Generalized Image Acquisition and Analysis

An evaluation of optical flow algorithms for background oriented schlieren imaging

The background oriented schlieren method (BOS) allows for accurate flow measurements with a simple experimental configuration. To estimate per-pixel displacement vectors between two images, BOS systems traditionally borrow window-based algorithms from particle image velocimetry. In this paper, we evaluate the performance of more recent optical flow methods in BOS settings. We also analyze the impact of different background patterns, suggesting the use of a pattern with detail at many scales. Experiments with both synthetic and real datasets show that the performance of BOS systems can be significantly improved through a combination of optical flow algorithms and multiscale background.


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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