Help and Advice in Setting Up Movement Detection
Hi. Any help greatly appreciated. Love the software but i just cant get it to capture movement for all the area on one of my cameras. To set the scene the image is made up of 2 thirds from the bottom is garden then there is a fence and then tarmac with garage and cars in the top third of the image. When i set it to capture movement it seems fine with the bottom 2 thirds if anything moves but if you walk up to the car part of the garden it seems to stop detection in the car area. This includes the cars actually moving which seems fundamental to me. I have increased the sensitivity and masked out some trees to avoid them causing any movement but this still seems to let all hell break loose and i end up with many videos for minor movements to compensate to get the car movement detected? Am i missing something? I have got friends / family to walk up the garden and when the sensitivity is at 50 sure enough as soon as the person enters the car area it stops detection. Out of interest how does the camera detect movement as i realise that the movement at the top of the camera is smaller as it is further away but it seems wrong to have to increase the sensitivity especially for a car moving as an example? Thanks again.
Comments
- Counts changes in pixels between the current frame and previous one
- Automatically adjusts sensitivity based on measurements of the amount of noise in the video stream, which is constantly updated
- If enabled ("trigger time" setting), monitors these pixel changes over 1 or 2 seconds, and uses all the information gathered during this time period to decide whether to trigger.
In most circumstances this gives good results, with a low false-negative and low false-positive rate. However it is designed to err on the side of more false-positives, in order not to miss out on any important motion is should be capturing. This will especially be the case if the camera is situated outside pointing at areas of moving plants/shadows etc. Make sure the camera is angled downwards (so as not to capture trees/sunlight/clouds), and use the mask feature to ignore any problem areas.
Hope this helps!
One thing we have is that the cameras record lots every dawn. My impression is the camera is adjusting the exposure back and forth a bit before it stabilises. This leads to a lot of video being recorded. For the foliage and shadows, we've done what we can, but it's still a pretty massive problem. Either we get ~50 videos per 24 hours, or we have it set so that it doesn't detect anyone at night.
Hence the need to get a separate motion sensor (though I've not found anything I like the look of yet!)
You can mitigate the second issue to some degree by installing better lighting around the camera at night. We are also working on this issue from our end by looking at automatic sunrise/sunset detection and auto-adjusting the motion detection parameters based on that.
That would be great!
Cheers,
Ed
I was wondering if you could allow for a feature to permit a 3 or even 4 second trigger time. I have been watching the motion activity and in most cases 3 seconds would cover the light changes with sun / cloud / passing cars e.c.t