Multi-camera Radiometric Surface Modelling for Image-Based Re-lighting

This contribution describes an automatic method to retrieve the diffuse radiometric surface model of moving persons or other objects along with the object geometry using a multi-camera system. The multi-camera equipped studio allows synchronised capture of the foreground action and a visual hull computation is then used to compute a 3D model of that scene. The diffuse surface reflection parameters are computed using the 3D model from that process together with an illumination map of the studio. The illumination map is a high dynamic range image generated from a series of images of the studio using a camera equipped with a spherical (fish-eye) lens. With this setup our method is able to capture any action in the studio under normal lighting. This document was originally published in Proc. of 28th DAGM Symposium, September 12-14, 2006, Berlin, Germany. Technical Note number: R&D 143 © BBC 2007. All rights reserved. © BBC 2007. All rights reserved. Except as provided below, no part of this document may be reproduced in any material form (including photocopying or storing it in any medium by electronic means) without the prior written permission of BBC Future Media & Technology except in accordance with the provisions of the (UK) Copyright, Designs and Patents Act 1988. The BBC grants permission to individuals and organisations to make copies of the entire document (including this copyright notice) for their own internal use. No copies of this document may be published, distributed or made available to third parties whether by paper, electronic or other means without the BBC's prior written permission. Where necessary, third parties should be directed to the relevant page on BBC's website at http://www.bbc.co.uk/rd/pubs/whp for a copy of this document. White Papers are distributed freely on request. Authorisation of the Head of Research is required for publication. Multi-camera radiometric surface modelling for image-based re-lighting