B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
354/236.1
B41J 7/96 (2006.01) B41F 33/00 (2006.01) B41J 3/10 (1985.01)
Patent
CA 1204880
METHOD OF AUTOMATICALLY DETERMINING AND CONTROLLING THE PRINT QUALITY OF A PRINTER Abstract The invention concerns a computer-controlled method of automatically determining the print quality value of a printer and of controlling the print quality value towards an optimum value DQopt, using both the empirically determined average optimum image contrast signal (PCS) and the standard deviation ? PCS. the average optimum image contrast signal is derived from the relation Image where RB is the reflection of the background and Ri is the reflection of a picture element or dot i (PEL). The actual value of the image contrast signal is derived from the individual values PCS = Image for all n picture by optoelectronically scanning all picture elements i of a character along the skeleton line and the background, and deriving from these scanning values a factor Image and a print quality factor Image and deriving ln x2 from said print quality factor. Subsequently the actual print quality value DQ = aO + a1 ? ln x2 is determined, and by iterative automatic comparison of the stored optimum print quality value DCopt and the print quality thus determined, control variables are derived and used in a closed control loop for adjusting the different printer parameters.
441818
International Business Machines Corporation
Rosen Arnold
LandOfFree
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