dimensional images on a display based on view manipulation of prestored depth images in a global coordinate space. First, a layered depth image is generated from multiple depth images based on a predetermined display viewpoint. If the determined viewpoint is within a predetermined threshold of the layered depth image, the generated layered depth image is warped based on the determined display viewpoint, pixels from the layered depth image are splatted onto the warped image, and an output image is generated and displayed based on the splat pixels. If the determined viewpoint is outside the predetermined threshold of the previously generated layered depth image, a next closest layered depth image is generated. If the next closest layered depth image is not fully generated, the previously generated layered depth image is used to generate an output image. If the next closest layered depth image is fully generated, the process is repeated for the generated next closest layered depth image.
摘要翻译：一种用于基于在全局坐标空间中预先存储的深度图像的视图操纵在显示器上呈现实时三维图像的方法和计算机产品。首先，基于预定的显示视点从多个深度图像生成分层深度图像。如果所确定的视点在分层深度图像的预定阈值内，则基于所确定的显示视点来扭曲所生成的分层深度图像，并将来自分层深度图像的像素分解成弯曲图像，并且生成并显示输出图像基于splat像素。如果确定的视点在先前生成的分层深度图像的预定阈值之外，则生成下一个最接近的分层深度图像。如果未完全生成下一个最接近的分层深度图像，则使用先前生成的分层深度图像来生成输出图像。如果完全生成下一个最接近的分层深度图像，则对于生成的下一个最近的分层深度图像重复该过程。

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