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Jun
17
awarded  Popular Question
Jun
11
accepted Singular Value Decomposition for an image understanding
Jun
11
comment Singular Value Decomposition for an image understanding
OK, I think I understand now. Many thanks for the time.
Jun
11
comment Singular Value Decomposition for an image understanding
I've added a picture to illustrate what I meant if that's a help. I'm still a bit confused as to why we're looking at $AA^T$.
Jun
11
revised Singular Value Decomposition for an image understanding
added 441 characters in body
Jun
11
comment Singular Value Decomposition for an image understanding
Thanks for this - I understand taking the sum of the first few singular values/vectors gives a low rank approximation of the image. What I don't understand is why we are looking at the roots of eigenvalues and the eigenvectors of the image multiplied by its transpose. For instance, If I plotted the first left singular vector as a signal, it gives an approximation of the intensity values of the rows of the image. I'm a bit unsure why it shows this.
Jun
11
comment Singular Value Decomposition for an image understanding
@Omnomnomnom Yes :)
Jun
11
asked Singular Value Decomposition for an image understanding
May
15
awarded  Inquisitive
May
14
comment Finding peaks and oscillations in a signal
This is rather like the cross correlation idea - I was trying scaled versions of a Gaussian (chosen in a very heuristic manner!) but found it to be very sensitive to subtle signal changes. I'll give this approach a go and see how I get along with it, thanks!
May
14
asked Finding peaks and oscillations in a signal
May
10
answered Not understanding solution to $\large \int_{|z-2|=2} \frac {5z+7}{z^2+2z-3}dz$ computation
Apr
17
comment How do I apply this PDE as an image filter?
@Kris I don't know anything about your problem personally, but Peter Kovasi has an anisotropic diffusion function on his page; perhaps his implementation may be of help to you? csse.uwa.edu.au/~pk/research/matlabfns
Apr
16
revised How do I apply this PDE as an image filter?
Added Mathjax + hyperlink
Apr
16
suggested approved edit on How do I apply this PDE as an image filter?
Apr
1
comment What is the name of a number ending with zero's?
Not sure why.. but I read that as France Finance
Mar
26
comment Mathematical introduction to machine learning
It's funny you say that because I was actually looking to go into fluids or pdes and due to circumstances I had to accept a phd closer to where I was living at the time! I didn't think it would be as interesting as I'm not a huge fan of stats, but some of the neural networks and Fourier analysis is actually very interesting. You'll fly through the material with your background :-)
Mar
26
comment Mathematical introduction to machine learning
Yes, that's right.
Mar
26
comment Mathematical introduction to machine learning
Many thanks :-) I'll have a read of Smola's text. I'm in a fairly similar position where I've gone from a maths degree to a PhD in pattern recognition and machine learning. I only did one basic stats course so would like a more mathematical text to supplement Ng's course and Bishop's book.
Mar
25
comment Mathematical introduction to machine learning
Or perhaps stats.stackexchange.com - I've read a few questions there regarding machine learning techniques. I'm currently learning from Ng's course and Bishop's book - so will be interesting to see if you find something nice!