VEHICLE'S ORIENTATION MEASUREMENT METHOD BY SINGLE-CAMERA IMAGE USING KNOWN-SHAPED PLANAR OBJECT

摘要

This paper describes the development of a vehicle's orientation (3D distance and direction) measurement system using a single camera. We propose a new approach for measuring both 3D distance and direction from a camera to a vehicle using its license plate image. The key technique of this approach is based on a single camera calibration method by using a planar pattern. With this method, the orientation from camera to planar object can be obtained using more than four feature coordinates on the camera image of a known-sized planar object. We thus calculate a vehicle's orientation using its license plate image as the planar object. The license plate's corner points necessary to calculate orientation are tracked by an active contour tracking method. The effectiveness of our proposed method has been verified through experiments using real vehicle images.