- NQI — Nonlinear Quality Index
- NTSC — National Television System Committee. The NTSC is responsible for setting television and video standards in the United States and Japan (in Europe and the rest of the world, the dominant television standards are PAL and SECAM). The NTSC standard for television defines a composite video signal with a refresh rate of 60 half-frames (interlaced) per second. Each frame contains 525 lines and can contain 16 million different colors.