User:Orderud

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Fredrik Orderud

Ph.D. in computer science at NTNU. My primary focus on Wikipedia is adding technical content.

• My homepage

Writing resources:

• m:Help:Formula - LaTeX math reference.
• b:LaTeX - LaTeX tutorial.

Category contributions

• Statistics, Sampling techniques, Machine learning. Estimation theory
• Computer vision. Image processing
• Signal processing, Digital signal processing
• Numerical linear algebra, Numerical software
• Computer graphics, Splines

Wikipedia contributions

Estimation theory

• Written sections regarding stability, controllability and observability, transfer function and canonical realizations in state space (controls).
• Written sections regarding system description, error metric, Kalman filter equations for both the regular and extended Kalman filter, as well as derivation in Kalman filter.
• Section regarding properties of Gauss-Markov process.
• Articles on proper and strictly proper transfer functions.
• Section regarding state space stability in Lyapunov stability.
• Created article/stub on discretization.
• Rewritten model and estimation formulas for linear prediction.
• Created minimum mean-square error (MMSE) stub.
• Created the Recursive Bayesian estimation article

Computer vision

• Image moments
• Section on Methods for determining optical flow in optical flow.
• Written article on phase correlation in computer vision.
• Created stub article on the condensation algorithm for realtime visual tracking.
• Started list of computer vision conferences

Computer graphics

• Shadow volume restructuring, and technical content
• Described the three main algorithms used for stencil shadow volume
• Algorithm to compute silhouette edges of 3D objects
• Collision detection section on mathematical foundation
• Stencil buffer stub
• Catmull-Clark subdivision surface
• Doo–Sabin subdivision surface
• B-spline blending matrices

Signal processing

• Total rewrite of Pulse-doppler radar to present the underlying principles, formulas, as well as clearifying that it is NOT based on the doppler effect.
• Wrote autocorrelation technique article, which is used to estimate the dominating frequency in a signal.

Numerical computing

• Matrix inversion, analytic formulas for 2x2, 3x3 and blockwise inversion
• Written article about Conversion between Quaternions and Euler angles
• Added Basic Linear Algebra Subprograms section about functionality
• Created Power method stub
• Standard and augmented forms in linear programming
• Simplex algorithm (in progress)
• Wrote the Matrix calculus article.
• Rejection sampling

Computer software

• Added section on (the lack of) encryption in Apple Remote Desktop.
• Features of the Remote Desktop Protocol.
• Discussed file locking in UNIX and Windows.
• Created a circular dependency article, which adresses how C++ implements circular dependencies.
• Created the Microsoft Dynamic Link Library (DLL) article, with programming examples.
• Provided sections on linear algebra, and random number generation in the Boost library.

Interesting articles

• Expectation-maximization algorithm

• The science of free will - Benjamin Libet
• Cavitation
• Space elevator