vibe 0 Posted May 14, 2011 I noticed my entry-level qc444 model has no noise filter. I'm curious if any of the mid-end models have that? Basically for night-mode. What I do instead is run the output through Dscaler which has an excellent "temporal noise filter" that uses very little CPU but completely stabilizes the image. (I am sure I could throw a lot of money into high end cameras to also solve this but it's unaffordable) Share this post Link to post Share on other sites
rory 0 Posted May 14, 2011 Havent seen it before. In the QC444 (Dahua) there is another option that helps "somewhat" ... Using the color feature on the channel in question, you can set different contrast etc for 2 different time spans, eg. day and night. If you turn down the contrast to approx 40 and up the brightness to approx 55-60 this tends to help, though its still just so so. Share this post Link to post Share on other sites
vibe 0 Posted May 14, 2011 BTW, do you have any insight into why I am seeing light blue lines on a couple of places in the video - it's almost like it's a chroma-key happening, seems to be on a very specific shade of black - does not appear when I look at the video feed directly into the monitor. I don't see anything about chromakey in the manual. I would guess it's a bug in their design? I guess I can live with it, it's subtle enough. Share this post Link to post Share on other sites
rory 0 Posted May 14, 2011 Havent seen that, when does it happen, all the time or only at night? Other than noise, could be the camera chip and DVR compression not getting along. One thing to note though is that the QC444 is Dahua's cheapest DVR, the live and recorded quality is not quite as good as the LE-A which is one step up from that. Share this post Link to post Share on other sites
vibe 0 Posted May 14, 2011 Is LE-A q-see's part number? Or what would be their equivalent? I got this for $100 new shipped (amazon price mistake) so it was too good to pass up to get my "feet wet" with a modern security DVR. Only happens during the day. Studying the picture carefully I'd say it has to do with areas of pure white up against pure black in bright sunlight. But it only happens in one specific part of the picture - it's probably related to the same problem of how it crushes the contrast - the native signal has much better contrast range than the processed signal. Example attached. Now that the sun is shifting the problem is not as bad. Share this post Link to post Share on other sites
rory 0 Posted May 14, 2011 LE-A is the manufacturer's model number (Dahua) The QC 444 is actually the LE-AS, doubt they have the LE-A as they do mostly budget models from various brands. I would check the firmware version of the DVR, see if there is an update on QC's website. Share this post Link to post Share on other sites
vibe 0 Posted May 14, 2011 Ah okay, I found the spec sheets on your site, very interesting, thanks! There is indeed a slightly newer firmware but the changelist doesn't mention that. Alright, well for what I paid it's good enough. Share this post Link to post Share on other sites
