Freddie1275
n3wb
I noticed when I've had it on auto during the day people were kind of blurry far away. What do you think a good shutter speed would be for day time to start off testing?
Recently purchased and installed a Lorex (Dahua) 4k 8 channel 4 camera NVR system and have image quality questions..
- Thread starter Freddie1275
- Start date
That is more a function of a 2.8mm camera at a distance.
Look at this chart below - the person would need to be within 13 feet to recognize them. As I tell my neighbors with their 2.8 mm cams on their house saying they can recognize people at the street, I am like that is only possible if you already know the person and be able to recognize them based on their walk, clothing, body type, etc., but put a total stranger in the frame and the picture will be fairly useless. I recognize most of the people I see on my 2.8mm overview cam, but a total stranger goes by and not much you could tell the police, maybe clothing color, but nothing to identify them.
You can detect someone at 144 feet and beyond and maybe be able to "recognize" them if you know them and can tell their body dimension, walk, etc., but will never be able to identify a stranger or have a good enough image to share with the police.
You would need at least a 60mm lens to identify a face at 150 feet, so probably around 32mm for 70 feet. In cameras, a 2.8mm versus a 32mm results in a dramatic improvement over a distance.
Try a 1/2000, 1/4,000, and 1/10,000 shutter, but I think it will be blurry at that distance as a 2.8mm is "focused" for probably around 15 feet or so.
And you will see because of that small lens size, that if you digital zoom, it is a pixel blurry mess real fast.
Look at this chart below - the person would need to be within 13 feet to recognize them. As I tell my neighbors with their 2.8 mm cams on their house saying they can recognize people at the street, I am like that is only possible if you already know the person and be able to recognize them based on their walk, clothing, body type, etc., but put a total stranger in the frame and the picture will be fairly useless. I recognize most of the people I see on my 2.8mm overview cam, but a total stranger goes by and not much you could tell the police, maybe clothing color, but nothing to identify them.
You can detect someone at 144 feet and beyond and maybe be able to "recognize" them if you know them and can tell their body dimension, walk, etc., but will never be able to identify a stranger or have a good enough image to share with the police.
You would need at least a 60mm lens to identify a face at 150 feet, so probably around 32mm for 70 feet. In cameras, a 2.8mm versus a 32mm results in a dramatic improvement over a distance.
Try a 1/2000, 1/4,000, and 1/10,000 shutter, but I think it will be blurry at that distance as a 2.8mm is "focused" for probably around 15 feet or so.
And you will see because of that small lens size, that if you digital zoom, it is a pixel blurry mess real fast.
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Freddie1275
n3wb
If you log directly into the cameras through their ip you can set up times to have the camera change modes automatically from night and day. I just recently found this out
brianegge
Getting comfortable
I did not know the cameras had that option. On the NVR the config doesn't change and the day&night only controls is it tries to do color night vision. My script enables night mode 15 minutes after sunset and 15 minutes before sunrise. I have the previous NVR, which is about 6 months old.
My script:
Bash:
# 0=day, 3=night
for cam in $(seq 0 7); do curl --digest --user user:password "http://192.168.x.x/cgi-bin/configManager.cgi?action=setConfig&VideoInOptions\[${cam}\].NightOptions.SwitchMode=$1"; done
sebastiantombs
Known around here
You should use either IE, Chrome with the IE plug-in or Pale Moon 32 bit to make adjustments in the camera. Much more likely to "stick" when you hit "save".
Freddie1275
n3wb
Is that why when i reboot my dvr my settings are lost?
Freddie1275
n3wb
I dont like color night vision either and i cant disable it i dont think? Does your script change it to B/W automatically when the sun goes down and back to color when it comes up or do you have to set a time?
sebastiantombs
Known around here
Lorex cameras are actually stripped down Dahua cameras I believe. That being the case you can use the Dahua Sunrise/Sunset Utility to control when they gointo "night" and "day" modes. Just make sure the cameras are set to "full time" in the schedule. Keep in mind that you can set the IR to auto in the "day" to allow the camera to use IR under poor weather conditions and still "force" IR at night.
ipcamtalk.com
Dahua day/night switch utility - DahuaSunriseSunset
I wanted to use stronger noise reduction at night and weaker during the day, but Dahua seems to have made a mess of the profile management. On most cameras, there doesn't seem to be a way to have the camera switch automatically between Day and Night profiles when the camera changes between...
Freddie1275
n3wb
Thanks, I'll look into it but that seems way over my head lolLorex cameras are actually stripped down Dahua cameras I believe. That being the case you can use the Dahua Sunrise/Sunset Utility to control when they gointo "night" and "day" modes. Just make sure the cameras are set to "full time" in the schedule. Keep in mind that you can set the IR to auto in the "day" to allow the camera to use IR under poor weather conditions and still "force" IR at night.
Dahua day/night switch utility - DahuaSunriseSunset
I wanted to use stronger noise reduction at night and weaker during the day, but Dahua seems to have made a mess of the profile management. On most cameras, there doesn't seem to be a way to have the camera switch automatically between Day and Night profiles when the camera changes between...
sebastiantombs
Known around here
Given that your cameras are on an NVR it may be a little tricky getting the utility to run and it does take a PC that's on, basically, 24/7 so it may not wok out for you. You can also set the schedules in the cameras manually, but they would need to be adjusted periodically as the sunrise/sunset times change through the year. The simplicity of an NVR can make getting a system up and running very easy, but it does have the disadvantage of not being as flexible as a VMS like Blue Iris.
Freddie1275
n3wb
Thanks for your help again! That's what I'm doing now is setting up the the scheduled times manually. I'll just have to edit the times a couple times a year