Precise method for measuring the edge acuity of electronically (digitally) printed hard-copy images

William White

doi:10.1117/12.47777

1 April 1991 Precise method for measuring the edge acuity of electronically (digitally) printed hard-copy images

William White

Proceedings Volume 1398, CAN-AM Eastern '90; (1991) https://doi.org/10.1117/12.47777
Event: CAN-AM Eastern '90: 1st Canadian-American Eastern Regional Conference on Applications of Optical Engineering, 1990, Rochester, NY, United States

Abstract

Sirke dre are very clear differences between analog (imp arid digital (non-impat) printed images there has been severe difficuky withdefining the quality ofdigital images in analog terms. The three optical tharteristIcs which fine digital to images are: edge acuiiy density J shape factor which edge is the most significart. 11 method ofpIying a scale of" lines r centimeter (inch)" common in analog image tectuiology will not work with dgital image chnsques. Examinion and statistical survey of over 3 toner-output pages from a varty of dIgital electronic printing cliiohgis ty means of SEM microspectrophotometry and optical microscopic analyses indicated a urse tharristic concerning the edge uity. 11 " spreaf or " satelliting" of the tonor defined a ictaIjIe patm in etch case. ''flk difference or ''ra between th edges of the addressed (electrophotographie or ekctrogr letter form and the actual resolved (tonered) edges can be quantified. This da was used as the basis of a serrs of micro-optical comparors for fining aii measuring the separation between the two edges (*kessable) as (resolvthle) preely. 11 results constitute not only a precise method of measuring edge acuity but a possible standard which may be applied to all electronic printing tectuiologies. I. ANALOG AND DIGITAL IMAGES COMPARED. The specific differences in optical characteristics between analog (Inpact) printed images and digital (non-impact) priiied isnages can be seen ii the companion in Illuatrationi 1 and 2. In

Citation Download Citation

William White "Precise method for measuring the edge acuity of electronically (digitally) printed hard-copy images", Proc. SPIE 1398, CAN-AM Eastern '90, (1 April 1991); https://doi.org/10.1117/12.47777

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