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公开(公告)号：EP0156134A3
公开(公告)日：1988-08-31
申请号：EP85101322
申请日：1985-02-08
IPC分类号： H04N05/21
CPC分类号： H04N7/0132 , H04N5/20
摘要： Perception of flicker in interlaced video images is suppressed by testing each pixel in an image for an intensity value below a first predetermined threshold; modifying, for each tested pixel, an intensity value representation for each nearest neighbour pixel along a first axis of said interlaced image having an intensity value exceeding a second predetermined threshold, if the intensity value of the tested pixel is below the first predetermined threshold; and displaying, on a video display device, an interlaced image generated by the steps of testing and modifying.
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公开(公告)号：EP0167387A3
公开(公告)日：1988-07-27
申请号：EP85304696
申请日：1985-07-01
发明人： Ohta, Haruo , Tomita, Masao
CPC分类号： H04N5/21
摘要： A video signal processing apparatus comprises a digital filter (118) for passing a specific frequency band of a digitized input luminance signal; non-linear processing means (122) for non-linearly processing the signal passed through said digital filter (118); and arithmetic means (123) for mixing said digitized input luminance signal directly or after delayed by a specific time with an output signal of said non-linear processing means, wherein the passing band component of said digital filter (118) is suppressed or emphasized depending on the input signal amplitude of said non-linear processing means. An embodiment for two-dimensional processing is also disclosed using a plurality of filters and a plurality of non-linear processing means with a single arithmetic means for mixing the outputs of the non-linear processing means.
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公开(公告)号：EP0004728A3
公开(公告)日：1979-10-31
申请号：EP79300450
申请日：1979-03-21
IPC分类号： H04N05/21
CPC分类号： H04N5/21
摘要： Reduction of noise in an electrical, e.g. 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 (26) which receives as multiplier the output of a non-linear transfer characteristic element (24). The non-linear element receives the differences after rectification (100) and after passing through a variable-gain element (102). The non-linear element (24) is such that above a predetermined value a constant predetermined minimum attenuation factor applies. A noise measurement circuit (X) measures the noise present in the difference signal and controls the gain of the variable-gain element (102) 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.
摘要翻译： 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。 衰减由乘法器实现，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。 非线性元件使得在高于预定值的情况下，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。 可以提供几个噪声测量电路，其中选择的一个噪声测量电路根据到设备的输入信号的大小来使用。
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4.发明公开Method and apparatus for measuring the cathode beam currents in television receivers 失效用于测量电视接收机中阴极射线电流的方法和装置
公开(公告)号：EP0174433A3
公开(公告)日：1988-04-20
申请号：EP85105560
申请日：1985-05-07
CPC分类号： H04N9/645
摘要： Zur Kontrastregelung in Fernsehempfängern ist es nötig, die in der Bildröhre flirßenden Kathodenstrahlströme zu messen. Bei den bisher bekannten Meßverfahren treten Meßfehler auf, die auf kapazitive Lasten in der Endstufe, in den Zuleitungen zur Bildröhre und in der Bildröhre selbst zurückzuführen sind. Mit der vorliegenden Erfindung werden diese Meßfehler dadurch stark reduziert, daß der Strahl strom und die durch kapazitive Lasten verursachten positi ven und negativen Halbwellen des zur Steuerelektrode der Bildröhre fließenden Wechselstromanteils aufsummiert wer den, daß das Summensignal tiefpaßgefiltert und daß die dem Kathodenstrahlstrom proportionale Meßspannung am Ausgang des Tiefpaßfilters abgegriffen wird.
摘要翻译： 为了在电视接收机中设置对比度，需要测量显像管中的阴极射束电流。 在迄今为止已知的测量方法中，测量误差发生在输出级的电容性负载中，在导管和显像管本身中。 利用本发明，由于流过电容负载引起的显像管控制电极的交流分量的波束电流和正和负半波被加在一起，所以这些测量误差被大幅降低， 和信号被低通滤波，并且在低通滤波器的输出处拾取与阴极束电流成比例的测量电压。
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公开(公告)号：EP0147138A3
公开(公告)日：1986-02-19
申请号：EP84308709
申请日：1984-12-13
CPC分类号： H04N7/0132 , H04N5/915 , Y10S348/91
摘要： In a field signal-frame signal conversion system including means for applying a'delayed field signal.(18) delayed by one half of a horizontal scanning period and a direct field signa) (17), which is the same as the delayed field signal (18) but not delayed, and switching means (16) for alternately selecting the field signals at a time interval of one vertical scanning period to provide a frame signal, a circuit for preventing appearance of flicker attributable to the field signal - frame signal conversion, the circuit comprising a synchronizing signal separating means (50) separating a synchronizing signal from the frame signal appearing at the output of the switching means (16), a sampling pulse generating means (52) generating, in response to the application of the separated synchronizing signal, a sampling pulse signal synchronous with the change points from the sync tip level to the pedestal level and having a pulse width equal to or smaller than that of the serrating pulses, a sample and hold means (53) operating in response to the sampling pulse signal for sampling the frame signal appearing at the output of the switching means (16), a clamping voltage generating means (54) comparing the output signal of the sample and hold means (53) with a reference value and generating a voltage signal proportional to the difference therebetween, and two clamping circuits (34, 33) connected to the direct and delayed field signal lines (17,18) respectively and controlled by the output signal of the clamping voltage generating means (54) for maintaining constant the pedestal level of the direct and delayed field signals.
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公开(公告)号：EP0133026A3
公开(公告)日：1985-04-10
申请号：EP84305095
申请日：1984-07-26
申请人： SONY CORPORATION
IPC分类号： H04N05/21
摘要： @ The video signal processing apparatus of the present invention is comprized of a video signal dividing circuit for dividing the input video signals into N channels, and a signal combining circuit for combining these N-channel signals into the original unitary channel signals. There is disclosed an appararus for dividing video signals, wherein, in the process of dividing input video signals into N-channel signals, the input video signals are written into a memory while write address control is performed in dependence upon clock signals of the input video signals. These N-channel signals represent N signal subsections divided from a section corresponding to a predetermined unit time duration of the input video signals. Signals are read out from these subsections starting from the foremost data of each said subsection as read-out address control cycles sequentially through these subsections. N latch circuits are used for sequentially latching signals read out from the memory with the aid of N latch pulses each having a frequency equal to 1/N times the clock signal frequency and phase-shifted relative to one another by a duration equal to the clock signal period. The output signals from the N latch signals are taken as said N-channel signals. There is also disclosed a signal combining or restoration circuit, wherein, in the process of effecting image processing of said N-channel signals as required, separately compressing the processed signals along time axis and recombining the resulting signals into single-channel signals, the N-channel signals are written into the memory as control cycles sequentially through the respective channels, and the N-channel signals thus written into the memory are read out in the original signal sequence.
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公开(公告)号：EP0067585A3
公开(公告)日：1984-01-18
申请号：EP82302739
申请日：1982-05-27
申请人： RCA CORPORATION
摘要： Video is applied via a gain controlled IF amplifier (11) to a video detector (13) and amplifier (15). Sync and equalising pulses are fed from the amplifier to an active filter (21-26) and then to a comparator (30), which produces an output variation for changing an AGC voltage produced by generator (40) and AGC capacitor (41) if the pulse peaks exceed a threshold. The filter (21-26) delays and attenuated noise impulses, but can also cause noise impulses to remain above the threshold for a period of time defined by pulse stretching in the filter. A transistor (32) is responsive to a potential difference of predetermined sense and magnitude between the input and output of the filter to curtail the output variation of the comparator (30). Such a difference exists when a delayed leading edge of a noise pulse is present at the output of the filter and the trailing edge is at the input.
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8.发明公开
公开(公告)号：EP0003595A3
公开(公告)日：1979-09-05
申请号：EP79100352
申请日：1979-02-07
发明人： Hassler, Dieter
CPC分类号： H04N5/21 , A61B8/14 , G01S7/06 , G01S7/52033 , G01S7/52053
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公开(公告)号：EP0218454A3
公开(公告)日：1988-06-08
申请号：EP86307507
申请日：1986-10-01
CPC分类号： H04N9/77
摘要： A video signal processor is disclosed which detects (20) the presence of a complementary-color vertical transition, for instance by detecting that a given line has color information represented by a color vector at a given phase angle, and that the preceding line has color information represented by a color vector at the same phase angle to obtain an indication of the presence of a complementary-color vertical transition. If a complementary-color vertical transition is detected, then the comb filtered luminance and chrominance signals are selectively coupled (30) to the luminance and chrominance processing channels (40, 50) so that the chrominance processing channel (50) receives primarily color information and the color information is excluded from the luminance processing channel (40). This counteracts the adverse effects of the complementary-color vertical transition.
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公开(公告)号：EP0221734A3
公开(公告)日：1988-06-01
申请号：EP86308258
申请日：1986-10-23
申请人： RCA CORPORATION
发明人： Wargo, Robert Andrew
CPC分类号： H04N9/646
摘要： A dot interference detector for a video signal processor including a comb filter (10) detects (20) the respective phases (
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