Image noise reduction is of no use and should be avoided at all costs, whenever using cctv grabs. The problem is that it only reduces and never gives any detail on the subject. Those are designed not for forensics, but for making technicaly poor looking pictures to look better. But _video_ noise redution can be used, and there is quite simple yet powerful free tool for this.
As I see by the time/date font and placement, that the DVR you use is a typical costumized korean-base-design (whatever it's brand name might be - Optiva VODVR or whatever) that saves VVF files.
Use Export-->AVI in the supplied player, with the most lossless codec possible (anything intraframe only, or just uncompressed)
Load it up in Virtual Dub software that you can get in www_virtualdub_org
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Open up filters and [Add..] "temporal smoother" filter, slide it up to appropriate lavel (3/4 of full scale might be sufficient even for super dark night recordings, given a good, sensitive monochrome camera).
You can also add resize filter to correct aspect ratio and crop out the useful portion of captured frame.
Then select compression (mpeg4 or something) and save!
Works like a charm. Check it in this video example from me (actual bad guys in quite a dark environment without any IR projector):
www_dtech_lv/misc/20091026012404-CH9_avi
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Note about VVF file playback/export tool that is supploed with the DVRs: it has a date overlay that cannot be disabled in export video and nasty bugs with audio export, that oftenly adds cracks and distorted noises in resulting exports. Check my websie in a few weeks, as I am gona post my fixed version of the player (that does not add date overlay) and my own made audio track lossless demultiplexer that does things perfectly.
I will also post many interesting videos with actual felons in operation, as soon as I update the site.
