cv2.error: OpenCV(4.9.0) :-1: error: (-5:Bad argument) in function ‘rectangle‘

  File "D:\Code\GhostFaceNets\facenet-retinaface-pytorch-main\retinaface.py", line 460, in detect_image
    cv2.rectangle(old_image, (b[0], b[1]), (b[2], b[3]), (0, 0, 255), 2)
cv2.error: OpenCV(4.9.0) :-1: error: (-5:Bad argument) in function 'rectangle'
> Overload resolution failed:
>  - img marked as output argument, but provided NumPy array marked as readonly
>  - Expected Ptr<cv::UMat> for argument 'img'
>  - img marked as output argument, but provided NumPy array marked as readonly
>  - Expected Ptr<cv::UMat> for argument 'img'

cv2.rectangle(old_image, (b[0], b[1]), (b[2], b[3]), (0, 0, 255), 2)

在调试facenet+retinaface时，检测一张图像中多张人脸时出现以上问题。在网上搜了很多，最终选择询问李博士。

解决方法：

old_image = np.int32(old_image)
cv2.rectangle(old_image, (b[0], b[1]), (b[2], b[3]), (0, 0, 255), 2)

成功解决。