Digital Watchdog MEGApix DWC-MTT4WiA User Manual page 29

For more accuracy, here are some recommendations for installation.
Cameras should be installed on stable surfaces, as vibrations can affect the
accuracy of detection.
Avoid pointing the camera at the reflective surfaces (like shiny floors, mirrors,
glass, lake surfaces and so on).
Avoid places that are narrow or have too much shadowing.
Avoid scenario where the object's color is similar to the background color.
At any time of day or night, please make sure the image of the camera is clear
and with adequate and even light, avoiding overexposure or too much darkness
on both sides.