Abstract: A video compensation circuit for compensating the displayed intensity of isolated pixels is disclosed. The video compensation circuit includes a shift register (20) having a plurality of stages (11,13,15) for storing and shifting a serially input digital video signal (DV) and for outputting an output digital video signal (DDV), detection circuitry (17) responsive to the respective outputs of the shift register stages for providing a detection output indicative of the presence of a predetermined sequence of digital video data in the shift register stages, and synchronizing circuitry (19) coupled to the detection circuit for providing in response to the detection output a control signal (DCS) synchronized to the bit of the output digital video signal which corresponds to the pixel to be compensated.

Abstract: A method and apparatus for retouching an image represented by color printing data in the form of a number of sets of input data, one set for each of the printing colors, is described. The apparatus comprises a source (1) of color component image data; a reference data set generator (2;9,10) for generating a reference data set comprising the color components of a limited plurality of reference colors; and a color converter (2;9,10) for generating a temporary data set from the color printing data and the reference data set, the temporary set representing the original image in terms of the reference colors. A refresh store (3) receives the temporary data set and feeds the temporary data set to a monitor (8) via a conversion system. The conversion system includes one or more look-up tables (5) defining printing ink modifying functions and an operator table (6) for controlling the contents of the or each look-up table (5).

Abstract: The circuit provides a correction signal generated by two-fold differentiation of the video signal which is then added to the video signal. According to the invention, a high pass filter is disposed in the path of the correction signal. The corrected video signal is limited to the black level value and to the white level value with the amplitude limiters. This assures the optimum operational mode of the circuit independent of the frequency course of the frequencies of the video signal in each case.

Abstract: A video contour correction system for a video display unit consists of an auxiliary deflection coil having its coil axis parallel with the axis of the horizontal deflection coil of the cathode-ray tube, a differentiating circuit for detecting the primary differential waveform of a video signal and an amplification circuit for amplifying the output of the differentiating circuit. The output current of the amplification circuit is supplied to the auxiliary deflection coil so that the magnetic field produced by said auxiliary deflection coil is superposed on the horizontal deflection magnetic field produced by said horizontal deflection coil, thereby improving the border contrast of the picture.

Abstract: Apparatus and method for sensing sampled colored image data and thereafter interpolating the sampled colored image data to provide image data in each color sampled for each point or pixel at which the subject is sensed from which an image of the subject may be constructed having reduced color artifacts and fringing while reducing the blurring to the image that would otherwise be required to correct for such artifacts and fringing.

Abstract: Television camera lenses cover a field which is larger than the useful field to be televised. Defects appear in the useful image as a result of diffusion of light from the portion of the image which is not intended to be televised or in other words the peripheral portion. The device for correcting peripheral diffusion comprises scanning and processing means for scanning a band located on the target around the image to be televised and for supplying a diffusion-correcting signal which is representative of a mean value of the band-scanning signals.

Abstract: An automatic gain control (AGC) circuit 30 includes a pulse mixing circuit 31 for mixing a reference pulse P having a specified amplitude in a pedestal of a composite video signal with a sync-tip level of a synchronizing signal clamped. Based on the reference pulse P, keyed AGC operation is performed preferentially and peak AGC operation based on detection of the peak of a video signal V is performed as required. According to the change of reference voltage by a variable resistor VR for setting of an AGC operation level, electric currents I.sub.2 and I.sub.1 flowing in mirror circuits Q.sub.11 and Q.sub.4 change. As a result, the amplitude of the reference pulse P changes in proportion to the change of the reference voltage. Thus, a wide range of effective output gain can be applied.

Abstract: A beam index CRT system includes a pair of memories that are selectively operated to store lines of data from a source and to supply stored lines of data to a CRT. A plurality of NOR gates and flip-flops toggle memory addressing means and simultaneously apply appropriate timing signals thereto for controlling the memory writing and reading operations.

Abstract: In a system in which an information signal is transmitted along with digital data from a transmitter to a receiver, transmitter circuitry is provided which produces digital data indicative of parameters relating to noise reduction for the information signal, and receiver circuitry is provided responsive to the digital data so as to optimize reception of the information signal. In one embodiment of the invention, one of a plurality of different pre-emphasis levels is applied to a signal and digital data is produced according to a value of pre-emphasis added. The digital data and the pre-emphasized signal are then transmitted. The receiver decodes the digital data and adds a corresponding amount of de-emphasis to the received information signal. In another embodiment the digital data indicates an optimum value for a parameter to be applied to a threshold extension demodulator in the receiver.

Abstract: Apparatus and method for processing a raster scan video signal representing an image and detecting the outline of one or more objects in the image represented by the video signal. The steps of the method include encoding the raster scan video signal as a sequence of binary pixel values. For each of a plurality of the pixels the following steps are performed. It is detected when the binary pixel values representing the pixel and a horizontally adjacent pixel are distinct. It is also detected when both (a) the binary pixel values representing the pixel and a vertically adjacent pixel are distinct, and (b) the binary pixel values representing a pixel horizontally adjacent to said pixel and a pixel vertically adjacent thereto are distinct. The position of the pixel is reported when either of the detecting steps detects distinct binary pixel values. The second detecting step automatically eliminates redundant pixel reporting by eliminating the reporting of double diagonal pixels.

Abstract: A color CCD imager with three correlated clamp-sample-and-hold sense amplifiers (one for each color channel). The three control lines necessary to operate this type of amplifier, together with the clock lines necessary for the three shift registers which feed them, are all wired together, so that correct phasing of the three outputs is maintained with only three clock lines.

Abstract: A contrast amplifier for video images comprises means for computing a mean value M.sub.g of luminance of all the points of a field, means consisting of a horizontal filter and a vertical filter for computing a local mean value M.sub.v of luminance in the vicinity of a point being processed and means for multiplying the value of luminance of the point during processing by a variable coefficient which is proportional to the ratio M.sub.v /M.sub.g.

Abstract: A noise reduction circuit for video signal comprises a first stage noise eliminating circuit for practically eliminating a noise component in the video signal, and a second stage noise eliminating circuit for eliminating a noise component remaining in an output of the first stage noise eliminating circuit. A video signal which is obtained from the second stage noise eliminating circuit has also been eliminated of a noise component existing immediately after a rise in the video signal, and the output video signal of the second stage noise eliminating circuit has been substantially eliminated of all the noise component.

Abstract: A TV remote volume control includes an RF input for receiving the video modulated RF carrier and the audio modulated RF carrier, both with common mode spurious deviation. The audio modulated RF carrier is demodulated to provide a baseband audio signal without common mode spurious deviation. The video modulated RF carrier is used to provide a video RF carrier signal with common mode spurious deviation. The baseband audio is volume controlled and the volume controlled baseband audio is then used to provide an audio modulated IF carrier. The volume controlled audio modulated IF carrier is combined with the video carrier with common mode spurious deviation to provide a volume controlled audio modulated RF carrier with common mode spurious deviation.

Abstract: A wide-band single beam index signal system includes a photo multiplier tube supplying a decay compensation circuit for developing an output signal responsive to excitation of index strips by the electron beam of the CRT. The output signal is supplied to a differentiator to determine its zero crossing and supplied to a comparator circuit where an index signal pulse is developed. The timing of the index signal is determined by the zero crossing. Video information is clocked from a computer, on a pixel-by-pixel basis, under control of the index signal. The index signal also controls production of a first index video signal and a second index video signal, depending upon the presence or absence of video information. Means are included for turning off the electron beam between index strips. The output of the differentiator is offset for noise compensation.

Abstract: A remote-controllable automatic diaphragm control device for use with a CCTV camera permitting the diaphragm control to be changed over between an automatic diaphragm control mode in which a desired diaphragm control is achieved by utilizing a video signal supplied from a television camera and a remote diaphragm control mode in which the diaphragm is electrically adjustable to a desired diaphragm position entirely regardless of said video signal from the television camera, in a simple manner.

Abstract: A widescreen television picture is sampled at a higher sampling rate so as to fit all of the information in the current 52.5 .mu.s active video line time. A selection signal is also incorporated with the widescreen picture signal, allowing non-widescreen television receivers to display a contiguous portion of the widescreen picture without geometric distortion. The widescreen television signal is transmitted either in MAC or widescreen NTSC format, and is received by a decoder. The decoder allows the entire widescreen picture to be displayed on a widescreen receiver, and makes use of the selection signal to display the selected portion of the picture on a standard receiver without geometric distortion. In another embodiment, a decoder allows television signals having the standard aspect ratio to be displayed on receivers having widescreen aspect ratios without geometric distortion.

Abstract: A video display system is disclosed, which includes a display device including a plurality of display cells arranged in an X-Y matrix form, a video signal source for supplying a digital video signal, a pulse width modulator connected to the video signal source for deriving a PWM signal corresponding to the brightness level of the digital video signal, the pulse width modulator including a counter supplied with the digital video signal as a datum signal and a clock signal generator for supplying a clock signal to the counter, and a signal supplying circuit connected to the pulse width modulator for supplying the PWM signal to the display device and reproducing a picture thereon. In this case, the video display system of this invention further includes a control circuit connected to the clock signal generator for changing the frequency of the clock signal supplied to the counter and controlling the brightness of the picture reproduced on the display device.

Abstract: A device is provided which is specifically adapted to be removably secured to an eyeglass frame as it is worn by a person. The device can be aimed so that an optic system carried by the device will detect the scene being viewed by the wearer.

Abstract: An iris control circuit for a video camera in which only a single drive coil is employed so that the video camera employing the circuit can be more easily miniaturized. A first operational amplifier supplies drive current to a drive coil in proportion to the sum of an iris control signal and a feedback signal. A detecting circuit, preferably implemented as a voltage divider circuit, detects the counterelectromotive force developed across the drive coil. A feedback circuit, which may be implemented with a second operational amplifier, develops the feedback signal. The feedback signal can be made variable to adjust the feedback ratio, and hence the proportional braking force applied to the iris.