Chapter 7

1. OpenCV code to detect objects with yellow color from a video is as follows: Note that the boilerplate code is not repeated here.

cuda::cvtColor(d_frame, d_frame_hsv, COLOR_BGR2HSV);

//Split HSV 3 channels
cuda::split(d_frame_hsv, d_frame_shsv);

//Threshold HSV channels for Yellow color
cuda::threshold(d_frame_shsv[0], d_thresc[0], 20, 30, THRESH_BINARY);
cuda::threshold(d_frame_shsv[1], d_thresc[1], 100, 255, THRESH_BINARY);
cuda::threshold(d_frame_shsv[2], d_thresc[2], 100, 255, THRESH_BINARY);

//Bitwise AND the channels
cv::cuda::bitwise_and(d_thresc[0], d_thresc[1],d_intermediate);
cv::cuda::bitwise_and(d_intermediate, d_thresc[2], d_result);
d_result.download(h_result);
imshow("Thresholded Image", h_result); 
imshow("Original", frame);

2. When the color of an object is the same as the color of background, then color based object detection will fail. If there...