Real time shape detection – Opencv with Python 3

In this video tutorial we’re going to see how to detect shapes of geometric figures (like rectangles, triangles and circles) in a live video. Source code: import cv2 import numpy as np def nothing(x): # any operation pass cap = cv2.VideoCapture(1) cv2.namedWindow(“Trackbars”) cv2.createTrackbar(“L-H”, “Trackbars”, 0,…

Fourier Transform – OpenCV 3.4 with python 3 Tutorial 35

Source code: import cv2 import numpy as np import glob list_images = glob.iglob(“letters/*”) for image_title in list_images: img = cv2.imread(image_title, cv2.IMREAD_GRAYSCALE) f = np.fft.fft2(img) fshift = np.fft.fftshift(f) magnitude_spectrum = 20*np.log(np.abs(fshift)) magnitude_spectrum = np.asarray(magnitude_spectrum, dtype=np.uint8) img_and_magnitude = np.concatenate((img, magnitude_spectrum), axis=1) cv2.imshow(image_title, img_and_magnitude) cv2.waitKey(0) cv2.destroyAllWindows()   Files:…

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