Generalized Image Acquisition and Analysis

Time-resolved 3D Capture of Non-stationary Gas Flows

Fluid simulation is one of the most active research areas in computer graphics. However, it remains difficult to obtain measurements of real fluid flows for validation of the simulated data. In this paper, we take a step in the direction of capturing flow data for such purposes. Specifically, we present the first time-resolved Schlieren tomography system for capturing full 3D, non-stationary gas flows on a dense volumetric grid. Schlieren tomography uses 2D ray deflection measurements to reconstruct a time-varying grid of 3D refractive index values, which directly correspond to physical properties of the flow. We derive a new solution for this reconstruction problem that lends itself to efficient algorithms to robustly work with relatively small numbers of cameras. Our physical system is easy to set up, and consists of an array of relatively low cost rolling-shutter camcorders that are synchronized with a new approach. We demonstrate our method with real measurements, and analyze precision with synthetic data for which ground truth information is available.

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.