我做了一个人脸识别的小程序，上传图片，返回图片中人脸的位置和相应位置识别的信息。返回结果是这样的：

[{location={"height":600,"rotation":5,"width":516,"left":-6.61,"top":503.13}, user_id=aaaa}, {location{"height":303,"rotation":-2,"width":268,"left":805.64,"top":729.71}, user_id=bbbb}]

我想要在原图上抠出识别的人脸图片，要怎么实现啊？