Connexions

You are here: Home » Content » Procedure
Content Actions
Lenses

What is a lens?

Lenses

A lens is a custom view of Connexions content. You can think of it as a fancy kind of list that will let you see Connexions through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to Connexions materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual Connexions member, a community, or a respected organization.

This content is ...
Affiliated with (?)
This content is either by members of the organizations listed or about topics related to the organizations listed. Click each link to see a list of all content affiliated with the organization.
  • This module is included inLens: Rice University ELEC 301 Project Lens
    By: Rice University ELEC 301As a part of collection:"ECE 301 Projects Fall 2003"

    Click the "Rice University ELEC 301 Projects" link to see all content affiliated with them.

    Rice University ELEC 301 Projects
  • This module is included inLens: Rice University OpenCourseWare
    By: OpenCourseWare ConsortiumAs a part of collection:"ECE 301 Projects Fall 2003"

    Click the "Rice University OCW" link to see all content affiliated with them.

    Rice University OCW
Tags

(?)

These tags come from the endorsement, affiliation, and other lenses that include this content.

Procedure

Module by: Genaro Picazo

Summary: Procedure for our ELEC 301 Project for Fall 2003. By: Chris Omidiran, Genaro Picazo, Ian Wells, Daniel Wu

Our project's goal to test a series of overcomplete dictionaries composed of varied standalone bases on a few standard test images, and then analyze the results. Working towards this, we selected 3 bases and 3 pictures. Our three bases, the fourier basis, the dct basis, and the dirac basis (a basis of shifted dirac deltas), were selected based on our familiarity with them and their nature as "foundation" bases in signal processing; the dirac basis is nothing more than the canonical basis, the dct basis has use in the jpeg image format, and the fourier basis is the cornerstone of modern signal analysis. Our three images are very generalized; Lena represents a "real" image, Hobbes (of Calvin and Hobbes fame) is a grayscale line drawing with lots of "edges," and a cartoonish portrait of Edward norton provides solid blocks of color, ideal for a wavelet (or in our case, dirac) basis. While it would seem most appropriate to include a wavelet basis in our test set, we elected not to on the grounds that a) there are many, many wavelet bases out there, and b) we are too inexperienced to select an appropriately generalized one, let alone understand the transform as it occurs. Instead, the dirac basis offers a compromise - it contains the "edges" of the wavelet, arguably the best part. Our two overcomplete bases are the "dft dct" basis and the "dirac dct" basis. We ran BP and OMP with each overcomplete basis (as well as with just the dct basis, as a control) on each of the three images for 4 iterations, 16 iterations, 64 iterations, and 128 iterations. We generated our conclusions based on the compressed images produced.

Comments, questions, feedback, criticisms?

Send feedback