Introduction - If you have any usage issues, please Google them yourself
* pca.cpp
This program demonstrates how to use OpenCV PCA with a specified amount of variance to retain. The effect is illustrated further by using a trackbar to change the value for retained varaince.
The program takes as input a text file with each line begin the full path to an image. PCA will be performed on this list of images. The author recommends using
the first 15 faces of the AT&T face data set:
http://www.cl.cam.ac.uk/research/dtg/attarchive/facedatabase.html