Matlab vision.ObjectDetector到Python

我有一个Matlab代码，我想转换成Python代码

 if iframe == 1 
        faceDetector = vision.CascadeObjectDetector;
        faceRect = faceDetector(cur_Frame);
    end
    
    %crop the detected face
    crop_Image = imcrop(cur_Frame, [faceRect(1:2), faceRect(3:4)-1]);

在python中没有CascadeObjectDetector，所以如何转换这部分？谢谢