Finally, such parameters are used for grading the fabrics or for characterizing their quality. While the starting point and the final results are ultimately shared by all the techniques, what changes is the method adopted for extracting the information used for pilling grading. On the basis of main literature works, in the present work the following categories are identified: 1) 2D imaging methods based on thresholding. 2) 2D imaging methods based on Fourier and/or Wavelet analysis. 3) 3D imaging methods. 4) AI-based methods (using either 2D or 3D images). Understandably, different categories could be used for describing existing works. Moreover some more recent techniques use approaches comprised in more than one of the above categories. Nevertheless, it is authors’ opinion that the given categorization, although open to improvement, is effective for understanding and systematizing the knowledge about how the pilling assessment
DVE Digital Video Effect DVI Digital Video Interactive + Digital Visual Interface .DVI Device Independent (file name extension) DVM Digital Video Manager + Digital Volt Meter DVMRP Distance Vector Multicast Routing Protocol [Internet] DVOF Digital Video Over Fiber DVR Digital Video/Voice Recorder .DVR Device Driver (file name extension) (Also see .DRV) DW Data Warehousing DWDM Dense Wavelength Division Multiplexer DWG Drawing DWMT Discrete Wavelet Multitone DWT Discrete Wavelet Transform D2X Decimal To Hexadecimal [REXX] .DXB Drawing Interchange Binary (file name extension) [AutoCAD] DXC Data Exchange Control DXF Data Exchange File + Drawing Exchange Format DXI Data Exchange Interface DYNSLT Dynamic Select [IBM] DYNSRC Dynamic Source E... | TOP | UP to D | DN to F | BOTTOM | EA Effective Address + Extended Attribute [OS/2] EAI Enterprise Application Integration EAP Extensible Authentification Protocol
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