IR leds switch triggers motion detection


#1

I have a FOSCAM FI9821P with auto ir leds switch.

Every time ir leds are turned on or off by the camera, a motion is detected, regardless of my settings :

  • Motion Algorithm : BlobDetection
  • Motion Display : Blob
  • Motion Sensibility : VeryLow
  • Threshold : 10

Is there a way to prevent this ?


#2

Hi!. Is there an object close to the camera that reflects a lot of IR light back to the camera?


#3

No. There is no object close to the camera.

It seems that the global change in luminosity triggers the detection.


#4

Ok. Change to lowest sensitivity and max threshold and cover the lens. I wouöd like to test if it is an electricsl problem in the cam. Is it the same problem with another motion algorithm?


#5

Here are the results of my tests :

  • With motion sensibility on VeryLow and threshold on 100, motion is not detected when switching from day vison to night vision and vice versa, whatever motion algorithm I choose. But with these settings, nothing is detected except close to the camera
  • Every value lower than 100 for threshold causes a detection for any motion algorithm
  • If I cover the lens, no detection occurs
  • When I use the camera motion detection software, IR Led switching does not trigger detection, even in High sensibility

#6

I searched on this problem and found this ( more links with this problem)
http://foscam.us/forum/noisey-image-dusk-dawn-false-triggers-motion-detection-t12444.html
In NCS switch to the view where you can see what cause the motion detection to trigg. That will give you additional info.


#7

I know exactly what casuses motion detection and I can see it clearly on the recorded video : it is a sudden change in luminosity, contrast and color of the whole image due to switching from night vision (IR leds on) to day visdion (IR leds off and vice versa).

I think that, along with a minimum thre’shold, there should be a maximum threshold (as in Blue Iris) to insure that a change in every pixel of the view does not trigger motion detection.


#8

I will forward your suggestion to the developers. For me the question is then how to differ this camera behavior from someone pointing a flash light or an IR light into the camera.
The behavior of the camera that you describe is for me very strange. I would return it or change to anotherr brand.