Opencv has a lot of useful functions.
Show image/video stream
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| while True:
cv2.imshow(img)
cv2.waitKey(1)
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Color Space Convert
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| gray_img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
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Histogram and Backprojection
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| hist = cv2.calcHist([img], [0, 1], None, [180, 256], [0, 180, 0, 256])
mask = cv2.calcBackProject([target], [0, 1], hist, [0, 180, 0, 256], 1)
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Otsu threshold
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| _, mask = cv2.threshold(img[:, :, 1], 0, 255, cv2.THRESH_BINARY | cv2.THRESH_OTSU)
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Geometric
Contour of images
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| _, contours, _ = cv2.findContours(mask, cv2.RETR_CCOMP, cv2.CHAIN_APPROX_SIMPLE)
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Convex Hull and Convex Defect
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| hull = cv2.convexHull(contour, returnPoints=False)
defects = cv2.convexityDefects(contour, hull)
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