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I can't draw the contour approximation, I use a green square to take the video but no contour on it.

import cv2
import time
import numpy as np
import picamera.array import PiRGBArray
from picamera import PiCamera

#Initialize PiCamera
camera = PiCamera()
camera.resolution = (352,288)
camera.framerate = 32
rawCapture = PiRGBArray(camera)
time.sleep(0.1)

 #Take video
for frame in camera.capture_continuous(rawCapture, format=('bgr'), use_video_port = True):
     frame = frame.array
     rows, cols , _ = frame.shape

     #Rotate the video   
     M = cv2.getRotationMatrix2D((cols/2,rows/2), 180, 1)
     dst = cv2.warpAffine(frame, M, (cols,rows))
     #Recognize the green color
     hsv  = cv2.cvtColor(dst, cv2.COLOR_BGR2HSV)
     lower_green = np.array([50, 50, 50])
     upper_green = np.array([70, 255, 255])
     mask = cv2.inRange(hsv, lower_green, upper_green)
     #Contour
     ret, thresh = cv2.threshold(mask, 127, 255, 0)
     contours, hierarchy = cv2.findContours(thresh, 1, 2)
     cnt = contours[0]
     epsilon = 0.1*cv2.arcLength(cnt, True)
     approx = cv2.approxPolyDP(cnt, epsilon, True)
     for c in aprox:
          thresh = cv2.drawContours(thresh, [c], -1, (0,255,0), 3)

     #Show images
     cv2.imshow('Tracking', thresh)
     cv2.imshow('Video', dst)
     rawCapture.truncate(0)

     k = cv2.waitKey(5) & 0xFF

     if k == 27:
          break
cv2.destroyAllWindows()

I can't draw the contour approximation, I use a green square to take the video but no contour on it.

import cv2 import time import numpy as np import picamera.array import PiRGBArray from picamera import PiCamera PiCamera #Initialize PiCamera camera = PiCamera() camera.resolution = (352,288) camera.framerate = 32 rawCapture = PiRGBArray(camera) time.sleep(0.1) #Take video for frame in camera.capture_continuous(rawCapture, format=('bgr'), use_video_port = True): frame = frame.array rows, cols , _ = frame.shape #Rotate the video M = cv2.getRotationMatrix2D((cols/2,rows/2), 180, 1) dst = cv2.warpAffine(frame, M, (cols,rows)) #Recognize the green color hsv = cv2.cvtColor(dst, cv2.COLOR_BGR2HSV) lower_green = np.array([50, 50, 50]) upper_green = np.array([70, 255, 255]) mask = cv2.inRange(hsv, lower_green, upper_green) #Contour ret, thresh = cv2.threshold(mask, 127, 255, 0) thr = cv2.cvtColor(thresh, cv2.COLOR_GRAY2BGR) contours, hierarchy = cv2.findContours(thresh, 1, 2) cnt = contours[0] epsilon = 0.1*cv2.arcLength(cnt, True) approx = cv2.approxPolyDP(cnt, epsilon, True) for c in aprox: thresh = cv2.drawContours(thresh, [c], -1, (0,255,0), 3) #Show images cv2.imshow('Tracking', thresh) cv2.imshow('Video', dst) rawCapture.truncate(0) k = cv2.waitKey(5) & 0xFF if k == 27: break cv2.destroyAllWindows()

          3    None 
      updated 
        2019-01-31 09:16:03 -0600
     
 
 
  
 
 
 
  I can't draw the contour approximation, I use a green square to take the video but no contour on it.
 import cv2
    import time
    import numpy as np
    import picamera.array import PiRGBArray
    from picamera import PiCamera
 #Initialize PiCamera
camera = PiCamera()
camera.resolution = (352,288)
camera.framerate = 32
rawCapture = PiRGBArray(camera)
time.sleep(0.1)

 #Take video
for frame in camera.capture_continuous(rawCapture, format=('bgr'), use_video_port = True):
     frame = frame.array
     rows, cols , _ = frame.shape

     #Rotate the video   
     M = cv2.getRotationMatrix2D((cols/2,rows/2), 180, 1)
     dst = cv2.warpAffine(frame, M, (cols,rows))
     #Recognize the green color
     hsv  = cv2.cvtColor(dst, cv2.COLOR_BGR2HSV)
     lower_green = np.array([50, 50, 50])
     upper_green = np.array([70, 255, 255])
     mask = cv2.inRange(hsv, lower_green, upper_green)
     #Contour
     ret, thresh = cv2.threshold(mask, 127, 255, 0)
     thr = cv2.cvtColor(thresh, cv2.COLOR_GRAY2BGR)
     contours, hierarchy = cv2.findContours(thresh, 1, 2)
     cnt = contours[0]
     epsilon = 0.1*cv2.arcLength(cnt, True)
     approx = cv2.approxPolyDP(cnt, epsilon, True)
     for c in aprox:
          thresh = cv2.drawContours(thresh, [c], -1, (0,255,0), 3)

     #Show images
     cv2.imshow('Tracking', thresh)
     cv2.imshow('Video', dst)
     rawCapture.truncate(0)

     k = cv2.waitKey(5) & 0xFF

     if k == 27:
          break
cv2.destroyAllWindows()
 
 
 
          4    None 
      updated 
        2020-04-09 14:27:52 -0600
     
    supra56  
 943  ●9 ●6  
 
 
 
  
 
 
 
  I can't draw the contour approximation, I use a green square to take the video but no contour on it.
 Code:   
 import cv2
 import time
 import numpy as np
 import picamera.array import PiRGBArray
 from picamera import PiCamera
 PiCamera

#Initialize PiCamera
camera = PiCamera()
camera.resolution = (352,288)
camera.framerate = 32
rawCapture = PiRGBArray(camera)
time.sleep(0.1)

 #Take video
for frame in camera.capture_continuous(rawCapture, format=('bgr'), use_video_port = True):
     frame = frame.array
     rows, cols , _ = frame.shape

     #Rotate the video   
     M = cv2.getRotationMatrix2D((cols/2,rows/2), 180, 1)
     dst = cv2.warpAffine(frame, M, (cols,rows))
     #Recognize the green color
     hsv  = cv2.cvtColor(dst, cv2.COLOR_BGR2HSV)
     lower_green = np.array([50, 50, 50])
     upper_green = np.array([70, 255, 255])
     mask = cv2.inRange(hsv, lower_green, upper_green)
     #Contour
     ret, thresh = cv2.threshold(mask, 127, 255, 0)
     contours, hierarchy = cv2.findContours(thresh, 1, 2)
     cnt = contours[0]
     epsilon = 0.1*cv2.arcLength(cnt, True)
     approx = cv2.approxPolyDP(cnt, epsilon, True)
     for c in aprox:
          thresh = cv2.drawContours(thresh, [c], -1, (0,255,0), 3)

     #Show images
     cv2.imshow('Tracking', thresh)
     cv2.imshow('Video', dst)
     rawCapture.truncate(0)

     k = cv2.waitKey(5) & 0xFF

     if k == 27:
          break
cv2.destroyAllWindows()