For transmission of ultra-high-definition video at low bit rates
The input high-resolution video is down-sampled before being encoded. The decoded video frames are up-sampled to the original resolutions on the reception side by applying super-resolution techniques with the aid of side data optimized on the transmission side. Greater efficiency is achieved by compressing the side data as well.
The previous system used only the difference from the original image to determine the fidelity during optimization on the transmission side. The new system also considers the structural similarity*2 of the image pattern, thus enabling optimization in a similar way to how the human vision faculty works.
We have implemented tone reduction/reconstruction functions to transmit 12-bit (4096 levels per color) video through a transmission system for 8-bit (256 levels per color) video.
We are now developing an 8K transmission system incorporating these technologies. We also plan to conduct a verification of the whole transmission system, including the channel coding and RF modulation.
*1 Super-resolution technique: Technology to increase the resolution by supplementing edges and detailed patterns.
*2 Structural similarity: Degree of similarity in terms of rough patterns of appearances