Density Measurement of High-Tightness Woven Fabric using Variation of Field of View Stereo Photometry Method

High-tightness woven fabric (HTWF) density measurements have been developed using image analysis. In this study, the measurement of HTWF density is based on the three-dimensional surface structure of the fabric using the stereo photometry method. The woven fabric image was recorded with two fields of view (FOV). In each FOV, the image was recorded six times with different light directions. The unbiased stereo photometry algorithm was used to reconstruct the six images, resulting in a three-dimensional surface structure. The Hough transform detects and corrects the reconstructed image’s skew. The yarn position is obtained using the fabric surface structure profile. Finally, the weft and warp profile curves were smoothed using a locally weighted smoothing (LOESS) filter. The measurement error of woven fabric density at FOV 1 for twill weave patterns with errors in warp 2.88 to 5.83% and weft 1.69 to 4.93%, and satin weave patterns with errors in warp 1.15 to 2.93% and weft 0.96 to 3.22%. While the measurement error of woven fabric density at FOV 2 for twill weave patterns with errors in warp 0.25 to 1.31% and weft 0.28 to 1.82%, and satin weave patterns with errors in warp 0.04 to 1.01% and weft 0.04 to 0.82%.