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    • 3. 发明申请
    • METHOD AND APPARATUS FOR ENCODING 3D MESH MODELS, AND METHOD AND APPARATUS FOR DECODING ENCODED 3D MESH MODELS
    • 用于编码3D网格模型的方法和装置,以及用于解码编码的3D网格模型的方法和装置
    • WO2010089380A1
    • 2010-08-12
    • PCT/EP2010/051443
    • 2010-02-05
    • THOMSON LICENSINGCHEN, QuqingCAI, KangyingTENG, Jun
    • CHEN, QuqingCAI, KangyingTENG, Jun
    • G06T9/00H04N7/26H04N7/32H04N7/34
    • G06T9/001G06T9/004
    • 3D mesh models are widely used in various applications for representing 3D objects. These models are made of vertices and corresponding triangles, which can be compressed based on prediction and residuals. The present invention improves the accuracy of parallelogram prediction, particularly near sharp features. The proposed 3D mesh model encoding comprises analyzing the spatial or dihedral angles between triangles, clustering triangles with similar or equal dihedral angles, and defining a representative dihedral angle for each cluster. Triangles of each cluster are then encoded relative to individual prediction triangles having the representative dihedral angle according to the cluster. Additionally, the prediction triangle may be mirrored. An indication of the encoding mode is inserted into each vertex of the encoded bitstream. A decoder extracts the encoding mode indication, reconstructs the individual prediction triangles based on the respective representative dihedral angles and performs triangle prediction and reconstruction.
    • 3D网格模型广泛用于表示3D对象的各种应用中。 这些模型由顶点和相应的三角形组成,可以根据预测和残差进行压缩。 本发明提高了平行四边形预测的精度,特别是在尖锐特征附近。 所提出的3D网格模型编码包括分析三角形之间的空间或二面角,具有相似或相等二面角的聚类三角形,并为每个簇定义代表性的二面角。 然后,相对于根据簇的具有代表性的二面角的各个预测三角形对每个簇的三角形进行编码。 另外,预测三角形可以被镜像。 将编码模式的指示插入编码比特流的每个顶点。 解码器提取编码模式指示,基于相应的代表性二面角重建各个预测三角形,并执行三角形预测和重构。
    • 5. 发明申请
    • VIDEO CODING WITH CODING OF THE LOCATIONS OF SIGNIFICANT COEFFICIENTS IN A BLOCK OF COEFFICIENTS
    • 编码系统中重要系数位置的视频编码
    • WO2010018138A1
    • 2010-02-18
    • PCT/EP2009/060284
    • 2009-08-07
    • THOMSON LICENSINGAN, JichengCHEN, QuqingCHEN, ZhiboTENG, Jun
    • AN, JichengCHEN, QuqingCHEN, ZhiboTENG, Jun
    • H04N7/26H04N7/50
    • H04N19/176H04N19/103H04N19/149H04N19/15H04N19/18H04N19/194H04N19/91H04N19/93
    • In known image compression, following quantisation, a very sparse distribution of significant (i.e. non-zero) amplitude coefficients of the transformed image signal may be obtained while most quantised coefficients are zeros. A costly task for a transform-based image compression in terms of resulting overall data rate is to record the locations of such significant coefficients within the coding blocks. In quartation processing, a 'significant square' (containing at least one non-zero amplitude coefficient in the coefficient block) is recursively divided into four smaller squares until single significant coefficients are reached, and the significance statuses of all generated squares are encoded. However, for some distribution patterns encoding the x-y-coordinates of the significant coefficients as binary numbers will lead to less coding cost. According to the invention, at least four different pattern determination or encoding modes are checked, and the encoding side selects the least costly one of these modes and transfers the corresponding mode information to the decoding side for corresponding decoding.
    • 在已知的图像压缩中,在量化之后,可以获得变换图像信号的显着(即非零)振幅系数的非常稀疏的分布,而大多数量化的系数是零。 在所得到的总体数据速率方面,用于基于变换的图像压缩的昂贵任务是记录这些重要系数在编码块内的位置。 在四次分组处理中,将“显着平方”(包含系数块中的至少一个非零幅度系数)递归地划分为四个较小的正方形,直到达到单个有效系数,并且编码所有生成的正方形的显着状态。 然而,对于将有效系数的x-y坐标编码为二进制数的一些分布模式将导致较少的编码成本。 根据本发明,检查至少四种不同的图案确定或编码模式,并且编码方选择这些模式中最便宜的一种模式,并将相应的模式信息传送到解码端用于相应的解码。
    • 7. 发明申请
    • METHOD FOR ENCODING/DECODING A 3D MESH MODEL THAT COMPRISES ONE OR MORE COMPONENTS
    • 用于编码/解码包含一个或多个组件的3D网格模型的方法
    • WO2010142743A2
    • 2010-12-16
    • PCT/EP2010/058111
    • 2010-06-09
    • THOMSON LICENSINGCAI, KangyingCHEN, Qu QinTENG, Jun
    • CAI, KangyingCHEN, Qu QinTENG, Jun
    • G06T9/00
    • G06T9/001G06T9/004
    • 3D mesh models are represented by three types of data: connectivity data, geometry data and property data. The surface of a 3D object is a triangle mesh. 3D meshes contain huge amounts of data that need to be compressed efficiently. Additionally to the common world coordinate system (WCS) for the complete model and local coordinate system (LCS) for a single triangle, an individual component coordinate system (CCS) for each connected component is used. The component coordinate system (CCS) is used to normalize (53) the orientation of the respective component for quantization and de- quantization. This improves the accuracy of encoded 3D mesh models after quantization/de-quantization, particularly if a 3D mesh model comprises one or more distinct components.
    • 3D网格模型由三种类型的数据表示:连接数据,几何数据和属性数据。 3D对象的表面是三角形网格。 3D网格包含大量需要高效压缩的数据。 除了用于单个三角形的完整模型和局部坐标系(LCS)的共同世界坐标系(WCS)之外,还使用每个连接分量的单个分量坐标系(CCS)。 分量坐标系(CCS)用于归一化(53)用于量化和解量化的各个分量的取向。 这提高了量化/去量化之后的编码3D网格模型的精度,特别是如果3D网格模型包括一个或多个不同的分量。
    • 9. 发明申请
    • METHOD AND DEVICE FOR ENCODING AN INPUT BIT SEQUENCE AND CORRESPONDING DECODING METHOD AND DEVICE
    • 用于编码输入位序列和对应解码方法和设备的方法和设备
    • WO2010115790A1
    • 2010-10-14
    • PCT/EP2010/054259
    • 2010-03-30
    • THOMSON LICENSINGCHEN, QuqingCAI, KangyingCHEN, ZhiboTENG, Jun
    • CHEN, QuqingCAI, KangyingCHEN, ZhiboTENG, Jun
    • H03M5/14
    • H03M5/14H03M7/30
    • The invention is made in the technical field of encoding and decoding of bit sequences. The invention proposes a device for compression-encoding an input bit sequence (IBS) in which Zeroes and Ones occur equally frequent, comprising an XOR gate (XOR) adapted for receiving pairs of immediately succeeding bits of the input bit sequence (IBS) as inputs and for outputting further bits of an other bit sequence (OBS), means for adding a bit to said other bit sequence (OBS) wherein the added bit is a primary bit which is equal to a primary bit of the input bit sequence (IBS) or a last bit which is equal to a last bit of the input bit sequence (IBS), and means for encoding the other sequence. The XOR gate (XOR) transforms the input bit sequence (IBS) into the other bit sequence (OBS) which comprises more uneven frequencies of occurrence of Zeroes and Ones than the input bit sequence (IBS).
    • 本发明是在比特序列的编码和解码的技术领域中进行的。 本发明提出了一种用于压缩编码其中零和等于频繁出现的输入比特序列(IBS)的装置,包括适于将输入比特序列(IBS)的紧随其后的比特对作为输入的XOR门(XOR) 并且为了输出其他比特序列(OBS)的其他比特,用于将比特加到所述另一比特序列(OBS)的装置,其中所述相加比特是等于所述输入比特序列(IBS)的主比特的主比特, 或等于输入比特序列(IBS)的最后一位的最后一位,以及用于对其他序列进行编码的装置。 异或门(XOR)将输入比特序列(IBS)转换为比输入比特序列(IBS)更多的不均匀出现零和零的频率的比特序列(OBS)。