Generalized Image Acquisition and Analysis

Discovering the Structure of a Planar Mirror System from Multiple Observations of a Single Point

We investigate the problem of identifying the position of a viewer inside a room of planar mirrors with unknown geometry in conjunction with the room’s shape parameters. We consider the observations to consist of angularly resolved depth measurements of a single scene point that is being observed via many multi-bounce interactions with the specular room geometry. Applications of this problem statement include areas such as calibration, acoustic echo cancelation and time-of-flight imaging. We theoretically analyze the problem and derive sufficient conditions for a combination of convex room geometry, observer, and scene point to be reconstructable. The resulting constructive algorithm is exponential in nature and, therefore, not directly applicable to practical scenarios. To counter the situation, we propose theoretically devised geo- metric constraints that enable an efficient pruning of the solution space and develop a heuristic randomized search algorithm that uses these constraints to obtain an effective solution. We demon- strate the effectiveness of our algorithm on extensive simulations as well as in a challenging real-world calibration scenario.

News

2014-07-01

Software Update

The MATLAB Color Calibration Toolbox v2.1 (minor update) has been updated. No new functionalities this time; added error tolerance against missing packages.

2014-05-01

Eurographics 2014 Introduction to Optimization Techniques in Computer Graphics

Slides are online here.

2014-05-01

GIAnA associated with the Laboratoire Photonique, Numerique et Nanosciences (LP2N)

We will create a computational optics group at the LP2N.

2013-03-01

GIAnA joined INRIA

Generalized Image Acquisition and Analysis moved to Bordeaux to join the manao team.

2012-08-01

Emmy-Noether Group

Generalized Image Acquisition and Analysis is now supported by an Emmy-Noether grant.

2012-07-19

Software Update

The MATLAB Color Calibration Toolbox has been updated and is now supporting radiometric response curve estimation.

2011-09-28

In the press

Johannes Kepler University Linz is reporting about our E-Lecture on Computational Photography last summer term. It was the first remote-only lecture for JKU. Eleven students attended the course at JKU.

2011-07-27

In the press

Our work on dynamically displaying BRDFs is going to be featured in the September issue of 3D World, a magazine for 3D artists, covering SIGGRAPH's Emerging Technologies where we will demo our work. Matthias Hullin is quoted as "I don't expect a BRDF display to become available in the next 20 years. The principle on which the Nintendo 3DS is based was patented back in 1913!" -->

2011-04-27

Webpage updated

Projects have been imported from previous webpage.
Several changes of the webpage regarding look and usage.