The JPEG XS codec for all IP workflows comes with new features

© Fraunhofer IIS

JPEG XS is a special designed compression codec to enable transmission of high quality images up to 8k over Internet Protocol in production quality. The ISO standard for JPEG XS was issued in 2019 and the codec is now on its way to the market. A patent licensing pool program and several Software Development Kits SDKs were set-up to pave the way for industry partners to get access to and implement JPEG XS in various media workflows or devices.

The low-latency, low-complexity and standardized JPEG XS codec has now achieved good market acceptance. Many applications have already been realized, especially for broadcast content transfer to and from the cloud. The first edition of the standard ISO/ IEC 21122 was originally designed to enable high-quality 422 and 444 broadcast content data transmission.

In parallel with the development of the coding standard in ISO, many companion standards have been developed that support the transport of JPEG XS over RTP (IETF RFC 9134) or MPEG-TS (ISO/IEC 13818-1) or store codestreams in MP4, HEIF or MXF (SMPTE ST2124) file formats. Associations like VSF and AMWA defined specifications for JPEG XS to enable higher interoperability in networked media. Due to market demand, further improvements resulted in a second edition recently published, and a third edition on its way.

JPEG XS for RAW Bayer compression

The second edition added RAW Bayer data compression for CFA (Color Filter Array) image sensors to enable compression in digital cameras with highest quality. Image sensor data have specific characteristics in black level and noise behavior. While considering these characteristics an optimized coding with highest performance can be achieved. An improvement in quality up to* 5dB could be demonstrated in comparison to data agnostic compression. Further features in the second edition are profiles for 420 image compression and mathematically lossless compression of image data.


Compression efficiency for screen and mixed signal content

A third edition of the standard has recently been launched. The focus is to achieve better compression efficiency for screen and mixed signal content. The build-in wavelet transform in the JPEG XS coding algorithm allows for a good energy compaction in natural images, resulting in good performance for this type of content. However, this alone is not ideal for screen content. Because of this, data from the previous frame in a sequence are now allowed to be used to predict the actual frame. This method does not increase the latency, but requires slightly more memory resources to store previous data in a buffer. We were able to improve the PSNR (Power Signal Noise Ratio) up to 10 dB for screen content. The third edition is still under development, but its publication is scheduled for begin of 2023.

Fraunhofer IIS offers JPEG XS SDKs for x86 CPUs, ARM CPUs and NVidia GPUs.




Siegfried Fößel

Fraunhofer IIS

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