Global Patent Index - EP 1066716 A1

EP 1066716 A1 2001-01-10 - HALFTONING WITH PRE-COMPUTED MAPS

Title (en)

HALFTONING WITH PRE-COMPUTED MAPS

Title (de)

HALBTONRASTERUNG MIT VORAUSBERECHNETEN ABBILDUNGEN

Title (fr)

CREATION DE DEMI-TONS AVEC DES CARTES ETABLIES PAR DES CALCULS PRELIMINAIRES

Publication

EP 1066716 A1 (EN)

Application

EP 99908033 A

Priority

  • SE 9900282 W
  • SE 9800686 A

Abstract (en)

[origin: WO9945697A1] Halftoning method based on the use of pre-computed maps, one for each possible tone value in the image, at halftoning the image value at a specific position gives the map from which a pixel is copied into the halftone at the corresponding position. The maps with low or high densities have maximally spread minority dots but in intermediate maps a successive transition takes place from maximally spread dots to structured dot clusters of defined type for instance straight lines.

IPC 1-7 (main, further and additional classification)

H04N 1/40

IPC 8 full level (invention and additional information)

H04N 1/405 (2006.01)

CPC (invention and additional information)

H04N 1/4051 (2013.01)

Citation (search report)

See references of WO 9945697A1

Designated contracting state (EPC)

DE FR GB IT NL

EPO simple patent family

WO 9945697 A1 19990910; EP 1066716 A1 20010110; SE 513365 C2 20000904; SE 9800686 D0 19980305; SE 9800686 L 19990906

INPADOC legal status


2004-04-07 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20031001

2001-01-10 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20001005

2001-01-10 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB IT NL