You're going to have a certain degree of control (most likely determined by your camera). Unfortunately cameras are typically non-deterministic so even when you're doing a snap, you're not getting a precise timing schema. Different cameras give you different degrees of control. For instance, my camera (silly 20$ USB webcam) allows grab modes of 15fps or 30fps depending on resolution. This isn't precise but it works about +-10% accuracy. You can then pull images from that stream as desired. You can also look into Real-Time systems we have (maybe take a look at our Smart Cameras) for a deterministic method.
