Abstract: A method for the improved reproduction of edges associated with sharp changes in tone density during the engraving of screened printing forms with an engraving tool. The engraving tool is controlled by an engraving signal obtained from superposition of an image signal and a screening signal. The image signal is derived from scanning an original with a resolution which is twice as large in the scanning direction as that of the printing screen. Based on the higher resolution the image signal is digitalized into principal image values and additional intermediate image values. If a sharp change in the density defined as an edge occurs in the original a principal image value and the associated intermediate image values are combined into one memory word after the image values have been recoded into values of shorter word lengths and intermediately stored. If no edge is present in the original only the principal image values are intermediately stored as memory words.
Abstract: An electron-optical lens arrangement for electron beam apparatus having a static and a dynamic focussing lens system, in which the dynamic focussing lens system is situated inside the static focussing lens system.
Abstract: A method of avoiding unwanted line structures in the electronic reproduction of images by means of a monochromatic light source in whose beam path an acousto-optic modulator (AOM) cell is arranged. One line consists of a multiple line made up of a plurality of sub-lines. The acousto-optic modulator (AOM) cell is driven by a mixture of ultrasonic waves of discrete frequencies, by which means the beam is split up into a plurality of sub-beams each associated with a discrete frequency which together determines the line width. The individual frequencies are so calculated that the sub-beams overlap and so that the amplitudes of the frequencies produce a uniform intensity distribution in a line.
Abstract: Apparatus for electro-optically recording picture information comprising a scanning a picture with a head having multiple electrical optical scanning devices which can be simultaneously moved across the picture and wherein the output of the scanning devices are applied to two storage devices and the scanning device is passed laterally across a picture and then advanced at right angles to the scanning motion and then the scanning head is scanned back across the picture in the opposite direction to the first scan during which time the information from the scanning head is stored in a second plurality of memories. Means for transmitting and recording the information are also provided.
Abstract: The method of electro-optically scanning a picture with a multiple electrical optical scanning head which can be laterally moved across the picture and the outputs of the multiple scanning head are supplied to a first group of shift registers so that individual lines of scanned information will be stored in individual shift registers. After the k lines of information have been scanned and stored in the first group of shift registers the scanning element is shifted to scan additional lines and the output of the multiple scanning device is supplied to a second plurality of shift registers to store information in this group of lines. When information is being written in the second group of shift registers the first group of shift registers are connected to a transmitter to serially transmit line by line the stored information.
Abstract: A facsimile scanning method for converting a video signal obtained by opto-electronic scanning of an original into a two-level signal suitable for transmission.A first companion signal is first generated which lies essentially above the video signal and which follows the video signal when it rises but when the video signal declines remains at the voltage reached when the video signal was at a maximum until a difference value between the first companion signal and a reference signal is reached, which then comes close to the declining video signal until the difference value is reached, which remains at the voltage value then reached until the first companion coincides with the video signal, and which then follows the rising video signal.At the same time a second companion signal is generated which lies substantially below the video signal and which progresses accordingly. From the first and second companion signals is derived a threshold signal which follows the video signal dynamically.
Abstract: A method and apparatus for recording graphic or image information by means of punctiform recording spots which are arranged line-by-line according to a recording grid, or multi-lined within a matrix, whereby at the beginning of a contour proceeding obliquely to the recording direction, the first recording spot is displaced in the direction of the contour when its edge does not coincide with the contour and, in order to improve the end edge of such a contour proceeding obliquely to the recording direction, the recording of the last recording spot may be additionally displaced relative to the preceding recording spot by a retarding in time of the recording of said last spot.
Abstract: Apparatus and method for producing image combinations in which the image to be copied are digitally stored and a mask is produced for manually superimposing the images with each other with one of the images and the mask being scanned and wherein the coordinates of the image which is to be transferred into the other image are measured as x and y values and the two images are combined by utilizing the x and y values to form a composite total image.
Abstract: A regulation device for controlling the level of a signal having a controllable amplification, the signal fluctuating in amplitude, includes a signal control device, first and second threshold stages postcoupled to the signal control device having first and second thresholds, respectively, which thresholds define a predetermined signal range, and an element chargeable and dischargeable to first and second potentials, respectively, postcoupled to the threshold device, and connected by feedback to the signal control device for controlling its amplification within the predetermined range.
Abstract: Apparatus and method for improving the picture quality during transmission of facsimile signals which have an image signal having a signal of a particular polarity but has an minimum amplitude to represent a first information state such as white and a maximum amplitude to represent a second information state such as black whereby due to changes of information of the signal inverter pulses are obtained for the formation of a signal of changed polarity such that the change in polarity represents an information state and the zero position represents the second information state.
Abstract: A process of obtaining digital data for color components of a color image includes the steps of quantizing color-processor derived signals to obtain first and second raster signal scans, wherein each of the raster signal scans has a multiplicity of raster spots spaced apart from one another at first and second predetermined distances. The first and second distances of the first raster signal scan correspond substantially to the second and first distances of the second raster signal scan, respectively. Only the raster signal scans corresponding to the color-processor obtained signals in the first and second memory segments, respectively, are stored.
Abstract: Apparatus and method for color correction in the manufacture of printing forms which uses a correction circuit to determine correction parameters that are stored and then used in a correcting circuit for the color correction process and wherein the determination and correction are separate processes and in which in the correction circuits there are arranged a regulating unit controlled by digital values in the path of each the signal to be corrected and that the regulating units can be adjusted for determination of the correction parameters to digital values so as to obtain the desired correction and which are then stored in a storage medium from which they can be transferred in at least one correction circuit for a subsequent color correction process.
Type:
Grant
Filed:
June 2, 1978
Date of Patent:
May 20, 1980
Assignee:
Dr. Ing. Rudolf Hell GmbH
Inventors:
Uwe Gast, Dennis Kiralfy, Klaus Schaefer, Eckhard Slawik, Klaus Wellendorf
Abstract: A method and apparatus for electro-optically scanning a picture with a head having multiple electrical optical scanning devices which can be simultaneously moved across the picture and wherein the output of such scanning devices are alternately supplied to storage or memory devices which convert the information from the scanning devices into series arranged information corresponding to each scanning device and wherein during the time that the scanning devices are scanning certain portions of the picture and supplying information to a first set of storage or memory devices, information from a second group of storage or memory devices is being read out to a transmitter for transferring the data to a second location. The invention and method further include a receiver for receiving such information and includes a pair of plurality of storage devices one of which is receiving the incoming information and the other is supplying previously stored information to scanning writing heads.
Abstract: Method and apparatus for electro-optically recording picture information comprising scanning a picture with a head having multiple electrical optical scanning devices which can be simultaneously moved across the picture and wherein the output of such scanning devices are in a time sequential manner applied to storage devices as, for example, shift registers wherein such information can be converted into series information associated with each of the scanning devices in the head and further including a second plurality of storage devices in the form of shift registers in which information can be stored at a time when information is being read out of the first plurality of shift registers.
Abstract: Apparatus including a circuit arrangement for recognizing colors in which a scanning device scans a colored area and obtains color signal values forming the coordinates of the color locations in a color space and wherein the color selection circuit produces an output signal when the color location assigned to a color scanned lies within a color recognition space and the invention consists of utilizing several differential steps for each color channel so as to form differential voltages from the color signal values and from reference signals and wherein the different signal values are combined and superimposed to obtain a resulting signal with the aid of an adjustable compensation voltage.
Abstract: In a device for producing corrected color chromatic components for multicoloring printing in which an original is scanned and displayed on a color monitor in which different color components are supplied to comparators for each color channel and in the comparators the color signals are respectively compared with upper and lower thresholds such that the colors which exceed or fall below the threshold values are indicated so that color corrections may be made.
Abstract: In a device for producing corrected color chromatic components for multicoloring printing in which an original is scanned and recorded and selectively displayed on a television monitor in which a switching arrangement is provided for producing an one-color frame which surrounds the color picture on the picture screen so as to allow improved color corrections to be made.
Abstract: Method and apparatus for locally precisely setting the start and end of the reproduction of an image pattern wherein a first signal is produced by scanning a starting mark which determines the desired scanning start on the image pattern and a second signal "scanning start" is obtained from a circumferential impulse from the cylinders by means of an alterable time delay and that in order to set the scanning start on the image pattern for later reproduction the signals are brought into coincidence by altering the time delay during a test run with the aid of a comparator during the period when the signal "scanning start" occurs.
Abstract: A recording device for use in electrostatic reproduction of an image on a recording medium includes a support, two carrier plates juxtaposed relative to each other on the support, covers for the carrier plates, a row of electrodes near one side of each carrier plate, supply leads for the electrodes near each carrier plate on its other side, a plurality of counter electrodes spaced apart from the electrodes, and an insulating layer between the carrier plates. The electrodes and counter electrodes define a gap adapted for the passage of the recording medium.
Type:
Grant
Filed:
October 26, 1977
Date of Patent:
August 7, 1979
Assignee:
Firma Dr. -Ing. Rudolf Hell GmbH
Inventors:
Rolf Angelbeck, Reinhard Gesell, Rudiger Sommer
Abstract: An arrangement for the recording of rastered half tone pictures, in which each covering dot is formed in a raster field, with the size of the dot being dependent upon the light directed on different portions of the raster field, by a plurality of individual light beams coordinated in a line and focused on the recording medium by objective lens means, in which an optical element is disposed in the beam path to such objective lens means to refract light in the direction of said line, with such optical element occupying approximately half of the total projection cross section of all of the component light beams, and with the boundary of the projection cross section extending transversely to said line direction of the light beams.