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.
Highlights
Given an outer boundary, it is easy to fill the area with a single color
Though a lot of work has been done to create a 3D reconstruction from a single image, it is proven that general 3D reconstruction is difficult
Iso-contour identification To divide the sketch into different boundaries, the pixels in the rendered 2.5D mesh must be classified based on the intensity
Summary
It is easy to fill the area with a single color. shading brings life to a sketch. Based on very little information provided by the user, a 2.5D inflation of the digital version of the paper sketch (acquired by scanning) is computed.
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