What is meant by progressive transmission? Define lossless channel. - Compression Standard

What is meant by progressive transmission? Define lossless channel.

Progressive Transmission:

- A low resolution of an image is sent first.

- IT needs only few bits for the purpose of encoding.

- The image is then updated to the required fidelity.

- This is done by transmitting more information.

Lossless Channel:

- The lossless channel is described by a channel matrix.

- It is described with only one non-zero element in each column.

- During transmission, no source information is lost.