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Proceedings Paper

Precise method for measuring the edge acuity of electronically (digitally) printed hard-copy images
Author(s): William White
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Paper 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

Paper Details

Date Published: 1 April 1991
PDF: 5 pages
Proc. SPIE 1398, CAN-AM Eastern '90, (1 April 1991); doi: 10.1117/12.47777
Show Author Affiliations
William White, NiTech Research Corp. (United States)

Published in SPIE Proceedings Vol. 1398:
CAN-AM Eastern '90

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