Scribbles to vectors

Abstract

This paper describes the work carried out on off-line paper based scribbles such that they can be incorporated into a sketch-based interface without forcing designers to change their natural drawing habits. In this work, the scribbled drawings are converted into a vectorial format which can be recognized by a CAD system. This is achieved by using pattern analysis techniques, namely the Gabor filter to simplify the scribbled drawing. Vector line are then extracted from the resulting drawing by means of Kalman filtering.

Vectorization of Line Drawings via Polyvector Fields

“…For vectorization of curvy line drawings, existing methods vary by the amount of noise allowed in the input. Noisy line drawings with multiple overlapping strokes or hatching pa erns require deviation from the drawn image in favor of simplicity [Bartolo et al 2007;Favreau et al 2016]. Guided by a similar motivation, De Goes et al [2011] propose a method to extract a simpli ed curve network for noisy drawings.…”

“…Input image (d) is from www.easy-drawings-and-sketches.com, ©Ivan Huska; the other input image (a) is from [Favreau et al 2016]. Since our method is not aimed at drawings with fuzzy lines, we have filtered the le sketch using [Bartolo et al 2007] (b) but trace curves starting from dark pixels of the original sketch. Fig.…”

“…18), due in large part to its variational nature. Note that since drawings with multiple overlapping strokes, such as inputs in [Favreau et al 2016], were not the focus of our work, we ran [Bartolo et al 2007] on the le image, while tracing the curves from the dark pixels in the original sketch.…”

“…Noise robustness. We have evaluated noise robustness of our algorithm by testing on images polluted by various degrees of Gaussian Input Image [Favreau et al 2016] Input Image filtered with [Bartolo et al 2007] Fig. 24.…”

“…Since our method is aimed at truthfully vectorizing images, rough sketches with multiple overlapping strokes may require additional simplification (c). To a certain degree, we can merge nearby parallel strokes by pre-filtering the input image with [Bartolo et al 2007] ((c), right), but tracing from the original narrow band, similarly to Fig. 18.…”