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.


Advanced Display Technology

Lecture in winter term 2013/14

Lecturers: Ivo Ihrke, Pascal Picart

General Information

Course webpage - Libres Savoirs

When: 2014, Jan. 08th to 2014, Feb. 5th
Where: IOA/IOGS buiding room E200
Registration for mailing list: send email to Ivo Ihrke (firstname[dot]lastname[at]


In the first part, this lecture covers advanced display technology such as projector arrays, projection onto non-planar surfaces, field-of-view extension, depth-of-field extension, dynamic range extension, and 3D display technology, focussing on glasses-free techniques. In the second part, we will discuss holographic techniques, recording principles, noise issues (speckle), and computational aspects for Computer Generated Holography.

The tentative course schedule is

Wednesday 08.01.2014, 8am Introduction and Field of View Extensions / Projector Arrays / Depth-of-Field (II) [pdf]
Wednesday 15.01.2014, 8am High Dynamic Range, Light-Sensitive Displays, 3D Display Overview (II) [pdf]
Wednesday 22.01.2014, 8am 3D Display Technology (II) [pdf]
Monday 03.02.2014, 8am Introduction Holography (PP) [pdf]
Monday 03.02.2014, 10am Speckles (PP) [pdf]
Tuesday 04.02.2014, 10am Diffraction and its Numerical Computation (PP) [pdf]
Tuesday 04.02.2014, 10am Computer Generated Holography (PP) [pdf]

Q: Could you provide the bibliography on the holographic part of the course ?
A: Yes: [pdf]

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