US3626161A - Method of producing a character or pattern original for use in quantizing a character or pattern and obtaining digital data therefrom by photoelectrical scanning - Google Patents

Method of producing a character or pattern original for use in quantizing a character or pattern and obtaining digital data therefrom by photoelectrical scanning Download PDF

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Publication number
US3626161A
US3626161A US774767A US3626161DA US3626161A US 3626161 A US3626161 A US 3626161A US 774767 A US774767 A US 774767A US 3626161D A US3626161D A US 3626161DA US 3626161 A US3626161 A US 3626161A
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United States
Prior art keywords
character
pattern
raster
lines
original
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Expired - Lifetime
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US774767A
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English (en)
Inventor
Roman Koll
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dr-Ing Rudolf Hell Kg
HELL RUDOLF DR ING KG
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HELL RUDOLF DR ING KG
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Publication date
Priority claimed from DE19671597775 external-priority patent/DE1597775C/de
Application filed by HELL RUDOLF DR ING KG filed Critical HELL RUDOLF DR ING KG
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Publication of US3626161A publication Critical patent/US3626161A/en
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41B—MACHINES OR ACCESSORIES FOR MAKING, SETTING, OR DISTRIBUTING TYPE; TYPE; PHOTOGRAPHIC OR PHOTOELECTRIC COMPOSING DEVICES
    • B41B19/00—Photoelectronic composing machines
    • B41B19/01—Photoelectronic composing machines having electron-beam tubes producing an image of at least one character which is photographed

Definitions

  • the invention is directed to a method for producing a character or pattern original which is to be photoelectrically scanned for the purpose of quantizing the character or pattern represented thereby and obtaining digital data therefrom.
  • a quantization and digitalization of a character or pattern is necessary, in particular, for the purpose of controlling highspeed phototype setters which utilize raster techniques.
  • each character to be set is formed on the screen of a cathode ray tube by suitable control of the electron beam thereof, as a plurality of closely adjacent vertical picture lines and the luminous image thus produced is simultaneously projected on a photosensitive layer.
  • the control information necessary for this purpose is stored as digital data, for example, in a ring core matrix and is recalled according to a prescribed setting program from which it is ultimately reconverted into analog values.
  • the invention is directed to a method whereby the production of such originals may be effected considerably more simply and quickly. This is accomplished by applying the initial character or pattern representation, form which the final original is to be derived, to a separate transparent or translucent film, and securing the film, with the surface carrying the applied character or pattern uppermost, in such a position on the original carrier that as many as possible of the vertical and horizontal straightedge lines of the character or pattern representation coincide with corresponding raster lines and as many as possible of its curvilinear edge lines touch raster lines, and thereafter eliminating deviations still existing between edge lines and raster lines by filling in the spaces or removing the part of the character or pattern representation projecting beyond the raster line, making such selection on the basis of which would result in the smallest possible change in shape of the character or pattern.
  • the final original thus results in effect, from conforming edge portions of the character or pattern representation to the raster grid in such a manner that the vertical and horizontal straightedge lines thereof coincide with corresponding raster lines and that any curvilinear edge lines are so disposed that a raster line is tangent thereto.
  • the transparent or translucent film with the applied material forming the character or pattern representation may take the form of a photographic diapositive (transparency).
  • the photographic diapositive may be produced by photomechanically enlarging a print thereof.
  • the production of the original may be further simplified by severing the film at suitable locations on the character or pattern and each individual piece adapted per se to the corresponding raster lines, mutually displacing the pieces by an amount necessary for the adaptation, and if this is accomplished by separation of the pieces, subsequently filling in any space left as a result thereof.
  • the character or pattern representation contains edge lines converging at acute angles, far too great a filling or rounding of the acute angle may occur in the reproduced character or pattern due to the efiective operational diameter of the scanning beam.
  • this may be avoided by so widening the acute angle formed by the edge lines that the divergence includes the surface area of at least a whole raster field.
  • the character d" is carried on the upper face of a transparent sheet or film 2, which is secured to the original sheet 1, provided with a raster line grid, with the character being so disposed on the original sheet that each vertical and horizontal edge line coincides exactly with a corresponding vertical or horizontal raster line.
  • Curvilinear edge lines are so disposed that respective vertical or horizontal raster lines form in each case the tangent to a curvilinear edge line.
  • the film is shifted with respect to the original sheet to dispose one of the vertical and one of the horizontal edge lines in coincidence with corresponding raster lines.
  • edge lines are adapted to the raster line lying closest thereto, namely by scraping away the layer of material forming the character or by filling the surface between edge line and raster line, as may be necessary or desirable.
  • Preliminary adaptation may also be achieved by cutting the film into individual pieces, as indicated by the dashed and dotted lines 3 and 4, and suitable mutually displacing the respective pieces whereby the desired edge alignment may be accomplished. In this operation, the respective pieces may be moved either to overlap one another or separated from one another and obviously in the latter case the resulting gap must be subsequently filled.
  • the acute angle formed thereby may be broadened to the corresponding dimension of a raster field, as a raster field having more than half its area occupied would, during scanning, be considered and treated as being completely covered, whereby such angle would appear to be completely filled or rounded when reproduced from a recording of the character.
  • Suitable symbols such as the blocks 7 of varying sizes appearing at the left edge of the original represent coded information pertaining to the type of script, height and width of the character as well as control signals for use in connection with the storage operations and are so disposed that they will be scanned prior to the scanning of the character.
  • the scanning beam vertically traverses the original from left to right, the first elements to be scanned will be the code symbols.
  • a character or pattern original which is to be photoelectrically scanned for the purpose of quantizing such a character or pattern and for obtaining digital data therefrom, in which the original carrier has a raster line grid, comprising a film, the light transmission characteristics through which is sufficient to enable viewing of the grid therethrough, and the upper surface of which carries a representation of the character or pattern involved, said film being secured to the original carrier with such character or pattern representation being of a size and so disposed on the original carrier that all vertical and horizontal straight edge lines if any of such character or pattern representation coincide with corresponding raster lines and its characteristic curvilinear insert as a result of conformation of edge lines if any touch raster lines tangentially the character or pattern thereto by a corresponding shifting of respective edge lines, retaining curvilinear configuration of any such curvilinear edge lines said original carrier having disposed thereon coded information in scannable form relating to the type, height and width of the character as well as coded control signals for use in the storage of the digital data to be obtained
  • a method according to claim 2 comprising forming a photographic diapositive as the film carrying the character or pattern representation 4.
  • a method according to claim 2 comprising the additional steps of dividing the film at predetermined places on such character or pattern representation and shifting the respective pieces as required to individually adapt the respective pieces to the raster line, with the pieces being mutually displaced by an amount necessary for adaptation and filling any spaces resulting therefrom.
  • a method according to claim 4 comprising the further step of removing part of the character or pattern representation at an acute angle formed by acutely converging edge lines to the area of at least a whole raster grid space.
  • a method according to claim 2 comprising the further step of applying to the original coded information in scannable form relating to the type, height and width of the character as well as coded control signals for use in the storage of the digital data to be obtained, so positioning said coded information on the original with respect to the advanced direction of the intended scanning that scanning of such coded information will precede the scanning of the character or pattern carried thereby.

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US774767A 1967-11-29 1968-11-12 Method of producing a character or pattern original for use in quantizing a character or pattern and obtaining digital data therefrom by photoelectrical scanning Expired - Lifetime US3626161A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671597775 DE1597775C (de) 1967-11-29 1967-11-29 Verfahren zum Aufbereiten graphischer Schriftzeichen oder Bildmuster für photoelektrische Abtastung nach Rasterlinien einer Unterlage zur Quantisierung und Gewinnung digitaler Daten der Schriftzeichen oder Bildmuster

Publications (1)

Publication Number Publication Date
US3626161A true US3626161A (en) 1971-12-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
US774767A Expired - Lifetime US3626161A (en) 1967-11-29 1968-11-12 Method of producing a character or pattern original for use in quantizing a character or pattern and obtaining digital data therefrom by photoelectrical scanning

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Country Link
US (1) US3626161A (enrdf_load_stackoverflow)
FR (1) FR1599061A (enrdf_load_stackoverflow)
GB (1) GB1250213A (enrdf_load_stackoverflow)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1336040A (en) * 1916-12-11 1920-04-06 American Optical Corp Lens-testing instrument
US1777144A (en) * 1928-04-27 1930-09-30 James E Innes Method of lettering
US2124906A (en) * 1937-06-04 1938-07-26 Ibm Statistical machine
US3034643A (en) * 1959-08-13 1962-05-15 Itek Corp Data processing for edge coded cards
US3305841A (en) * 1963-09-30 1967-02-21 Alphanumeric Inc Pattern generator
US3480764A (en) * 1968-06-24 1969-11-25 Roger D Marshall Optical coincidence information retrieval system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1336040A (en) * 1916-12-11 1920-04-06 American Optical Corp Lens-testing instrument
US1777144A (en) * 1928-04-27 1930-09-30 James E Innes Method of lettering
US2124906A (en) * 1937-06-04 1938-07-26 Ibm Statistical machine
US3034643A (en) * 1959-08-13 1962-05-15 Itek Corp Data processing for edge coded cards
US3305841A (en) * 1963-09-30 1967-02-21 Alphanumeric Inc Pattern generator
US3480764A (en) * 1968-06-24 1969-11-25 Roger D Marshall Optical coincidence information retrieval system

Also Published As

Publication number Publication date
GB1250213A (enrdf_load_stackoverflow) 1971-10-20
FR1599061A (enrdf_load_stackoverflow) 1970-07-15

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