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31 条记录 (耗时 0.009 秒)

    Blur detection with local sharpness map
    1.
    发明公开
    Blur detection with local sharpness map 有权
    模糊检测与当地清晰度图

    公开(公告)号：EP2469837A2

    公开(公告)日：2012-06-27

    申请号：EP11189901.9

    申请日：2011-11-21

    申请人： Tektronix, Inc.

    发明人： Baker, Daniel G.

    IPC分类号： H04N5/14

    CPC分类号： H04N5/21 ,  G06T7/0002 ,  G06T7/13 ,  G06T2207/30168 ,  H04N5/14 ,  H04N17/004

    摘要： A single-ended blur detection probe and method with a local sharpness map for analyzing a video image sequence uses two sets of edge filters, one for "fast edges" and the other for "slow edges." Each set of edge filters includes a horizontal bandpass filter, a vertical bandpass filter and a pair of orthogonal diagonal filters where the frequency response of the fast edge filters overlap the frequency response of the slow edge filters. The video image sequence is input to each filter of each set, and the output absolute values are combined with weighting factors to produce a slow edge weighted sum array and a fast edge weighted sum array. The respective weighted sum arrays are then decimated to produce a slow edge decimated array and a fast edge decimated array. The ratio of the maximum difference value between the decimated arrays and the maximum value from the fast edge decimated array, weighted by an appropriate factor, produces a localized maximum sharpness value, the log of which produces a dimensionless blur value.

    MPEG PCR jitter, frequency offset and drift rate measurements
    2.
    发明公开
    MPEG PCR jitter, frequency offset and drift rate measurements 有权
    测量MPEG PCR抖动，-Frequenzverschiebung和-Frequenzabweichung

    公开(公告)号：EP1175109A3

    公开(公告)日：2002-02-06

    申请号：EP01305946.4

    申请日：2001-07-10

    申请人： Tektronix, Inc.

    发明人： Baker, Daniel G.

    IPC分类号： H04N17/04 ,  H04N17/00

    CPC分类号： H04N17/004

    摘要： A method of measuring MPEG PCR jitter, frequency offset and drift rate uses a selectable, constant measurement bandwidth over non-uniform PCR arrival times and a variable PCR rate. The selectable, constant measurement bandwidth is fixed at a frequency that demarcates between jitter and wander. For each received PCR value a PCR interval is determined from the arrival time of the current PCR value and the arrival time of the preceding arrival time. The PCR values, intervals and the fixed bandwidth are input to a set of difference equations, derived either from a hybrid digital-analog PLL model where the frequency offset, drift rate and jitter are extracted from various points in the PLL feedback control system or from a linear filtering approximation to a least mean square (LMS) frequency offset and an LMS drift rate estimator of a simple second order time equation for the PCR values.

    Recursive noise reduction filter for video components
    4.
    发明公开
    Recursive noise reduction filter for video components 失效
    Rekursif-RauschverminderungsfilterfürVideokomponenten。

    公开(公告)号：EP0359553A2

    公开(公告)日：1990-03-21

    申请号：EP89309308.8

    申请日：1989-09-13

    申请人： TEKTRONIX INC.

    发明人： Baker, Daniel G. ,  Cooper, William J. ,  Penney, Bruce J.

    IPC分类号： H04N17/02

    CPC分类号： H04N17/02 ,  H04N5/21

    摘要： A recursive noise reduction filter for video components reduces the noise bandwidth of a signal without degrading the signal spectrum. Demodulated chrominance or peak detected chrominance from a video signal output by a video system in response to a video test signal is input to the recursive noise reduction filter (24) which acts as a comb filter to suppress noise significantly at frequencies other than harmonics of the horizontal line rate. The signal is scaled by a first attenuator (30) having a scaling factor of (1-a), where (a) is less than one, and input to a summing circuit (32). Also input to the summing circuit is a delayed signal from a prior horizontal line scaled by the scaling factor (a). The output of the summing circuit is a filtered output signal. The signal is sampled only during horizontal lines that have the video test signal and is stored for subsequent accumulation with other horizontal lines also having the video test signal. The filter serves to add the vertically correlated part of the signal corresponding to the video test signal while averaging out the noise, thus improving the overall signal to noise ratio without degrading the signal spectrum and, hence, enhancing differential gain and phase measurements.

    摘要翻译： 用于视频组件的递归降噪滤波器可降低信号的噪声带宽，而不降低信号频谱。 由视频系统响应于视频测试信号输出的视频信号的解调色度或峰值检测色度被输入到递归噪声降低滤波器（24），该滤波器充当梳状滤波器，以在除谐波 水平线速率。 信号由具有缩放因子（1-a）的第一衰减器（30）缩放，其中（a）小于1，并输入到求和电路（32）。 还向加法电路输入来自由缩放因子（a）缩放的先前水平线的延迟信号。 求和电路的输出是滤波后的输出信号。 信号仅在具有视频测试信号的水平线中被采样，并且被存储以用于具有也具有视频测试信号的其他水平线的后续累积。 滤波器用于将对应于视频测试信号的信号的垂直相关部分相加，同时平均噪声，从而提高整体信噪比而不降低信号频谱，并因此增强差分增益和相位测量。

    Semi-automatic 3D stereoscopic disparity cursor
    5.
    发明公开
    Semi-automatic 3D stereoscopic disparity cursor 审中-公开
    Halbautomatischer 3D-Cursor mit stereoskopischerDisparität

    公开(公告)号：EP2509327A1

    公开(公告)日：2012-10-10

    申请号：EP12163394.5

    申请日：2012-04-05

    申请人： Tektronix, Inc.

    发明人： Baker, Daniel G. ,  Gopishankar, Lakshmanan

    IPC分类号： H04N13/00

    CPC分类号： H04N13/128 ,  H04N13/271 ,  H04N2013/0081

    摘要： Embodiments of the present invention provide a "disparity cursor" for easily measuring disparity within a selected region of a 3D image under test. In operation, a user places a window that defines the disparity cursor over a selected region of the 3D image under test using a mouse, keyboard, or other user-interface device. An average disparity value for the image segments contained within the window is then automatically calculated and reported to the user.

    摘要翻译： 本发明的实施例提供了用于容易地测量被测3D图像的选定区域内的视差的“视差光标”。 在操作中，用户使用鼠标，键盘或其他用户界面设备将在视觉3D图像的选定区域上定义视差光标的窗口放置。 然后，自动计算包含在窗口内的图像片段的平均视差值并将其报告给用户。

    Method and apparatus for providing a visual indication of a relationship between two signals
    8.
    发明公开
    Method and apparatus for providing a visual indication of a relationship between two signals 失效
    的方法及装置的两个信号之间的关系的光学表示。

    公开(公告)号：EP0218370A1

    公开(公告)日：1987-04-15

    申请号：EP86306838.3

    申请日：1986-09-04

    申请人： TEKTRONIX, INC.

    发明人： Horn, John J. ,  Baker, Daniel G.

    IPC分类号： H04N17/02 ,  H04S7/00

    CPC分类号： H04S7/40

    摘要： A visual indication of the relationship between first and second electrical signals, such as the left and right channel signals (2R, 2L) in a stereophonic audio system, is provided through use of a video vectorscope (22). The first and second signals are used to modulate the amplitude of two sinusoidal waves at subcarrier frequency and in phase quadrature, so as to synthesize the chrominance portion of a composite video signal. The two modulated sine waves are additively combined (12) and the resulting signal is applied to the input terminal of the vectorscope.

    Dynamic off-screen crt beam blanking circuit
    9.
    发明公开
    Dynamic off-screen crt beam blanking circuit 失效
    动态Dunkeltastschaltung一个位于阴极射线束管的画面外。

    公开(公告)号：EP0138399A1

    公开(公告)日：1985-04-24

    申请号：EP84306320.7

    申请日：1984-09-14

    申请人： TEKTRONIX, INC.

    发明人： Baker, Daniel G. ,  Ainsworth, Kenneth M.

    IPC分类号： G01R13/26

    CPC分类号： G01R13/26

    摘要： A circuit for blanking the electron beam of a cathode-ray tube (CRT) when the beam is horizontally deflected off-screen. Blanking is accomplished by comparing a horizontal drive signal to first and second reference voltages corresponding to the respective drive signals deflecting the electron beam to opposite edges of the CRT screen. The beam blanking circuit includes a differential amplifier receiving a ramp signal at its summing junction input. The differential amplifier drives a transistor connected in a high gain configuration to generate the horizontal drive signal at its collector. The horizontal drive signal is fed back through a summing resistor to the sum injunction of the differential amplifier to assure linear operation. A first comparator connected across the vase-collector junction of the transistor to blank the electron beam when the horizontal drive signal approaches saturation near one power supply voltage. A second comparator is connected between the collector and ground to blank the electron beam when the horizontal drive signal approaches ground potential. The horizontal drive signal thus deflects the electron beam to opposite edges of the CRT screen when the drive voltage varies between ground and the power supply voltage.

    摘要翻译： 一种用于消隐的阴极射线管（CRT）当光束被水平偏转离屏的电子束电路。 消隐由水平驱动信号与第一和第二参考电压对应于respectivement驱动信号使电子束偏转到CRT屏的相对边缘实现的。 光束银行电路包括差分放大器在其求和点输入接收一个斜坡信号。 差分放大器驱动连接在一个高增益配置，以产生在其集电极水平驱动信号的晶体管。 水平驱动信号被反馈通过一个求和电阻与差动放大器的总和禁令，以确保线性操作。 第一比较跨越晶体管到空白的电子束的花瓶 - 集电极结连接。当水平驱动信号接近附近的一个电源电压饱和。 第二比较器被连接在集电极与地为空白的电子束之间。当水平驱动信号接近地电势。 水平驱动信号。因此偏转电子束的阴极射线管荧光屏的相对的边缘，当驱动电压接地和电源电压之间变化。