A camera behind a window prevents outdoor mounting, but the glass becomes part of the image setup. During the day, the recording may appear usable while lamps or the window's own infrared lighting reflect back in the evening. Therefore, test the full usage situation.
View the desired outdoor zone while the room is being used normally. Turn on and off the existing indoor lights during the test and check what is reflected in the window. Let someone walk outside through the target area. A static daytime image tells little about recognizability during an evening with a lit room.
The infrared light from the camera can reflect back to the lens through the glass. If the model supports separate control of that lighting, briefly compare the image with and without it. Please note that turning it off does not illuminate the outdoor area: the target must still be sufficiently visible.
Do not assume that all sensors or detection methods work the same way through a window. Use the model's manual and test the actual event. Check whether the recording is made and the intended alert arrives. When providing a quote, specify which functions in this setup have been tested.
Curtains, blinds, an open window and items on the windowsill can change the view. Choose a stable spot and assess whether daily use frees up that area. A movable camera should be rechecked if someone has moved it.
If reflection or shielding continues to obstruct the target, then investigate external mounting or another line of sight. A camera behind glass does not need to be made suitable with increasingly many settings if the optical situation does not suit. Keep day and night examples to support that choice.
The ratio between indoor and outdoor light changes, and your own night lighting can reflect off the window.
You should not assume that. Check the type of sensor used and test the function with the specific device.
