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1. 发明授权

US09094658B2 Method and apparatus of adaptive loop filtering 有权
标题翻译：自适应环路滤波的方法和装置
公开(公告)号：US09094658B2
公开(公告)日：2015-07-28
申请号：US13093068
申请日：2011-04-25
申请人： Chih-Ming Fu , Ching-Yeh Chen , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
发明人： Chih-Ming Fu , Ching-Yeh Chen , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
IPC分类号： H04N19/10 , H04N19/86 , H04N19/159 , H04N19/176 , H04N19/196 , H04N19/134 , H04N19/96 , H04N19/117 , H04N19/463 , H04N19/14 , H04N19/137 , H04N19/186 , H04N19/154 , H04N19/174 , H04N19/82 , H04N19/42
CPC分类号： H04N19/117 , H04N19/10 , H04N19/115 , H04N19/129 , H04N19/134 , H04N19/137 , H04N19/14 , H04N19/154 , H04N19/157 , H04N19/159 , H04N19/174 , H04N19/176 , H04N19/186 , H04N19/196 , H04N19/439 , H04N19/463 , H04N19/82 , H04N19/86 , H04N19/96
摘要： In a block-based motion compensated system, coding noises may arise due to lossy operations such as quantization. Deblocking is often used to alleviate visibility of coding artifacts by applying filtering across block boundaries adaptively. In the recent HEVC development, adaptive loop filtering (ALF) is being adopted to process deblocked reconstruction frames. Adaptive loop filtering is applied to reconstructed video data across multiple frames to reduce visibility of coding artifacts in the temporal domain. In a HEVC system, conventional ALF can be selectively turned ON or OFF for each block in a frame or a slice. The advanced ALF disclosed here allows a choice of multiple filter sets that can be applied to the reconstructed video data adaptively. Furthermore, the advanced ALF adopts a new unit for the filtering process to apply so that more flexible and/or localized processing can be provided. Furthermore, the advanced ALF allows a decoder to derive respective information for applying the filtering process without side information.
摘要翻译：在基于块的运动补偿系统中，由于诸如量化的有损操作，可能会产生编码噪声。解块通常用于通过自适应地跨越块边界应用过滤来减轻编码伪像的可视性。在最近的HEVC开发中，正在采用自适应环路滤波（ALF）来处理解块重建帧。自适应环路滤波被应用于跨多帧的重建视频数据，以减少时域中编码伪像的可见性。在HEVC系统中，对于帧或片中的每个块，可以选择性地将常规ALF打开或关闭。这里公开的高级ALF允许选择可以自适应地应用于重建的视频数据的多个滤波器组。此外，先进的ALF采用新的过滤单元进行应用，从而可以提供更灵活和/或本地化的处理。此外，高级ALF允许解码器导出用于应用无侧信息的过滤处理的相应信息。

2. 发明申请

US20130322523A1 METHOD AND APPARATUS FOR REDUCTION OF IN-LOOP FILTER BUFFER 审中-公开
标题翻译：减少内循环滤波器缓冲器的方法和装置
公开(公告)号：US20130322523A1
公开(公告)日：2013-12-05
申请号：US13985564
申请日：2012-04-19
申请人： Yu-Wen Huang , Chia-Yang Tsai , Ching-Yeh Chen , Chih-Ming Fu , Shaw-Min Lei
发明人： Yu-Wen Huang , Chia-Yang Tsai , Ching-Yeh Chen , Chih-Ming Fu , Shaw-Min Lei
IPC分类号： H04N7/26
CPC分类号： H04N19/46 , H04N19/117 , H04N19/132 , H04N19/134 , H04N19/182 , H04N19/423 , H04N19/80 , H04N19/82 , H04N19/86
摘要： A method and apparatus for in-loop processing of reconstructed video are disclosed. The method and apparatus configure the in-loop processing so that the processing requires no pixel or reduced pixels from other side of a virtual boundary. When the in-loop processing of the to-be-processed pixel requires a pixel from the other side of the virtual boundary, the pixel from the other side of the virtual boundary is replaced by a replacement pixel. The in-loop processing can also be configured to skip the pixel when the processing requires a pixel from other side of the virtual boundary. The in-loop processing can also be configured to change ALF filter shape or filter size when the in-loop processing requires a pixel from other side of the virtual boundary. A filtered output can be combined linearly or nonlinearly with the to-be-processed pixel to generate a final filter output.
摘要翻译：公开了重建视频的环路处理方法和装置。该方法和装置配置环路内处理，使得处理不需要来自虚拟边界的另一侧的像素或缩小像素。当待处理像素的循环处理需要来自虚拟边界的另一侧的像素时，来自虚拟边界的另一侧的像素被替换像素替代。当处理需要来自虚拟边界的另一侧的像素时，也可以配置循环处理以跳过像素。当内循环处理需要来自虚拟边界的另一侧的像素时，也可以将循环处理配置为改变ALF滤波器形状或滤波器大小。经滤波的输出可以与要处理的像素线性或非线性组合以产生最终的滤波器输出。

3. 发明授权

US09161041B2 Apparatus and method of efficient sample adaptive offset 有权
标题翻译：高效采样自适应偏移的装置和方法
公开(公告)号：US09161041B2
公开(公告)日：2015-10-13
申请号：US13177424
申请日：2011-07-06
申请人： Chih-Ming Fu , Ching-Yeh Chen , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
发明人： Chih-Ming Fu , Ching-Yeh Chen , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
IPC分类号： H04N7/26 , H04N19/117 , H04N19/82 , H04N19/176 , H04N19/147 , H04N19/14 , H04N19/182 , H04N19/136 , H04N19/86 , H04N19/61 , H04N19/85
CPC分类号： H04N19/117 , H04N19/136 , H04N19/14 , H04N19/147 , H04N19/176 , H04N19/182 , H04N19/61 , H04N19/82 , H04N19/85 , H04N19/86
摘要： For sample adaptive offset, classification may be used to classify the pixels into multiple categories and pixels in each category are offset compensated using an offset value for the category. The classification may be based on values of the current pixel and its neighboring pixels before SAO compensation. Therefore, the SAO compensated pixel cannot be written back to the current pixel location until the category for all pixels are determined. An embodiment of the present invention stores the relation between the current pixel and said one or more neighboring pixels so that the SAO compensated current pixel can replace the current pixel without buffering the to-be-processed pixels for classification. The SAO process may be performed on a region by region basis to adapt to the local characteristics of the picture. Rate-distortion optimization (RDO) is often used to guide the mode decision, such as region splitting/region merging decision. Computations associated with the RDO process usually are very computational intensive. Accordingly, distortion reduction estimation is developed which can substantially reduce the required computation associated with RDO.
摘要翻译：对于样本自适应偏移，可以使用分类来将像素分类为多个类别，并且使用该类别的偏移值来对每个类别中的像素进行偏移补偿。分类可以基于SAO补偿之前的当前像素及其相邻像素的值。因此，在确定所有像素的类别之前，SAO补偿像素不能被写回到当前像素位置。本发明的实施例存储当前像素和所述一个或多个相邻像素之间的关系，使得SAO补偿的当前像素可以代替当前像素，而不缓冲待处理像素用于分类。可以在逐个区域的基础上执行SAO处理，以适应图像的局部特征。速率失真优化（RDO）经常用于指导模式决策，如区域分割/区域合并决策。与RDO过程相关的计算通常是非常计算密集型的。因此，开发了可以显着减少与RDO相关联的所需计算的失真减小估计。

4. 发明授权

US09001883B2 Method and apparatus for slice common information sharing 有权
标题翻译：切片共同信息共享的方法和装置
公开(公告)号：US09001883B2
公开(公告)日：2015-04-07
申请号：US13298294
申请日：2011-11-17
申请人： Chia-Yang Tsai , Chih-Wei Hsu , Yu-Wen Huang , Ching-Yeh Chen , Chih-Ming Fu , Shaw-Min Lei
发明人： Chia-Yang Tsai , Chih-Wei Hsu , Yu-Wen Huang , Ching-Yeh Chen , Chih-Ming Fu , Shaw-Min Lei
IPC分类号： H04N7/50 , H04N19/86 , H04N19/70 , H04N19/172 , H04N19/117 , H04N19/174 , H04N7/26 , H04N19/82
CPC分类号： H04N19/117 , H04N19/136 , H04N19/172 , H04N19/174 , H04N19/70 , H04N19/82 , H04N19/86
摘要： A method and apparatus for sharing information in a video coding system are disclosed. Embodiments according to the present invention use an information sharing flag to determine whether to share in-loop filter information in the picture level. The information sharing flag may be incorporated in the sequence level, the picture level or the slice level to indicate whether information sharing is enabled. Multiple information sharing flags may also be used to adaptively control information sharing. Furthermore, method and apparatus of using multiple Adaptation Parameter Sets (APSs) for information sharing of in-loop filters are disclosed. APS identifiers of in-loop filters may be incorporated in the slice header to allow each of the in-loop filters select respective filter information from the multiple APSs. A flag is incorporated in SPS to indicate whether multiple APS or single APS is used. Various exemplary syntax designs are disclosed to illustrate information sharing.
摘要翻译：公开了一种用于在视频编码系统中共享信息的方法和装置。根据本发明的实施例使用信息共享标志来确定是否在图像级别中共享环路滤波器信息。信息共享标志可以并入在序列级别，画面级或片级中，以指示是否启用信息共享。也可以使用多个信息共享标志来自适应地控制信息共享。此外，公开了使用多个适配参数集（APS）进行环路滤波器信息共享的方法和装置。环路滤波器的APS标识符可以并入片标头中，以允许每个环路滤波器从多个APS中选择相应的滤波器信息。 SPS中包含一个标志，以指示是否使用多个APS或单个APS。公开各种示例性语法设计来说明信息共享。

5. 发明申请

US20120294353A1 Apparatus and Method of Sample Adaptive Offset for Luma and Chroma Components 审中-公开
标题翻译：用于亮度和色度分量的样本自适应偏移的装置和方法
公开(公告)号：US20120294353A1
公开(公告)日：2012-11-22
申请号：US13311953
申请日：2011-12-06
申请人： Chih-Ming Fu , Ching-Yeh Chen , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
发明人： Chih-Ming Fu , Ching-Yeh Chen , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
IPC分类号： H04N7/12
CPC分类号： H04N19/82 , H04N19/117 , H04N19/132 , H04N19/157 , H04N19/176 , H04N19/186 , H04N19/196 , H04N19/463 , H04N19/70 , H04N19/96
摘要： A method and apparatus for processing reconstructed video using in-loop filter in a video coding system are disclosed. The method uses chroma in-loop filter indication to indicate whether chroma components are processed by in-loop filter when the luma in-loop filter indication indicates that in-loop filter processing is applied to the luma component. An additional flag may be used to indicate whether the in-loop filter processing is applied to an entire picture using same in-loop filter information or each block of the picture using individual in-loop filter information. Various embodiments according to the present invention to increase efficiency are disclosed, wherein various aspects of in-loop filter information are taken into consideration for efficient coding such as the property of quadtree-based partition, boundary conditions of a block, in-loop filter information sharing between luma and chroma components, indexing to a set of in-loop filter information, and prediction of in-loop filter information.
摘要翻译：公开了一种使用视频编码系统中的环路滤波器处理重构视频的方法和装置。该方法使用色度环路滤波器指示来指示当亮度环路滤波器指示表明将环路滤波处理应用于亮度分量时，是否通过环路滤波器处理色度分量。可以使用附加标志来指示使用相同的环路滤波器信息或使用各个循环过滤器信息的图像的每个块来将整个图像应用于环路滤波处理。公开了根据本发明的用于提高效率的各种实施例，其中考虑到环路滤波器信息的各个方面以进行有效的编码，例如基于四叉树的分区的属性，块的边界条件，环路滤波器信息在亮度和色度分量之间共享，索引到一组环路滤波器信息，以及对环路滤波器信息的预测。

6. 发明申请

US20120082244A1 Method and Apparatus of Region-Based Adaptive Loop Filtering 有权
标题翻译：基于区域的自适应环路滤波的方法和装置
公开(公告)号：US20120082244A1
公开(公告)日：2012-04-05
申请号：US13177343
申请日：2011-07-06
申请人： Ching-Yeh Chen , Chih-Ming Fu , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
发明人： Ching-Yeh Chen , Chih-Ming Fu , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
IPC分类号： H04N7/26
CPC分类号： H04N19/00103 , H04N19/117 , H04N19/127 , H04N19/147 , H04N19/17 , H04N19/82
摘要： In a block-based motion compensated system, coding noises may arise due to lossy operations. Adaptive loop filter (ALF) is a technique used to improve the quality. A pixel adaptive (PA) ALF method was developed that uses the Sum-modified Laplacian Measure (SLM) to classify pixels and applies a respective ALF filter to each pixel according to the SLM. While the PA ALF achieves better performance over a conventional single filter (SF) based ALF, the PA ALF causes higher complexity and consumes more power due to the high complexity and per-pixel filter switching. Accordingly region based ALF scheme is disclosed which allows adaptive filter selection on a region by region basis and does not require per-pixel filter switching. In one embodiment according to the present invention, a picture is divided into M×N regions. The region based ALF also allows region merging for the M×N regions to improve performance. In another aspect of the present invention, the optimal ALF design also takes into consideration of the system complexity by using rate-distortion-complexity optimization (RDCO). The RDCO technique is also applied to sample adaptive offset (SAO) design.
摘要翻译：在基于块的运动补偿系统中，由于有损操作可能会产生编码噪声。自适应环路滤波器（ALF）是一种用于提高质量的技术。开发了像素自适应（PA）ALF方法，其使用Sum-Modified Laplacian Measure（SLM）对像素进行分类，并根据SLM对每个像素应用相应的ALF滤波器。虽然PA ALF比传统的基于单滤波器（SF）的ALF具有更好的性能，但是由于高复杂性和每像素滤波器切换，PA ALF导致更高的复杂度并且消耗更多的功率。公开了基于区域的ALF方案，其允许在逐个区域的基础上进行自适应滤波器选择，并且不需要每像素滤波器切换。在根据本发明的一个实施例中，图片被分成M×N个区域。基于区域的ALF还允许区域合并M×N区域以提高性能。在本发明的另一方面，最佳ALF设计还通过使用速率 - 失真 - 复杂度优化（RDCO）来考虑系统的复杂性。 RDCO技术也适用于采样自适应偏移（SAO）设计。

7. 发明授权

US08861617B2 Method and apparatus of region-based adaptive loop filtering 有权
标题翻译：基于区域的自适应环路滤波的方法和装置
公开(公告)号：US08861617B2
公开(公告)日：2014-10-14
申请号：US13177343
申请日：2011-07-06
申请人： Ching-Yeh Chen , Chih-Ming Fu , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
发明人： Ching-Yeh Chen , Chih-Ming Fu , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
IPC分类号： H04N7/26 , H04N19/82 , H04N19/17 , H04N19/117 , H04N19/147 , H04N19/127
CPC分类号： H04N19/00103 , H04N19/117 , H04N19/127 , H04N19/147 , H04N19/17 , H04N19/82
摘要： In a block-based motion compensated system, coding noises may arise due to lossy operations. Adaptive loop filter (ALF) is a technique used to improve the quality. A pixel adaptive (PA) ALF method was developed that uses the Sum-modified Laplacian Measure (SLM) to classify pixels and applies a respective ALF filter to each pixel according to the SLM. While the PA ALF achieves better performance over a conventional single filter (SF) based ALF, the PA ALF causes higher complexity and consumes more power due to the high complexity and per-pixel filter switching. Accordingly region based ALF scheme is disclosed which allows adaptive filter selection on a region by region basis and does not require per-pixel filter switching. In one embodiment according to the present invention, a picture is divided into M×N regions. The region based ALF also allows region merging for the M×N regions to improve performance. In another aspect of the present invention, the optimal ALF design also takes into consideration of the system complexity by using rate-distortion-complexity optimization (RDCO). The RDCO technique is also applied to sample adaptive offset (SAO) design.
摘要翻译：在基于块的运动补偿系统中，由于有损操作可能会产生编码噪声。自适应环路滤波器（ALF）是一种用于提高质量的技术。开发了像素自适应（PA）ALF方法，其使用Sum-Modified Laplacian Measure（SLM）对像素进行分类，并根据SLM对每个像素应用相应的ALF滤波器。虽然PA ALF比传统的基于单滤波器（SF）的ALF具有更好的性能，但是由于高复杂性和每像素滤波器切换，PA ALF导致更高的复杂度并且消耗更多的功率。公开了基于区域的ALF方案，其允许在逐个区域的基础上进行自适应滤波器选择，并且不需要每像素滤波器切换。在根据本发明的一个实施例中，图片被分成M×N个区域。基于区域的ALF还允许区域合并M×N区域以提高性能。在本发明的另一方面，最佳ALF设计还通过使用速率 - 失真 - 复杂度优化（RDCO）来考虑系统的复杂性。 RDCO技术也适用于采样自适应偏移（SAO）设计。

8. 发明授权

US09872015B2 Method and apparatus for improved in-loop filtering 有权
公开(公告)号：US09872015B2
公开(公告)日：2018-01-16
申请号：US13992472
申请日：2012-04-20
申请人： Chih-Ming Fu , Ching-Yeh Chen , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
发明人： Chih-Ming Fu , Ching-Yeh Chen , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
IPC分类号： H04N7/12 , H04N11/02 , H04N11/04 , H04N19/117 , H04N19/70 , H04N19/177 , H04N19/463 , H04N19/82
CPC分类号： H04N19/169 , H04N19/117 , H04N19/177 , H04N19/463 , H04N19/70 , H04N19/82
摘要： Video decoding and encoding with in-loop processing of reconstructed video are disclosed. At the decoder side, a flag is received from the video bitstream and according to the flag, information associated with in-loop filter parameters is received either from a data payload in the video bitstream to be shared by two or more coding blocks or individual coding block data in the video bitstream. At the encoder side, information associated with the in-loop filter parameters is incorporated either in a data payload in a video bitstream to be shared by two or more coding blocks or interleaved with individual coding block data in the video bitstream according to a flag. The data payload in the video bitstream is in a picture level, Adaptation Parameter Set (APS), or a slice header.

9. 发明授权

US09813738B2 Method and apparatus of adaptive loop filtering 有权
公开(公告)号：US09813738B2
公开(公告)日：2017-11-07
申请号：US13216242
申请日：2011-08-24
申请人： Chia-Yang Tsai , Chih-Ming Fu , Ching-Yeh Chen , Yu-Wen Huang , Shaw-Min Lei
发明人： Chia-Yang Tsai , Chih-Ming Fu , Ching-Yeh Chen , Yu-Wen Huang , Shaw-Min Lei
IPC分类号： H04N19/82 , H04N19/42 , H04N19/80 , H04N19/147 , H04N19/176 , H04N19/17 , H04N19/182 , H04N19/119 , H04N19/117
CPC分类号： H04N19/82 , H04N19/117 , H04N19/119 , H04N19/147 , H04N19/17 , H04N19/176 , H04N19/182 , H04N19/439 , H04N19/80
摘要： A method and apparatus for processing in-loop reconstructed video using an in-loop filter is disclosed. In the recent HEVC development, adaptive loop filtering (ALF) is being adopted to process in-loop reconstruction video data, where ALF can be selectively turned ON or OFF for each block in a frame or a slice. An advanced ALF is disclosed later that allows a choice of multiple filter sets that can be applied to the reconstructed video data adaptively. In the present disclosure, pixels of the in-loop reconstructed video data are divided into a plurality of to-be-filtered regions, and an in-loop filter from a filter set is determined for each to-be-filtered region based on a rate-distortion optimization procedure. According to one embodiment of the present invention, computation of cost function associated with the rate-distortion optimization procedure is related to correlation values associated with original video data and the in-loop reconstructed video data. Furthermore, the correlation values can be shared by the multiple candidate filters during the rate-distortion optimization procedure for said each to-be-filtered region. In another embodiment, the correlation values can be shared by multiple candidate to-be-filtered regions of an area of the in-loop reconstructed video data during the rate-distortion optimization procedure for the area of the in-loop reconstructed video data.

10. 发明申请

US20130215959A1 Method of Filter-Unit Based In-Loop Filtering 有权
标题翻译：基于滤波单元的环路滤波方法
公开(公告)号：US20130215959A1
公开(公告)日：2013-08-22
申请号：US13825061
申请日：2011-12-31
申请人： Ching-Yeh Chen , Chih-Ming Fu , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
发明人： Ching-Yeh Chen , Chih-Ming Fu , Chia-Yang Tsai , Yu-Wen Huang , Shaw-Min Lei
IPC分类号： H04N7/26
CPC分类号： H04N19/103 , H04N19/117 , H04N19/46 , H04N19/70 , H04N19/82
摘要： Methods for filter-unit based in-loop filtering in a video decoder and encoder are disclosed. In one embodiment, filter parameters are selected from a filter parameter set for each filter based on a filter index. In another embodiment, the picture is partitioned into filter units according to filter unit size, which can be selected between a default size and other size. When other size is selected, the filter unit size may be conveyed using direct size information or ratio information. In another embodiment, a merge flag and a merge index are used to convey filter unit merge information. A method for filter-unit based in-loop filtering in a video encoder for color video is disclosed. In one embodiment, the method incorporates filter syntax in the video bitstream by interleaving the color-component filter syntax for the FUs.
摘要翻译：公开了一种视频解码器和编码器中基于滤波器单元的环路滤波方法。在一个实施例中，基于滤波器索引从针对每个滤波器的滤波器参数集中选择滤波器参数。在另一个实施例中，根据滤波器单元尺寸将图像划分为滤波器单元，其可以在默认尺寸和其它尺寸之间进行选择。当选择其他尺寸时，可以使用直接尺寸信息或比率信息来传送过滤器单元尺寸。在另一个实施例中，使用合并标志和合并索引来传送过滤器单元合并信息。公开了一种用于彩色视频的视频编码器中的基于滤波器单元的环路滤波的方法。在一个实施例中，该方法通过交织FU的颜色分量滤波器语法来在视频比特流中包含滤波器语法。

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