公开(公告)号：US5329311A

公开(公告)日：1994-07-12

申请号：US59378

申请日：1993-05-11

申请人： Rabab K. Ward ,  Qin Zhang

发明人： Rabab K. Ward ,  Qin Zhang

IPC分类号： H04N17/00 ,  H04N17/02

CPC分类号： H04N17/00

摘要： A method of determining the noise content of a video signal by digitizing a frame based on the video signal to provide a digitized signal which is then filtered via a high pass filter. The filtered image is then divided into a plurality of subimages and the noise signal in each of the subimages is determined from a selected number of subimages having the lowest noise signal are further processed to determine the average noise in the selected subimages and the signal-to-noise ratio determined. The carrier-to-noise ratio may also be determined if desired.

摘要翻译： 一种通过基于视频信号数字化帧来确定视频信号的噪声含量的方法，以提供经过高通滤波器滤波的数字化信号。 滤波后的图像然后被划分成多个子图像，并且从具有最低噪声信号的选定数量的子图像中确定每个子图像中的噪声信号，以进一步处理以确定所选择的子图像中的平均噪声，并且信号到 - 确定比例。 如果需要，也可以确定载波噪声比。

公开(公告)号：US6061100A

公开(公告)日：2000-05-09

申请号：US941238

申请日：1997-09-30

申请人： Rabab K. Ward ,  Julong Du ,  Pingnan Shi ,  Xiaoli Li

发明人： Rabab K. Ward ,  Julong Du ,  Pingnan Shi ,  Xiaoli Li

IPC分类号： H04N5/21

CPC分类号： H04N5/21

摘要： A method of reducing noise in video signal, by processing the pixels of a process frame of video signal in conjunction with a selected number of previously processed frames to determine values for target pixels in the process frame by applying a temporal motion detector to determine whether a target pixel has a still or motion status and further processing the pixels with motion status by impulse recognition step to further determine whether the pixel should be classified as having a still or a motion status. The pixels are then checked via a spatial motion detecting step to obtain a motion index value to the pixels and the motion index value is used in a motion adaptive temporal filter to define the pixel value of the still pixel. The motion index value of the pixels is used to set a dynamic threshold in a detailed motion active spatial filter to define the pixel value for the motion pixels. The system may be integrated with a converter box for converting digital signals to analog for use in conjunction with analog television sets services by digital signals.

摘要翻译： 一种降低视频信号噪声的方法，通过处理视频信号的处理帧的像素与选定数量的先前处理过的帧进行处理，以通过应用时间运动检测器来确定处理帧中的目标像素的值，以确定是否 目标像素具有静止或运动状态，并通过脉冲识别步骤进一步处理具有运动状态的像素，以进一步确定像素是否应被分类为具有静止或运动状态。 然后通过空间运动检测步骤检查像素，以获得对像素的运动索引值，并且运动索引值用于运动自适应时间滤波器中以定义静止像素的像素值。 像素的运动索引值用于在细节运动有源空间滤波器中设置动态阈值以定义运动像素的像素值。 该系统可以与用于将数字信号转换为模拟的转换器盒一起用于通过数字信号与模拟电视机服务结合使用。

公开(公告)号：US5221967A

公开(公告)日：1993-06-22

申请号：US696945

申请日：1991-05-08

申请人： Rabab K. Ward ,  Qin Zhang

发明人： Rabab K. Ward ,  Qin Zhang

IPC分类号： G01R27/28 ,  G01R31/28 ,  H04N7/10 ,  H04N17/00

CPC分类号： H04N17/00 ,  G01R27/28 ,  G01R31/2825 ,  H04N7/10

摘要： A cable television signal for example may be monitored and impairments determined and in many cases classified by grabbing at least portion of a transmitted frame of video information somewhere on the network to provide a video signal, performing a two dimensional Fourier transform on the video signal and analyzing the Fourier transform so obtained to determine the location of areas indicating above average occurrence of specific frequencies to provide an indication of an impairment.

摘要翻译： 例如可以监视有线电视信号并确定损害，并且在许多情况下通过在网络上的某处抓取视频信息的发送帧的至少一部分来分类，以提供视频信号，对视频信号执行二维傅立叶变换，以及 分析如此获得的傅里叶变换以确定指示高于特定频率的平均出现的区域的位置，以提供损伤的指示。

公开(公告)号：US5661529A

公开(公告)日：1997-08-26

申请号：US485760

申请日：1995-06-07

申请人： Rabab K. Ward

发明人： Rabab K. Ward

IPC分类号： H04N17/00 ,  H04N5/21

CPC分类号： H04N17/00

摘要： A method for determining the composite triple beat (CTB), composite second order beat (CSO) and/or SNOW noise of cable television signal is obtained by digitizing a quiet line and determining the Fourier transform of the digitized signal and measuring the energy in the frequency range corresponding to the particular impairment of being determined. Repeating this process a significant number of time to accumulate a significant number N of values for the impairment and then using the average of the accumulated intensity to define the amount of the impairment.

摘要翻译： 通过数字化静音线并确定数字化信号的傅立叶变换并测量有线电视信号中的能量来获得用于确定有线电视信号的复合三拍（CTB），复合二阶拍频（CSO）和/或SNOW噪声的方法 频率范围对应于确定的特定损害。 重复此过程相当多的时间来累积显着数量的N个减值值，然后使用累积强度的平均值来定义损失的金额。

公开(公告)号：US5585859A

公开(公告)日：1996-12-17

申请号：US245134

申请日：1994-05-17

申请人： Rabab K. Ward ,  Pingnan Shi ,  Qiaobing Xie

发明人： Rabab K. Ward ,  Pingnan Shi ,  Qiaobing Xie

IPC分类号： H04N5/21 ,  H04N5/217

CPC分类号： H04N5/21

摘要： The system for reducing composite beat, composite second order beat and thermal (snow) noise impairments in a television system digitizes individual frames to apply digitized a grey scale values (v.sub.(i,j)) to the pixels in the frames and then applying a spatial filter to a block of pixels including the then current pixel being processed to determine the pixel (P.sub.(min)) with the minimum grey scale value (v.sub.(min)) and the pixel (P.sub.(max)) in the block with the maximum grey scale value (v.sub.(min)). V.sub.(max) -v.sub.min is compared with a threshold value (v.sub.(T)) and if v.sub.(max) -v.sub.min) >v.sub.(T), the value (v.sub.(i,j)) of the pixel being processed remains unchanged, but if v.sub.(max)-v.sub.(min).notgreaterthan.v.sub.(T), a value (v.sub.(av.)) equal to the weighted average value of pixels in the block is used as the grey scale value v.sub.(R-i,j) for the pixel being processed. The block preferably, will be composed of a number of adjacent pixels in a row or a number of adjacent pixels in a column or both processed simultaneously or preferably in sequence i.e. the pixels processed along the rows and then along the columns with the values assigned to the pixels when processing along the rows used as the initial values for the pixels when processing along the columns.In more preferred cases, a plurality of frames are each subject to static filtering and then the adjacent frames in the sequence are subject to time filtering (provided motion is not detected) to provide a better average value vZ.sub.(mean) for the processed pixel in the specific frame being processed.

摘要翻译： 用于减少电视系统中的复合节拍，复合二阶节拍和热（雪）噪声损伤的系统将单个帧数字化以将数字化的灰度值（v（i，j））应用于帧中的像素，然后应用 空间滤波到包括正在处理的当前像素的像素块，以确定具有最小灰度值（v（min））的像素（P（min））和像素（P（max）） 最大灰度值（v（min））。 将V（max）-vmin与阈值（v（T））进行比较，如果v（max）-vmin）> v（T），则正在处理的像素的值（v（i，j））保持不变 ，但是如果v（max）-v（min）NOTGREATER v（T），将等于块中的像素的加权平均值的值（v（av。））用作灰度级值v（Ri，j ）用于正在处理的像素。 该块优选地将由列中的多个相邻像素或多个相邻像素组成，或者两者同时或优选地依次处理，即沿着行被处理的像素，然后沿着具有值分配给 当沿列进行处理时，像素在沿着列进行处理时用作像素的初始值。 在更优选的情况下，多个帧各自经历静态滤波，然后序列中的相邻帧经历时间滤波（提供的运动未被检测），以为处理后的像素提供更好的平均值vZ（均值） 正在处理的具体框架。

公开(公告)号：US5323239A

公开(公告)日：1994-06-21

申请号：US59387

申请日：1993-05-11

申请人： Rabab K. Ward ,  Pingnan Shi

发明人： Rabab K. Ward ,  Pingnan Shi

IPC分类号： H04N5/21

CPC分类号： H04N5/21

摘要： A method for reducing the effect of a composite triple beat (CTB) of a visual image is obtained by digitizing the signal for the image frame, dividing the digital signal into a plurality of stripes extending perpendicular to the horizontal lines of the image to form subpictures and determining the average intensity of the signal in each of the horizontal lines of each of the subpictures. An average value for each of the lines in each of the subpictures is then obtained and the component of the signal forming the composite triple beat signal for each line of each subpicture is estimated. Then the estimated triple beat signal is subtracted from its corresponding portion of the digitized signal to provide corrected subpictures. The corrected subpictures are then recombined to form a clean signal providing the cleaned visual image. In a preferred arrangement plurality of consecutive frames are treated as above described to provide average corrections for each line based on the average for the corresponding lines in the subpictures in the plurality of frames and then the subpictures for the frame to be shown next are corrected using the average corrections values to provide an even clearer signal.

摘要翻译： 通过对图像帧的信号进行数字化，将数字信号分割为垂直于图像的水平线延伸的多个条纹来获得用于降低视觉图像的复合三重拍子（CTB）的效果的方法，以形成子图像 以及确定每个子图像的每条水平线中的信号的平均强度。 然后获得每个子图像中的每行的平均值，并且估计形成每个子图的每一行的复合三重拍频信号的信号分量。 然后从数字化信号的相应部分中减去估计的三重拍频信号，以提供校正的子画面。 然后将校正的子图重新组合以形成提供清洁的视觉图像的干净信号。 在优选的布置中，如上所述处理多个连续的帧，以基于多个帧中的子图中的相应行的平均值为每行提供平均校正，然后使用下面的示例来校正下面要示出的帧的子图 平均校正值提供更清晰的信号。