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公开(公告)号：EP0499715A3
公开(公告)日：1993-03-31
申请号：EP91122016.8
申请日：1991-12-20
CPC分类号： H04N9/79 , H04N5/9261 , H04N7/125
摘要： A method and apparatus uses a spatial filter for a television recording and playback system using a spectral folding process, wherein the signal is modulated onto a folding carrier of (f h /2, f v /2), for separating the two-dimensional image spectral domain of the television signal into first and second regions that are either passed or attenuated, the partition between the regions being selected such that every point in the passed region has a mirror point mirrored about (f h /4, f v /4) in the attenuated region; and reconstructing the passed region after playback.
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12.发明公开Adaptive deemphasis and reemphasis of high frequencies in a video signal utilizing a recorded control signal 失效使用记录的控制信号的视频信号中的自适应深度和高频率的REEMPHASIS
公开(公告)号：EP0482666A3
公开(公告)日：1993-03-17
申请号：EP91118256.6
申请日：1991-10-25
CPC分类号： H04N9/7976 , H04N5/923 , H04N9/8205 , H04N9/835 , H04N9/85
摘要： A video signal recording system is disclosed which includes a circuit (80) for generating a control signal representative of the level of the high frequency portion of a full bandwidth luminance signal. An adaptive deemphasis circuit (10) reduces the level of the high frequency portion of the luminance signal in response to the control signal. A folding circuit (20) folds the high frequency portion of the deemphasized luminance signal into the low frequency portion. The folded deemphasized luminance is combined with the control signal and recorded on the video tape. A video signal playback system is disclosed which includes a circuit (50) for separating the previously recorded control signal from the previously recorded folded deemphasized luminance signal. An unfolding circuit (60) unfolds the played back luminance signal to produce a wide bandwidth deemphasized luminance signal. An adaptive reemphasis circuit (70) boosts the level of the high frequency portion of the unfolded luminance signal in response to the separated control signal.
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公开(公告)号：EP0471517A3
公开(公告)日：1993-03-17
申请号：EP91307342.5
申请日：1991-08-09
发明人： Strolle, Christopher H. , Patel, Chandrakant B. , Wedam, Werner F. , Ko, Jung-Wan , Schnitzler, Raymond , Yun, Jong-Kyung
IPC分类号： H04N9/79
CPC分类号： H04N9/835 , H04N9/7976 , H04N9/80 , H04N9/8205 , H04N9/831 , H04N9/898
摘要： An improved video signal recording system for recording a full bandwidth video signal on a limited bandwidth medium includes an encoder 10, coupled to an input terminal 5, for adaptively processing a composite video signal in response to a motion representative signal, and producing two signals; a luminance signal Lr, having attenuated high frequencies subsampled so as to be folded into a spectral hole in the low frequencies, and being bandwidth limited to the limited bandwidth of the recording medium, and a combined signal C+Mr including a chrominance and a motion component. Luminance signal recording circuitry 20 records the folded luminance signal on the medium, and chrominance signal recording circuitry 30 records the combined chrominance and motion signal on the medium. An improved video signal playback system for reproducing such a prerecorded video signal is also disclosed. The playback system consists of a luminance signal playback circuit 60 for retrieving the prerecorded luminance signal Lpb from the medium, and a chrominance signal playback circuit 80 for retrieving the prerecorded combined chrominance and motion signal C+M from the medium. A decoder 70 extracts the motion signal and the chrominance signal from the combined chrominance and motion signal and an unfolding circuit extracts the luminance high frequencies from the prerecorded folded luminance signal and adaptively regenerates the full bandwidth luminance signal in response to the motion signal. This regenerated full bandwidth luminance signal is combined with the chrominance signal to reproduce the originally recorded composite video signal. A recording medium previously recorded by such a recording system is capable of being played back on a standard playback system without objectionable artifacts in the reproduced image.
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14.发明授权
公开(公告)号：EP0698997B1
公开(公告)日：2000-05-10
申请号：EP95116314.6
申请日：1991-10-25
CPC分类号： H04N9/7976 , H04N5/923 , H04N9/8205
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公开(公告)号：EP0557641B1
公开(公告)日：1997-09-17
申请号：EP92309137.5
申请日：1992-10-07
IPC分类号： H04N9/89
CPC分类号： H04N9/797 , H04N5/935 , H04N9/7904 , H04N9/7921 , H04N9/8205 , H04N9/83 , H04N9/84 , H04N9/896 , H04N9/898
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16.发明公开Deemphasis and reemphasis of high frequencies in a video signal 失效Vorverzerrung und Nachentzerrung hoher Frequenen in einem Fernsehsignal
公开(公告)号：EP0698997A2
公开(公告)日：1996-02-28
申请号：EP95116314.6
申请日：1991-10-25
IPC分类号： H04N5/92
CPC分类号： H04N9/7976 , H04N5/923 , H04N9/8205
摘要： A system is disclosed for recording and reproducing a luminance signal (Y) on and from a medium (40). The system includes an adaptive deemphasis circuit (10) for adaptively reducing the level of a high frequency portion of the luminance signal (Y). A record circuit records the reduced level luminance signal on the medium (40). A playback circuit reproduces the reduced level luminance signal from the medium (40). A reemphasis circuit (70) non-adaptively boosts the level of the high frequency portion of the reduced level luminance signal to produce the luminance signal (Y). To this end, a circuit (73) cores a high frequency portion of the reduced level luminance signal, and the level of the cored high frequency portion is then boosted by a predetermined amount to produce the luminance signal (Y).
摘要翻译： 公开了一种用于在介质（40）上记录和再现亮度信号（Y）的系统。 该系统包括用于自适应地降低亮度信号（Y）的高频部分的电平的自适应去加重电路（10）。 记录电路在介质（40）上记录降低的亮度信号。 回放电路从介质（40）再现降低的亮度信号。 再加重电路（70）不自适应地升高降低亮度信号的高频部分的电平以产生亮度信号（Y）。 为此，电路（73）对低电平亮度信号的高频部分进行核心，然后将核心高频部分的电平升高预定量，以产生亮度信号（Y）。
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公开(公告)号：EP0559982A3
公开(公告)日：1994-09-14
申请号：EP92308888.4
申请日：1992-09-30
CPC分类号： H04N5/9264 , H04N5/783 , H04N19/124 , H04N19/14 , H04N19/146 , H04N19/147 , H04N19/15 , H04N19/154 , H04N19/172 , H04N19/176 , H04N19/18 , H04N19/196 , H04N19/60 , H04N19/94
摘要： An image compression encoding and decoding method and apparatus therefor is disclosed in which DC coefficients of a DCT block are scalar-quantized and AC coefficients are classified-vector-quantized (CVQ), and respective DCT blocks are classified by the least value of the square of the result that horizontal AC coefficients and vertical AC coefficients are subtracted from a representative value of a preset reference class. Using a multilevel compression method, lowest level codes are vector-partitioned by P-units with respect to each classified DCT block, and code books of representative vectors corresponding to the partitioned vectors are provided. Indices of corresponding representative vectors in respective code books and the classified codes are taken as encoding data corresponding to AC coefficients to keep a constant number of bits. Code books of S-units of representative vectors corresponding to errors are provided again, and corresponding indices and parity data in the respective code books are provided thereby performing a multi-level-classification-vector-quantization to be encoded. Decoding is performed in the reverse sequence of encoding. During a high speed search, only the lowest level codes having a constant number of bits are decoded regardless of the complexity of the picture.
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公开(公告)号：EP0559982A2
公开(公告)日：1993-09-15
申请号：EP92308888.4
申请日：1992-09-30
CPC分类号： H04N5/9264 , H04N5/783 , H04N19/124 , H04N19/14 , H04N19/146 , H04N19/147 , H04N19/15 , H04N19/154 , H04N19/172 , H04N19/176 , H04N19/18 , H04N19/196 , H04N19/60 , H04N19/94
摘要： An image compression encoding and decoding method and apparatus therefor is disclosed in which DC coefficients of a DCT block are scalar-quantized and AC coefficients are classified-vector-quantized (CVQ), and respective DCT blocks are classified by the least value of the square of the result that horizontal AC coefficients and vertical AC coefficients are subtracted from a representative value of a preset reference class. Using a multilevel compression method, lowest level codes are vector-partitioned by P-units with respect to each classified DCT block, and code books of representative vectors corresponding to the partitioned vectors are provided. Indices of corresponding representative vectors in respective code books and the classified codes are taken as encoding data corresponding to AC coefficients to keep a constant number of bits. Code books of S-units of representative vectors corresponding to errors are provided again, and corresponding indices and parity data in the respective code books are provided thereby performing a multi-level-classification-vector-quantization to be encoded. Decoding is performed in the reverse sequence of encoding. During a high speed search, only the lowest level codes having a constant number of bits are decoded regardless of the complexity of the picture.
摘要翻译： 公开了一种图像压缩编码和解码方法及其装置，其中对DCT块的DC系数进行标量量化并对AC系数进行分类矢量量化（CVQ），并且通过平方的最小值对各个DCT块进行分类 从预设参考类别的代表值中减去水平AC系数和垂直AC系数的结果。 使用多级压缩方法，针对每个分类的DCT块，由P个单位矢量划分最低级代码，并且提供与分割的矢量对应的代表矢量的代码簿。 将相应代码簿中的相应代表矢量的索引和分类代码作为对应于AC系数的编码数据以保持恒定的比特数。 再次提供与错误相对应的代表矢量的S单元的码本，并且提供各个码本中的对应索引和奇偶校验数据，从而执行要被编码的多级分类矢量量化。 解码以相反的编码顺序执行。 在高速搜索期间，无论图像的复杂程度如何，只有具有恒定位数的最低级代码才被解码。
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19.发明公开Digital modulators for use with subnyquist sampling of raster-scanned samples of image intensity 失效数字调制器，用于与Intensitätsabtastwerte与光栅图像的扫描的子奈奎斯特采样使用。
公开(公告)号：EP0551561A2
公开(公告)日：1993-07-21
申请号：EP92112456.6
申请日：1992-07-21
CPC分类号： H04N9/7976 , H04N9/797 , H04N9/80 , H04N9/8205 , H04N9/831 , H04N9/835 , H04N9/84 , H04N9/898
摘要： An apparatus for the tape recording of a video signal, which is a signal of a bandwidth extending up to a prescribed maximum frequency, processes this signal to generate a folded-spectrum signal. The video signal is digitized and supplied to a digital band-splitting filter (90,91,92) with a cross-over frequency at one-half said prescribed maximum frequency, for separating the digitized video signal into samples of a lower-frequency-band component and into samples of a higher-frequency-band component. A balanced modulator (98,99,100) is connected for modulating a folding carrier wave of the prescribed maximum frequency. The modulation is done in accordance with the higher-frequency-band component to generate a balanced modulation signal, which is linearly combined with the lower-frequency-band component to generate the folded-spectrum video signal. Preferably, the sampling rate of the digitized video signal is exactly the Nyquist rate of the prescribed maximum frequency, thereby reducing the balanced modulation of a suitably phased folding carrier wave to multiplication of successive samples of the modulating signal alternately by plus one and by minus one.
摘要翻译： 装置中的电子的视频信号的磁带记录，所有这些是规定带宽向上延伸到规定最大频率的基带信号是有用的，处理所述视频信号以产生折叠频谱视频信号。 视频信号数字化并以一半向具有交叉频率的数字频带分离滤波器，所述规定的最大频率，数字化视频信号分离为较低频带分量的样本及成的样品 高频带分量。 平衡调制器被连接用于调制规定最大频率，其中调制在具有较高频带分量以产生平衡调制信号雅舞蹈完成的折叠载波; 和平衡调制信号被几乎与低频带分量组合以生成折叠频谱视频信号。 优选的是，数字化视频信号的取样速率正好是规定最大频率的奈奎斯特速率，可替代地通过加一，并通过减去一个减少一个适当定相折叠载波的调制信号的连续样本的乘法的平衡调制。 搜索乘法，而无需使用数字乘法器来完成。
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公开(公告)号：EP0482945B1
公开(公告)日：1996-05-22
申请号：EP91309887.7
申请日：1991-10-25
CPC分类号： H04N9/7976 , H04N5/923 , H04N9/8205
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