But how NV handles the case where the lightning conditions vary a lot during the video clip? Is the Noise level setting useful in Noise filter settings? I studied this by recording a video clip that started from my room's corner and ended to a clear blue sky seen through the window. I also made a single video frame that contained calibration targets recorded at variable lightning (=gain) conditions.
My goal here is to find settings for NV that:
- - leave the frames that are taken in good lightning (low gain) untouched
- reduce considerable the noise in frames taken in low light (high gain)
Next I left the Noise level settings in their default positions and processed my video clip. The result was satisfactory. Some details were lost in the low-gain part, and the noise in the high-gain part was reduced a lot, but is still a bit annoying.
The Noise level setting is probably useful in processing photographs where the noise levels are quite low. But the situation is quite different when we talk about videos taken with digicams and home camcorders. I wonder if the inverted Noise level setting could help in filtering home videos. That is, the noise below a certain level is preserved, and only the higher elements are reduced.