using PCA how to reduce the dimension of image ?

hi.. im working on computer vision .here i want to compression the motion capture data without any loss .for that .,initially i want to work with PCA .can anyone help me please to code the image using PCA.?

Answer 1

[Daniel Shub]

PCA can be used to reduce the dimensionality, but it is a lossy process. If you are not limited to lossless compression, then the princomp tutorial:

doc princomp

http://www.mathworks.com/help/releases/R2011a/toolbox/stats/brkgqnt.html#f75476

is a good starting point.

[lavan]

thanks for your response.but i cant access that doc..

[Jonny]

I cant access that doc too :(

[Daniel Shub]

You need to have the stats toolbox to use princomp (and doc princomp). The documentation is available online here:

http://www.mathworks.com/help/releases/R2011a/toolbox/stats/princomp.html

Answer 2

[Carlos]

In this document you can find something about PCA and Image http://people.maths.ox.ac.uk/richardsonm/SignalProcPCA.pdf