Links for all image detection methods I tried in OpenCV

Links for all the methods:

Template Matching: https://docs.opencv.org/master/d4/dc6/tutorial_py_template_matching.html
Haar Cascades: https://docs.opencv.org/3.4/db/d28/tutorial_cascade_classifier.html
Hough Lines: https://www.geeksforgeeks.org/line-detection-python-opencv-houghline-method/
Arithmetic Operations on Images: https://docs.opencv.org/3.4/dd/d4d/tutorial_js_image_arithmetics.html