A.cv2.calcHist([img],[0],None,[256],[0,256])B.plt.hist(img.ravel(),256,[0,256])C.cv2.equalizeHist(img)D.cv2.histogram(img)
A.cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)B.cv2.cvtColor(img,cv2.COLOR_BGR2HSV)C.cv2.cvtColor(img,cv2.COLOR_GRAY2BGR)D.cv2.cvtColor(img,cv2.COLOR_HSV2BGR)
A.cap =cv2.VideoCapture(’video.mp4’)B.ret,frame =cap.read()C.cv2.VideoWriter(’output.avi’,cv2.VideoWriter_fourcc(*’XVID’),20.0,(640,480))D.cv2.imread(’video.mp4’)