matplotlib installation

I am using Ubuntu 14.04, python 2.7.6, and I install matplotlib by sudo apt-get python-matplotlib. But when I import matplotlib, it says "ImportError: No module named matplotlib". It turns out that I have to install all the dependencies as well.

According to here, these steps should be taken

1. Enable Universe repository in software and updates

2. sudo apt-get update 

3. sudo apt-get build-dep python-matplotlib

After these steps, matplotlib still does not work. So I install the Anaconda, which is supposed to provide all the popular dependencies. It turns out that matplotlib still can not be imported. 

After a while, matplotlib suddenly works! As far as I can remember, I performed the numpy and scipy tests, and relaunches the ipython notebook. 

Latex reference order

When I compile the latex file, I find that the references are not listed in the order of their appearance. I am not sure whether this is because there are citations in the figure caption, and change the bib style to ieee trans does not work.

According to here, this could be addressed by adding the following to the preamble.tex

\bibliographystyle{unsrtnat}
\usepackage[numbers,sort&compress]{natbib}

Matlab functions for computer vision

A great resource of matlab functions I encountered is here. Another useful blog that I often consult is this. Moreover, I also refer to this one sometimes.

Deep learning resource lists

At present, deep learning is very very hot, and there are numerous papers for this topic. Here is a resource lists that contains almost all one wants to know about deep learning.

Implicit shape model from RWTH

I have read the paper about an impressive object detector long time ago. Today I found that it was a work from RWTH, where I have visited! Here is the resource of the implicit shape model. The matlab version of the code can be found here.

Yet another issue with calcOpticalFlowPyrLK

I remember that I encountered once the problem of 

OpenCV Error: Assertion failed ((npoints = prevPtsMat.checkVector(2, CV_32F, true)) >= 0) 

when I was using calcOpticalFlowPyrLK. It turned out that the format of features passed to calcOpticalFlowPyrLK should be Point2f, instead of keypoint. Here is an example of how to use it. 

Another good CV blog

Today I found another wonderful CV blog here. One post talks about BRIEF seems to be interesting.