- In Exercise 2:

A guessing game. Here is a Matlab code to blur and present your favorite image. If you don't have one: try this one!

- In Exercise 5:

On Image compression: if you use the tables of differential entropies of the DCT coefficients of 8x8 blocks (from Van Hateren's database) -- which can be found here in Jinggang Huang's thesis (together with many other nice data analysis results) -- as well as his estimate of 1-pixel entropy, then one finds a savings of about 2 bits per pixel using jpeg's 8x8 DCTs.

- In Exercise 6:

We propose here some MatLab code to create some Mandelbrot’s fractal landscapes.