case study 00
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用到的函数
cv2.findContours
np.uint8
cv2.drawContours
cv2.Canny
更多的参考：
Target acquired: Finding targets in drone and quadcopter video streams using Python and OpenCV
Measuring size of objects in an image with OpenCV
Detecting machine-readable zones in passport images
Detecting Barcodes in Images with Python and OpenCV
How to Build a Kick-Ass Mobile Document Scanner in Just 5 Minutes
