Patent ID: 7543911

Claim:
A method for measuring an x-interlace error in a marking device having a printhead, the method comprising: printing a test pattern with the printhead during a plurality of passes, the test pattern containing a plurality of dashes; sensing the test pattern across the plurality of dashes printed by the printhead using a linear array sensor, wherein sensing the test pattern comprises obtaining a profile of linear array sensor responses to the plurality of dashes; determining positions of the plurality of dashes printed during each pass of the printhead, wherein determining positions of the plurality of dashes comprises determining a dash center x-position for each dash based on minimum response locations in the linear array sensor response profile, the dash center x-position being a cross process direction location of a center of a dash and wherein determining the dash center x-position comprises using quadratic interpolation to obtain the dash center x-position; and determining an x-interlace error based on the determined dash positions.