A new objective method of measuring fabric wrinkles using a 3-D projectinggrid technique

A new objective method for evaluating fabric wrinkles involves a 3-D projec ting grid technique based on image processing. The uniform grid is projecte d on the AATCC replica surface, and then the gridded image of each replica is captured by the image capturing system. Noise reduction and extraction o f the horizontal features of the image by enhancement and horizontal filter s follow, and finally the projected grid phase is analyzed. The 3-D shape o f the wrinkling of each replica is reconstructed with the data calculated f rom the deformation of grid lines obtained from the image capturing system. Based on the reconstructed 3-D information of each replicate, the degree o f wrinkling is quantified using parameters that describe the quantity of fa bric wrinkling: roughness ratio, surface area ratio, wrinkle density, and p ower spectrum density of the fast Fourier transform. Results indicate that the grades of AATCC wrinkle recovery replicas show a good logarithmic relat ionship with the parameters defined in this study. The precise and reliable wrinkle grades of four colored and complicated fabric patterns are obtaine d by using the wrinkle grading equation through multiple regression of four parameters.