寫在前面的話：文章內(nèi)容來源于但不限于網(wǎng)絡(luò)、書籍、個人心得體會等，意在總結(jié)和方便各位同行快速參考，共同學(xué)習(xí)進(jìn)步，記錄自己的問題。錯誤在所難免，有請各位批評斧正 。 如有侵權(quán)，煩請第一時間通知，我會立即刪除相關(guān)內(nèi)容，萬分感謝！??

            
              import numpy as np 
import argparse
import time
import cv2 

# construct the argument parse and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-v", "--video",
	help = "path to the (optional) video file")
args = vars(ap.parse_args())

# define the upper and lower boundaries for a color
# to be considered "blue"
blueLower = np.array([100,67,0],dtype="uint8")
blueUpper = np.array([255,128,50],dtype="uint8")

# load the video
if not args.get("video"):
    camera = cv2.VideoCapture(0)
else:
    camera = cv2.VideoCapture(args["video"])

# keep looping 
while True:
    # grab the current frame 
    (grabbed,frame) = camera.read()

    # check to see if we have reached the end of the video
    if not grabbed:
        break 
    
    # determine which pixels fall within the blue boundaries
    # and then blur the binary image
    blue = cv2.inRange(frame,blueLower,blueUpper)
    blue = cv2.GaussianBlur(blue,(3,3),0)

    # find contours in the image 
    (_,cnts,_) = cv2.findContours(blue.copy(),cv2.RETR_EXTERNAL,
        cv2.CHAIN_APPROX_SIMPLE)
    
    # check to see if any contours were found
    if len(cnts) > 0:
        # sort the contours and find the largest one --
        # we will assume this contour coorespondes to the 
        # area of my phone 
        cnt = sorted(cnts,key=cv2.contourArea,reverse=True)[0]

        # compute the (rotated) bounding box around then 
        # contour and then draw it 
        rect = np.int32(cv2.boxPoints(cv2.minAreaRect(cnt)))
        cv2.drawContours(frame,[rect],-1,(0,255,0),2)
    
    # show the frame and the binary image
    cv2.imshow("Traccking",frame)
    cv2.imshow("Binary",blue)

    # if your machine is fast, it may display the frames in
	# what appears to be 'fast forward' since more than 32
	# frames per second are being displayed -- a simple hack
	# is just to sleep for a tiny bit in between frames;
	# however, if your computer is slow, you probably want to
	# comment out this line
    time.sleep(0.025)

	# if the 'q' key is pressed, stop the loop
    if cv2.waitKey(1) & 0xFF == ord("q"):
	    break

# cleanup the camera and close any open windows
camera.release()
cv2.destroyAllWindows()
            
          

?