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    • 4. 发明授权
    • Movement detector for television signals
    • 运动检测器用于电视信号
    • US4364087A
    • 1982-12-14
    • US174426
    • 1980-08-01
    • Richard StoreyAlan Roberts
    • Richard StoreyAlan Roberts
    • H04N5/14H04N7/18
    • H04N5/144H04N5/147
    • A movement detector for television signals measures the difference between maximum and minimum values of the movement components of a picture difference signal over a chosen interval. A television signal at an input (12) is delayed in a picture delay (2), and the delayed and undelayed signals subtracted in a subtractor (1) to form a picture difference signal. This is rectified in rectifier (3) and smoothed in a filter (4). A maximum detector (6) and a minimum detector (7) are coupled to the filter output and are re-set at prescribed intervals. A subtractor (8) determines the difference between the output of detectors (6) and (7) and this is compared with a reference value in a comparator (9), the output of which is sampled and stored in a store (10).
    • 用于电视信号的移动检测器测量在所选择的间隔上的图像差分信号的运动分量的最大值和最小值之间的差异。 在输入端(12)处的电视信号在图像延迟(2)中延迟,并且延迟和未延迟的信号在减法器(1)中减去以形成图像差分信号。 这在整流器(3)中整流并在滤波器(4)中平滑化。 最大检测器(6)和最小检测器(7)耦合到滤波器输出,并以规定的间隔重新设定。 减法器(8)确定检测器(6)和(7)的输出之间的差异,并且将其与比较器(9)中的参考值进行比较,比较器(9)的输出被采样并存储在存储器(10)中。
    • 7. 发明授权
    • Method of and apparatus for deriving a PAL color television signal
corresponding to any desired field in an 8-field PAL sequence from one
stored field or picture of a PAL signal
    • 用于从PAL信号的一个存储的场或图像中导出与8场PAL序列中的任何所需场对应的PAL彩色电视信号的方法和装置
    • US4288810A
    • 1981-09-08
    • US43540
    • 1979-05-29
    • John O. DreweryRichard Storey
    • John O. DreweryRichard Storey
    • G06T7/20H04N5/14H04N5/262H04N9/64H04N9/877H04N9/39H04N9/535
    • H04N9/877G06T7/2053H04N5/144H04N5/2625H04N9/64
    • A single field of a PAL color television signal is stored in a store (50) and provides a signal at an input (52). The signal is delayed by one-line delays (56,58) in series to provide one and two-line delayed signals. Separate switching units (60,62) select desired ones or combinations of the input and delayed signals to constitute respectively the low-frequency and chrominance part of the signal at the output (82). The switch positions are changed between fields, and for at least some fields of the PAL sequence each component of the output signal is formed by combining signals from more than one line, i.e. a halving adder (64;66) averages successive lines for the low frequency part of the signal and a halving subtractor (68) forms the difference between lines two lines apart for the chrominance part. The selector unit outputs are combined in an adder (78) which receives the output of the first selector (60), and also the difference between the output of the two selectors after band pass filtering (76). The store (50) can be replaced by a random access store capable of outputting three successive lines simultaneously. The apparatus has special utility in equipment for movement portrayal.
    • PAL彩色电视信号的单个场被存储在存储器(50)中,并在输入端(52)提供信号。 信号被串行延迟一行延迟(56,58),以提供一行和两行延迟信号。 分离的开关单元(60,62)选择所需的输入和延迟信号的组合,分别构成输出端(82)处的信号的低频和色度部分。 开关位置在场之间改变,并且对于PAL序列的至少一些场,输出信号的每个分量通过组合来自多于一个线的信号形成,即,一半加法器(64; 66)将连续的线平均为低 信号的频率部分和减法减法器(68)形成色度部分两行分开的行之间的差异。 选择器单元输出在接收第一选择器(60)的输出的加法器(78)中以及带通滤波后的两个选择器的输出之间的差(76)组合。 存储器(50)可以由能够同时输出三个连续行的随机存取存储器代替。 该装置在运动描绘设备中具有特殊效用。
    • 10. 发明授权
    • Video noise reduction system
    • 视频降噪系统
    • US4249209A
    • 1981-02-03
    • US023592
    • 1979-03-26
    • Richard Storey
    • Richard Storey
    • H04N5/21
    • H04N5/21
    • Reduction of noise in a television signal is achieved by comparing signals from successive scans to produce a difference signal. Low amplitude differences are assumed to represent noise and are attenuated. Differences above a predetermined level are assumed to represent movement and are not so attenuated. The attenuation is achieved by a multiplier which receives as multiplier the output of a non-linear transfer characteristic element. The non-linear element receives the differences after rectification and after passing through a variable-gain element. The non-linear element is such that above a predetermined value a constant predetermined minimum attenuation factor applies. A noise measurement circuit measures the noise present in the difference signal and controls the gain of the variable-gain element accordingly. Several noise-measurement circuits may be provided, a selected one of which is used in dependence upon the magnitude of the input signal to the apparatus.
    • 通过比较来自连续扫描的信号来产生差分信号来实现电视信号中的噪声的降低。 假设低幅度差异表示噪声并被衰减。 假设高于预定水平的差异表示运动并且不是如此衰减。 通过乘法器实现衰减,该乘法器作为乘法器接收非线性传递特征元素的输出。 非线性元件在整流后通过可变增益元件后接收差分。 非线性元件使得高于预定值时,应用恒定的预定最小衰减系数。 噪声测量电路测量差分信号中存在的噪声并相应地控制可变增益元件的增益。 可以提供若干噪声测量电路,其中选择的一个噪声测量电路根据输入到设备的信号的大小来使用。