The use of a 2-D digital filter in the objective evaluation of seam puckeron 3-D surfaces

In order to evaluate the puckering of seams on three-dimensional garment su rfaces objectively, the surface contours due to garment silhouette and drap e must be taken into consideration. In this paper, a 2-D FIR band-pass digi tal filter is proposed to extract pucker profiles from the measured profile s by removing the 'high-frequency' components due to fabric-surface texture and 'low-frequency' components due to three-dimensional garment-surface co ntours. The filter was found to be very successful when applied to evaluate seams, even when twisted and laid on double-curvature surfaces that simula te the complex three-dimensional garment surfaces. The objective parameters derived from the pucker profiles after 2-D filtering were found to be line arly correlated with the subjective AATCC pucker grades.