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公开(公告)号:US07551673B1
公开(公告)日:2009-06-23
申请号:US09980443
申请日:1999-05-13
申请人: Hong Lye Oh , Yau Wai Lucas Hui
发明人: Hong Lye Oh , Yau Wai Lucas Hui
摘要: A method and apparatus of encoding digital video according to the ISO/IEC MPEG standards (ISO/IEC 11172-2 MPEG-1 and ISO/IEC 13818-2 MPEG-2) using an adaptive motion estimator. A plurality of global motion vectors are derived from the motion vectors of a previous picture in a sequence, and the global motion vectors are analyzed to determine motion characteristics. The video encoding is arranged to enable switching among different types of local motion estimators based on the motion characteristics of the moving pictures sequence. This gives rise to a motion estimation algorithm that can adaptively change its search range, search area and block matching scheme to suit different types of moving sequences.
摘要翻译: 使用自适应运动估计器根据ISO / IEC MPEG标准(ISO / IEC 11172-2 MPEG-1和ISO / IEC 13818-2 MPEG-2)编码数字视频的方法和装置。 从序列中的先前图像的运动矢量导出多个全局运动矢量,并且分析全局运动矢量以确定运动特性。 视频编码被布置成基于运动图像序列的运动特性来实现不同类型的局部运动估计器之间的切换。 这导致运动估计算法可以自适应地改变其搜索范围,搜索区域和块匹配方案以适应不同类型的移动序列。
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公开(公告)号:US06876702B1
公开(公告)日:2005-04-05
申请号:US09807497
申请日:1998-10-13
申请人: Yau Wai Lucas Hui , Hong Lye Oh , Jean-Michel Bard
发明人: Yau Wai Lucas Hui , Hong Lye Oh , Jean-Michel Bard
CPC分类号: H04N19/51
摘要: A method and apparatus of encoding digital video, for example according to the ISO/IEC MPEG standards (ISO/IEC 11172-2 MPEG-1 and ISO/IEC 13818-2 MPEG-2), which employs a local motion estimator for determining respective local motion vectors for groups of adjacent macroblocks in a picture. A local motion vector is determined for each row of macroblocks in a picture from the motion vectors of the macroblocks in that row. Then, for macroblocks in the corresponding row of a subsequently coded picture, the local motion vector can be used to select the search window used for determining the motion vectors. The local motion estimator improves search range and accuracy of macroblock motion vector detection without increasing the search window accessing bandwidth and caching requirement, and computation lode of searching.
摘要翻译: 根据ISO / IEC MPEG标准(ISO / IEC 11172-2 MPEG-1和ISO / IEC 13818-2 MPEG-2)对数字视频进行编码的方法和装置,其采用局部运动估计器来确定各自的 用于图片中的相邻宏块组的局部运动矢量。 根据该行中的宏块的运动矢量来确定图像中的每一行宏块的局部运动矢量。 然后,对于随后编码图像的相应行中的宏块,可以使用局部运动矢量来选择用于确定运动矢量的搜索窗口。 局部运动估计器提高了宏块运动矢量检测的搜索范围和精度,而不增加搜索窗口访问带宽和缓存要求,以及搜索的计算量。
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公开(公告)号:US07092441B1
公开(公告)日:2006-08-15
申请号:US09646716
申请日:1998-03-20
申请人: Yau Wai Lucas Hui , Hong Lye Oh
发明人: Yau Wai Lucas Hui , Hong Lye Oh
IPC分类号: H04N7/12
CPC分类号: H04N19/192 , H04N19/115 , H04N19/124 , H04N19/14 , H04N19/146 , H04N19/149 , H04N19/152 , H04N19/172 , H04N19/176 , H04N19/177 , H04N19/61
摘要: A method and apparatus control bit rates used in a moving pictures encoder, such as an MPEG standard encoder. A sequence of moving pictures is divided into segments each of which comprises one or more groups of pictures. A constant overall bit rate is specified for the sequence of pictures, but variable bit rate encoding is used within each segment. A difference between the number of bits allocated for encoding the segment and the actual bits used for encoding is determined, and the difference is distributed over one or more subsequent segments.
摘要翻译: 一种方法和装置控制在诸如MPEG标准编码器的运动图像编码器中使用的比特率。 一系列运动图像被分成多个段,每个段包括一组或多组图像。 为图像序列指定恒定的总比特率,但在每个片段中使用可变比特率编码。 确定分配用于编码该段的位数与用于编码的实际位之间的差异,并且该差在一个或多个后续段上分布。
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公开(公告)号:US07496142B2
公开(公告)日:2009-02-24
申请号:US11386184
申请日:2006-03-22
申请人: Yau Wai Lucas Hui , Hong Lye Oh
发明人: Yau Wai Lucas Hui , Hong Lye Oh
IPC分类号: H04N7/12
CPC分类号: H04N19/192 , H04N19/115 , H04N19/124 , H04N19/14 , H04N19/146 , H04N19/149 , H04N19/152 , H04N19/172 , H04N19/176 , H04N19/177 , H04N19/61
摘要: A method and apparatus control bit rates used in a moving pictures encoder, such as an MPEG standard encoder. A sequence of moving pictures is divided into segments each of which comprises one or more groups of pictures. A constant overall bit rate is specified for the sequence of pictures, but variable bit rate encoding used within each segment. A difference between the number of bits allocated for encoding the segment and the actual bits used for encoding is determined, and the difference distributed over one or more subsequent segments.
摘要翻译: 一种方法和装置控制在诸如MPEG标准编码器的运动图像编码器中使用的比特率。 一系列运动图像被分成多个段,每个段包括一组或多组图像。 为图像序列指定恒定的总比特率,但在每个片段中使用可变比特率编码。 确定分配用于编码段的位数与用于编码的实际位之间的差异,并且差异分布在一个或多个后续段上。
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公开(公告)号:US06982762B1
公开(公告)日:2006-01-03
申请号:US09701089
申请日:1998-05-30
申请人: Yau Wai Lucas Hui
发明人: Yau Wai Lucas Hui
IPC分类号: H04N7/18
CPC分类号: H04N19/198 , H04N19/115 , H04N19/124 , H04N19/137 , H04N19/146 , H04N19/149 , H04N19/152 , H04N19/154 , H04N19/159 , H04N19/172 , H04N19/196 , H04N19/577 , H04N19/61
摘要: A method and apparatus for encoding pictures of a moving pictures sequence according to an overall target bit-rate, such as in a MPEG video encoder. Each picture has an assigned picture coding type for which a quality factor is adaptively determined according to past bit usages, so that bits can be adaptively allocated amongst picture types for optimizing visual quality of the encoded pictures.
摘要翻译: 一种用于根据诸如MPEG视频编码器中的总目标比特率对运动图像序列的图像进行编码的方法和装置。 每个图像具有分配的图像编码类型,其根据过去的位用法自适应地确定品质因数,使得可以在图像类型之间自适应地分配比特,以优化编码图像的视觉质量。
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公开(公告)号:US06870568B1
公开(公告)日:2005-03-22
申请号:US09857121
申请日:1998-12-02
申请人: Yau Wai Lucas Hui
发明人: Yau Wai Lucas Hui
CPC分类号: H04N7/0112
摘要: A method of processing video data to detect field characteristics of the data, including processing pixel values of the data to obtain differences between the values of two successive fields of the data, processing the difference values to detect interlace patterns in the successive fields, determining if the successive fields belong to a progressive frame based on detection of the interlace patterns, and generating a progressive frame output indicating that a progressive frame has been detected. The pixel values of the first field of the successive fields and a subsequent field to the successive fields are processed to obtain further difference values to determine if the subsequent field is a redundant field, when the progressive frame output is generated.
摘要翻译: 一种处理视频数据以检测数据的场特性的方法,包括处理数据的像素值以获得数据的两个连续场的值之间的差异,处理差值以检测连续场中的交错图案,确定是否 基于隔行扫描图案的检测,连续的场属于逐行帧,并且产生指示已经检测到逐行帧的逐行帧输出。 处理连续字段的第一字段的像素值和连续字段的后续字段被处理以获得进一步的差值,以便当生成逐行帧输出时确定后续字段是否是冗余字段。
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公开(公告)号:US06356870B1
公开(公告)日:2002-03-12
申请号:US09297395
申请日:1999-08-19
申请人: Yau Wai Lucas Hui , Sapna George
发明人: Yau Wai Lucas Hui , Sapna George
IPC分类号: G10L1900
CPC分类号: H04H20/88 , G10L19/008 , G10L19/022
摘要: A method and apparatus for decoding a bitstream (100) of transform coded multi-channel audio data. The bitstream is subjected to a block decoding process (101) to obtain for each input audio channel within the multi-channel audio data a corresponding block of frequency coefficients (102). Each block of frequency coefficients (102) is assigned a higher precision inverse transform or a lower precision inverse transform according to predetermined characteristics of the audio data represented by the block. The blocks of frequency coefficients are subsequently subjected to the assigned transform (105, 106) and an output audio signal (108) is generated in response to each of the higher and lower precision inverse transform processes.
摘要翻译: 一种用于对变换编码的多声道音频数据的比特流(100)进行解码的方法和装置。 对比特流进行块解码处理(101),以获得多通道音频数据内的每个输入音频通道相应的频率系数块(102)。 根据由块表示的音频数据的预定特性,将频率系数(102)的每个块分配更高精度的逆变换或较低精度的逆变换。 随后对频率系数的块进行分配变换(105,106),并且响应于每个较高和较低精度的逆变换处理产生输出音频信号(108)。
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公开(公告)号:US06205430B1
公开(公告)日:2001-03-20
申请号:US09297112
申请日:1999-06-21
申请人: Yau Wai Lucas Hui
发明人: Yau Wai Lucas Hui
IPC分类号: G10L2100
CPC分类号: H04H20/88
摘要: A method and apparatus for decoding a multi-channel audio bitstream in which adaptive frequency domain downmixer (3) is used to downmix, according to long and shorter transform block length information (17), the decoded frequency coefficients of the multi-channel audio (12,13,14,15) such that the long and shorter transform block information is maintained separately within the mixed down left and right channels. In this way, the long and shorter transform block coefficients of the mixed down let and right channels can be inverse transformed adaptively (4,5,6,7) according to the long and shorter transform block information, and the results of the inverse transform of the long and short block of each the left and right channel added together (8,9) to form the total mixed down output of the left and right channel.
摘要翻译: 一种用于对多声道音频比特流进行解码的方法和装置,其中使用自适应频域降混混频器(3)根据长和较短的变换块长度信息(17)将多声道音频的解码频率系数 12,13,14,15),使得长和短的变换块信息在混合的左下和右声道内分开维持。 以这种方式,根据长短的变换块信息,混合向下通道和右通道的长短变换块系数可以自适应逆变换(4,5,6,7),并且逆变换的结果 将每个左右通道的长短块加在一起(8,9),形成左右通道的总混合输出。
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公开(公告)号:US07145607B1
公开(公告)日:2006-12-05
申请号:US10130093
申请日:1999-11-11
申请人: Yau Wai Lucas Hui
发明人: Yau Wai Lucas Hui
IPC分类号: H04N5/21
摘要: A method and system for digital video noise reduction which includes a picture analyser (103) for analysing pictures in a video sequence to determine the amount of moving regions therein, a noise level detector (102) for estimating the noise level (N) in the video sequence, a filtering level estimator (105, 103) for determining a maximum filtering level (L) for each picture based on the amount of moving regions and the estimated noise level (N) and a spatial filter (106) and a temporal filter (107), the temporal filter being coupled to the filter level estimator for controlling the level of filtering of each picture in the sequence in accordance with the maximum filtering level.
摘要翻译: 一种用于数字视频噪声降低的方法和系统,包括用于分析视频序列中的图像以确定其中的移动区域的量的图像分析器(103),用于估计在其中的噪声水平(N)的噪声水平检测器 视频序列,滤波电平估计器(105,103),用于基于运动区域的数量和估计的噪声电平(N)确定每个图像的最大滤波电平(L),以及空间滤波器(106)和时间滤波器 (107),所述时间滤波器耦合到所述滤波器级估计器,用于根据所述最大滤波电平来控制所述序列中的每个图像的滤波电平。
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公开(公告)号:US07046307B1
公开(公告)日:2006-05-16
申请号:US10129910
申请日:1999-11-11
申请人: Yau Wai Lucas Hui
发明人: Yau Wai Lucas Hui
IPC分类号: H04N5/14
CPC分类号: H04N17/004 , H04N17/00
摘要: A method and apparatus for noise level estimation in a digital video signal, the apparatus including a pixel activity detector that produces a mean pixel activity level for each picture in the video signal, a contrast analyzer that produces a contrast activity level for each picture and a noise level calculator that is coupled to the activity detector and contrast analyzer to produce an estimated noise level by offsetting the contrast activity level from accumulated output of the activity detector.
摘要翻译: 一种用于数字视频信号中的噪声电平估计的方法和装置,该装置包括:对视频信号中的每个图像产生平均像素活动度的像素活动检测器;对每个图像产生对比度活动度的对比度分析器;以及 噪声电平计算器,其耦合到活动检测器和对比度分析器,以通过将对比度活动水平与活动检测器的累积输出相抵消来产生估计的噪声水平。
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