Automatic assessing and monitoring of weaving density

Design and implementation of weft density feedback control system on weaving loom

“…Despite the fact that there are different methods for measuring weft density [14][15][16][17][18][19][20][21][22][23][24][25][26], there are not suitable for applying in an on-line measuring device for the control system. These methods are not able to measure weft density in uneven fabric.…”

Detecting defective electrical components in heterogeneous infra-red images by spatial control charts

“…Lin and Chiu have utilized Hotelling T2 control chart to detect lighting variation defects in LCD monitors [3]. Tun'ak et al have applied SPC for detecting plain weave fabric defect and monitoring weaving density in the direction of the fabric length [4]. Majority of other researchers like Armingol et al [5] and Colosimo et al [6,7], have used non-spatial control chart for finding defects.…”

Vision-Based On-Loom Measurement of Yarn Densities in Woven Fabrics

“…Corresponding sample fabrics can be found in the database published in [15]. Techniques for fabric density measurement based on the analysis of the fabric's Fourier spectrum are discussed by Xu [16], Tunák et al [17], Ravandi [18], and Sari-Sarraf and Goddard [19] who designed straightforward band-pass filters in the frequency domain and apply these to the signal to extenuate frequencies that do not relate the repetitive pattern of wefts and warps. After filtering and inverse transformation into the spatial domain, basic image-processing techniques are used to the measure the periodicity of the filtered image and hence derive the distance between adjacent yarns.…”