Only for learning, all the images from http://www.cvlibs.net/datasets/kitti/eval_road.php
detail on https://www.learnopencv.com/histogram-of-oriented-gradients/
Histogram of one window
Sobel filter
More details on paper: Levinson, Jesse , and S. Thrun . "Automatic Online Calibration of Cameras and Lasers." Robotics: Science and Systems 2013 2013.
Origin image:
After: