RemoteFX Progressive Codec Compression

The RemoteFX Progressive Codec extends the RemoteFX Codec ([MS-RDPRFX] sections 2.2.2 and 3.1.8) by adding sub-band diffing and the ability to progressively encode an image. Sub-band diffing is a compression technique that entails transmitting the differences between the DWT coefficients of consecutive frames, while progressive encoding involves the transmission of low-quality images that are gradually refined and improved in quality.