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Place detection in visual lifelogs using 3D
Visual lifelogs tend to grow in size and the visual content presented therein is very complex. This complexity is hard to overcome in application such as localization of the camera wearer using only...
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MATLAB: Simple TF-IDF implementation
Term-Frequency word weighting scheme [WWW] is one of most used in normalization of document-term matrices in text mining and information retrieval. This down-weights the very frequent or called...
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MATLAB: Sliding window – easy and painless
When doing advanced stuff such as image processing, it is very wasteful to re-invent a wheel. This time this is about a very common operation as a sliding window operation. Imagine that we have an...
View ArticleEmbedding fonts in PDF
PDF stands for Portable Document Format [WIKI]. Not in all cases this format is that portable. Sometimes this is due to some special fonts that are not so widespread and are not included or embedded in...
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Bag of Visual Words – Efficient window histogram computation (MEX)
Bag of Visual Words (also known as Bag-of-Words) [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...
View ArticleOpenCV 2.4.0 + IPP + TBB: Compilation instructions on Mac OS X (Snow Leopard)
In Computer Vision the OpenCV [WWW] framework is a well known collection of high-quality and real-time functions performing image processing, feature extraction, matrix operations, object detection and...
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Efficient computation of element presence in a set of windows
It seems trivial to verify presence of an element (x,y) in a rectangle window. Now imagine that you have millions of elements and many thousands or more of windows. Your problem quickly gets unwieldy...
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[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...
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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”...
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[MATLAB] Gram-Schmidt 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...
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