cv2.error：OpenCV（4.5.3）出现在树莓派中

Question

我尝试使用 Raspberry Pie 使用下面的代码测试 Picam。

import cv2

def main():
    camera = cv2.VideoCapture(-1)
    camera.set(3,640)
    camera.set(4,480)
    
    while( camera.isOpened() ):
        _, image = camera.read()
        cv2.imshow( 'camera test' , image)
        
        if cv2.waitKey(1) == ord( 'q '):
            break
        
    cv2.destroyAllWindows()
    
if __name__ == '__main__':
    main()

但是，会出现此错误。

        cv2.error: OpenCV(4.5.3) /tmp/pip-wheel-hwcmjluw/opencv-
python_dc56ddd000dd4893b1f852d88d4a5959/opencv/modules/core/src/arra
y.cpp:2494:error: (-206:Bad flag (parameter or structure field)) 
Unrecognized orunsupported array type in function 'cvGetMat'

我应该怎么办？

Answer 1

OpenCV 不喜欢 ord( 'q ') 中的空格。我正在使用 OpenCv 4.5.5/Bullseye。使用 picamera v1.它将起作用 picamera v2.import cv2

import cv2

def main():
    camera = cv2.VideoCapture(-1)
    camera.set(3,640)
    camera.set(4,480)
    
    while(camera.isOpened()):
        _, image = camera.read()
        cv2.imshow('camera test' , image)
        if cv2.waitKey(1) == ord('q'):# esc Key  
            break 
         
    cv2.destroyAllWindows()
    
if __name__ == '__main__':
    main()