Sketch-based 3-D modeling for piecewise planar objects in single images

3-D object modeling from single images has many applications in computer graphics and multimedia. Most previous 3-D modeling methods which directly recover 3-D geometry from single images require user interactions during the whole modeling process. In this paper, we propose a semi-automatic 3-D modeling approach to recover accurate 3-D geometry from a single image of a piecewise planar object with less user interaction. Our approach concentrates on these three aspects: (1) requiring rough sketch input only, (2) accurate modeling for a large class of objects, and (3) automatically recovering the invisible part of an object and providing a complete 3-D model. Experimental results on various objects show that the proposed approach provides a good solution to these three problems. Graphical abstractWe propose a sketch-based planar object modeling system. The flow chart of our approach goes as the following steps: (1) The original image. (2) Roughly sketched vertices and edges for the visible part of the desired object. (3) Automatically generated 2-D initial wireframe W 2 di . Note that some vertices in W 2 di have no precise locations, which are highlighted with red stars. (4) Precise reconstruction of 3-D wireframe M v 3 dw from W 2 di . (5) Inference of the hidden 3-D geometries (marked with dotted lines). (6) Complete 3-D objects.Display Omitted HighlightsWe reconstruct a complete object from a user-drawn sketch depicting its visible part.The input sketch consists of two elements: sketch vertices and sketch lines.The 3-D reconstruction process in our system is semi-automatic.The system can produce a precise planar object.