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Tag Archives: matlab
[MATLAB] GramSchmidt routine thoroughly explained
In Digital Signal Processing (DSP) one should often work or encounter the notion of vector and function spaces and finally orthonormal basis. The latter is one of those small building blocks which makes so many devices working and kicking. The … Continue reading
Posted in Uncategorized
Tagged code, decomposition, explanation, gram, matlab, orthogonalization, orthonormalization, qr, schmidt, source
26 Comments
[MATLAB MEX] Complementary filter for AHRS
Small, lightweight and cheap Inertial Measurement Units (IMU) made their way into many portable electronic devices. Especially those involving physical movements and rotations. There are plenty of applications starting from toy airplanes to serious Inertial Navigation Systems (INS). What exactly … Continue reading
[MATLAB] Local Correlation Tracking in Time Series
The correlation is an important notion in many fields of research or applied science. There is plethora of practical processes that literally spews timeseries, and often many at once. It gets more interesting (and more complicated) when we need … Continue reading
MATLAB : Output custom paper size figures from commandline
Matlab is great for rapid prototyping and for plotting nice figure. It is less nice when you start to demand specific things. One such thing is plotting and saving nice figure using custom size paper, position etc. Imagine you want … Continue reading
Extreme Learning Machine MATLAB MEX implementation
In real world we have plenty of data sources (e.g. finances, bioinformatics, environment monitoring, multimedia etc). Often we want to leverage this data and to predict what event will occur, which strategy to choose. Simply put – what are those … Continue reading
Posted in Uncategorized
Tagged classifier, extreme, implementation, learning, library, machine, matlab, mex
3 Comments
Longest Common Subsequence MATLAB MEX
In many applications, e.g. biological applications, one wants to compare or match two sequences. For example, two organisms have their own DNA sequence [WIKI] and a comparison would reveal their similarity based on molecules called bases (Adenine, Guanine, Cytosine and … Continue reading
OpenCV kmeans in MATLAB
Data clustering is one of unsupervised learning techniques that attempts to find some structure in the data. Given some dataset, we may be interested to see if there are some natural clusters. This is where the classic kmeans algorithm kicks … Continue reading
Extracting FREAK descriptor in MATLAB (OpenCV interface)
In Computer Vision applications the local keypoint descriptors are well known. They encode in a vector some visual information contained around a selected keypoint in the image. We outline “some” since there are many assumptions and information types that can … Continue reading
Posted in Uncategorized
Tagged descriptor, distance, freak, hamming, matching, matlab, opencv
2 Comments
[MAC] How to compile MATLAB MEX with Intel Composer XE Compiler
With new things, the good old working things may break. This was the case for Matlab [WWW] MEX [WWW] compilation after migration from Snow Leopard [WWW] to Lion [WWW]. For those who don’t know, Matlab is an advanced scientific computation … Continue reading
Bag of Visual Words – Efficient window histogram computation (MEX)
Bag of Visual Words (also known as BagofWords) [LINKS] is a well known technique describing visual content in Pattern Recognition and Computer Vision. Idea is to represent an image or an object as a histogram of visual word occurrences. Here … Continue reading