Toshiba has developed a high-quality and low-bitrate video encoding technology which complies with the latest scalability extension (SHVC) to the HEVC standard to enhance existing HDTV video resolution up to 4K resolution. Developed for the purpose of concurrently delivering high-quality 4K video with HDTV, this technology reduces the additional bandwidth overhead to as low as 10Mbps, which is one-third the overhead in conventional HEVC technology.

The technology was showcased at Inter BEE to be held at the Makuhari Messe in November 19.

Demand for 4K/8K ultra HD broadcasting and network distribution services is expected to increase as 4K TVs become more popular in the market. In Japan, the Ministry of Internal Affairs and Communications (MIC) identifies bandwidth assignment for 4K/8K broadcasting as an open issue since future 4K/8K services are expected to coexist with existing HDTV services in order to meet consumer requirements. 4K and 8K services will require as much as 30-40Mbps and 80-100Mbps, respectively, while the existing HDTV broadcasting bandwidth is only 15-20Mbps. Therefore, a technology which facilitates the concurrent transmission of video at varying resolutions within a limited bandwidth is desired.

In response to this demand, Toshiba developed an SHVC encoding technology which enhances existing HDTV to high-quality 4K video with limited bandwidth overhead. The SHVC encoding technology employs a prediction-mode decision algorithm which makes efficient decisions as to where and when different prediction methods are applied, enabling dynamic bit allocation during encoding. To reduce overall data volume, inter-layer prediction algorithms are used to extrapolate image regions with irregular movements or soft-focus backgrounds while more data bits are allocated to the encoding of relatively static, in-focus image regions and thereby improving overall subjective video quality.

Toshiba achieved a further bitrate compression with its spatiotemporal noise reduction technique. By pre-filtering spatiotemporal noise from 4K data, Toshiba's engineers have succeed in limiting degradation in resolution of encoded 4K images even when the additional bitrate overhead is set to be as low as 10 Mbps.
The combination of encoding and noise reduction techniques permit the concurrent distribution of video data at varying resolutions such as HDTV and 4K/8K in limited bandwidth conditions.

Using this technique, Toshiba aims to develop video distribution services which offer consumers the choice of enhancing video resolution to 4K while maintaining compatibility with current HDTV video broadcasting standards, an ideal option ahead of the 2020 Tokyo Olympic and Paralympic Games.