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Heritage Science
Fig. 6 | Heritage Science

Fig. 6

From: Extracting chain lines and laid lines from digital images of medieval paper using spectral total variation decomposition

Fig. 6

Laid line extraction pipeline: a original colour image with patch marked; b grayscale patch; c spectral TV band-pass filtered image; d Radon transform image depicting projection angles between 0\(^{\circ }\) and 180\(^{\circ }\) and the projection position; e plot line through image d at the 90\(^{\circ }\) angle, orange crosses mark the peaks and the grey dotted line represents the threshold; f original image with detected laid lines. Reproduced by kind permission of the Syndics of Cambridge University Library, MS Ii.5.41, fol. 10r

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