公开(公告)号：US4581642A

公开(公告)日：1986-04-08

申请号：US532103

申请日：1983-09-14

申请人： Dieter Poetsch ,  Gerhard Illetschko

发明人： Dieter Poetsch ,  Gerhard Illetschko

IPC分类号： H04N5/93 ,  H04N5/335 ,  H04N5/911 ,  H04N5/21

CPC分类号： H04N5/911

摘要： The correction factor applied to a delayed television signal in a television noise reduction system and the complement of that factor applied to the undelayed television signal from which the delayed television signal is derived after averaging with the weighted delayed signal of an earlier of the preceding television frames, are modified in accordance with whether the source of the origninal television signals is or is not repeating at least one field of the television frames before going on to the next. The variation of the correction factor can also be made to depend on the number of repetitions of each frame. In an automatic system, operating in connection with a film scanner capable of scanning a motion picture film at different speeds (frames per second) to produce television signals in accordance with either the American or European television standard, the correction factor is set at the value 1 whenever a film frame is scanned for more than two half-frame television fields. For this purpose, a signal change from one state to another as soon as one full television frame has been provided by scanning a film frame. At the same time that the correction factor is set at the value 1, the writing-in of television signals into the store which produces the delayed television signal is blocked, so that the previously written-in signal, representing the same frame, is used, and the accumulation of correlated noise in the output signal is prevented.

摘要翻译： 应用于电视降噪系统中的延迟电视信号的校正因子，以及应用于延迟电视信号的延迟电视信号的补偿，该延迟电视信号在前一电视帧之前的加权延迟信号平均后导出 根据在进入下一个电视帧之前是否或者不重复电视帧的至少一个场，是否修改了电视信号的源。 校正因子的变化也可以取决于每帧的重复次数。 在自动系统中，与能够以不同速度（每秒帧数）扫描电影胶片的胶片扫描仪连接，根据美国或欧洲电视标准产生电视信号，校正系数被设定为值 每当一个电影帧被扫描超过两个半帧电视场时。 为此，一旦通过扫描胶片帧提供了一个完整的电视帧，信号就从一个状态转变到另一个状态。 在校正因子被设置为值1的同时，将电视信号写入产生延迟的电视信号的存储器中被阻止，从而使用表示相同帧的先前写入信号 并且防止输出信号中的相关噪声的累积。

公开(公告)号：US4539594A

公开(公告)日：1985-09-03

申请号：US582929

申请日：1984-02-23

申请人： Gerhard Illetschko

发明人： Gerhard Illetschko

IPC分类号： H04N5/21 ,  H04N5/14

CPC分类号： H04N5/21

摘要： The amount of noise reduction of a television signal produced by averaging corresponding pixels from one frame to the next is reduced by a correction factor when motion in the picture is detected. In order to prevent very active motion from disturbing detection of the noise level, a noise level measurement signal is subjected to a hold of its value in a time briefly preceding a highly active motion in the picture until a time shortly after the end of such highly active motion. The motion signal is processed so as to provide such a hold only when motion is highly active in the picture, and that signal is prolonged in a further circuit so that it will have a duration long enough to cover build-up of that motion and its trailing off, when the noise measurement signal is delayed by about half of the prolongation, so that the noise measurement level that is held corresponds to the noise level prior to the buildup of the motion which shortly thereafter becomes highly active. The noise value thus held controls the size of the correction factor (k) produced by the presence of the motion signal.

摘要翻译： 当检测到图像中的运动时，通过对来自一帧到下一帧的相应像素进行平均而产生的电视信号的噪声降低量减小了校正因子。 为了防止非常主动的运动干扰噪声电平的检测，噪声电平测量信号在短暂地在图像中高度活跃的运动之前的时间内经受其值的保持，直到这样高的结束后不久的时间 主动运动。 处理运动信号以便仅当图像中的运动高度活跃时提供这种保持，并且该信号在另一电路中延长，使得其具有足够长的时间以覆盖该运动的累积，并且其运动信号 当噪声测量信号被延迟大约延长的一半时，拖尾，使得保持的噪声测量水平对应于在不久之后变得高度活动的运动的积累之前的噪声水平。 由此保持的噪声值控制由运动信号的存在产生的校正因子（k）的大小。

公开(公告)号：US4549213A

公开(公告)日：1985-10-22

申请号：US611849

申请日：1984-05-18

申请人： Gerhard Illetschko

发明人： Gerhard Illetschko

IPC分类号： H04N5/21 ,  H04N5/14

CPC分类号： H04N5/21

摘要： An improved movement detector (8) for a television noise reduction system interposes a recursive filter (12) between the absolute value circuit (9) which signalizes the magnitude difference between delayed and undelayed television signals and the function generator (11) which forms the correction factor k which controls the degree of noise reduction. Especially for filtering changes in the vertical direction and the recursive filter involves a considerable saving in equipment.

摘要翻译： 用于电视噪声降低系统的改进的移动检测器（8）将延迟和未延迟的电视信号之间的幅度差异的绝对值电路（9）和形成校正的函数发生器（11）之间的递归滤波器（12） 因子k控制降噪程度。 特别是对于过滤垂直方向的变化，递归滤波器可大大节省设备。

公开(公告)号：US4485403A

公开(公告)日：1984-11-27

申请号：US377611

申请日：1982-05-13

申请人： Gerhard Illetschko

发明人： Gerhard Illetschko

IPC分类号： H04N5/21

CPC分类号： H04N5/21

摘要： In a system for noise reduction in a television signal utilizing a full frame picture store to enable averaging of corresponding signals of successful frames for noise reduction and having also a motion detector, the signal representing motion is passed through a combination of a low-pass filter and a threshold circuit of which, respectively, the cut-off frequency and the threshold value are controllable as a function of the noise amplitude. As a result, at low noise content of the input signal, no disturbing loss of sharpness of moving edges occurs, whereas at higher noise amplitudes, although noise reduction is at the cost of some loss of edge sharpness, the annoying effects of having noise reduction controlled by the noise itself, are avoided.

摘要翻译： 在利用全帧图像存储器的电视信号中降噪的系统中，能够对用于噪声降低的成功帧的对应信号进行平均并且还具有运动检测器，表示运动的信号通过低通滤波器 并且分别将截止频率和阈值作为噪声幅度的函数来控制的阈值电路。 结果，在输入信号的低噪声含量下，不会产生干扰的移动边缘的清晰度的损失，而在更高的噪声幅度下，虽然噪声降低是以边缘锐度的一些损失为代价的，但噪声降低的烦人的效果 由噪声本身控制，避免了。

公开(公告)号：US5055920A

公开(公告)日：1991-10-08

申请号：US462541

申请日：1990-01-09

申请人： Gerhard Illetschko ,  Hans-Peter Richter ,  Reiner Noske

发明人： Gerhard Illetschko ,  Hans-Peter Richter ,  Reiner Noske

IPC分类号： H04N9/64

CPC分类号： H04N9/646

摘要： Color television signals obtained by scanning a still picture are converted into digital video signals and stored in video frame memory for delaying the signals. Undelayed and delayed digital video signals are added together to produce a luminance signal in which the color carrier is suppressed. A circuit for detecting a change of picture provides a start signal after which the first frame of a still picture is stored and is then recycled until there is another picture change. To reduce the effect of recycling, the continuously supplied picture signal is modified by a factor of 1-k, and the recycled picture is modified by the factor k, wherein k varies between 0 and 1 (or 100%) and is a gradually rising function whose rise time extends over a multiplicity, for example 2-4, video frame periods.

摘要翻译： 通过扫描静止图像而获得的彩色电视信号被转换为数字视频信号并存储在视频帧存储器中用于延迟信号。 未延迟和延迟的数字视频信号被加在一起以产生抑制着色载体的亮度信号。 用于检测图像变化的电路提供开始信号，之后存储静止图像的第一帧，然后再循环直到存在另一图像改变。 为了减少再循环的影响，连续提供的图像信号被修改为1-k因子，并且再循环图像被因子k修改，其中k在0和1（或100％）之间变化并且逐渐上升 其上升时间延长多个，例如2-4个视频帧周期。

公开(公告)号：US3946153A

公开(公告)日：1976-03-23

申请号：US466820

申请日：1974-05-03

申请人： Horst Peth ,  Gerhard Illetschko

发明人： Horst Peth ,  Gerhard Illetschko

IPC分类号： H04N5/208 ,  H04N5/197

CPC分类号： H04N5/208

摘要： Correction signals for aperture correction of video signals are generated in such a way that the peak values of the correction signal produced in an aperture corrector which are dependent upon the frequency of the video signal to be corrected are maintained constant.

摘要翻译： 产生用于视频信号的孔径校正的校正信号，使得在孔径校正器中产生的校正信号的峰值取决于待校正的视频信号的频率而保持恒定。

公开(公告)号：US4276563A

公开(公告)日：1981-06-30

申请号：US857024

申请日：1977-12-02

申请人： Jurgen Heitmann ,  Gerhard Illetschko ,  Hans-Peter Maly

发明人： Jurgen Heitmann ,  Gerhard Illetschko ,  Hans-Peter Maly

IPC分类号： G01R13/00 ,  H04N17/00 ,  H04N7/02

CPC分类号： G01R13/00 ,  H04N17/00

摘要： A method and apparatus for representing the amplitude curve of a selected portion of a video signal upon the picture screen of a video display device, at least the selected portion being in digital form and not requiring conversion to analog form prior to such representation.This is achieved by using the line structure of the line raster produced on the picture screen of the video display device as a digital-analog converter. The range of possible digital values for the individual picture elements of the selected line of the video signal are allocated as reference values to respective lines of the line raster, and during each line period of the line raster the digital values of the elements are compared in succession with the appertaining reference value. When during any line period of the line raster the compared values agree the picture screen is momentarily brightened, so that each picture element of the selected line is represented on the screen with a vertical displacement determined by its digital value, so that an amplitude curve similar to an oscillogram is produced having a horizontal time axis.In a further embodiment of the invention, arranged to display the amplitude curve of selected picture elements each taken from a respective line of the video signal, the reference values are allocated to respective columns of the line raster of the display device. The result is the production of an oscillogram on the picture screen having a vertical time axis.

摘要翻译： 一种用于在视频显示设备的画面上表示视频信号的选定部分的幅度曲线的方法和装置，至少所选择的部分是数字形式，并且在这种表示之前不需要转换为模拟形式。 这是通过使用在视频显示装置的图像屏幕上产生的线栅格的线结构作为数模转换器来实现的。 将视频信号的所选行的各个像素的可能的数字值的范围分配为线栅格的各行的参考值，并且在线光栅的每个行周期期间，元素的数字值被比较 具有参考价值的继承。 当在线光栅的任何行周期期间，比较值同意图像屏幕瞬间增亮，使得所选行的每个图像元素在屏幕上以由其数字值确定的垂直位移表示，使得幅度曲线类似 产生具有水平时间轴的波形图。 在本发明的另一个实施例中，被布置为显示从视频信号的各行取出的所选择的图像元素的幅度曲线，将参考值分配给显示装置的线条光栅的相应列。 结果是在具有垂直时间轴的图像屏幕上产生一个波形图。

公开(公告)号：US3946152A

公开(公告)日：1976-03-23

申请号：US445776

申请日：1974-02-25

申请人： Gerhard Illetschko ,  Horst Peth

发明人： Gerhard Illetschko ,  Horst Peth

IPC分类号： H04N5/208 ,  H04N3/16

CPC分类号： H04N5/208

摘要： The video signals are applied to a standard aperture correction circuit and also to a non-linear circuit. The output of the non-linear circuit and the output of the standard aperture correction circuit are applied to the two inputs of a modulator whose output is combined in a summing circuit with video signals delayed by a time delay corresponding to the time delay in the non-linear circuit and modulator. In a preferred embodiment the non-linear transfer function corresponds to A.sup.2 -A and is achieved by a double-balanced modulator the DC level at whose inputs is adjusted to yield the desired transfer function.

摘要翻译： 视频信号被应用于标准孔径校正电路，也适用于非线性电路。 非线性电路的输出和标准孔径校正电路的输出被施加到调制器的两个输入，该调制器的输出在加法电路中被组合，视频信号延迟了与非非线性时间延迟相对应的时间延迟 线性电路和调制器。 在优选实施例中，非线性传递函数对应于A2-A，并且通过双平衡调制器实现，其DC输入被调整以产生期望的传递函数。