Evaluating the robustness of objective pilling classification with the two-dimensional discrete wavelet transform
Palmer, Stuart and Wang, Xungai 2004, Evaluating the robustness of objective pilling classification with the two-dimensional discrete wavelet transform, Textile research journal, vol. 74, no. 2, pp. 140-145.
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Previously, we proposed a new method of frequency domain analysis based on the two-dimensional discrete wavelet transform to objectively measure pilling intensity in sample fabric images. We have further evaluated this method, and our results indicate that it is robust to small horizontal and/or vertical translations and to significant variations in the brightness of the image under analysis, and is sensitive to rotation and to dilation of the image. These results suggest that as long as precautions are taken to ensure fabric test samples are imaged under consistent conditions of weave/knit pattern alignment (rotation) and apparent interyarn pitch (dilation), the method will yield repeatable results.
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