公开(公告)号：US08792564B2

公开(公告)日：2014-07-29

申请号：US12259649

申请日：2008-10-28

申请人： Jeongnam Youn ,  Yushin Cho ,  Daisuke Hiranaka

发明人： Jeongnam Youn ,  Yushin Cho ,  Daisuke Hiranaka

IPC分类号： H04N7/26

CPC分类号： H04N19/00066 ,  H04N19/117 ,  H04N19/14 ,  H04N19/176 ,  H04N19/30 ,  H04N19/61 ,  H04N19/85

摘要： A method and apparatus for preprocessing a video signal prior to its being encoded. During preprocessing, features are extracted from the video signal into feature planes which are each adaptively filtered in response to estimations of feature activity. After feature extraction the signal which remains is referred to as a “remaining signal”, which is then noise filtered to remove a substantial portion of the noise. The feature planes and remaining signal are recombined into a preprocessed output signal configured for receipt and processing by a video encoder. A video encoder receiving the preprocessed video signal can generate higher quality and/or lower bit rate encoded video than one receiving the original source video. Preprocessing according to the invention is particularly well suited for use with encoders adapted to remove temporal and/or spatial redundancy, such as those implemented according to the MPEG2/4, or AVC/H.264 standards.

摘要翻译： 一种用于在编码视频信号之前对视频信号进行预处理的方法和装置。 在预处理期间，将特征从视频信号提取到特征平面中，每个特征平面根据特征活动的估计被自适应过滤。 在特征提取之后，剩下的信号被称为“剩余信号”，然后对其进行噪声滤波以去除大部分噪声。 特征平面和剩余信号被重新组合成被配置为由视频编码器接收和处理的预处理输出信号。 接收预处理视频信号的视频编码器可以产生比接收原始源视频的视频编码视频更高质量和/或较低比特率编码视频。 根据本发明的预处理特别适用于适用于去除时间和/或空间冗余的编码器，例如根据MPEG2 / 4或AVC / H.264标准实现的冗余。

公开(公告)号：US08203619B2

公开(公告)日：2012-06-19

申请号：US12570976

申请日：2009-09-30

申请人： Yushin Cho ,  Daisuke Hiranaka ,  Jeongnam Youn

发明人： Yushin Cho ,  Daisuke Hiranaka ,  Jeongnam Youn

IPC分类号： H04N5/228 ,  H04N7/12 ,  H04N11/02 ,  H04N11/04

CPC分类号： H04N19/152 ,  H04N19/107 ,  H04N19/115 ,  H04N19/176 ,  H04N19/63

摘要： A method of deciding a target bit rate for wavelet-based image encoding based on the wavelet coefficients is described. The target bit rate is used for maintaining a high quality image. A minimum target bit rate and a maximum target bit rate are determined. A pseudo code length corresponding to the minimum target bit rate is calculated. The pseudo code length is calculated as a function of the wavelet coefficients. The corresponding pseudo code length is calculated for the maximum target bit rate. A curve between the pseudo code length and target bit rate is derived. Slope of the curve depends on buffer fullness. Using the curve, for a given pseudo code length, an appropriate target bit rate is derived. The derived target bit rate depends on the image content, and computing resources are able to be optimally used to attain similar quality for each image block of an image.

摘要翻译： 描述了基于小波系数确定基于小波的图像编码的目标比特率的方法。 目标比特率用于维持高质量的图像。 确定最小目标比特率和最大目标比特率。 计算与最小目标比特率对应的伪码长度。 根据小波系数计算伪码长度。 针对最大目标比特率计算相应的伪码长度。 导出伪码长度与目标比特率之间的曲线。 曲线的斜率取决于缓冲区充满度。 使用曲线，对于给定的伪代码长度，导出适当的目标比特率。 导出的目标比特率取决于图像内容，并且计算资源能够被最佳地用于为图像的每个图像块获得相似的质量。

公开(公告)号：US08154617B2

公开(公告)日：2012-04-10

申请号：US12571070

申请日：2009-09-30

申请人： Yushin Cho ,  Daisuke Hiranaka ,  Jeongnam Youn

发明人： Yushin Cho ,  Daisuke Hiranaka ,  Jeongnam Youn

IPC分类号： H04N5/228 ,  H04N7/12 ,  G06K9/36

CPC分类号： H04N17/004 ,  G06K9/4647 ,  H04N21/44008

摘要： A method of detecting existence of visually thin lines in images is described herein. The method includes profile generation, profile analysis and deciding the existence of thin lines. The profile generation includes generating a profile in each direction of the input image. Multiple projection lines are projected along the direction and all of the pixel values along the projection lines are added and averaged to obtain a profile. The profile analysis includes determining presence of thin lines in the input image and also noticing if the direction of the thin lines is similar to that of the projection lines. At the third step, according to the analysis made, existence of thin lines in the image is decided.

摘要翻译： 这里描述了检测图像中视线细线的存在的方法。 该方法包括轮廓生成，轮廓分析和确定细线的存在。 简档生成包括在输入图像的每个方向上生成简档。 多个投影线沿着该方向投影，并且沿着投影线的所有像素值被添加并平均以获得轮廓。 轮廓分析包括确定输入图像中的细线的存在，并且还注意细线的方向是否类似于投影线的方向。 在第三步，根据分析，确定图像中细线的存在。

公开(公告)号：US20110074976A1

公开(公告)日：2011-03-31

申请号：US12571070

申请日：2009-09-30

申请人： Yushin Cho ,  Daisuke Hiranaka ,  Jeongnam Youn

发明人： Yushin Cho ,  Daisuke Hiranaka ,  Jeongnam Youn

IPC分类号： H04N5/76 ,  G06K9/00

CPC分类号： H04N17/004 ,  G06K9/4647 ,  H04N21/44008

摘要： A method of detecting existence of visually thin lines in images is described herein. The method includes profile generation, profile analysis and deciding the existence of thin lines. The profile generation includes generating a profile in each direction of the input image. Multiple projection lines are projected along the direction and all of the pixel values along the projection lines are added and averaged to obtain a profile. The profile analysis includes determining presence of thin lines in the input image and also noticing if the direction of the thin lines is similar to that of the projection lines. At the third step, according to the analysis made, existence of thin lines in the image is decided.

摘要翻译： 这里描述了检测图像中视线细线的存在的方法。 该方法包括轮廓生成，轮廓分析和确定细线的存在。 简档生成包括在输入图像的每个方向上生成简档。 多个投影线沿着该方向投影，并且沿着投影线的所有像素值被添加并平均以获得轮廓。 轮廓分析包括确定输入图像中的细线的存在，并且还注意细线的方向是否类似于投影线的方向。 在第三步，根据分析，确定图像中细线的存在。

公开(公告)号：US20110074967A1

公开(公告)日：2011-03-31

申请号：US12570976

申请日：2009-09-30

申请人： Yushin Cho ,  Daisuke Hiranaka ,  Jeongnam Youn

发明人： Yushin Cho ,  Daisuke Hiranaka ,  Jeongnam Youn

IPC分类号： G06K9/36 ,  H04N5/228

CPC分类号： H04N19/152 ,  H04N19/107 ,  H04N19/115 ,  H04N19/176 ,  H04N19/63

摘要： A method of deciding a target bit rate for wavelet-based image encoding based on the wavelet coefficients is described. The target bit rate is used for maintaining a high quality image. A minimum target bit rate and a maximum target bit rate are determined. A pseudo code length corresponding to the minimum target bit rate is calculated. The pseudo code length is calculated as a function of the wavelet coefficients. The corresponding pseudo code length is calculated for the maximum target bit rate. A curve between the pseudo code length and target bit rate is derived. Slope of the curve depends on buffer fullness. Using the curve, for a given pseudo code length, an appropriate target bit rate is derived. The derived target bit rate depends on the image content, and computing resources are able to be optimally used to attain similar quality for each image block of an image.

摘要翻译： 描述了基于小波系数来确定基于小波的图像编码的目标比特率的方法。 目标比特率用于维持高质量的图像。 确定最小目标比特率和最大目标比特率。 计算与最小目标比特率对应的伪码长度。 根据小波系数计算伪码长度。 针对最大目标比特率计算相应的伪码长度。 导出伪码长度与目标比特率之间的曲线。 曲线的斜率取决于缓冲区充满度。 使用曲线，对于给定的伪代码长度，导出适当的目标比特率。 导出的目标比特率取决于图像内容，并且计算资源能够被最佳地用于为图像的每个图像块获得相似的质量。

公开(公告)号：US20100104027A1

公开(公告)日：2010-04-29

申请号：US12259649

申请日：2008-10-28

申请人： Jeongnam Youn ,  Yushin Cho ,  Daisuke Hiranaka

发明人： Jeongnam Youn ,  Yushin Cho ,  Daisuke Hiranaka

IPC分类号： H04N7/26

CPC分类号： H04N19/00066 ,  H04N19/117 ,  H04N19/14 ,  H04N19/176 ,  H04N19/30 ,  H04N19/61 ,  H04N19/85

摘要： A method and apparatus for preprocessing a video signal prior to its being encoded. During preprocessing, features are extracted from the video signal into feature planes which are each adaptively filtered in response to estimations of feature activity. After feature extraction the signal which remains is referred to as a “remaining signal”, which is then noise filtered to remove a substantial portion of the noise. The feature planes and remaining signal are recombined into a preprocessed output signal configured for receipt and processing by a video encoder. A video encoder receiving the preprocessed video signal can generate higher quality and/or lower bit rate encoded video than one receiving the original source video. Preprocessing according to the invention is particularly well suited for use with encoders adapted to remove temporal and/or spatial redundancy, such as those implemented according to the MPEG2/4, or AVC/H.264 standards.

摘要翻译： 一种用于在编码视频信号之前对视频信号进行预处理的方法和装置。 在预处理期间，将特征从视频信号提取到特征平面中，每个特征平面根据特征活动的估计被自适应过滤。 在特征提取之后，剩下的信号被称为“剩余信号”，然后对其进行噪声滤波以去除大部分噪声。 特征平面和剩余信号被重新组合成被配置为由视频编码器接收和处理的预处理输出信号。 接收预处理视频信号的视频编码器可以产生比接收原始源视频的视频编码视频更高质量和/或较低比特率编码视频。 根据本发明的预处理特别适合于适用于去除时间和/或空间冗余的编码器，诸如根据MPEG2 / 4或AVC / H.264标准实现的冗余。