4 comments

1. hi sergio
   my name ist mustafa im a student in germany and i have projekt with opencv. I saw your Tutorial 12 and would like to ask you how i can do the same with cv2.videocapture(0) .
   i would appreciate it if you could help me with this.

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   1. Hi Mustafa,
      it’s easy. It works in the same way but inside a loop, as for a video you need to process frame by frame.

      Here is the code for a video:

      [python]
      import cv2
      import numpy as np

      cap = cv2.VideoCapture(0)

      # Git first frame to take the size of frame
      _, frame = cap.read()
      rows, cols, ch = frame.shape

      print("Height: ", rows)
      print("Width: ", cols)

      while True:
      _, frame = cap.read()
      scaled_img = cv2.resize(frame, None, fx=1 / 2, fy=1 / 2)

      matrix_t = np.float32([[1, 0, -100], [0, 1, -30]])
      translated_img = cv2.warpAffine(frame, matrix_t, (cols, rows))

      matrix_r = cv2.getRotationMatrix2D((cols / 2, rows / 2), 90, 0.5)
      rotated_img = cv2.warpAffine(frame, matrix_r, (cols, rows))

      cv2.imshow("Original image", frame)
      cv2.imshow("Scaled image", scaled_img)
      cv2.imshow("Translated image", translated_img)
      cv2.imshow("Rotated image", rotated_img)

      key = cv2.waitKey(1)
      if key == 27:
      break

      cap.release()
      cv2.destroyAllWindows()
      [/python]

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2. Hi,
   part of my final project to software engineer study we need to calculate Plant area.
   we need to take photo of the plant each day, and calculate the area to check the Growth of the Plant.
   do you have ant solution for me please..?
   Thanks.

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   1. Hi Hanan, it seems a simple task to achieve.
      You could create a mask by the color of the plant (you can see here how https://www.youtube.com/watch?v=SJCu1d4xakQ) and then calculate the area of the white part in the mask.

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