Chrominance NR Parameters

The main debugging parameters of the video chrominance NR interface NRc are sfc, tfc, trc, tpc, mode and presfc.

• The main chrominance NR parameters include sfc, trc, tfc, and tpc. In low light conditions where chrominance noise is strong, you can adjust the parameters as follows: sfc = 255, tfc = 15, tpc = 15, trc =255. In normal light conditions where chrominance noise is weak, you can adjust the four parameters to smaller values.
• sfc: strength of chrominance spatial filtering. The value range is [0, 255].
• tfc: strength of chrominance temporal filtering. The value of tfc should not exceed 15 in low light. Otherwise, side effects such as color smearing occur. The value range is [0, 32].
• tpc: filter type of chrominance temporal filtering. It is recommended that the value of tpc be the same as that of tfc. The value range is [0, 32].
• trc: used to suppress color dyeing in the motion region. It is recommended that trc be adjusted to be within 0–10 when color dyeing occurs. The value range is [0, 255].
• mode: chrominance filtering mode. When mode is set to 0, the traditional chrominance filtering mode is used. When mode is set to 1, a new chrominance filtering mode is used. In this mode, the chrominance spatial preprocessing filter can be enabled. The value range is [0, 1].
• [presfc]: strength of the chrominance spatial-domain pre-processing filter. This parameter does not take effect when mode is set to 0 and takes effect when mode is set to 1. This parameter can be used together with sfc to improve the spatial-domain chrominance NR capability. The value range is [0,32].