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1. 发明申请

WO2013013298A1 METHOD AND SYSTEM FOR EFFICIENT VIDEO TRANSCODING USING CODING MODES, MOTION VECTORS AND RESIDUAL INFORMATION 审中-公开
标题翻译：使用编码模式，运动矢量和残留信息的高效视频转码的方法和系统
公开(公告)号：WO2013013298A1
公开(公告)日：2013-01-31
申请号：PCT/CA2012/000690
申请日：2012-07-23
申请人： ÉCOLE DE TECHNOLOGIE SUPÉRIEURE , METOEVI, Isabelle , COULOMBE, Stéphane
发明人： METOEVI, Isabelle , COULOMBE, Stéphane
IPC分类号： H04N7/26
CPC分类号： H04N19/521 , H04N19/107 , H04N19/109 , H04N19/132 , H04N19/139 , H04N19/14 , H04N19/147 , H04N19/159 , H04N19/176 , H04N19/40
摘要： An improved MPEG-4 to H.264 transcoding algorithm is provided, exploiting residual, coding mode and motion vector information from the MPEG-4 stream. The use of the relative sum of absolute residuals (RSAR) to classify macroblocks (MB) leads to small sets of coding modes (CM) to test, and significantly reduces the computational complexity. In addition, RSAR is used to conditionally refine motion vectors (MV); only those MVs most likely to lead to quality improvements are refined. The average RSAR statistics are obtained from the transcoding of the previous Inter frame to provide adaptive thresholds for coding mode selection as well as conditional MV refinement. A corresponding video transcoder system is also provided.
摘要翻译：提供了改进的MPEG-4至H.264代码转换算法，利用来自MPEG-4流的残差，编码模式和运动矢量信息。使用绝对残差相对和（RSAR）对宏块进行分类（MB）导致了一小组编码模式（CM）进行测试，并显着降低了计算复杂度。此外，RSAR用于有条件地细化运动矢量（MV）; 只有那些最有可能导致质量改进的MV得到改进。平均RSAR统计量是从先前帧间转码获得的，以提供用于编码模式选择和条件MV细化的自适应阈值。还提供了相应的视频转码器系统。

2. 发明申请

WO2012149645A1 METHOD AND SYSTEM FOR INCREASING ROBUSTNESS OF VISUAL QUALITY METRICS USING SPATIAL SHIFTING 审中-公开
标题翻译：使用空间移位增加视觉质量度量的鲁棒性的方法和系统
公开(公告)号：WO2012149645A1
公开(公告)日：2012-11-08
申请号：PCT/CA2012/000422
申请日：2012-05-04
申请人： ÉCOLE DE TECHNOLOGIE SUPÉRIEURE , COULOMBE, Stéphane , REZAZADEH, Soroosh
发明人： COULOMBE, Stéphane , REZAZADEH, Soroosh
IPC分类号： G06T7/00 , G06T5/00 , G06T7/60
CPC分类号： G06T7/0002 , G06T2207/20064 , G06T2207/30168 , H04N19/85
摘要： A visual quality assessment method and system are based on deriving a quality metric by comparing sub-band approximations of a distorted image and an undistorted version of the same image, providing a good compromise between computational complexity and accuracy. The sub-band approximations are derived from Discrete Wavelet (Haar) transforms of small image blocks of each image. Due to inherent symmetries, the wavelet transform is "blind" to certain types of distortions. But the accuracy of the method is enhanced, and the blindness of the transform is overcome, by computing quality metrics for the distorted image as well as computing quality metrics for a shifted version of the distorted image and combining the results.
摘要翻译：视觉质量评估方法和系统基于通过比较失真图像的子带近似和相同图像的未失真版本来导出质量度量，从而在计算复杂性和精度之间提供了良好的折中。子带近似来自每个图像的小图像块的离散小波（Haar）变换。由于固有的对称性，小波变换对于某些类型的失真是“盲”的。但是，通过计算失真图像的质量度量以及计算失真图像的偏移版本的质量度量并结合结果，可以提高方法的准确性，并克服变换的盲目性。

3. 发明申请

WO2010132976A1 METHOD AND SYSTEM FOR GENERATING BLOCK MODE CONVERSION TABLE FOR EFFICIENT VIDEO TRANSCODING 审中-公开
标题翻译：用于生成有效视频转换的块模式转换表的方法和系统
公开(公告)号：WO2010132976A1
公开(公告)日：2010-11-25
申请号：PCT/CA2009/001807
申请日：2009-12-10
申请人： ECOLE DE TECHNOLOGIE SUPERIEURE , METOEVI, Isabelle , COULOMBE, Stéphane
发明人： METOEVI, Isabelle , COULOMBE, Stéphane
IPC分类号： H04N7/01
CPC分类号： H04N19/00472 , H04N19/107 , H04N19/109 , H04N19/139 , H04N19/14 , H04N19/15 , H04N19/159 , H04N19/176 , H04N19/40 , H04N19/593 , H04N19/61
摘要： A method and system for generation of a block mode conversion table for use in online transcoding of a sequence of input images in a first format to a sequence of output images in a second format are described. The table is based on a sequence of training images and provides an effective mapping between the encoding block modes and respective candidate transcoding block modes used during the online transcoding. The method utilizes the encoding block mode, the motion vectors and the residual information extracted during the decoding of the training image to generate the block mode conversion table. A corresponding system is also provided.
摘要翻译：描述了用于生成用于以第一格式的输入图像序列在第二格式的输出图像序列的在线转码中使用的块模式转换表的方法和系统。该表基于一系列训练图像，并且提供编码块模式与在线转码期间使用的相应候选转码模式之间的有效映射。该方法利用编码块模式，在训练图像解码期间提取的运动矢量和残差信息来生成块模式转换表。还提供了相应的系统。

4. 发明申请

WO2020237377A1 METHODS AND SYSTEMS FOR BIT ERROR DETERMINATION AND CORRECTION 审中-公开
公开(公告)号：WO2020237377A1
公开(公告)日：2020-12-03
申请号：PCT/CA2020/050724
申请日：2020-05-27
申请人： ÉCOLE DE TECHNOLOGIE SUPÉRIEURE
发明人： BOUSSARD, Vivien , COULOMBE, Stéphane
IPC分类号： H04L1/22 , H04L1/24 , H04W28/04
摘要： A computer-implemented technique for correcting a data packet having a payload and cyclic redundancy check information provides a list of possible packet errors by algorithmic operations of forcing and cancelling bits at certain positions using a generator polynomial, while maintaining the equivalence relationship with the original syndrome, performed explicitly using arithmetic operations or implicitly using a table representative of such arithmetic operations. Correction can then be implemented using an error chosen from the list.

5. 发明申请

WO2016119048A1 METHOD AND APPARATUS FOR VIDEO INTERMODAL TRANSCODING 审中-公开
标题翻译：视频内部转换的方法和装置
公开(公告)号：WO2016119048A1
公开(公告)日：2016-08-04
申请号：PCT/CA2016/000027
申请日：2016-01-29
申请人： ÉCOLE DE TECHNOLOGIE SUPÉRIEURE
发明人： FRANCHE, Jean-Francois , COULOMBE, Stéphane
IPC分类号： H04N19/40 , H04N19/122 , H04N19/139 , H04N19/17 , H04N19/65
CPC分类号： H04N19/52 , H04N19/103 , H04N19/167 , H04N19/176 , H04N19/40 , H04N19/44 , H04N19/65 , H04N19/70
摘要： A video intermodal transcoder converts a compressed bitstream formulated according a type-1 compression scheme to a type-2 compressed bitstream formulated according to a type-2 compression scheme. The transcoder includes an augmented type-1 decoder, a transcoder kernel, and an augmented type-2 encoder. The transcoder kernel performs processes of creating motion- vector candidates and pre-computing prediction errors for each cell of a predefined image coding block and for each candidate motion vector for repetitive use in evaluating various image partitions. In an implementation where the type-1 compression scheme follows the H.264 standard and the type-2 compression scheme follows the HEVC standard, the transcoder exploits the flexibility of the coding-tree structure and other HEVC features to significantly reduce the bit rate of the compressed bit stream. The pre-computation of prediction errors significantly reduces the processing effort, hence increases the throughput of the transcoder.
摘要翻译：视频联运代码转换器将根据类型1压缩方案配置的压缩比特流转换为根据类型2压缩方案来制定的类型2的压缩比特流。代码转换器包括增强型1解码器，代码转换器内核和增强型2编码器。代码转换器核心执行为预定图像编码块的每个单元创建运动矢量候选和预计算预测误差的处理，以及针对每个候选运动矢量进行估计以重复使用以评估各种图像分区的处理。在类型1压缩方案遵循H.264标准并且类型2压缩方案遵循HEVC标准的实现中，代码转换器利用编码树结构和其他HEVC特征的灵活性来显着降低比特率压缩比特流。预测误差的预计算大大减少了处理工作量，从而增加了代码转换器的吞吐量。

6. 发明申请

WO2007073602A1 MULTI-USERS REAL-TIME TRANSCODING SYSTEM AND METHOD FOR MULTIMEDIA SESSIONS 审中-公开
标题翻译：多用户实时转播系统和多媒体会议方法
公开(公告)号：WO2007073602A1
公开(公告)日：2007-07-05
申请号：PCT/CA2006/002134
申请日：2006-12-27
申请人： VANTRIX CORPORATION , COULOMBE, Stéphane
发明人： COULOMBE, Stéphane
IPC分类号： H04Q7/28 , H04L29/04 , H04Q7/30
CPC分类号： H04L65/4061 , H04L65/1006 , H04L65/1016 , H04L65/103 , H04L65/104 , H04L65/1043 , H04L65/605 , H04W88/181
摘要： A method an system for establishing a multi-user communication session, having a session description, between terminals with incompatible media characteristics, in which users with terminals having incompatible media characteristics are invited to participate in the communication session. A transcoding session is set up for enabling transcoding between the incompatible media characteristics of the terminals based on information about the terminals of the users having accepted the invitation, this information comprising the media characteristics of the users' terminals. The session description is established according to the transcoding session and, during the communication session, media streams from the terminal of one user are transcoded according to the transcoding session and the transcoded media streams are transmitted according to the session description to the other users participating in the communication session, using the media characteristics of the terminals of those other users.
摘要翻译：一种用于在具有不兼容媒体特性的终端之间建立具有会话描述的多用户通信会话的系统的方法，其中具有不兼容媒体特性的终端的用户被邀请参与通信会话。建立代码转换会话，用于根据关于已经接受邀请的用户的终端的信息来实现终端的不兼容的媒体特性之间的代码转换，该信息包括用户终端的媒体特性。根据代码转换会话建立会话描述，并且在通信会话期间，根据代码转换会话对来自一个用户的终端的媒体流进行代码转换，并且根据会话描述将转码的媒体流发送给参与的其他用户通信会话，使用其他用户的终端的媒体特性。

7. 发明申请

WO2009055899A1 SYSTEM AND METHOD FOR QUALITY-AWARE SELECTION OF PARAMETERS IN TRANSCODING OF DIGITAL IMAGES 审中-公开
标题翻译：在数字图像转换中质量选择参数的系统和方法
公开(公告)号：WO2009055899A1
公开(公告)日：2009-05-07
申请号：PCT/CA2008/001305
申请日：2008-07-16
申请人： ECOLE DE TECHNOLOGIE SUPERIEURE , COULOMBE, Stéphane , PIGEON, Steven , FRANCHE, Jean-François
发明人： COULOMBE, Stéphane , PIGEON, Steven , FRANCHE, Jean-François
IPC分类号： G06T9/00 , G06T3/40 , G06T7/00 , H04N7/50
CPC分类号： H04N19/59 , G06T3/4092 , H04N19/124 , H04N19/136 , H04N19/147 , H04N19/149 , H04N19/15 , H04N19/172 , H04N19/192 , H04N19/196 , H04N19/40 , H04N19/48 , H04N19/60
摘要： Several quality-aware transcoding systems and methods are described, in which the impact of both quality factor (QF) and scaling parameter choices on the quality of transcoded images are considered in combination. A basic transcoding system is enhanced by the addition of a quality prediction look-up table, and a method of generating such a table is also shown.
摘要翻译：描述了几种质量感知转码系统和方法，其中考虑质量因子（QF）和缩放参数选择对转码图像质量的影响。通过添加质量预测查找表来增强基本代码转换系统，并且还示出了生成这样的表格的方法。

8. 发明申请

WO2008154742A1 A BUFFER-BASED RATE CONTROL EXPLOITING FRAME COMPLEXITY, BUFFER LEVEL AND POSITION OF INTRA FRAMES IN VIDEO CODING 审中-公开
标题翻译：基于缓冲器的速率控制在视频编码中实现框架的复杂性，缓冲层级和内部框架的位置
公开(公告)号：WO2008154742A1
公开(公告)日：2008-12-24
申请号：PCT/CA2008/001168
申请日：2008-06-19
申请人： VANTRIX CORPORATION , COULOMBE, Stéphane , LABONTE, Francis
发明人： COULOMBE, Stéphane , LABONTE, Francis
IPC分类号： H04N7/50 , H04N7/64
CPC分类号： H04N19/00163 , H04N19/115 , H04N19/124 , H04N19/14 , H04N19/142 , H04N19/15 , H04N19/152 , H04N19/172 , H04N19/61 , H04N19/86 , H04N19/87
摘要： A device and method of controlling bitrate in video coding of a sequence of frames including series of Inter frames separated by Intra frames, wherein the coded frames are validated in a video buffering device prior to transmission of the coded frames and wherein the method comprises: measuring frame complexity in the sequence of frames; for each Inter frame, calculating a target buffer level of the video buffering device in relation to a distance between the Inter frame and a next Intra frame; for each Inter frame, calculating a target frame size in relation to the distance between the Inter frame and the next Intra frame, the measured frame complexity, a current buffer level of the video buffering device and the calculated target buffer level of the video buffering device; and using the calculated target frame size to control bitrate in video coding of the sequence of frames.
摘要翻译：一种用于控制包括由帧间隔开的一系列帧间的帧序列的视频编码中的比特率的装置和方法，其中编码帧在传输编码帧之前在视频缓冲装置中被验证，并且其中该方法包括：帧序列中的帧复杂度; 对于每个帧间帧，计算视频缓冲设备的目标缓冲器级别相对于帧间帧和下一帧帧间的距离; 对于每个帧间帧，计算与帧间帧和下一帧之间的距离相关的目标帧大小，所测量的帧复杂度，视频缓冲装置的当前缓冲器电平和所计算的视频缓冲装置的目标缓冲器电平 ; 并且使用所计算的目标帧大小来控制帧序列的视频编码中的比特率。

9. 发明申请

WO2010091494A1 METHOD AND SYSTEM FOR DETERMINING STRUCTURAL SIMILARITY BETWEEN IMAGES 审中-公开
标题翻译：用于确定图像之间的结构相似性的方法和系统
公开(公告)号：WO2010091494A1
公开(公告)日：2010-08-19
申请号：PCT/CA2009/000971
申请日：2009-07-13
申请人： ECOLE DE TECHNOLOGIE SUPERIEURE , REZAZADEH, Soroosh , COULOMBE, Stéphane
发明人： REZAZADEH, Soroosh , COULOMBE, Stéphane
IPC分类号： G06T7/00 , G06T9/00
CPC分类号： G06K9/6215 , G06T7/0002 , G06T2207/20016 , G06T2207/20052 , G06T2207/20064 , G06T2207/30168
摘要： Method and system for low complexity assessment of quality of an image are presented. By performing multiresolution decomposition of images using, for example, a discrete wavelet transform, and determining a metric based on a structural similarity index or a structural similarity map, a structural similarity score, characterizing similarity between images with a high degree of accuracy, is produced. The processing time is much smaller in comparison to that required by other methods producing image quality metrics of comparable accuracy.
摘要翻译：介绍了低复杂度评估图像质量的方法和系统。通过使用例如离散小波变换来执行图像的多分辨率分解，并且基于结构相似性索引或结构相似图确定度量，产生具有高精度图像的表征相似度的结构相似度分数。与产生可比准确度的图像质量度量的其他方法所需的处理时间相比，处理时间要小得多。

10. 发明申请

WO2008070987A1 AN IMPROVED VIDEO RATE CONTROL FOR VIDEO CODING STANDARDS 审中-公开
标题翻译：改进视频编码标准的视频率控制
公开(公告)号：WO2008070987A1
公开(公告)日：2008-06-19
申请号：PCT/CA2007/002242
申请日：2007-12-11
申请人： VANTRIX CORPORATION , COULOMBE, Stéphane
发明人： COULOMBE, Stéphane
IPC分类号： H04N7/24 , H04N7/26 , H04N7/50
CPC分类号： H04N19/50 , H04N19/115 , H04N19/124 , H04N19/149 , H04N19/152 , H04N19/159 , H04N19/172 , H04N19/61
摘要： A method and device for improving rate controlling in video coding of sequences including a series of Inter frames separated by Intra frames, when a decoding delay is considered, comprise for each Inter frame of the series: computing a target frame size, computing a maximum buffer level related to a position of each Inter frame relative to a previous Intra frame and an upcoming Intra frame, and optimizing a transmission buffer level in response to the computed target frame size and the computed maximum buffer level.
摘要翻译：一种用于改进序列的视频编码中的速率控制的方法和装置，包括：当考虑解码延迟时，包括由帧内分离的一系列帧间的帧序列的每个帧间：计算目标帧大小，计算最大缓冲区与每个Inter帧相对于先前的帧内帧和即将到来的帧内帧的位置相关的级别，以及响应于所计算的目标帧大小和所计算的最大缓冲器级别来优化传输缓冲器级别。

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