A digital assistant for shading paper sketches

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Abstract

We present a mixed reality-based assistive system for shading paper sketches. Given a paper sketch made by an artist, our interface helps inexperienced users to shade it appropriately. Initially, using a simple Delaunay-triangulation based inflation algorithm, an approximate depth map is computed. The system then highlights areas (to assist shading) based on a rendering of the 2.5-dimensional inflated model of the input contour. With the help of a mixed reality system, we project the highlighted areas back to aid users. The hints given by the system are used for shading and are smudged appropriately to apply an artistic shading to the sketch. The user is given flexibility at various levels to simulate conditions such as height and light position. Experiments show that the proposed system aids novice users in creating sketches with impressive shading.

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Parakkat, A. D., Gowtham, H. H., Joshi, S., & Muthuganapathy, R. (2020). A digital assistant for shading paper sketches. Visual Computing for Industry, Biomedicine, and Art, 3(1). https://doi.org/10.1186/s42492-020-00049-7

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