Automatic detection of layout of color yarns of yarn‐dyed fabric. Part 2: Region segmentation of double‐system‐Mélange color fabric

Abstract

To detect the layout of color yarns automatically, a novel projection‐based fabric segmentation method is proposed to segment the double‐system‐mélange color fabric into several regions, which can be seen as single‐system‐mélange color fabrics. This method consists of five main steps: (1) yarn skew detection, (2) fabric image projecting, (3) projection curve smoothing, (4) variance curve calculating, and (5) curve peak confirmation. Based on the acquisition fabric image, the skew angles of warp and weft yarns are detected by Hough transform first. The projection curves of L, a, and b channels in Lab color model are generated and smoothed by Savitzky–Golay filter. The variance curves of L, a, and b are then calculated, and the peaks corresponding to the regional boundaries in each curve are detected. The regional boundaries are confirmed by synthesizing the curve peaks of L, a, and b. The experimental and theoretical analysis proves that the proposed method can segment the double‐system‐mélange color fabric into regions with satisfactory accuracy and good robustness. © 2015 Wiley Periodicals, Inc. Col Res Appl, 41, 626–635, 2016

Automatic detection of layout of color yarns of yarn‐dyed fabric. Part 3: Double‐system‐Mélange color fabrics

“…This study aims to inspect the layout of color yarns of double‐system‐mélange color fabric by integrating the previously proposed novel projection‐based region segmentation method and FCM‐based stepwise classification method . The proposed algorithmic architecture is shown in Fig.…”

“…The proposed algorithmic architecture is shown in Fig. , which can be divided into three stages: fabric region segmentation, fabric region selection, and yarn layout recognition.…”

“…To inspect the layout of color yarns of different yarn‐dyed fabrics, the yarn‐dyed fabrics are classified into two categories: double‐system‐mélange and single‐system‐mélange color fabrics, according to the types of color yarn in the fabric image . The layout of color yarns has been recognized for single‐system‐mélange color fabrics by the FCM‐based stepwise classification method in Part I of the series of studies, and the region segmentation has been realized by the projection‐based region segmentation method for double‐system‐mélange color fabrics in Part II of the series of studies . In this study, we focus on the layout of color yarns recognition for double‐system‐mélange color fabrics and the analysis and discussion of the proposed method.…”

“…Current recognition methods for the layout of color yarns of yarn‐dyed fabric follow a similar procedure: a fabric image is captured and preprocessed; the weft and warp yarns are both segmented and the yarn floats are localized; the color of every yarn float is identified by a clustering algorithm; and the color of each weft and warp yarn is confirmed and the layout of color yarn is produced by genetic algorithm‐based method or statistical analysis technique . The detection accuracy of the yarn color depends on the results of yarn segmentation.…”

“…The recognition of the layout of color warp yarns (as shown in the bottom of Fig. ) for double‐system‐mélange color fabrics can be carried out in three steps: segment the double‐system‐mélange color fabric into different warp regions, which can be seen as a single‐system‐mélanges color fabric; select one reasonable region with greater frequency of the regional weft color, such as “Region 2”; and detect the layout of color yarns of single‐system‐mélanges color fabric. To inspect the layout of color yarns, the yarns in the fabric should be segmented first, as labeled in the red square in middle, and then the color of the warps should be detected, as labeled in the yellow, orange, and blue squares.…”