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1. WO1996005967 - THINNED HALFTONE DOT PATTERNS FOR INKJET PRINTING

Publication Number WO/1996/005967
Publication Date 29.02.1996
International Application No. PCT/US1995/008406
International Filing Date 05.07.1995
Chapter 2 Demand Filed 30.01.1996
IPC
B41J 2/21 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
2Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
005characterised by bringing liquid or particles selectively into contact with a printing material
01Ink jet
21for multi-colour printing
CPC
B41J 2/2132
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, ; e.g. INK-JET PRINTERS, THERMAL PRINTERS; , i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
2Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
005characterised by bringing liquid or particles selectively into contact with a printing material
01Ink jet
21for multi-colour printing
2132Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
G06K 15/102
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
15Arrangements for producing a permanent visual presentation of the output data ; , e.g. computer output printers
02using printers
10by matrix printers
102using ink jet print heads
H04N 1/405
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
1Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
40Picture signal circuits
405Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
Applicants
  • MINNESOTA MINING AND MANUFACTURING COMPANY [US]/[US]
Inventors
  • RYLANDER, Richard, L.
Agents
  • SHUMAKER, Steven, J.
  • VOSSIUS & PARTNER
Priority Data
08/295,60325.08.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) THINNED HALFTONE DOT PATTERNS FOR INKJET PRINTING
(FR) MOTIFS DE POINTS DE TRAME AMINCIS POUR IMPRESSION A JET D'ENCRE
Abstract
(EN)
A set of thinned halftone dot patterns (42) useful in inkjet printing comprises a plurality of halftone cells (40) corresponding to respective shade values. Each of the halftone cells includes a plurality of addressable points (12, 14), with at least some of the points being turned 'on' (14) to define a halftone dot pattern (46), and at least some of the 'on' points (14) defining a core component of the halftone dot pattern being selectively turned 'of' (44), thereby producing a thinned halftone dot pattern (42). The thinned halftone dot patterns enable the use of higher addressability in an inkjet printing system to achieve a wider range of shade values while avoiding undesirable over-inking of printed halftone dot patterns due to excessive overlap (26) between printed ink spots (24). The thinned halftone dot patterns prevent significant overlap between adjacent ink spots in the core, or 'interior', component when the halftone dot pattern is printed by the inkjet printing system, but preserves the entire edge component to maintain desired halftone cell definition. Thinned halftone cells can be stored in a memory as 'glyphs' and retrieved by an inkjet printing system to print higher addressability halftone images with enhanced quality and a wider range of shade values.
(FR)
Un ensemble de motifs de points de trame amincis (42) utiles dans l'impression à jet d'encre comprend un ensemble de cellules à demi-teintes (40) correspondant à des valeurs de nuances respectives. Chacune des cellules à demi-teintes comprend un ensemble de points adressables (12, 14), dont au moins quelques-uns sont 'allumés' (14) pour définir un motif de points de trame (46), au moins quelques-uns des points 'allumés' (114) qui définissent une partie de coeur du motif de points de trame étant 'éteints' sélectivement (44), de manière à produire un motif de points de trame amincis (42). Ces motifs de points de trame amincis améliorent les capacités d'adressage dans un système d'impression à jet d'encre, afin d'élargir la gamme des valeurs de nuances tout en évitant un encrage excessif indésirable des motifs de points de trame imprimés résultant du chevauchement excessif (26) entre les points d'encre appliqués (24). Ces motifs de points de trame amincis empêchent tout chevauchement important entre des points d'encre adjacents dans la partie de coeur, ou 'interne', lors de l'impression du motif de points de trame par le système d'impression à jet d'encre, mais préserve dans sa totalité la partie de bordure afin de maintenir la définition souhaitée des cellules à demi-teintes. Les cellules à demi-teintes amincies peuvent être stockées en mémoire sous forme de 'glyphes' et extraites par les système d'impression afin d'améliorer la qualité d'impression des images à demi-teintes par un adressage plus précis et l'élargissement de la gamme des valeurs de nuances.
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