License plate camera 4K-level high-definition lens, BT.2020 color gamut standard. The BT.2020 color space has been positioned by the ITU International Telecommunication Union as an image signal color gamut standard in the 4K/8K era, and it is also one of the standards for Ultra HD Blu-ray. The ordinary Blu-ray standard uses the BT.709 color space, which only covers 35.9% of the BT.2020 color space. The latter is currently the largest color space in display devices, covering 75.8% of the CIE 1931 color space.