Motion detection detects motion outside deffined zone

[DR_Omi]

Hi,

Zoneminder 1.37.66 Ubuntu 24.04

I have defined "activ" zone on the right side of the scene but ZM detects motion which take place on the left side of the scene.
I tried deleting the zone and creating new one in the same area. The same happens.
No problem when zone is from left to the right or in the middle of the camera picture.

[iconnor]

We have one other report of this. I havn't been able to reproduce it though.

[IgorA100]

Yes, sometimes it happens.
But I couldn't find the reason, because it's impossible to repeat....

[iconnor]

I am working on bringing back live analysis highlighting... which may help.

Most of this code has not been touched in 10 years and could certainly do with some test cases.

[IgorA100]

I am working on bringing back live analysis highlighting..

This is great!

[DR_Omi]

Hi,

In my case it's permanent on two cameras:
Dahua model IPC-HFW2320R-VFS-IRE6



Cars are passing in a red highlighted part of the image, right up corner.
When car is passing activ zone Z2a detects motion on the left side. Other zones are set inactiv.

looks like image is flipped y axis before analysis.

In Source tab:
Orientation = Normal
Decoder = Auto

all manual Decoder settings has the same "flipped y" effect

[Fressikus]

Adding on to this that I have the same problem and had for a while. For me, cars are passing by the only defined zone (both on the left side of the image) and getting blob detected anyway. For me, it's on an 640x480 lowres RTSP stream from a Reolink Webcam. I've also tried deleting all zones and re-adding them, to no avail. I'll add some screenshots to showcase the issue, please let me know if I can do anything else to help pinpoint the problem.

[iconnor]

I'm a little swamped. Had intended to release 1.38 next week. I will delay it in order to ensure this is fixed first.

[Bluemax]

Try to lookup/verify the zones:
- enable jpg analysis frames
- Trigger a max-motion picture (by camera) e.g. by changing day/night mode (hikvision). This will create a white flash on every switch that will trigger every active pixel/blob so the analysis frames should show a pixelcloud of the true areas. Compare it with the originally defined areas.

[Bluemax]

Here is another example.

[DR_Omi]

good tip Bluemax with the camera day night switching

This is my zone with parameters and detected area (pixel / blob)

[Fressikus]

I've flipped my image horizontally in the camera to simulate an "all pixels changed" situation and got this:

zones1.jpg (257.3 KiB) Viewed 8073 times

zones2.jpg (281.56 KiB) Viewed 8073 times

Kinda looks like it's drawing lines where it should not or something

points_configuration.jpg (71.52 KiB) Viewed 8073 times