ariance matrix for the set of images?
>
I wrote a short script for doing PCA on images using python, with some
explanations and example code
http://jesolem.blogspot.com/2009/01/pca-for-images-using-python.html here .
Could be of help to you guys.
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>Paul McGuire wrote
> # following approx fromhttp://www.dfanning.com/ip_tips/color2gray.html
> grayscale = lambda (R,G,B) : int(0.3*R + 0.59*G + 0.11*B)
> print [ [ grayscale(rgb) for rgb in row ] for row in sampledata ]
Paul
in PIL handbook ,they mention a Luma transform on page15, under the
im
On Feb 21, 1:41 am, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
> hi guys
> i am trying out PCA analysis using python.I have a set of
> jpeg(rgbcolor) images whose pixel data i need to extract and make a
> matrix .( rows =num of images and cols=num of pixels)
> For this i need to represent an i
On Feb 21, 7:35 pm, "Bronner, Gregory" <[EMAIL PROTECTED]>
wrote:
you can do this using numpy and scipy
> fairly easily, and you can transform PIL arrays into Numpy arrays pretty
> quickly as well.
>
i can use numpy ndarray or matrix once i have a PIL array with
elements in the correct format(ie a
, February 21, 2008 2:41 AM
To: python-list@python.org
Subject: using PIL for PCA analysis
hi guys
i am trying out PCA analysis using python.I have a set of
jpeg(rgbcolor) images whose pixel data i need to extract and make a
matrix .( rows =num of images and cols=num of pixels) For this i need to
Hi,
You should convert your data to numpy and make it 1D (for the moment, it is
3D) by calling the ravel() method. Then you can create your covariance
matrix ;)
Matthieu
2008/2/21, [EMAIL PROTECTED] <[EMAIL PROTECTED]>:
>
> hi guys
> i am trying out PCA analysis using python.I have a set of
> j
hi guys
i am trying out PCA analysis using python.I have a set of
jpeg(rgbcolor) images whose pixel data i need to extract and make a
matrix .( rows =num of images and cols=num of pixels)
For this i need to represent an image as an array.
i was able to do this using java's BufferedImage as below
