cv2.error：OpenCV（4.1.0）错误：（-215：断言失败）在函数'cv :: Mat :: locateROI'中使<= 2 && step [0]> 0变暗

Question

使用Dlib和OpenCV检测到人脸后，我试图使其模糊，但出现此错误

我该如何解决？

frame [x1：y1，x2：y2] = cv2.blur（frame [x1：y1，x2：y2]，（23，23）） cv2.error：OpenCV（4.1.0）C：\ projects \ opencv-python \ opencv \ modules \ core \ src \ matrix.cpp：757：error：（-215：Assertion failed）dims <= 2 && step [0 ]> 0在功能'cv :: Mat :: locateROI'

for face in faces:
    x1 = face.left()
    y1= face.top()
    x2= face.right()
    y2= face.bottom()
    cv2.rectangle(frame,(x1,y1),(x2,y2),(0,255,0),2)
    frame[x1:y1, x2:y2]=cv2.blur(frame[x1:y1, x2:y2], (23, 23))

#    anonymize_face_pixelate(image=facee,blocks=3)
    cv2.putText(frame, "Dlib detector", (x1, y2), cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 255,0))
    landmarks=predictor(gray, face)