eigenfaces

eigenfaces, an Octave code which applies principal component analysis to a set of images.

Licensing:

The information on this web page is distributed under the MIT license.

Languages:

eigenfaces is available in a MATLAB version and an Octave version.

Related Data and Programs:

eigenfaces_test

faces, a dataset directory which contains images for facial recognition applications.

imshow_numeric, an Octave code which accepts a numeric 2D array and displays it as a grayscale image.

svd_basis, an Octave code which applies the Singular Value Decomposition (SVD) to a collection of data vectors, extracting dominant modes;

svd_fingerprint, an Octave code which reads a file containing a fingerprint image and uses the Singular Value Decomposition (SVD) to compute and display a series of low rank approximations to the image.

svd_gray, an Octave code which reads a gray scale image, computes the Singular Value Decomposition (SVD), and constructs a series of low rank approximations to the image.

svd_snowfall, an Octave code which reads a file containing historical snowfall data and analyzes the data with the Singular Value Decomposition (SVD).

svd_test, an Octave code which demonstrates the Singular Value Decomposition (SVD) for a simple example.

Reference:

• Ferdinando Samaria, Andy Harter,
  Parameterisation of a stochastic model for human face identification,
  2nd IEEE Workshop on Applications of Computer Vision,
  December 1994, Sarasota, Florida.
• Neil Muller, Lourenco Magaia, Ben Herbst,
  Singular Value Decomposition, Eigenfaces, and 3D Reconstructions,
  SIAM Review,
  Volume 46, Number 3, pages 518-545.

Source Code:

• imshow_numeric.m, sets up appropriate scaling and conversion to the uint8 type so that a numeric 2D array can be displayed as a grayscale image.
• line_count.m, counts the lines in a file.
• pc_vectors.m, computes principal component vectors of an MxN array.
• pgm_display.m, displays a grayscale image that is stored in a file.
• pgm_project.m, projects a PGM image onto a set of principal component vectors.
• pgm_read.m, returns an integer array representing a grayscale image that is stored in a file, by Matt Dailey.
• pgm_write.m, writes an integer array representing a grayscale image to a file, by Matt Dailey.
• pgms_pack.m, reads a list of PGM files and packs them into a single MxN array.