IntelligentCar_p1.cpp

Mat3b img = imread(argv[1]);                 //Load image 
Rect roi(0, 420, img.cols, img.rows - 500);  //Setup a rectangle to define region of interest
Mat3b img_crop = img(roi);                   //Crop the full image to rectangle ROI 
Mat img_gray;
cvtColor(img_crop, img_gray, CV_BGR2GRAY);   //Convert image to gray
//Show results
imshow("Original", img);
imshow("Crop", img_crop);
imshow("Gray", img_gray);