If that ISP inside the camera module is generally AE Exposure default exposure time priority, motion blur problem can occur when capturing moving objects, and for facial capture machine, high-quality facial images for subsequent face detection, face recognition, etc. function has a significant impact.
The content is presented in Figure "digital photography practice" in a book made for motion blur problems instructive.
In practical tests, lack of room light exposure in accordance with the default policy (to adjust the exposure time ET, ET = 40ms after exposure amount of the screen is still not the case, the gain value, the strategy is to reduce the noise) Exposure time ET about 35ms, capture a pedestrian, when a camera to capture the distance (6mm focal length) of about 2 meters per pedestrian line motion blur occurs, the pedestrian 2 meters outside the basic motion blur does not occur;
adjusted to 10ms ET manually, increasing the gain later, the same capture pedestrian, the pedestrian when the distance from the camera (6mm focal length) of about 2 m to capture motion blur occurring pedestrian will be improved, but for people to walk or slightly faster motion blur;
adjusted manually to 8ms ET , to capture pedestrian motion blur does not occur again (based on the current test set), the data corresponding 8ms 1 / 125s mentioned in the book, is the same;
So for the capture of moving objects, to minimize exposure time, otherwise there is motion blur, of course, to have a motion blur algorithm can also be processed.