Documentation and source code related to quantization can be found at

A set of slides for scalar quantization in the information theory course offered at Delft University can be found at

A set of slides for vector quantization in the information theory course offered at Delft University can be found at

A quick introduction to Vector Quantization is

An excellent article *Image Compression - from DCT to Wavelets : A Review* can be
found at

A graphics-based demonstration of the wavelet transform is online at

There are two programs included, one to demonstrate the 1D wavelet transform and the other for 2D image compression. In the 1D program, one simply draws the curve that is to be transformed.