We present a fast, low-cost technique to gather high-contrast 'relightable' photographs of desktop-sized objects.
Instead of an elaborate light stage, we follow Mohan et al.; we place the object and a digitally steered spotlight
inside a white cardboard box, aim the spotlight at the box interior, and move the spot to light the object from
N repeatable lighting directions. However, strong ambient lighting from box interreflections causes 'shallow'
shadows and reduces contrasts in all basis images. We show how to remove this ambient lighting computationally
from the N images, by measuring an N ×N matrix of coupling factors between lighting directions using a mirrorsphere
light probe. This linear method, suitable for any light stage, creates physically accurate 'deep shadow'
basis images, yet imposes only a modest noise penalty, and does not require external light metering or illumination
angle measurements. Results from our demonstration system support these claims.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.