公开(公告)号：US5612748A

公开(公告)日：1997-03-18

申请号：US469425

申请日：1995-06-06

申请人： Seiichi Gohshi ,  Yoshinori Izumi ,  Masahide Naemura ,  Kouichi Yamaguchi

发明人： Seiichi Gohshi ,  Yoshinori Izumi ,  Masahide Naemura ,  Kouichi Yamaguchi

IPC分类号： H04N7/015 ,  H04N7/12 ,  H04N11/04 ,  H04N11/24 ,  H04N7/24

CPC分类号： H04N11/006 ,  H04N11/048 ,  H04N7/0152 ,  H04N7/122

摘要： In the case where a wide-band color picture signal provided for a high-definition television broadcasting is sub-sampled for narrow-band transmission, in comparison with a stationary picture signal which is applied with sub-sampling according to a sampling pattern circulated at every two frames, the color picture signal in motional picture regions, which is conventionally applied with line-offset sub-sampling at every field, has a lowered resolution. To improve the resolution concerned, color difference signals in motional picture regions are applied with inter-field offset sub-sampling together with band-limitation for preventing aliasing distortion accompanied with subsampling and signal processing including interpolation for reproduction, which are effected in a form completed at every frame. As for motional picture regions having small motion, a luminance signal is applied also with similar sub-sampling and similar signal processing. As a result, the overall picture quality of the reproduced motional color picture is improve by signal processing thus adapted for color pictures in motional picture regions.

摘要翻译： 在为高频电视广播提供的宽带彩色图像信号被子采样以用于窄带传输的情况下，与根据在 每两帧通常在每个场应用线偏移次采样的运动图像区域中的彩色图像信号具有降低的分辨率。 为了提高相关分辨率，运动图像区域中的色差信号与带限制一起应用场间偏移子采样，以防止伴随二次采样的信号失真和包括用于再现的内插的信号处理，其以完成的形式 在每一帧。 对于具有小运动的运动图像区域，也应用相似的次采样和类似的信号处理的亮度信号。 结果，再现的运动彩色图像的整体图像质量通过适用于运动图像区域中的彩色图像的信号处理而得到改善。

公开(公告)号：US5311308A

公开(公告)日：1994-05-10

申请号：US672167

申请日：1991-03-19

申请人： Philippe Bernard

发明人： Philippe Bernard

IPC分类号： H04N7/015 ,  H04N7/46 ,  H04N11/04 ,  H04N7/12

CPC分类号： H04N7/0155 ,  H04N11/048 ,  H04N19/59

摘要： A method and device are provided for encoding-decoding an HD digital television signal into a narrow band encoded signal. The HD digital television signal is representative of high definition images sampled at a frequency f1, and the narrow band encoded signal corresponds to a narrow band signal sampled at f2, wherein f2

摘要翻译： 提供了一种用于将HD数字电视信号解码为窄带编码信号的方法和装置。 高清数字电视信号代表以频率f1采样的高清晰度图像，窄带编码信号对应于在f2采样的窄带信号，其中f2

公开(公告)号：US5041906A

公开(公告)日：1991-08-20

申请号：US350984

申请日：1989-05-12

申请人： Tokikazu Matsumoto

发明人： Tokikazu Matsumoto

IPC分类号： H04N11/04 ,  H04N19/00 ,  H04N19/59 ,  H04N19/80 ,  H04N19/85

CPC分类号： H04N19/587 ,  H04N11/048

摘要： A video signal is sampled with a sampling frequency which is at least four times of the highest frequency of the video signal, subsequently, sampled signals are converted into digital signals and component thereof which are higher than the highest frequency of the video signal are eliminated by a low pass filter, then, remaining sampled signals are alternately decimated by a decimation circuit, thus the sampling frequency is reduced in appearance to the half thereof.

公开(公告)号：US4322739A

公开(公告)日：1982-03-30

申请号：US137697

申请日：1980-04-07

申请人： John O. Drewery ,  Martin Weston

发明人： John O. Drewery ,  Martin Weston

IPC分类号： H04N11/04 ,  H04N11/20 ,  H04N9/32

CPC分类号： H04N11/048 ,  H04N11/20

摘要： Digital sampling of the luminance component of an N.T.S.C. color television signal is achieved by sampling with a mean frequency of twice the color subcarrier frequency to produce a sub-Nyquist sampled luminance signal. The sampling phase is changed between each pair of lines by an amount equal to half the interval between samples. The digital sampling can be applied to separate luminance and chrominance signals, to encoded N.T.S.C., and to the conversion of N.T.S.C. signals into signals of other form including PAL. Further, phase-perturbed sampling techniques permit the construction of an advantageous N.T.S.C. coder and de-coder system. The coder operates to cause spectrum folding of a luminance input signal by multiplying by a phase perturbed signal of twice the color subcarrier, and adding, the resultant being comb filtered to select frequencies which are multiples of the line frequency. The chrominance signals I, Q are combined into I.+-.Q and are modulated onto phase-perturbed subcarrier, the resultant being comb filtered to select frequencies which are of integral multiples of half the line frequencies. The two signals are then added.The comb filters mentioned can be based on one line delays or on odd multiples of one line, particularly 263 or 525 lines. A converse decoder filters then spectrum folds the luminance component, and filters and multiplies by subcarrier to derive the chrominance. Once an N.T.S.C. signal has been encoded by use of the encoder, subsequent decoding and recoding produces no theoretical impairment into the signal.

摘要翻译： N.T.S.C.的亮度分量的数字采样 通过用彩色副载波频率的两倍的平均频率进行采样来实现彩色电视信号，以产生亚奈奎斯特采样亮度信号。 采样相位在每对线之间变化一个等于采样间隔的一半的量。 数字采样可以应用于分离的亮度和色度信号，编码N.T.S.C.和N.T.S.C.的转换。 信号转换成包括PAL的其他形式的信号。 此外，相位扰动采样技术允许构建有利的N.T.S.C. 编码器和解码器系统。 编码器通过乘以两倍于彩色副载波的相位扰动信号来进行亮度输入信号的频谱折叠，并将相加的梳状滤波后的结果进行梳状滤波以选择是频率倍数的频率。 色度信号I，Q被组合成I +/- Q并且被调制到相位扰动的副载波上，其结果被梳状滤波以选择频率为一半的整数倍的频率。 然后添加两个信号。 所提到的梳状滤波器可以基于一行延迟或一行的奇数倍，特​​别是263或525行。 相反的解码器滤波器然后频谱折叠亮度分量，并且通过副载波滤波和乘法以导出色度。 一旦N.T.S.C. 信号已经通过使用编码器进行编码，随后的解码和重新编码不会对信号产生理论上的损害。

公开(公告)号：US3858240A

公开(公告)日：1974-12-31

申请号：US28902772

申请日：1972-09-14

申请人： COMMUNICATIONS SATELLITE CORP

发明人： GOLDING LEONARD S ,  GARLOW RONALD K

IPC分类号： H04N7/26 ,  H04N9/78 ,  H04N11/04 ,  H04N9/02

CPC分类号： H04N9/78 ,  H04N11/048 ,  H04N19/186

摘要： A composite color TV signal having the chrominance modulated and interleaved at the null points of the luminance frequency spectrum is comb filtered only over the region where the chrominance occurs. The filter separates luminance from chrominance. The chrominance is further demodulated and separated into its I and Q components. Each of the Y, I and Q components being a signal having a frequency spectrum with peaks at the horizontal line rate and nulls at an odd multiple of the horizontal line rate is sampled at a respective sampling frequency which is an odd multiple of half the line rate and which is also less than the Nyquist rate. Sampling at less than the Nyquist rate results in sampling energy being ''''folded back'''' into the spectrums of the respective Y, I and Q components; however, the sampling energy will be interleaved at the null points of the respective spectrums. When the sampled signals are received, the unwanted sampling energy is comb filtered out. All of the comb filters used comb only so much of the signal frequency band which includes the energy to be eliminated. Each comb filter includes a band pass filter which has a transfer characteristic which rises rapidly to a maximum level and remains constant over the frequency band of interest. The band pass filter includes phase equalization means which provides a linear phase shift versus frequency characteristic that intersects the ordinate of a phase shift versus frequency graph at a phase shift of 2n pi where n may be any integer.

摘要翻译： 在亮度频谱的零点处具有色度调制和交织的复合彩色电视信号仅在出现色度的区域进行梳状滤波。 滤光片将亮度与色度分开。 色度被进一步解调并分离成其I和Q分量。 Y，I和Q分量中的每一个是具有在水平线速率处具有峰值的频谱的信号，并且以水平线速率的奇数倍为零，以相应采样频率采样，该采样频率是线的一半的奇数倍 率，也低于奈奎斯特率。 低于奈奎斯特速率的采样导致采样能量被“折回”到相应的Y，I和Q分量的光谱中; 然而，采样能量将在相应光谱的零点处交错。 当采样信号被接收时，不想要的采样能量被梳状滤波。 所有梳状滤波器仅使用包括消除能量的信号频带的大量梳状信号。 每个梳状滤波器包括带通滤波器，其具有快速上升到最大电平并且在感兴趣的频带上保持恒定的传输特性。 带通滤波器包括相位均衡装置，其相位偏移相对于频率特性，其相位偏移相对于频率图的纵坐标在2n pi的相移处，其中n可以是任何整数。

公开(公告)号：US5067010A

公开(公告)日：1991-11-19

申请号：US334196

申请日：1989-04-06

申请人： Yoshiki Ishii ,  Makoto Shimokoriyama

发明人： Yoshiki Ishii ,  Makoto Shimokoriyama

IPC分类号： H04N7/26 ,  H04N11/04

CPC分类号： H04N11/048 ,  H04N19/587

摘要： There is provided a color video signal processing device in which pixels are thinned out for a whole picture plane with respect to each of two kinds of digital color difference signals in accordance with a predetermined role. The encoding is executed on a unit basis of a block consisting of (n.times.m) samples where (n and m are integers no less than 2) which are formed with respect to each of the two kinds of color difference signals whose pixels have been thinned out or a block consisting of (n.times.m) samples formed so as to include both of the two kinds of color difference signals whose pixels had been thinned out. The data compression is executed on a block unit basis.

摘要翻译： 提供了一种彩色视频信号处理装置，其中根据预定的作用，相对于两种数字色差信号中的每一种，整个画面的像素被稀疏。 编码是在由（n×m）个样本组成的块的单位的基础上执行的，其中（n和m是不小于2的整数），其对于像素已经被稀疏化的两种色差信号中的每一个形成 或由（n×m）个样本组成的块，形成为包括其像素已被稀疏的两种色差信号中的两者。 以块为单位执行数据压缩。

公开(公告)号：US4291331A

公开(公告)日：1981-09-22

申请号：US114041

申请日：1980-01-21

申请人： Victor G. Devereux

发明人： Victor G. Devereux

IPC分类号： H04N11/04 ,  H04N9/02

CPC分类号： H04N11/048

摘要： Digital processing of a 525 line N.T.S.C. color television signal is achieved by digitizing (40) with a sub-Nyquist sampling frequency f.sub.s which has a mean value 2 f.sub.sc .+-.1/2 f.sub.F, or more generally m f.sub.L .+-.(p+1/2) f.sub.F (where f.sub.sc, f.sub.L and f.sub.F are the subcarrier, line scan, and field scan frequencies, and m and p are integers). Conveniently the sampling frequency is exactly 2 f.sub.sc during each field and suffers a 180.degree. phase shift between fields. After processing, the signal is converted back to analogue form (50) and, to remove alias components, is comb filtered (30) over the frequency range f.sub.s -f.sub.v to f.sub.v (where f.sub.v is the maximum video frequency in the original signal) by averaging across a 262 line delay (24'), or more generally a delay of a field minus half a line. Preferably a second comb filter (10) is included before the digitizer (40); the two filters (10, 30) are then so arranged that the overall delay suffered over the whole frequency range is substantially the same. Digital comb filters can be used in which case the filters and converters are reversed in position and the initial sampling is at twice the required frequency f.sub.s. Improved diagonal luminance and vertical chrominance resolution is obtained with stationary pictures, and alias components are reduced.

摘要翻译： 525线N.T.S.C.的数字处理 通过以平均值2 fsc +/- 1/2fF或更一般地m fL +/-（p + 1/2）fF（其中fsc）的亚奈奎斯特采样频率fs数字化（40）来实现彩色电视信号 ，fL和fF是子载波，线扫描和场扫描频率，m和p是整数）。 方便地，在每个场期间采样频率恰好为2 fsc，并且在场之间遭受180°相移。 在处理之后，信号被转换回模拟形式（50），并且为了去除别名分量，在频率范围fs-fv至fv（其中fv是原始信号中的最大视频）中进行梳状滤波（30），由 通过262行延迟（24'）进行平均，或者更一般地，字段的延迟减去一半行。 优选地，在数字转换器（40）之前包括第二梳状滤波器（10）; 因此，两个滤波器（10,30）被布置成使得在整个频率范围内遭受的总延迟基本相同。 可以使用数字梳状滤波器，在这种情况下，滤波器和转换器位置相反，初始采样是所需频率fs的两倍。 通过静态图像获得改进的对角线亮度和垂直色度分辨率，降低别名分量。

公开(公告)号：US4212028A

公开(公告)日：1980-07-08

申请号：US938028

申请日：1978-08-30

申请人： John O. Drewery

发明人： John O. Drewery

IPC分类号： H04N11/04 ,  H04N9/39

CPC分类号： H04N11/048

摘要： In a method and apparatus for transcoding digital PAL color television signals between (i) a 2fsc format consisting of an encoded signal of PAL type sampled at 2fsc and (ii) a 3fsc format consisting of a luminance signal Y at 2fsc and a chrominance signal C sampled at fsc and comprising U+V and U-V on alternate lines (or either the luminance signal or composite chrominance signal by itself), avoid the need to convert the signal to analogue PAL form as an intermediate step. Converting from the 2fsc to the 3fsc format, over the chrominance bandwidth undelayed and 1- and 2-line delayed samples are combined in the proportions 1/4:1/2:1/4, and below the chrominance band the 1-line delayed samples are low-pass filtered, these together providing the luminance signal Y. To provide the chrominance signal C the undelayed and 2-line delayed signals are combined in the proportions -1/4:1/4. The low- and band-pass filters are digital transversal filters operating on adjacent samples in the signal. Transcoding in the other direction is similar.

摘要翻译： 在（i）由2fsc采样的PAL类型的编码信​​号和（ii）由2fsc的亮度信号Y和色度信号C组成的3fsc格式组成的2fsc格式之间对数字PAL彩色电视信号进行代码转换的方法和装置中， 以fsc采样，并且在交替行上（或者亮度信号或复合色度信号本身）包括U + V和UV，避免了将信号转换为模拟PAL形式作为中间步骤。 从2fsc转换为3fsc格式，在色度带宽无延迟和1和2行延迟采样中以1/4：1/2：1/4的比例组合，并且在色带上低于1行延迟 样本被低通滤波，这些一起提供亮度信号Y.为了提供色度信号C，未延迟和2行延迟信号以比例-1/4：1/4组合。 低通和带通滤波器是对信号中相邻采样进行操作的数字横向滤波器。 另一个方向的代码转换是相似的。

公开(公告)号：US4065784A

公开(公告)日：1977-12-27

申请号：US727819

申请日：1976-09-29

申请人： John P. Rossi

发明人： John P. Rossi

IPC分类号： H04N11/04 ,  H04N9/32

CPC分类号： H04N11/048

摘要： NTSC television signals are digitally encoded at sub-Nyquist rates by placing the alias components into those parts of the spectrum not normally occupied by the luminance or chrominance components of the video signal. In a system described, the sampling frequency, f.sub.s, is exactly 2f.sub.sc + 1/4f.sub.h or 2f.sub.sc - 1/4f.sub.h, where f.sub.sc is the NTSC color subcarrier frequency and f.sub.h is the line-scan frequency. Most of the alias signals in the thus encoded signal are removed from the baseband video by comb filtering between f.sub.s - f.sub.y and f.sub.v, where f.sub.v is the baseband video bandwidth.

摘要翻译： 通过将别名分量放置在通常不被视频信号的亮度或色度分量占据的频谱的那些部分中，NTSC电视信号以亚奈奎斯特速率进行数字编码。 在所描述的系统中，采样频率fs正好是2fsc + 1 / 4fh或2fsc-1 / 4fh，其中fsc是NTSC彩色副载波频率，fh是行扫描频率。 这样编码的信号中的大部分别名信号通过fs-fy和fv之间的梳状滤波从基带视频中去除，其中fv是基带视频带宽。

公开(公告)号：US5280343A

公开(公告)日：1994-01-18

申请号：US822768

申请日：1992-01-21

申请人： James R. Sullivan

发明人： James R. Sullivan

IPC分类号： H03M7/30 ,  G06T9/00 ,  H03H17/06 ,  H04N7/015 ,  H04N7/26 ,  H04N11/04 ,  H04N11/06

CPC分类号： H04N11/048 ,  H04N19/186 ,  H04N19/63 ,  H04N7/0152

摘要： General periodic, non-rectangular subsampling of color image data is accomplished with separable filters by convolving a periodically upsampled version of the color image with rotated one-dimensional filters and subsampling in a raster format.

摘要翻译： 彩色图像数据的一般周期性，非矩形子采样通过用旋转的一维滤波器和光栅格式的子采样卷积彩色图像的周期性上采样版本来实现。