公开(公告)号：US07010047B2

公开(公告)日：2006-03-07

申请号：US10268773

申请日：2002-10-11

Applicant: Foued Ben Amara ,  James Au ,  Faouzi Kossentini

Inventor： Foued Ben Amara ,  James Au ,  Faouzi Kossentini

IPC: H04N7/12

CPC classification number: H04N19/198 ,  H04N19/117 ,  H04N19/136 ,  H04N19/14 ,  H04N19/172 ,  H04N19/174 ,  H04N19/176 ,  H04N19/51 ,  H04N19/61 ,  H04N19/80 ,  H04N19/86

Abstract: A pre-processing system and method is used to compensate for global brightness changes in consecutive video frames. The system and method uses a brightness change model to identify the global brightness changes and to discard the brightness in a source frame so that the brightness changes between consecutive reconstructed video frames is kept to a minimum. The Hough Transform is used as one example of the model to accumulate votes for different values of brightness change model parameters. Compensation for any detected brightness changes in the source frame is performed with filtering of the model parameters when necessary, to help avoid any artifacts in the compensated source frame. Different application sequences of the brightness change model allows for multiple levels of processing delays.

Abstract translation: 预处理系统和方法用于补偿连续视频帧中的全局亮度变化。 该系统和方法使用亮度变化模型来识别全局亮度变化并丢弃源帧中的亮度，使得连续重建视频帧之间的亮度变化保持最小。 霍夫变换被用作为不同亮度变化模型参数值累积投票的模型的一个例子。 通过在必要时过滤模型参数来执行源帧中任何检测到的亮度变化的补偿，以帮助避免补偿源帧中的任何伪影。 亮度变化模型的不同应用顺序允许多级处理延迟。

公开(公告)号：US20070201564A1

公开(公告)日：2007-08-30

申请号：US11654570

申请日：2007-01-18

Applicant: Anthony Joch ,  James Au ,  Yu-sheng Lin

Inventor： Anthony Joch ,  James Au ,  Yu-sheng Lin

IPC: H04B1/66

CPC classification number: H04N19/86 ,  H04N19/117 ,  H04N19/14 ,  H04N19/159 ,  H04N19/176

Abstract: A method of filtering to remove coding artifacts introduced at block edges in a block-based video coder, the method having the steps of: checking the content activity on every line of samples belonging to a boundary to be filtered and where content activity is based on a set of adaptively selected thresholds determined using Variable-Shift Table Indexing (VSTI); determining whether the filtering process will modify the sample values on that particular line based on said content activity; and selecting a filtering mode between at least two filtering modes to apply on a block boundary basis, implying that there would be no switching between the two primary modes on a line by line basis along a given block boundary. The two filtering modes include a default mode based on a non-recursive filter, and a strong filtering mode which features two strong filtering sub-modes and a new selection criterion that is one-sided with respect to the block boundary to determine which of the two strong filtering sub-modes to use. The two strong filtering sub-modes include a new 3-tap filter sub-mode and a 5-tap filter sub-mode that permits a more efficient implementation of the filter.

公开(公告)号：US07227901B2

公开(公告)日：2007-06-05

申请号：US10300849

申请日：2002-11-21

Applicant: Anthony Joch ,  James Au ,  Yu-sheng Brandon Lin

Inventor： Anthony Joch ,  James Au ,  Yu-sheng Brandon Lin

IPC: H04N7/18

CPC classification number: H04N19/86 ,  H04N19/117 ,  H04N19/14 ,  H04N19/159 ,  H04N19/176

Abstract: A method of filtering to remove coding artifacts introduced at block edges in a block-based video coder, the method having the steps of: checking the content activity on every line of samples belonging to a boundary to be filtered and where content activity is based on a set of adaptively selected thresholds determined using Variable-Shift Table Indexing (VSTI); determining whether the filtering process will modify the sample values on that particular line based on said content activity; and selecting a filtering mode between at least two filtering modes to apply on a block boundary basis, implying that there would be no switching between the two primary modes on a line by line basis along a given block boundary. The two filtering modes include a default mode based on a non-recursive filter, and a strong filtering mode which features two strong filtering sub-modes and a new selection criterion that is one-sided with respect to the block boundary to determine which of the two strong filtering sub-modes to use. The two strong filtering sub-modes include a new 3-tap filter sub-mode and a 5-tap filter sub-mode that permits a more efficient implementation of the filter.

Abstract translation: 一种过滤以消除在基于块的视频编码器中在块边缘处引入的编码伪像的方法，该方法具有以下步骤：检查属于要被滤波的边界的样本的每行上的内容活动，并且其中内容活动基于 使用变换表索引（VSTI）确定的一组自适应选择的阈值; 确定所述过滤过程是否将基于所述内容活动修改所述特定行上的样本值; 并且在至少两个滤波模式之间选择滤波模式以在块边界基础上应用，这意味着沿给定块边界逐行地在两个主模式之间不会有切换。 两种滤波模式包括基于非递归滤波器的默认模式，以及强滤波模式，其具有两个强滤波子模式和相对于块边界单侧的新选择标准，以确定哪个 两个强大的过滤子模式使用。 两个强滤波子模式包括新的3抽头滤波器子模式和5抽头滤波器子模式，允许更有效地实现滤波器。

公开(公告)号：US07173971B2

公开(公告)日：2007-02-06

申请号：US10299840

申请日：2002-11-20

Applicant: Foued Ben Amara ,  James Au ,  Ali Jerbi ,  Faouzi Kossentini

Inventor： Foued Ben Amara ,  James Au ,  Ali Jerbi ,  Faouzi Kossentini

IPC: H04B1/66

CPC classification number: H04N19/117 ,  H04N19/139 ,  H04N19/176 ,  H04N19/521

Abstract: A system and method is provided to avoid or otherwise reduce luminance and/or chrominance trailing artifacts in block-based hybrid video coders using multiple block sizes and shapes. The proposed trailing artifact avoidance approach has at its core three main components. The first component is a method to identify flat blocks in the source frame that are most susceptible to the appearance of trailing artifacts, and where flatness is determined according to several proposed criteria. The second component is a method to identify bad blocks, which refer to predicted blocks in motion estimation that correspond to flat blocks in the source frame and that contain trailing artifacts. The third component is a method to avoid trailing artifacts when they are detected within a bad block, and where the avoidance is achieved by employing one or more tools from among a proposed set of high fidelity coding tools and/or high performance motion estimation tools.

Abstract translation: 提供了一种系统和方法，以避免或以其他方式减少使用多个块大小和形状的基于块的混合视频编码器中的亮度和/或色度拖尾伪影。 所提出的拖尾假象避免方法在其核心的三个主要组成部分。 第一个组件是一种识别源框架中最容易出现拖尾伪影的平面块的方法，并且根据几个提出的标准来确定平坦度。 第二个组件是一种识别不良块的方法，它指的是运动估计中对应于源帧中的平坦块并包含尾随伪影的预测块。 第三组件是一种在坏块内检测到拖尾伪影的方法，并且通过在提出的一组高保真编码工具和/或高性能运动估计工具中采用一个或多个工具来实现避免。

公开(公告)号：US06876703B2

公开(公告)日：2005-04-05

申请号：US09842810

申请日：2001-04-27

Applicant: Ismaeil R. Ismaeil ,  Alen Docef ,  Faouzi Kossentini

Inventor： Ismaeil R. Ismaeil ,  Alen Docef ,  Faouzi Kossentini

IPC: H04N7/26 ,  H04N7/12

CPC classification number: H04N19/523 ,  H04N19/156 ,  H04N19/533 ,  H04N19/56

Abstract: A video coding method progressively refines a predicted motion vector to obtain an estimated motion vector. Subsequent steps are omitted if the estimated motion vector matches a current macroblock. Variable matching thresholds can permit dynamic adjustment of image quality and computational cost to optimize encoding performance for available computational resources. The method permits control of desired encoding speed and bit rate by adjusting encoding parameters. Video coders according to the invention may comprise a motion estimator, transform computer and coder each of which operates according to one or more parameters. A speed rate control and/or a bit rate control may adjust the parameters to maintain a desired encoding speed and output bit rate. A coder according to the invention may be implemented in software running on a general purpose computer. The method may be used in block-based video encoders including MPEG-2 and H.263 encoders.

Abstract translation: 视频编码方法逐渐优化预测运动矢量以获得估计运动矢量。 如果估计的运动矢量与当前宏块匹配，则忽略后续步骤。 可变匹配阈值可以允许动态调整图像质量和计算成本，以优化可用计算资源的编码性能。 该方法允许通过调整编码参数来控制所需的编码速度和比特率。 根据本发明的视频编码器可以包括运动估计器，变换计算机和编码器，每个编码器根据一个或多个参数进行操作。 速度控制和/或比特率控制可以调整参数以保持期望的编码速度和输出比特率。 根据本发明的编码器可以在通用计算机上运行的软件中实现。 该方法可以用于基于块的视频编码器，包括MPEG-2和H.263编码器。

公开(公告)号：US20060227869A1

公开(公告)日：2006-10-12

申请号：US11270668

申请日：2005-11-10

Applicant: Anthony Joch ,  James Au ,  Yu-sheng Lin

Inventor： Anthony Joch ,  James Au ,  Yu-sheng Lin

IPC: H04N11/04 ,  H04B1/66 ,  H04N7/12 ,  H04N11/02

CPC classification number: H04N19/86 ,  H04N19/117 ,  H04N19/14 ,  H04N19/159 ,  H04N19/176

Abstract: A method of filtering to remove coding artifacts introduced at block edges in a block-based video coder, the method having the steps of: checking the content activity on every line of samples belonging to a boundary to be filtered and where content activity is based on a set of adaptively selected thresholds determined using Variable-Shift Table Indexing (VSTI); determining whether the filtering process will modify the sample values on that particular line based on said content activity; and selecting a filtering mode between at least two filtering modes to apply on a block boundary basis, implying that there would be no switching between the two primary modes on a line by line basis along a given block boundary. The two filtering modes include a default mode based on a non-recursive filter, and a strong filtering mode which features two strong filtering sub-modes and a new selection criterion that is one-sided with respect to the block boundary to determine which of the two strong filtering sub-modes to use. The two strong filtering sub-modes include a new 3-tap filter sub-mode and a 5-tap filter sub-mode that permits a more efficient implementation of the filter.

公开(公告)号：US07050504B2

公开(公告)日：2006-05-23

申请号：US10310059

申请日：2002-12-05

Applicant: Anthony Joch ,  James Au ,  Yu-sheng Brandon Lin

Inventor： Anthony Joch ,  James Au ,  Yu-sheng Brandon Lin

IPC: H04N7/18

CPC classification number: H04N19/86 ,  H04N19/117 ,  H04N19/14 ,  H04N19/159 ,  H04N19/176

Abstract: A method of filtering to remove coding artifacts introduced at block edges in a block-based video coder, the method having the steps of: checking the content activity on every line of samples belonging to a boundary to be filtered and where content activity is based on a set of adaptively selected thresholds determined using Variable-Shift Table Indexing (VSTI); determining whether the filtering process will modify the sample values on that particular line based on said content activity, and selecting a filtering mode between at least two filtering modes to apply on a block boundary basis, implying that there would be no switching between the two primary modes on a line by line basis along a given block boundary. The two filtering modes include a default mode based on a non-recursive filter, and a strong filtering mode which features two strong filtering sub-modes and a new selection criterion that is one-sided with respect to the block boundary to determine which of the two strong filtering sub-modes to use. The two strong filtering sub-modes include a new 3-tap filter sub-mode and a 5-tap filter sub-mode that permits a more efficient implementation of the filter.

Abstract translation: 一种过滤以消除在基于块的视频编码器中在块边缘处引入的编码伪像的方法，该方法具有以下步骤：检查属于要被滤波的边界的样本的每行上的内容活动，并且其中内容活动基于 使用变换表索引（VSTI）确定的一组自适应选择的阈值; 确定所述过滤过程是否将基于所述内容活动修改所述特定行上的样本值，以及在至少两个过滤模式之间选择过滤模式以在块边界基础上应用，这意味着两个主要 沿着给定的块边界逐行的模式。 两种滤波模式包括基于非递归滤波器的默认模式，以及强滤波模式，其具有两个强滤波子模式和相对于块边界单侧的新选择标准，以确定哪个 两个强大的过滤子模式使用。 两个强滤波子模式包括新的3抽头滤波器子模式和5抽头滤波器子模式，允许更有效地实现滤波器。