Learn opencv in Bangla_1(What is opencv and how to install opencv)

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Playing a video from file with color BGR, RGB, GRAY, HSV in OpenCV

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import cv2 capture = cv2.VideoCapture( 'video_1.mp4' ) while True : ret , frame = capture.read() gray = cv2.cvtColor(frame , cv2.COLOR_BGR2GRAY) HSV = cv2.cvtColor(frame , cv2.COLOR_BGR2HSV) RGB = cv2.cvtColor(frame , cv2.COLOR_BGR2RGB) cv2.imshow( 'Normal plus BGR' , frame) cv2.imshow( 'Gray' , gray) cv2.imshow( 'HSV' , HSV) cv2.imshow( 'RGB' , RGB) if cv2.waitKey( 1 ) == 27 : break cv2.destroyAllWindows()
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how to Create a Black Image in OpenCV

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#hellow everyone today i am going to show you #how to create a black image in opencv #first import opencv and numpy import cv2 import numpy as np #creating black image #width of the image width = 700 #height of the image height = 600 Black_image = np.zeros( (width , height) , dtype =np.uint8) #displaying image untill press ESC button while True : cv2.imshow( 'window' , Black_image) if cv2.waitKey( 1 ) == 27 : break cv2.destroyAllWindows()
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How draw Line, Rectangle, Circle, Triangle, and write text in openCV.

import cv2 import numpy as np black_image = np.zeros(( 600 , 800 , 3 ) , np.uint8) cv2.line(black_image , ( 0 , 0 ) , ( 800 , 600 ) , ( 255 , 0 , 0 ) , 3 ) cv2.rectangle(black_image , ( 0 , 0 ) , ( 300 , 400 ) , ( 255 , 0 , 0 ) , 3 ) cv2.circle(black_image , ( 400 , 300 ) , 100 , ( 255 , 0 , 0 ) , 2 ) cv2.circle(black_image , ( 200 , 150 ) , 100 , ( 255 , 0 , 0 ) , - 1 ) pts = np.array([[ 0 , 600 ] , [ 800 , 600 ] , [ 400 , 300 ]]) cv2.polylines(black_image , [pts] , True, ( 255 , 255 , 0 ) , 2 ) font = cv2.FONT_HERSHEY_SIMPLEX cv2.putText(black_image , 'you are best' , ( 0 , 300 ) , font , 4 , ( 0 , 255 , 0 )) while True : cv2.imshow( 'window' , black_image) if cv2.waitKey( 1 ) == 27 : break cv2.destroyAllWindows()
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