Abstract
The security warning system need to be real-time and far detection distance. In this article, we use the method of the camera calibration in surface which is based on the method of direct Linear Transformation, and which is simple calculation and can meet the needs of the long distance detection. And on the basis of the existing methord of monocular distance measure, we improved the method which can range in safety warning only using the monocular vision to calculate the distance between the vehicle and the pedestrian who is in front of the car.
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