EP 0115546 B1 19910925 - AUTOMATIC PRINT QUALITY ASSESSMENT AND ADJUSTMENT OF A PRINTER
Title (en)
AUTOMATIC PRINT QUALITY ASSESSMENT AND ADJUSTMENT OF A PRINTER
Publication
Application
Priority
EP 83100692 A 19830126
Abstract (en)
[origin: EP0115546A1] A computer-controlled method for automatically determining the respective value of the print quality of a printer and for adjusting said print quality towards an optimum value DQopt using the empirically determined average optimum image contrast signal (PCS) as well as the standard deviation sigma of PCS which results from the equation <IMAGE> where RB = reflection of the background and Ri = reflection of an image element i or point i (PEL). The method is characterised in that by optoelectronic scanning of all image elements i of a character along the skeleton line and the background, the actual value of the image contrast signal is formed from the individual values <IMAGE> for all n image elements and, from these n scanning values, a factor <IMAGE> is derived and a print quality factor <IMAGE> and from it 1n x2 is formed, in that subsequently the actual value of print quality DQ = a0 + a1 1n x2 is determined from that value, and in that by iterative automatic comparison between the stored optimum value DQopt of the print quality and the value determined for the print quality in a closed control loop, the control factors for readjusting the different parameters of the printer are derived and used.
IPC 1-7
IPC 8 full level
B41J 2/30 (2006.01); B41F 33/00 (2006.01); B41F 33/14 (2006.01); B41J 7/92 (2006.01); B41J 7/96 (2006.01); B41J 29/46 (2006.01); G05B 11/36 (2006.01); G06F 3/12 (2006.01); G06K 15/00 (2006.01); G06T 1/00 (2006.01); H04N 1/23 (2006.01)
CPC (source: EP)
B41F 33/0036 (2013.01); B41J 7/96 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0115546 A1 19840815; EP 0115546 B1 19910925; CA 1204880 A 19860520; DE 3382418 D1 19911031; JP S59138457 A 19840808
DOCDB simple family (application)
EP 83100692 A 19830126; CA 441818 A 19831124; DE 3382418 T 19830126; JP 22339083 A 19831129