  A two-layer lossless image coding method compatible with JPEG XS is proposed.
JPEG XS is a new international standard for still image coding that has the
characteristics of very low latency and very low complexity. However, it does
not support lossless coding, although it can achieve visual lossless coding.
The proposed method has a two-layer structure similar to JPEG XT, which
consists of JPEG XS coding and a lossless coding method. As a result, it
enables us to losslessly restore original images, while maintaining
compatibility with JPEG XS.
