Abstract

Digital image processing has been utilised widely in manufacturing for accurate automated inspection. Image processing is one such technique that involves computer processing of pictures or images that have been converted to numerical form. This paper presents a critical review of the exhaustive work of digital image processing and analysis and their application to measure twist and its distribution in yarns, weave pattern, yarn colour. Techniques of spatial & frequency domain use to extract twist angle and orientation of fibre on yarn surface respectively. Characteristics of weave extracted by Obliqueness (OB) and Orthogonality (OR) and yarn color design obtained by transmitted and reflected images.

Highlights

  • Digital image processing is the use of computer algorithms to create process, communicate, and display digital images

  • The irregularity of yarn is detected from the variations in electric capacitance generated by the movement of yarn specimen that passes through the gap of a fixed air condenser

  • Spatial analysis method to extract the twist angle. This process involves extraction of the twist angles through the analysis of the yarn core surface.To extract the relatively bright surface fibers, a Sobel filter is applied to this image at a slope threshold value of 12 and by skeletonising, these fibres are reduced to 1-pixel-wide contours

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Summary

Introduction

Digital image processing is the use of computer algorithms to create process, communicate, and display digital images. Digital image processing and its analysis offers the most promising avenue to the future development of a rapid and reliable instrumental method for measurement, analysis, and real time dynamic controls of numerous textile-process and textile-product characteristics. Digital image processing can be used for testing Cotton maturity, Cross section analysis, Trash content, appearance, Fiber crimp, Fiber fineness, Fiber diameter, Fiber surface property. For yarn it can test cross section, evenness, appearance, hairiness, twist, blend analysis, spinning tension. Yarn twist is measured by removing all the twists from a certain length of a yarn and by retwisting to the same twist as proposed by Bellinson[1] and Ozkaya [2] It is a time consuming and destructive method, which can only be performed off-line. J Textile Sci Eng 4: 156. doi:10.4172/2165-8064.1000156

Concepts Used in Digital Image Processing
Uster evenness testers
Zweigle OASYS
The flying laser spot scanning
Core extraction
Spatial analysis method to extract the twist angle
Frequency domain analysis
Twist distribution measurement
Recoginitionof fabric weavecharatersitics
Yarn Diameter Measurement
Conclusions
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