Category Archives: Teaching

Jun 15 2 comments
Enseignement, Recherche, Popularization

A Blogs aggregator on computer vision and image processing

A few days ago, I started a second blog called Pixel Shakers (please note the ending 's'), also dedicated to computer vision, machine vision and image processing. But the content of this one is automatically generated, as an aggregation of the posts coming from other blogs.

On the line of Planet Python, the main idea is to be able to read, in one place, posts on computer vision and image processing. When writing this post (june 15 2011), the list of "contributors" is the following:

Of course, improvements are possible. Nethertheless the site seems to work. One possibility is to search throughout all the "contributors". This search is available through automatically generated categories. For example, it is possible to find posts on  image segmentation.

I am open to any suggestions on this site. I am particularly interested in other blogs to add to the list.

Do not forget Pixel Shakers : http://shakers.pixel-shakers.fr.

FMN.

 

Jan 15 3 comments
Enseignement, Research

A minimal ImageJ Plugin in Clojure: image inversion

I show in this post how to write an ImageJ plugin with Clojure. This example is taken from Digital Image Processing: An Algorithmic Introduction Using Java: an image inversion (page 32).

The goal is to invert all the pixels of a 8-bit grayscale image, turning an image into its negative. As a pixel value is coded with 8 bits, the higher possible value is 255. The operation is thus to transform each pixel value v into 255-v.

I first present the plugin in Java, with a description of the essentials elements of an ImageJ plugin. Then, i give several Clojure versions. The last is as fast as the Java one, but more reusable.

Java version
Clojure versions

Get the whole story »

Nov 12 2 comments
Teaching

Ge2i - Physique des Capteurs - Correction (rapide) du partiel blanc

Translate original post with Google Translate

Chers étudiants de Ge2i, vous pouvez dés à présent récupérer la correction du partiel blanc, ainsi que le texte original :

Quelques indications :

  • personne n'a conduit très très peu d'étudiants ont menés de calcul d'incertitude dans la question 2, dommage.
  • dans l'ensemble peu de points gagnés sur les questions de cours.
  • relisez-vous ! Bien souvent, vous écrivez une phrase que vous imaginez refléter votre pensée, mais au final qui n'a pas de sens. Une relecture en fin d'examen vous permet de vous en rendre compte.
  • attention aux unités (fausses et  manquantes).

Bonne révisions ;o)

FMN.