Pyramid transform coding using vector quantization

A progressive image transmission scheme is presented which combines block transforms, a quadtree data structure and vector quantization. The experimental results demonstrate that the scheme achieves lossless progressive transmission with compression. The quadtree data structure makes it possible to transmit the images progressively. Compression is obtained by using vector quantization on each level. Lossless reproduction is guaranteed by delivering the residual errors due to quantization from high level to low level and using an entropy coder on the final residual error image