公开(公告)号：US20100033482A1

公开(公告)日：2010-02-11

申请号：US12189763

申请日：2008-08-11

申请人： Kun Zhou ,  Xin Sun ,  Eric Stollnitz ,  Baining Guo

发明人： Kun Zhou ,  Xin Sun ,  Eric Stollnitz ,  Baining Guo

IPC分类号： G06T17/00

CPC分类号： G06T15/06 ,  G06T15/50

摘要： Dynamic refractive object relighting technique embodiments are presented which involve rendering an image of a refractive object in a dynamic scene by first voxelizing a representation of the surfaces of the object into a volumetric representation in the form of a rectangular voxel grid. A refractive index is assigned to each voxel based on user-input material parameters. Next, the paths of photons are traced in a step-wise manner as each photon refracts through the object. The size of each step forward is variable and based on variations in refractive index of the object. Radiance values are assigned to all the voxels that the photons traverse in their paths through the object. An output image of the refractive object is then rendered from a user-input viewpoint by tracing viewing rays from the viewpoint into the scene and calculating the amount of radiance that reaches the viewpoint along each of the rays.

摘要翻译： 提出了一种动态折射物体重心技术实施例，其包括通过首先将物体表面的表示体视为矩形体素网格形式的体积表示来在动态场景中渲染折射物体的图像。 基于用户输入的材料参数将折射率分配给每个体素。 接下来，当每个光子通过物体折射时，以逐步的方式跟踪光子的路径。 前进的每一步的大小是可变的，并且基于物体的折射率的变化。 辐射值被分配给光子穿过对象的路径中遍历的所有体素。 然后，通过将从视点观看的光线追踪到场景中并且计算沿着每个光线到达视点的辐射量，从用户输入的视点来渲染折射物体的输出图像。

公开(公告)号：US07589720B2

公开(公告)日：2009-09-15

申请号：US10911394

申请日：2004-08-04

申请人： Kun Zhou ,  Baining Guo ,  Heung-Yeung Shum

发明人： Kun Zhou ,  Baining Guo ,  Heung-Yeung Shum

IPC分类号： G06T17/20 ,  G06T15/00 ,  G06T17/00 ,  G09G5/00

CPC分类号： G06T17/205 ,  G06T17/20

摘要： User interactive methods of determining vertex correspondence between boundaries or curves on objects to be merged is provided. One method relates to projecting a boundary of one object onto a second object to determine a merging curve, along which the two objects will be joined. Another method includes projecting a first object onto a plane to form a planar curve. The planar curve is then mapped to a second object to form a merging curve. Still another method includes interactively selecting corresponding key vertices on different objects to form a merging curve. A system presented that can use one or more of the methods of determining correspondence between boundaries. A merged object can be generated from the merging curve using a mesh solver, such as a Poisson or non-Poisson mesh solver.

摘要翻译： 提供了确定要合并的对象上的边界或曲线之间的顶点对应关系的用户交互方法。 一种方法涉及将一个对象的边界投影到第二对象上以确定两个对象将被连接在一起的合并曲线。 另一种方法包括将第一物体投射到平面上以形成平面曲线。 然后将平面曲线映射到第二个对象以形成合并曲线。 另一种方法包括在不同对象上交互地选择对应的关键顶点以形成合并曲线。 提出的系统可以使用确定边界之间的对应关系的一种或多种方法。 可以使用网格求解器（例如泊松或非泊松网格求解器）从合并曲线生成合并对象。

公开(公告)号：US20090022414A1

公开(公告)日：2009-01-22

申请号：US11781227

申请日：2007-07-20

申请人： Li-Yi Wei ,  Kun Zhou ,  Baining Guo ,  Heung-Yeung Shum ,  Lvdi Wang

发明人： Li-Yi Wei ,  Kun Zhou ,  Baining Guo ,  Heung-Yeung Shum ,  Lvdi Wang

IPC分类号： G06K9/40

CPC分类号： G06T5/008

摘要： An apparatus and method provide for providing an output image from an input image. The input image may contain at least one portion that does not display certain desired information of the image, such as texture information. The desired information may be obtained from a second portion of the input image and applied to the at least one portion that does not contain the texture information or contains a diminished amount of the texture information. Also, at least one characteristic of the second portion of the input image may not be applied to the at least one portion such as illumination information. In another example, the input image may be decomposed into multiple parts such as a high frequency and a low frequency component. Each component may be hallucinated individually or independently and combined to form the output image.

摘要翻译： 一种设备和方法提供从输入图像提供输出图像。 输入图像可以包含不显示图像的某些所需信息的至少一个部分，例如纹理信息。 可以从输入图像的第二部分获得期望的信息，并将其应用于不包含纹理信息的至少一个部分或包含纹理信息的减少量。 此外，输入图像的第二部分的至少一个特征可以不被应用于诸如照明信息的至少一个部分。 在另一示例中，输入图像可以被分解成多个部分，例如高频和低频分量。 每个组件可以单独地或独立地幻影，并组合以形成输出图像。

公开(公告)号：US20080143719A1

公开(公告)日：2008-06-19

申请号：US11612394

申请日：2006-12-18

申请人： Kun Zhou ,  Jiaping Wang ,  Stephen Lin ,  Baining Guo

发明人： Kun Zhou ,  Jiaping Wang ,  Stephen Lin ,  Baining Guo

IPC分类号： G06T15/50

CPC分类号： G06T15/55

摘要： A method, device and system is provided for providing global illumination of a scene. For example, global illumination may be provided in a rendered 3-dimensional image that may contain objects and/or light sources. Radiance functions or visibility functions may further be represented by scaling of spherical harmonics functions in the spherical harmonics domain. For example, scaling of spherical harmonics coefficients corresponding to a spherical function may be performed based on a spherical harmonics scaling transformation matrix based on an angular scaling function.

摘要翻译： 提供了一种用于提供场景的全局照明的方法，装置和系统。 例如，可以在可以包含对象和/或光源的渲染的三维图像中提供全局照明。 亮度函数或可见度函数可以进一步通过球面谐波域中的球谐函数的缩放来表示。 例如，可以基于基于角度缩放函数的球面谐波缩放变换矩阵来执行对应于球面函数的球谐函数的缩放。

公开(公告)号：US20080143711A1

公开(公告)日：2008-06-19

申请号：US11612391

申请日：2006-12-18

申请人： Kun Zhou ,  Weiwei Xu ,  Baining Guo

发明人： Kun Zhou ,  Weiwei Xu ,  Baining Guo

IPC分类号： G06T17/00

CPC分类号： G06T3/0093 ,  G06T13/80

摘要： A method and system is provided for deforming a shape of an image. In one example, an input is received for deforming a displayed shape, the shape including a boundary polygon or outline contour and a local area within the outline contour. The local area may further include vertices and edges. During deformation, an energy function corresponding to the outline contour and the local area may be determined and reduced or minimized. Positioning of the vertices and lengths of the edges may be determined based on the energy function or preservation of coordinates associated with the outline contour and the local area.

摘要翻译： 提供了用于使图像的形状变形的方法和系统。 在一个示例中，接收用于使所显示的形状变形的输入，该形状包括轮廓轮廓内的边界多边形或轮廓轮廓和局部区域。 局部区域还可以包括顶点和边缘。 在变形期间，可以确定和减小或减小对应于轮廓轮廓和局部区域的能量函数。 可以基于能量函数或与轮廓轮廓和局部区域相关联的坐标的保持来确定边缘的顶点和长度的定位。

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。

公开(公告)号：US20060279570A1

公开(公告)日：2006-12-14

申请号：US11147921

申请日：2005-06-08

申请人： Kun Zhou ,  Yaohua Hu ,  Stephen Lin ,  Baining Guo ,  Heung-Yeung Shum

发明人： Kun Zhou ,  Yaohua Hu ,  Stephen Lin ,  Baining Guo ,  Heung-Yeung Shum

IPC分类号： G06T15/50

CPC分类号： G06T15/60

摘要： Pre-computed shadow fields are described. In one aspect, shadow fields for multiple entities are pre-computed. The shadow fields are pre-computed independent of scene configuration. The multiple entities include at least one occluding object and at least one light source. A pre-computed shadow field for a light source indicates radiance from the light source. A pre-computed shadow field for an occluding object indicates occlusion of radiance from the at least one light source.

公开(公告)号：US20060028466A1

公开(公告)日：2006-02-09

申请号：US10911394

申请日：2004-08-04

申请人： Kun Zhou ,  Baining Guo ,  Heung-Yeung Shum

发明人： Kun Zhou ,  Baining Guo ,  Heung-Yeung Shum

IPC分类号： G06T17/00 ,  G09G5/00

CPC分类号： G06T17/205 ,  G06T17/20

摘要： User interactive methods of determining vertex correspondence between boundaries or curves on objects to be merged is provided. One method relates to projecting a boundary of one object onto a second object to determine a merging curve, along which the two objects will be joined. Another method includes projecting a first object onto a plane to form a planar curve. The planar curve is then mapped to a second object to form a merging curve. Still another method includes interactively selecting corresponding key vertices on different objects to form a merging curve. A system presented that can use one or more of the methods of determining correspondence between boundaries. A merged object can be generated from the merging curve using a mesh solver, such as a Poisson or non-Poisson mesh solver.

公开(公告)号：US20050093875A1

公开(公告)日：2005-05-05

申请号：US10698792

申请日：2003-10-31

申请人： Jingdan Zhang ,  Kun Zhou ,  Baining Guo ,  Heung-Yeung Shum

发明人： Jingdan Zhang ,  Kun Zhou ,  Baining Guo ,  Heung-Yeung Shum

IPC分类号： G06T11/00 ,  G09G5/00

CPC分类号： G06T11/001

摘要： Methods for synthesizing progressively-variant textures based on texton masks are provided. A first method creates a synthesized texture image guided by a sample texture, first texton mask corresponding to the sample texture and a second texton mask modified based on the first texton mask. A second method also creates a synthesized texture image guided by a first and second sample textures and corresponding first and second texton masks. A method for rendering a synthesized texture on an image of a three-dimensional object includes creating a synthesized texture on the object guided by a two-dimensional progressively-variant sample texture, a texton mask for the sample texture and a mesh of a plurality of vertices representing the object.

摘要翻译： 提供了基于纹理掩码合成渐变变体纹理的方法。 第一种方法创建由样本纹理引导的合成纹理图像，对应于样本纹理的第一纹理掩模和基于第一纹理掩模修改的第二纹理蒙版。 第二种方法还创建由第一和第二样本纹理和对应的第一和第二纹理蒙版引导的合成纹理图像。 用于在三维物体的图像上呈现合成纹理的方法包括在由二维渐变样本纹理引导的对象上创建合成纹理，用于样本纹理的纹理掩模和多个 表示对象的顶点。

公开(公告)号：US09404987B2

公开(公告)日：2016-08-02

申请号：US13872292

申请日：2013-04-29

申请人： Kun Zhou

发明人： Kun Zhou

IPC分类号： G01R33/565 ,  G01R33/563

CPC分类号： G01R33/56572 ,  G01R33/56341 ,  G01R33/56518

摘要： In a method for an apparatus correcting image distortion in diffusion-weighted echo-planar magnetic resonance imaging, a marker sequence is applied before a diffusion-weighted echo planar imaging sequence, to form a combined sequence. The combined sequence is used to obtain marked images with different preset b values and different preset diffusion directions. The diffusion-weighted echo planar imaging sequence is used to obtain diffusion-weighted echo planar images with the same b values and diffusion directions as the marked images. A stretching coefficient and a displacement coefficient are calculated for each image data column of the diffusion-weighted echo planar image. The stretching coefficient and displacement coefficient are used to correct the diffusion-weighted echo planar images.

摘要翻译： 在扩散加权回波平面磁共振成像中校正图像失真的装置的方法中，在扩散加权回波平面成像序列之前应用标记序列，以形成组合序列。 组合序列用于获得具有不同预设b值和不同预设扩散方向的标记图像。 扩散加权回波平面成像序列用于获得具有与标记图像相同的b值和扩散方向的扩散加权回波平面图像。 对扩散加权回波平面图像的每个图像数据列计算拉伸系数和位移系数。 拉伸系数和位移系数用于校正扩散加权回波平面图像。