toJson method
Implementation
Map toJson(){
Map _result = {};
if (face != null) _result.addAll({"face": face!.toJson()});
if (image != null) _result.addAll({"image": image!.toJson()});
if (faceIndex != null) _result.addAll({"faceIndex": faceIndex});
if (imageIndex != null) _result.addAll({"imageIndex": imageIndex});
return _result;
}