Abstract
Shadow-retargeting maps depict the appearance of real shadows to virtual shadows given corresponding deformation of scene geometry, such that appearance is seamlessly maintained. By performing virtual shadow reconstruction from unoccluded real-shadow samples observed in the camera frame, this method efficiently recovers deformed shadow appearance. In this manuscript, we introduce a light-estimation approach that enables light-source detection using flat Fresnel lenses that allow this method to work without a set of pre-established conditions. We extend the adeptness of this approach by handling scenarios with multiple receiver surfaces and a non-grounded occluder with high accuracy. Results are presented on a range of objects, deformations, and illumination conditions in real-time Augmented Reality (AR) on a mobile device. We demonstrate the practical application of the method in generating otherwise laborious in-betweening frames for 3D printed stop-motion animation.
Highlights
Producing visually realistic compositions at interactive rates in Augmented Reality (AR) is becoming of increasing importance in both research and commercial applications
We extended this work to allow the automatic detection of distant light sources using a flat reflective Fresnel lens in a concentric ring arrangement to form an optical equivalent of a solid 3D light probe [36]
Results of the light-estimation method using flat Fresnel lenses detailed in Section 3 and from the shadow-retargeting approach elaborated in Section 4 and 5, are structured as follows
Summary
Producing visually realistic compositions at interactive rates in Augmented Reality (AR) is becoming of increasing importance in both research and commercial applications. It requires relighting techniques to achieve plausible integrations between virtual objects and real-world scenes Such reality mixing, when done in mobile computing, becomes challenging due to the limited amount of available resources. This seamless integration between virtuality and reality is becoming more achievable due to the recent advances in high-performance mobile computing Such cutting-edge algorithms achieve enhanced real-time capabilities for Mixed Reality (MR) applications in commercial mobile devices. When animating a real-world object through augmented reality, the background is revealed when a movement is performed on the virtual animated object This is known as the inpainting problem, in which a specific area of an image is desired to be patched according to its surrounding with a plausible outcome.
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