JPEG XS standard (ISO/IEC 21122) for lightweight, low-latency image coding
Date & Time
Monday, October 24, 2022, 10:45 AM - 11:15 AM
Siegfried Foessel
At its 94th meeting, SC29WG1 (JPEG) decided to create a third edition of the JPEG XS standard (ISO/IEC 21122) for lightweight, low-latency image coding. While existing coding tools already support the compression of natural content and CFA Bayer pattern data well, this third edition has a strong focus on extending the previous edition with coding tools to improve the performance on screen content data. In this work, the authors will describe some of the candidate
tools that have been proposed for the third edition, and will report on their performance and performance improvements on such data.

The additional coding tools that will likely enter the standard make use of an additional frame buffer that allows to code differential frame data without compromizing the target end-to-end latency of JPEG XS. To ensure constant bitrate by frame while keeping the frame quality approximately identical, this frame buffer is combined with a gradual refresh mechanism that ensures a complete update of parts of the frame, such that a receiver switching into an already established connection will be able to retrieve a full frame after a short delay.

First experiments demonstrate that the proposed coding tools can improve the average PSNR performance of JPEG XS on screen content by more than 10dB, and approximately 3dB on computer generated content.

In this work, authors will present some of the proposed coding tools, will evaluate their performance and will discuss pros and cons of several of the proposed algorithms. Evaluation is, at this stage, limited to PSNR by frame (given the challenges for subjective studies), but includes additional parameters such as the size of the frame buffer and the required memory bandwidth. Such parameters are of interest in the JPEG XS application domain which includes FPGA
implementations which only offers limited bandwidth.
Location Name
Salon 1