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11.发明授权
公开(公告)号：US4101961A
公开(公告)日：1978-07-18
申请号：US769148
申请日：1977-02-16
申请人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher , Johan H. C. Reiber
发明人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher , Johan H. C. Reiber
CPC分类号： G06T7/0083 , A61B6/503 , G06T2207/10016 , G06T2207/10116 , G06T2207/30048
摘要： A real-time contour detector and data acquisition system for an angiographic apparatus having a video scanner for converting an X-ray image of a structure characterized by a change in brightness level compared with its surrounding into video format and displaying the X-ray image in recurring video fields.The real-time contour detector and data acquisition system includes track and hold circuits adapted to be coupled to the video scanner for sampling the brightness level of predetermined sample points of the current video field in the region of the last detected border point; a reference level analog computer circuit connected to the track and hold circuits and responsive to the sampling of the brightness level of the predetermined sample points for generating a reference brightness level at which the next border point can be detected; and analog compartor connected to the reference level circuit for comparing the brightness level along a video scan line in the current video field with that of the reference brightness level to detect the next border point; a digital processor connected to the comparator and the track and hold circuits and responsive to the detection of a border point for enabling the comparator only within an area of the current video field covered by a narrow expectation window centered about the expected next border position and for determining the sample points to be sampled by the track and hold circuits; a field memory connected to and accessible by the processor for storing the coordinates of the detected border points in the preceding two video fields to partially define the center of the expectation window; and a computer interface connected to the comparators for storing the detected border points in the computer.
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公开(公告)号：US4096529A
公开(公告)日：1978-06-20
申请号：US781209
申请日：1977-03-25
申请人： Robert E. Baum , Robert A. Winter
发明人： Robert E. Baum , Robert A. Winter
CPC分类号： H04N5/211
摘要： The presence of ghosts or other similar interference in a television signal is detected and indicated by comparing the peak voltage levels of the horizontal blanking pulses on opposite sides of the horizontal synchronizing pulses in the television signal.
摘要翻译： 通过比较电视信号中的水平同步脉冲的相对侧的水平消隐脉冲的峰值电压电平来检测并指示电视信号中存在重影或其它类似干扰。
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公开(公告)号：US4000365A
公开(公告)日：1976-12-28
申请号：US437901
申请日：1974-01-30
申请人： John M. Vandling
发明人： John M. Vandling
CPC分类号： H04N1/32614
摘要： A facsimile receiver which may be acoustically coupled to a telephone transmission line comprises a preamplifier for amplifying frequency modulated signals. The output of the preamplifier is coupled to a demodulator comprising a single shot multivibrator and an average DC voltage detector connected to the output of the multivibrator. The output of the average DC voltage detector is applied to a stylus driver which controls the marking of a copy medium by a stylus. A signal quality detector and an indicator are coupled to the output of the preamplifier to provide an operator with an indication of poor signal reception quality.
摘要翻译： 可以声学耦合到电话传输线的传真接收机包括用于放大调频信号的前置放大器。 前置放大器的输出耦合到解调器，该解调器包括连接到多谐振荡器的输出的单次多谐振荡器和平均直流电压检测器。 平均直流电压检测器的输出被应用于通过触笔控制复印介质的标记的触控笔驱动器。 信号质量检测器和指示器耦合到前置放大器的输出，以向操作者提供不良信号接收质量的指示。
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公开(公告)号：US3984862A
公开(公告)日：1976-10-05
申请号：US547255
申请日：1975-02-05
申请人： LeRoy A. Volz
发明人： LeRoy A. Volz
CPC分类号： H04N17/00
摘要： The overall response of a television receiver is displayed on the face of the cathode ray tube of the receiver involved by test apparatus which requires electrical connection only to the antenna terminals of the television receiver and the mounting of a small light sensor unit onto the face of the cathode ray tube. The test apparatus generates an amplitude modulated signal having a video carrier frequency corresponding to that of a selected television channel. The amplitude modulated video carrier frequency signal includes an envelope containing synchronizing pulses for operating the sweep circuits of the television receiver in a normal manner and which clamps the automatic gain control circuits of the receiver to a desired level and a video signal to produce a given brightness reference background on the tube face which is preferably gray or black. Periodically, the main video carrier is interrupted for the generation of a constant amplitude test carrier frequency signal. This test carrier frequency signal progressively varies in frequency during successive fields, so the test carrier frequencies will scan through the entire band of frequencies for the channel involved. The points in time at which the main video carrier is periodically interrupted is controlled so that the beam trace or traces produce a rectangle of light resulting from the video signal detected from the test carrier frequency. This rectangle of light appears opposite the light sensor unit. The brightness of the rectangle of light during each field is a measure of the overall response of the radio frequency and intermediate frequency tuned circuits in the receiver at the test carrier frequency involved. The light sensor output from each field is stored and then utilized to modulate the video carrier to produce a response curve on a curve display area of the cathode ray tube.
摘要翻译： 电视接收机的整体响应显示在与仅由电视接收机的天线端子电连接并且将小型光传感器单元安装在面板上的测试装置所涉及的接收器的阴极射线管的表面上 阴极射线管。 测试装置产生具有对应于所选择的电视频道的视频载波频率的幅度调制信号。 幅度调制视频载波频率信号包括一个包含用于以正常方式操作电视接收机的扫描电路的同步脉冲的包络，并将接收机的自动增益控制电路钳位到期望的电平和视频信号以产生给定的亮度 在管面上的参考背景优选为灰色或黑色。 周期性地，主视频载波被中断以产生恒定幅度测试载波频率信号。 该测试载波频率信号在连续的场中频率逐渐变化，因此测试载波频率将扫描所涉及的信道的整个频带。 控制主视频载体周期性中断的时间点，使得光束轨迹或迹线产生由从测试载波频率检测的视频信号产生的光矩形。 这个矩形的光线与光传感器单元相对。 每个场中光矩形的亮度是所涉及的测试载波频率的接收机中射频和中频调谐电路的整体响应的度量。 存储来自每个场的光传感器输出，然后用于调制视频载体，以在阴极射线管的曲线显示区域上产生响应曲线。
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公开(公告)号：US3862356A
公开(公告)日：1975-01-21
申请号：US21600172
申请日：1972-01-07
申请人： TEKTRONIX INC
发明人： OLSON RONALD ARTHUR , LUTEN GERRIT
CPC分类号： H04N17/00
摘要： A television monitor apparatus is disclosed which is capable of measuring a plurality of input television signals and the differences therebetween without disconnecting one input signal and connecting another. The television picture monitor apparatus includes a plurality of input connectors and amplifier circuits for selectably receiving and amplifying either one of the plurality of input signals or differences between selected two signals thereof by controlling a selection switch provided on a front panel of the television picture monitor apparatus. In the difference mode differential amplifiers employed for amplifying each input signal and the difference between selected two input signals remarkably reduce the common mode signal thereby providing accurate differences in time and color characteristics therebetween.
摘要翻译： 公开了一种能够测量多个输入电视信号及其差异而不断开一个输入信号并连接另一输入信号的电视监视器装置。 电视图像监视器装置包括多个输入连接器和放大器电路，用于通过控制设置在电视图像监视器设备的前面板上的选择开关来可选地接收和放大多个输入信号中的任一个或其选择的两个信号之间的差异 。 在用于放大每个输入信号的差分放大器和所选择的两个输入信号之间的差异放大器中，差模放大器显着地减小了共模信号，从而提供了它们之间的时间和色彩特性的准确差异。
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公开(公告)号：US3773972A
公开(公告)日：1973-11-20
申请号：US3773972D
申请日：1972-02-09
申请人： PHILIPS CORP
摘要： A system for measuring signal stength wherein line flyback pulses are applied to a digital counting means during a counting period proportional to the signal level, which counting means are periodically reset to zero by the field flyback pulses.
摘要翻译： 一种用于测量信号长度的系统，其中行数回扫脉冲在与信号电平成比例的计数周期期间被施加到数字计数装置，该计数装置通过场反激脉冲周期性地复位为零。
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公开(公告)号：US3700799A
公开(公告)日：1972-10-24
申请号：US3700799D
申请日：1970-04-03
申请人： US NAVY
发明人： STEDMAN ROBERT J
CPC分类号： G01S3/7864
摘要： A video gate generator for excluding the sensing of any target other than a target inside the gate generated by digitally sampling a portion of a television raster and producing an output gate comprising left and right boundaries and upper and lower boundaries for superposition on a TV monitor.
摘要翻译： 一种视频门生成器，用于排除通过对电视光栅的一部分进行数字采样产生的门外的任何目标的感测，并产生包括左边界和右边界的输出门以及用于在TV监视器上叠加的上下边界。
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18.发明授权
公开(公告)号：US3624283A
公开(公告)日：1971-11-30
申请号：US3624283D
申请日：1970-04-29
发明人： LOGAN DAVID J
CPC分类号： G06K11/02 , G05B19/4205
摘要： In a digitizing system, a line follower automatically follows a line or edge to be digitized and intermittently outputs data representing the coordinates of points spaced along the line. This coordinate information is supplied to a computer and, through the computer, to a recorder or other terminal device using such information. The computer memory temporarily stores, in a pushdown list, a plurality of the most recent sets of coordinate data supplied by the line follower. Should the line follower accidentally stray from the line being digitized, the operator, by appropriately conditioning the system, may cause the system to utilize the temporarily stored coordinate data to cause the line follower to be driven in a plotting or backspacing mode to retract its path of movement for return to a previously properly taken point on the line being digitized. Any erroneous coordinate data taken during the departure of the line follower from the line being digitized is erased or destroyed during the backspacing operation so that after the full digitizing operation is completed, the result is a clean record wherein the recorded data represents points located in succession along the digitized line without any ''''switch-backs'''' or undesirably large gaps in such data.
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公开(公告)号：US3621129A
公开(公告)日：1971-11-16
申请号：US82053269
申请日：1969-04-30
申请人： METALS RESEARCH LTD
发明人： FISHER COLIN
CPC分类号： H04N5/14
摘要： Detection devices for image analysis systems employing line scanning in which detection is in part governed by inspecting video signal from portions of scan lines intersecting a feature under analysis other than that currently being scanned. In one device a reference level voltage for threshold detection is generated by generating mean of the whitest and blackest signal levels of image portions immediately before and after that currently under analysis so that the reference threshold is constantly equated to the black and white content of the image under analysis. In another device the inspection of image portions before and after that currently under analysis allow a decision to be made as to whether the current portion is inside or outside a feature defined only by a boundary having an unsymmetrical density profile. Another system allows a tentative detection decision to be made from the information from one portion of a line scan and a final detection decision to be made after comparing the provisional decision with a later decision based on information from preceding and following line scanned portions relative to that on which the tentative decision was made.
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公开(公告)号：US3531587A
公开(公告)日：1970-09-29
申请号：US3531587D
申请日：1967-11-15
发明人： JAMES DONALD N
CPC分类号： H04N17/00
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