Generalized Image Acquisition and Analysis

Eikonal Rendering: Efficient Light Transport in Refractive Objects

We present a new method for real-time rendering of sophisticated lighting effects in and around refractive objects. It enables us to realistically display refractive objects with complex material properties, such as arbitrarily varying refraction index, inhomogeneous attenuation, as well as spatially-varying anisotropic scattering and reflectance properties. User-controlled changes of lighting positions only require a few seconds of update time. Our method is based on a set of ordinary differential equations derived from the eikonal equation, the main postulate of geometric optics. This set of equations allows for fast casting of bent light rays with the complexity of a particle tracer. Based on this concept, we also propose an efficient light propagation technique using adaptive wavefront tracing. Efficient GPU implementations for our algorithmic concepts enable us to render visual effects that were previously not reproducible in this combination in real-time.


Introduction to Image Processing and Computer Vision

Lecture in winter term 2013/14

Lecturer: Ivo Ihrke

General Information

Course webpage - Libres Savoirs

When: 2014, Jan. 23rd to 2014, Apr. 10th
Where: IOA/IOGS buiding room E201
Registration for mailing list: send email to Ivo Ihrke (firstname[dot]lastname[at]


This lecture covers basic image processing techniques in two dimensions. Special emphasis will be put on the origin of images, i.e. including detection and noise sources. Apart from that, the course will include both classic as well as more modern developments in the area.

The tentative course schedule is

Thursday 23.01.2014, 8am Introduction and Sensor Technology Overview [pdf sensors]
Thursday 31.01.2014, 8am Noise, Dynamic Range, and Color [pdf noise/dr/color]
Thursday 06.02.2014, 8am Compression and Signal Processing [pdf compression]
Thursday 13.02.2014, 8am Images as Functions [pdf functions]
Thursday 20.02.2014, 8am Distance Functions, Edge Detection and Convolutional/Non-Convolutional Filters [pdf filters]
Thursday 27.02.2014 vacances
Thursday 06.03.2014, 8am projet d'ingenieur
Thursday 13.03.2014, 8am Image Statistics, Histograms & Feature Detection [pdf stats & feature detection]
Thursday 20.03.2014, 8am cancelled
Wednesday 26.03.2014, 10am cancelled
Thursday 03.04.2014, 10am Feature Detection and Invariance [pdf feature description]
Thursday 10.04.2014, 10am Image Blending and Panoramas [pdf blending & panoramas]


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