在OpenCV中旋转屏幕时,屏幕看起来像是向左上推的

窗户的右边和底部有大约3厘米的空间。看起来屏幕被推开了。我将屏幕旋转到参考位置 this page .

这是一张照片

import cv2 

cap = cv2.VideoCapture(0) #return 0 or -1
while cap.isOpened():
    ret, img = cap.read()
    h,w = img.shape[:2]
    center =  (w/2, h/2)
    M = cv2.getRotationMatrix2D(center, 90, 1)
    img = cv2.warpAffine(img, M, (h, w)) 
    #flip the image vertically
    img = cv2.flip(img, 1)


    if cv2.waitKey(1)&0xFF == ord('q'): 
        break 
    if not ret: 
        print('no camera connected!') 

    cv2.imshow('camera-0', img)
cap.release()
cv2.destroyAllWindows()