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1. 发明授权

US09898834B2 Method and apparatus for generating a bitstream of repetitive structure discovery based 3D model compression 有权
公开(公告)号：US09898834B2
公开(公告)日：2018-02-20
申请号：US14356737
申请日：2011-11-25
申请人： Kangying Cai , Wenfei Jiang , Jiang Tian
发明人： Kangying Cai , Wenfei Jiang , Jiang Tian
IPC分类号： G06T9/00 , H04N19/70
CPC分类号： G06T9/001 , H04N19/70
摘要： A method and apparatus for generating a bitstream representative of a 3D model, and a method and an apparatus for processing the same. A 3D model is modeled by using a using a ‘pattern-instance’ representation, wherein a pattern is a representative geometry of a repetitive structure, and the connected components belonging to the repetitive structure is call an instance of the corresponding pattern. After discovery of the repetitive structures and their transformations and properties, the present embodiments provide for generating a bitstream in either a first format or a second format. In the first format, the pattern ID and its associated transformation and property information are grouped together in the bitstream, and in the second format the pattern ID, transformation property and property information are grouped together according to information type.

2. 发明申请

US20150373329A1 METHOD AND APPARATUS FOR VERTEX ERROR CORRECTION 有权
标题翻译：用于VERTEX错误校正的方法和装置
公开(公告)号：US20150373329A1
公开(公告)日：2015-12-24
申请号：US14655358
申请日：2013-06-18
申请人： Wenfei JIANG , Kangying CAI , Jiang TIAN
发明人： Wenfei JIANG , Kangying CAI , Jiang TIAN
IPC分类号： H04N19/126 , H04N19/94 , H04N19/597 , H04N19/46 , G06T9/00
CPC分类号： H04N19/126 , G06T9/001 , H04N19/154 , H04N19/46 , H04N19/597 , H04N19/90 , H04N19/94
摘要： A 3D model can be modeled using “pattern-instance” representation, wherein an instance component may be represented as transformation (for example, rotation, translation, and scaling) of a pattern. Quantization errors may be introduced when encoding rotation information, causing different vertex coordinate errors at different 5 vertices of an instance. To efficiently compensate the vertex coordinate errors, the encoder decides a quantization parameter for compensating a vertex coordinate error. The quantization parameter is signaled in the bitstream as a quantization index. The quantization index, a quantization table the indicates a mapping between quantization indices and quantization parameters, and vertex coordinate errors are 10 encoded into a bitstream. The quantization table may be built based on statistical data. At the decoder, the vertex coordinate error is decoded based on a quantization parameter, which is determined from a received quantization index.
摘要翻译：可以使用“模式 - 实例”表示来建模3D模型，其中实例组件可以被表示为模式的变换（例如，旋转，平移和缩放）。在编码旋转信息时可引入量化误差，导致在实例的不同5个顶点处产生不同的顶点坐标误差。为了有效地补偿顶点坐标误差，编码器决定用于补偿顶点坐标误差的量化参数。量化参数在比特流中作为量化索引被通知。量化指标，量化表表示量化索引和量化参数之间的映射以及顶点坐标误差被编码为比特流。量化表可以基于统计数据构建。在解码器中，基于从接收到的量化索引确定的量化参数来解码顶点坐标误差。

3. 发明授权

US09035807B2 Hierarchical entropy encoding and decoding 有权
标题翻译：分层熵编码和解码
公开(公告)号：US09035807B2
公开(公告)日：2015-05-19
申请号：US14240066
申请日：2011-08-25
申请人： Wenfei Jiang , Kangying Cai , Ping Hu
发明人： Wenfei Jiang , Kangying Cai , Ping Hu
IPC分类号： H03M5/00 , H03M7/00 , G06T17/00 , G06T9/00 , G06T9/40 , H04N19/96
CPC分类号： H03M7/00 , G06T9/001 , G06T9/40 , G06T17/005 , H04N19/96
摘要： A particular implementation receives geometry data of a 3D mesh, and represents the geometry data with an octree. The particular implementation partitions the octree into three parts, wherein the symbols corresponding to the middle part of the octree are hierarchical entropy encoded. To partition the octree into three parts, different thresholds are used. Depending on whether a symbol associated with a node is an S1 symbol, the child node of the node is included in the middle part or the upper part of the octree. In hierarchical entropy encoding, a non-S1 symbol is first encoded as a pre-determined symbol ‘X’ using symbol set S2={S1, ‘X’} and the non-S1 symbol itself is then encoded using symbol set S0 (S2⊂S0), and an S1 symbol is encoded using symbol set S2. Another implementation defines corresponding hierarchical entropy decoding. A further implementation reconstructs the octree and restores the geometry data of a 3D mesh from the octree representation.
摘要翻译：特定实现接收3D网格的几何数据，并且表示具有八叉树的几何数据。特定实现将八叉树分割成三部分，其中对应于八叉树的中间部分的符号是分层熵编码的。为了将八叉树分为三个部分，使用不同的阈值。根据与节点相关联的符号是否为S1符号，节点的子节点包含在八叉树的中间部分或上部。在分层熵编码中，首先使用符号集S2 = {S1，'X'）将非S1符号编码为预定符号“X”，然后使用符号集S0（S2 ⊂S0），并且使用符号集S2对S1符号进行编码。另一个实现定义了相应的分层熵解码。另一个实现重建八叉树，并从八叉树表示恢复3D网格的几何数据。

4. 发明申请

US20140320492A1 METHODS AND APPARATUS FOR REFLECTIVE SYMMETRY BASED 3D MODEL COMPRESSION 审中-公开
标题翻译：基于反射对称的3D模型压缩的方法和装置
公开(公告)号：US20140320492A1
公开(公告)日：2014-10-30
申请号：US14356668
申请日：2011-11-25
申请人： Wenfei Jiang , Kangying Cai , Tao Luo
发明人： Wenfei Jiang , Kangying Cai , Tao Luo
IPC分类号： G06T17/10 , G06T15/00
CPC分类号： G06T17/10 , G06T9/001 , G06T15/005 , G06T2219/2008
摘要： Encoders and decoders, and methods of encoding and decoding, are provided for rendering 3D images. The 3D images are decomposed by analyzing components of the 3D images to match reflections of patterns in the 3D images, and to restore the components for further rendering of the 3D image. The encoders and decoders utilize principles of reflective symmetry to effectively match symmetrical points in an image so that the symmetrical points can be characterized by a rotation and translation matrix, thereby reducing the requirement of coding and decoding all of the points in 3D image and increasing computational efficiency.
摘要翻译：编码器和解码器以及编码和解码方法被提供用于渲染3D图像。 3D图像通过分析3D图像的组件来分解，以匹配3D图像中图案的反射，并恢复组件以进一步渲染3D图像。编码器和解码器利用反射对称的原理来有效地匹配图像中的对称点，使得对称点可以通过旋转和平移矩阵来表征，从而减少对3D图像中的所有点的编码和解码的需求，并增加计算效率。

5. 发明申请

US20150009211A1 METHOD FOR SETTING AND DETERMINING DIRECTIONS OF PRINCIPAL AXES OF 3D OBJECT 审中-公开
标题翻译：用于设置和确定3D对象主轴方向的方法
公开(公告)号：US20150009211A1
公开(公告)日：2015-01-08
申请号：US14376156
申请日：2012-02-03
申请人： Wenfei Jiang , Kangying Cai , Tao Luo
发明人： Wenfei Jiang , Kangying Cai , Tao Luo
IPC分类号： G06T15/00
CPC分类号： G06T15/00 , G06T7/70 , G06T19/00
摘要： The invention provides a method for setting the directions of principal axes of a 3D object is provided. The method comprises: for each of any two principal axes, setting the direction of the principal axis according to at least one predefined function, with which the result calculated of the 3D object for the vertices in the positive half space of the principal axis is smaller than or equal to the result for the vertices in the negative half space of the principal axis, wherein a vertex in the positive half space of the principal axis means the one with a coordinate of the principal axis larger than 0, and a vertex in the negative half space of the principal axis means the one with a coordinate of the axis smaller than 0; setting the direction of the third principal axis of to follow the right-hand rule with said two principal axes, wherein the vector for the third axis is the cross product of the vectors for said two principal axes; and displaying a signal of the 3D object with the directions of the principal axes set according to the above steps.
摘要翻译：本发明提供了一种设置3D对象主轴方向的方法。该方法包括：对于任何两个主轴中的每一个，根据至少一个预定义的功能来设定主轴的方向，利用该预定义函数计算主轴的正半空间中顶点的3D对象的结果较小大于或等于主轴的负半空间中的顶点的结果，其中主轴的正半空间中的顶点是指主轴的坐标大于0的顶点，以及主轴的负半空间是指轴小于0的坐标轴; 将所述第三主轴的方向设置为与所述两个主轴遵循右手规则，其中所述第三轴的向量是所述两个主轴的向量的交叉乘积; 以及根据上述步骤，按照主轴的方向显示3D对象的信号。

6. 发明申请

US20140324914A1 POSITION CODING BASED ON SPATIAL TREE WITH DUPLICATE POINTS 审中-公开
标题翻译：基于具有双重点的空间树的位置编码
公开(公告)号：US20140324914A1
公开(公告)日：2014-10-30
申请号：US14356748
申请日：2011-11-25
申请人： Tao Luo , Wenfei Jiang , Kangying Cai
发明人： Tao Luo , Wenfei Jiang , Kangying Cai
IPC分类号： G06F17/30
摘要： A method and an apparatus for constructing a spatial tree data structure corresponding to a region. According to the present principles, a cell may include therein a point or a set of points that are determined to be duplicate points. In an embodiment the duplicate points are determined based on the size of the points included within the cell The inclusion of duplicate points within a particular cell, rather than further subdividing the cell, provides coding efficiency. The present principles are particularly advantageous in the context of quadtree or octree type partitioning, and may be used in 3D mesh coding.
摘要翻译：一种用于构建对应于区域的空间树数据结构的方法和装置。根据本原理，单元格可以包括确定为重复点的点或一组点。在一个实施例中，根据包含在小区内的点的大小来确定重复点。在特定小区内包括重复点，而不是进一步细分小区，提供编码效率。本原理在四叉树或八叉树类型分割的上下文中是特别有利的，并且可以用于3D网格编码。

7. 发明申请

US20130235047A1 METHOD FOR ANIMATING CHARACTERS, WITH COLLISION AVOIDANCE BASED ON TRACING INFORMATION 有权
标题翻译：基于跟踪信息的消除角色的方法
公开(公告)号：US20130235047A1
公开(公告)日：2013-09-12
申请号：US13988338
申请日：2011-11-28
申请人： Zhijin Xia , Jun Teng , Kangying Cai , Zhibo Chen
发明人： Zhijin Xia , Jun Teng , Kangying Cai , Zhibo Chen
IPC分类号： G06T13/80
CPC分类号： G06T13/80 , G06T13/40 , G06T2210/21
摘要： A method for determining a moving direction or moving velocity for a character in a group comprises reading tracing information from a cell in a terrain map on which the character is located, determining if collision avoidance is needed, and if a collision avoiding manoeuvre is necessary then updating the tracing information in the current terrain cell.
摘要翻译：用于确定组中的角色的移动方向或移动速度的方法包括从字符所在的地形图中的小区读取跟踪信息，确定是否需要避免碰撞，并且如果需要碰撞避免机动，则更新当前地形单元格中的跟踪信息。

8. 发明申请

US20130103365A1 METHOD AND APPARATUS FOR DETECTING REPETITIVE STRUCTURES IN 3D MESH MODELS 审中-公开
标题翻译：用于检测3D网格模型中重复结构的方法和装置
公开(公告)号：US20130103365A1
公开(公告)日：2013-04-25
申请号：US13807322
申请日：2010-06-30
申请人： Kangying Cai , Weiwei Li , Zhibo Chen
发明人： Kangying Cai , Weiwei Li , Zhibo Chen
IPC分类号： G06T19/00
CPC分类号： G06T19/00 , G06K9/00201 , G06K9/469 , G06K9/48 , G06K2209/29 , G06T17/10
摘要： Discovering repetitive structures in 3D models is a challenging task. A method for detecting repetitive structures in 3D models comprises sampling the 3D model using a current sampling step size, detecting repetitive structures and remaining potions of the model, determining a representative for each of the one or more repetitive structures, and as long as the detecting step yields one or more repetitive structures, reducing the current sampling step size and repeating the steps of sampling and detecting for each detected representative of a detected repetitive structure and for the remaining portions of the model, wherein the reduced sampling step size is used. The described method and device can e.g. be used for 3D model compression, 3D model repairing, or geometry synthesis.
摘要翻译：发现3D模型中的重复结构是一项具有挑战性的任务。用于检测3D模型中的重复结构的方法包括使用当前采样步长对模型进行采样，检测模型的重复结构和剩余部分，为每个一个或多个重复结构确定代表，并且只要检测步骤产生一个或多个重复结构，减少当前采样步长并重复对每个检测到的检测到的重复结构的代表进行采样和检测的步骤以及模型的剩余部分，其中使用减小的采样步长。所描述的方法和装置可以例如。用于3D模型压缩，3D模型修复或几何合成。

9. 发明授权

US10032309B2 Predictive position decoding 有权
公开(公告)号：US10032309B2
公开(公告)日：2018-07-24
申请号：US14356311
申请日：2011-11-07
申请人： Wenfei Jiang , Kangying Cai , Teng Ma
发明人： Wenfei Jiang , Kangying Cai , Teng Ma
IPC分类号： G06T17/20 , G06T9/00 , G06T9/40
摘要： A method and apparatus for position decoding of three dimensional mesh models are described including predicting a symbol probability of a non-empty-child-cell Cl,k, where Cl,k denotes the kth cell at layer l, wherein the symbol probability is estimated based on an accuracy of a fitted plane P, decoding the non-empty-child-cell responsive to the received predicted probability of the non-empty-child-cell, subdividing the non-empty-child-cell, if the non-empty-child-cell has more than one vertex, determining if there are more unprocessed non-empty-child-cells at layer l, determining if a lowest layer of non-empty-child-cells has been reached, if there are no more unprocessed non-empty-child-cells at layer l and regenerating the three dimensional mesh model, if the lowest layer of non-empty-child-cells has been reached.

10. 发明授权

US09621924B2 Vextex correction method and apparatus for rotated three-dimensional (3D) components 有权
公开(公告)号：US09621924B2
公开(公告)日：2017-04-11
申请号：US14390546
申请日：2012-04-18
申请人： Wenfei Jiang , Kangying Cai , Jiang Tian
发明人： Wenfei Jiang , Kangying Cai , Jiang Tian
IPC分类号： G06K9/46 , G06K9/36 , H04N19/62 , G06T9/00 , H04N19/124 , H04N19/44 , H04N19/91
CPC分类号： H04N19/62 , G06T9/001 , G06T9/004 , H04N19/124 , H04N19/44 , H04N19/91
摘要： A 3D model can be modeled using pattern-instance representation, wherein an instance component may be represented as transformation (for example, rotation, translation, and scaling) of a pattern. Quantization errors may be introduced when encoding rotation information, causing different vertex coordinate errors at different vertices of an instance. To efficiently compensate the vertex coordinate errors, an upper bound can be estimated for the vertex coordinate error of a vertex. Based on the upper bound, the codec decides whether the vertex coordinate error of the vertex needs to be compensated, and decides a quantization parameter for compensating the vertex coordinate error if compensation is needed. The upper bound can be estimated at both the encoder and decoder, and thus, no explicit signaling is needed to indicate whether vertex coordinate error compensation is used or to indicate the quantization parameter for the vertex coordinate error.

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