Put FOUR image (or video stream )from 4 different directions together, and form them into a bird view by pointing out 4 corner in 4 direc pic.
I have four imgs, such as(from up to down: left, forward, right, backward)
using this programe, we can get
Meanings of functions from this Class BirhView are shown as figure follow:
Before using this API Class, be awared you have had known that accurated measure is need for better visual effect and making image be exact
Before birdEye transform, Calibration of camera is needed! here is a link for calibration.