Spec me a CCTV System

What I am trying to do is to sistematically have the camera trigger an alarm when an intruder passes through a 7m wide perimeter.

My first questionning was if I was doing something wrong concerning the camera parameters. This was my first assumption since in my experience superposing multiple intrusion/tripwire IVS rules on the same perimeter significantly improved the success rate.

It appears that the camera configuration is not the root cause of the detection miss. And it's good to know the camera limitations in order to improve the whole installation.

Thank You for your input!
 
Are you using intrusion or tripwires? If you use ‘intrusion’ with ‘cross and appear’ then that gives you several bites at the cherry as just ‘cross’ only triggers the rule once whereas appear triggers on every frame.

Running continuous bit rate also frees up processor cycles on the camera so that might be an option and drop the resolution down to 1080P and increase the frame rate as more frames means more opportunities to see the ‘human’ and trigger the IVS.

If you add more IVS rules then you slow all the rules down as the camera is having to constantly process several things.

There are some newer camera firmwares coming out soon and they should bring even more of the IVS type AI to what they are calling SMD3.

I’m surprised you can’t get it to trigger with a running human as I can pick up cars moving at 30mph down the street past the house.

Does the detection box have to be 7m wide? By my calculations your field of view on a 3.6mm camera mounted at 6m will be almost 50m so you’re trying for a fairly slim section of the overall screen image size.

And make sure your box is tall enough to incorporate a whole human at that distance. It’s only looking for a whole human inside the detection box, so it needs to be a big enough box to fit a whole person inside.
 
I am using intrusion AND tripwires (IVS) in superposed layers.
I designed two tripwire rules ortogonal in order to form somethink like a chess table. The idea was the intruder has to crosses the tripwire multiple times regardless of the direction he's advancing.

This chess table is placed over the intrusion perimeter.

In the intrusion perimeter I placed another intrusion perimeter, more narrow in order to increase the outside borders.

I would like to have a front yard of 60m length :) but unfortunately it's about 10-11m. Here, filming the public domain is forbidden by law. So instead masking half of the field of view of the camera in order to comply I inclined the camera a little bit more.

Thanks for the news about the new software versions!

The current boxes incorporates a whole human without problems.

WJA96 I'm very gratefull for your valuable comments and advices!
 
As I understand it, if you use the masks you’re just blanking off the displayed pixels so you could probably make your IVS box bigger - the full width of the screen maybe? And see if it picks you up running across that.

It might not work, but we won’t know unless you try.
 
Quick question with my set up @WJA96 I don't seem to have any sound off the cameras watching live or when watching playback sure i've missed something but can't see what ?


Thanks
 
In the camera menu, there is a sound option. You need to select internal microphone. It’s set to line in by default for some reason.
 
WJA96 said:
As I understand it, if you use the masks you’re just blanking off the displayed pixels so you could probably make your IVS box bigger - the full width of the screen maybe? And see if it picks you up running across that.

It might not work, but we won’t know unless you try.
Click to expand...

If my understanding is correct in order to do that I have to change the physical field of view of the camera and then to mask the public part of the view.
To do that I'll have to get again on the roof so for the moment I tried the other options:)

I reduced gradually the resolution to 1080 pts. No luck.
I increased the frame rate from 15 to 20 fps (max). No luck.
I kept only one IVS rule (perimeter). Same. I cannot get a sistamatic alarm triggering during an intrusion.
I changed the patterns of the tripwire IVS rules (tried some Z patterns). No improvement.
I changed the camera setting from VBR to CBR. Idem
I defaulted the camera settings. Idem.

At the end of the day I did my 10000 steps (mostly running) :) and now with all these tentatives even the camera triggers the alarm after a long walk in the perimeter. At this hour the daylight is over but we have reasonable street lighting.

Well tomorrow is another day. I'll try maybe the SMD+ Who knows...

Regards,
 
[QUOTE="Matrix said:
Thank you works spot on now that been driving me up the wall not being able to find it past few days !

Well happy with the cameras etc , I still have that package ?
Click to expand...

Are you aware of the two-way speech function? From the phone app you can speak to people over the camera.
 
Nitron said:
If my understanding is correct in order to do that I have to change the physical field of view of the camera and then to mask the public part of the view.
To do that I'll have to get again on the roof so for the moment I tried the other options:)

I reduced gradually the resolution to 1080 pts. No luck.
I increased the frame rate from 15 to 20 fps (max). No luck.
I kept only one IVS rule (perimeter). Same. I cannot get a sistamatic alarm triggering during an intrusion.
I changed the patterns of the tripwire IVS rules (tried some Z patterns). No improvement.
I changed the camera setting from VBR to CBR. Idem
I defaulted the camera settings. Idem.

At the end of the day I did my 10000 steps (mostly running) :) and now with all these tentatives even the camera triggers the alarm after a long walk in the perimeter. At this hour the daylight is over but we have reasonable street lighting.

Well tomorrow is another day. I'll try maybe the SMD+ Who knows...

Regards,
Click to expand...

I’m really sorry. I’ll get a hold of my contact at Dahua UK technical on Monday morning and see if they can suggest something but I don’t believe there are any adjustments to IVS.

Which camera do you have - 5MP or 8MP?
 
Hi WJA96,

Thank You for contacting Dahua on the itruder detection reliability.

In order to help find a solution please find enclosed a photo made by the camera of its real field of view.
The camera is 5Mpx. In the view a "human" can be seen in order to have an idea of the area. I volutarily blurred the human for privacy reasons.

HtSCpg3
 
Last night I activated the SMD+ filtering for humans with "Medium" sensitivity.
The camera still misses some intrusions (me running on the alley) but now I have some false alarms generated by birds and cats (at 6-10m distance from the camera lens).
 
And you want to capture someone running up the path on the left side of the image?

And on the intrusion rules you have set ‘cross and appear’ and not just ‘cross’?

And there is no time limit set in the period setting? It’s on all the time?
 
Nitron said:
Last night I activated the SMD+ filtering for humans with "Medium" sensitivity.
The camera still misses some intrusions (me running on the alley) but now I have some false alarms generated by birds and cats (at 6-10m distance from the camera lens).
Click to expand...

It makes you realise just how good IVS is.
 
Yes, the left path is my biggest priority. Of course I'll be very happy to cover all the front fence against intrusions.
And yes I set "cross and appear" on both intrusion rules. And I activated the human filter.
The period setting is the default one (no exclusions).
pJbF0NJ
 
You must log in or register to reply here.
Back
Top Bottom