Free-viewpoint photometric compensation

PubDate: November 2016

Teams: The University of Electro-Communications

Writers: Naoki Hashimoto；Takamitsu Goto

PDF: Free-viewpoint photometric compensation

Abstract

In this research, we propose a photometric compensation technique with a camera placed away from user’s viewpoint. In general approaches, compensated images which can be projected without effect from projection surfaces, including from their colors and shapes, are calculated based on a camera image captured from the user’s viewpoint. Recently, these techniques have become to be expected to change ordinary rooms into immersive VR and AR environments [Jones et al. 2014]. The compensation is performed based on the response function between a projector and a projection surface, obtained by some measurement techniques [Hashimoto and Kosaka 2015]. Practical measurement includes lots of errors and the response function is only a rough approximated. Therefore, in many previous approaches, iterative calculation to refine projected images is an essential feedback process for the photometric compensation.

However, placing the camera at the same position as the user’s viewpoint is a huge limitation for the practical use of these techniques. Therefore, we propose a photometric compensation with a virtual camera which simulates a user’s view by using images obtained from a real camera placed away from the user.