EP0115546B1 - Méthode pour déterminer et ajuster automatiquement la qualité d'impression d'une imprimante - Google Patents

Méthode pour déterminer et ajuster automatiquement la qualité d'impression d'une imprimante Download PDF

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Publication number
EP0115546B1
EP0115546B1 EP19830100692 EP83100692A EP0115546B1 EP 0115546 B1 EP0115546 B1 EP 0115546B1 EP 19830100692 EP19830100692 EP 19830100692 EP 83100692 A EP83100692 A EP 83100692A EP 0115546 B1 EP0115546 B1 EP 0115546B1
Authority
EP
European Patent Office
Prior art keywords
value
print quality
subjective
pcs
printer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19830100692
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German (de)
English (en)
Other versions
EP0115546A1 (fr
Inventor
Werner Dipl.-Ing. Ruppert
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.)
IBM Deutschland GmbH
International Business Machines Corp
Original Assignee
IBM Deutschland GmbH
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Application filed by IBM Deutschland GmbH, International Business Machines Corp filed Critical IBM Deutschland GmbH
Priority to DE8383100692T priority Critical patent/DE3382418D1/de
Priority to EP19830100692 priority patent/EP0115546B1/fr
Priority to CA000441818A priority patent/CA1204880A/fr
Priority to JP58223390A priority patent/JPS59138457A/ja
Publication of EP0115546A1 publication Critical patent/EP0115546A1/fr
Application granted granted Critical
Publication of EP0115546B1 publication Critical patent/EP0115546B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J7/00—Type-selecting or type-actuating mechanisms
    • B41J7/96—Means checking correctness of setting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control

Definitions

  • the invention relates to a method for regulating the print quality of characters printed out by printers.
  • the optical color density would be a criterion for assessing the print quality; however, it is not the print quality that appears as the control variable, but only the optical density.
  • the print quality is a subjective variable and can be determined empirically from a statistically relevant number of individual assessments of a number of equally good or of gradually or continuously increasing (or also decreasing) templates by a likewise statistically relevant number of observers. In this way, as detailed tests have shown in good agreement with one another, one can actually come to a reasonably reliable statement about the print quality, especially if one categorizes the results into a number of graded quality classes, for example six quality classes.
  • the new method is intended to constantly monitor and, if necessary, correct the print image of a line printer, raster printer or the like.
  • the control of the hammer flight time is incorrect or the type carrier moves too quickly or too slowly, the hammer is triggered too early or too late.
  • Unclear or too strong pressure can indicate that the stop of the print hammer or printhead is too strong or too weak, for example.
  • This can also be an indication that the ink ribbon or blanket is brand new or, on the contrary, has been used up so much that the structure of the ink ribbon or ink can be seen in the print.
  • a medium print quality will be specified, which still has to be described as very good, and attempts will be made to adjust to this medium print quality, which is certainly the optimum for long-term operation.
  • a representative set of print templates which may be of the same and / or different quality, is submitted to an equally representative group of evaluators for assessment.
  • the evaluators are asked to rate the quality with a factor between 1 and 6 with the possibility of intermediate values 1.5, 2.5, etc.
  • These assessments are evaluated using statistical procedures. This results in a formula which allows the assessments to be mathematically predicted with sufficient accuracy if the corresponding print quality parameters have been determined by measurement.
  • One of these parameters is the Print Contrast Signal (PCS). This is determined along the skeleton line in accordance with DIN 66 223 and also over the template background by scanning using the above-mentioned scanning method. This parameter results from the different reflection values of the skeleton line to the background.
  • PCS Print Contrast Signal
  • the value (1- PCS defects ) can also be called the completeness of a character as an average value.
  • This x2 value can be linearized using the natural log and then you get a linear scale of 1-6. An extrapolation to values less than 1 and greater than 6 is then possible. In most cases, the completeness of the characters is ensured; so that the formula for x2 simplifies too This always applies along the skeleton line.
  • This formula can be used for all print templates in which the print contrast, the fluctuations in the print contrast along the skeleton line, the fluctuations in the print contrast between different characters and the completeness of the individual characters as well as the edge sharpness of the individual characters are the essential components for the print quality factor.
  • the control process runs in such a way that the parameters accessible in the printer of a control system are stored in a list memory and that the control variables effect the readjustments of the individual parameters, which are subordinate to their efficiency, one after the other until the optimum print quality is achieved by constant comparison with the stored value is approximated or reached.
  • the sampled values can be obtained either from the characters of a print line itself or from special characters to be printed outside the typeface, which are particularly suitable for precise adjustment to the optimal print quality.
  • These patterns can be, for example, dot grids, line grids, or grids with only one dot or grids with concentric circles or the like.
  • the scanned values are expediently recorded with a photoelectronic scanner mounted directly above the print line in a very small space and the print quality factor DQ is derived using a simple arithmetic circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Image Analysis (AREA)
  • Image Processing (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Feedback Control In General (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Electronic Switches (AREA)

Claims (2)

  1. Procédé pour régler la qualité d'impression de caractères imprimés par des imprimantes, caractérisé en ce qu'un estimateur humain (jury) évalue la qualité subjective d'impression sur la base d'une impression subjective au moyen de valeurs chiffrées (par exemple 1 = la meilleure; 1,5; 2; ... 6 = la plus mauvaise), que pour une imprimante particulière, la qualité subjective d'impression requise est mémorisée dans l'imprimante en étant prédéterminée au moyen d'une certaine valeur chiffrée DQs, que pour un caractère imprimé, une valeur du signal de contraste d'image
    Figure imgb0017
     (Ri = coefficient de réflexion du i-ème élément d'image,
    RB = coefficient de réflexion du fond)
    est déterminée de façon connue en soi pour un caractère imprimé, au moyen d'une exploration opto-électronique de chacun des éléments d'images i (i= 1 à n) du caractère, le long de la ligne de contour de ce dernier, et du fond et que la moyenne arithmétique PCS est déterminée à partir de toutes les valeurs du signal de contraste d'image du caractère et qu'une valeur objective de la qualité d'impression indiquée par

    DQ o = a o + a₁ lnx₂
    Figure imgb0018

    (ao ≧ valeur chiffrée la plus mauvaise et a₁ choisi (en tant que valeur négative) de manière à obtenir la meilleure valeur chiffrée pour la meilleure qualité d'impression pour DQo)
    est déterminé à partir des valeurs du signal de contraste d'image moyennant la formation de l'écart-type
    Figure imgb0019
     et la détermination d'un facteur de qualité d'impression
    Figure imgb0020
     et que dans le cas d'un écart entre la valeur objective DQo de la qualité d'impression et la valeur subjective prédéterminée DQs de la qualité d'impression, un ajustement de la valeur DQo sur la valeur DQs est réalisé de telle sorte que les grandeurs influençant la qualité objective d'impression de l'imprimante sont modifiées de façon correspondante.
  2. Procédé selon la revendication 1, caractérisé en ce que dans le cas de défauts dans la ligne de contour du caractère devant être déterminé, une valeur moyenne normalisée de défaut PCS correspondant à
    PCS défaut
    est déterminée en tant que pourcentage des éléments d'image défectueux par rapport à tous les éléments d'image requis, et
    que le facteur de qualité d'impression est calculé en tenant compte des défauts, conformément à
    Figure imgb0021
EP19830100692 1983-01-26 1983-01-26 Méthode pour déterminer et ajuster automatiquement la qualité d'impression d'une imprimante Expired - Lifetime EP0115546B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE8383100692T DE3382418D1 (de) 1983-01-26 1983-01-26 Verfahren zum automatischen ermitteln und einregeln der druckqualitaet eines druckers.
EP19830100692 EP0115546B1 (fr) 1983-01-26 1983-01-26 Méthode pour déterminer et ajuster automatiquement la qualité d'impression d'une imprimante
CA000441818A CA1204880A (fr) 1983-01-26 1983-11-24 Methode de determination et de controle automatiques de la qualite d'impression d'un imprimante
JP58223390A JPS59138457A (ja) 1983-01-26 1983-11-29 印刷品質値測定制御方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19830100692 EP0115546B1 (fr) 1983-01-26 1983-01-26 Méthode pour déterminer et ajuster automatiquement la qualité d'impression d'une imprimante

Publications (2)

Publication Number Publication Date
EP0115546A1 EP0115546A1 (fr) 1984-08-15
EP0115546B1 true EP0115546B1 (fr) 1991-09-25

Family

ID=8190262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830100692 Expired - Lifetime EP0115546B1 (fr) 1983-01-26 1983-01-26 Méthode pour déterminer et ajuster automatiquement la qualité d'impression d'une imprimante

Country Status (4)

Country Link
EP (1) EP0115546B1 (fr)
JP (1) JPS59138457A (fr)
CA (1) CA1204880A (fr)
DE (1) DE3382418D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1226948A (fr) * 1984-04-13 1987-09-15 Tohru Ozaki Dispositif pour evaluer la densite et l'uniformite de motifs imprimes
DE4142481A1 (de) * 1991-08-12 1993-02-18 Koenig & Bauer Ag Qualitaetskontrolle einer bildvorlage z. b. eines gedruckten musters
EP0772145A3 (fr) * 1995-11-06 1999-02-24 JOHNSON & QUIN, INC. Système et méthode pour déterminer la qualité de matière imprimée

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2727227A1 (de) * 1977-06-16 1978-12-21 Heidelberger Druckmasch Ag Einrichtung zur qualitaetssicherung von druckerzeugnissen
DE2727426B2 (de) * 1977-06-18 1981-04-30 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Vorrichtung zum Steuern der Farbzuführung einer Bogen-Offsetdruckmaschine

Also Published As

Publication number Publication date
CA1204880A (fr) 1986-05-20
EP0115546A1 (fr) 1984-08-15
JPS59138457A (ja) 1984-08-08
DE3382418D1 (de) 1991-10-31

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