A. cv2.rectangle(img,(50,50),(100,200),(255,255,255),2) B. cv2.rectangle(img,(50,50),(100,200),(0,0,0),2) C. cv2.rectangle(img,(50,50),(100,100),(255,255,255),2) D. cv2.rectangle(img,(50,50),(100,100),(0,0,0),2)
A. (0,400) B. (0,399) C. (400,0) D. (399,0)
A. img[0:200,-300:-1,:] B. img[0:200,-300:-1,3] C. img[0:200,0:300,:] D. img[0:200,0:300,3]
A. a是红色,b是绿色,c是蓝色 B. a是绿色,b是红色,c是蓝色 C. a是蓝色,b是绿色,c是红色 D. a是红色,b是蓝色,c是绿色
A. b = (0,0,255) B. b = (0,255,0) C. b = (255,255,0) D. b = (0,255,255)