Frederick George Walls

BDC-1: A robust algorithm for display stream compression

BDC-1 is a low-complexity algorithm to compress digital video in real time in a visually lossless way for transmission over display links. The algorithm is based on DPCM, with a number of improvements. The decoder infers prediction modes and quantization levels based on previously received data. The entropy coding facilitates decoding at 3 pixels per clock at low cost. The decoded image quality is superior to many state-of-the-art low-cost compression schemes, particularly on pathologically difficult and computer-generated content.

Overview of Screen Content Video Coding: Technologies, Standards, and Beyond

This paper presents recent advances in screen content video coding, with an emphasis on two state-of-the-art standards: HEVC/H.265 Screen Content Coding Extensions (HEVC-SCC) by ISO/IEC Moving Picture Experts Group and ITU-T Video Coding Experts Group, and Display Stream Compression (DSC) by Video Electronics Standards Association. The HEVC-SCC enhances the capabilities of HEVC in coding screen content, while DSC provides lightweight compression for display links. Although targeting different application domains, they share some design principles and are expected to become the leading formats in the marketplace in the coming years. This paper provides a brief account of their background, key elements, performance, and complexity characteristics, according to their final specifications. As we survey these standards, we also summarize prior arts in the last decade and explore future research opportunities and standards developments in order to give a comprehensive overview of this field.