How to do FirebaseVisionImage.fromBytes(bytes, metadata) from firebase_vision_image package of flutter

Question

Hi I am using firebase_vision_image package of flutter and right now I do confused, is there a way to change FirebaseVisionImage.fromFile(myImage file) to FirebaseVisionImage.fromBytes(bytes, metadata)? I have used FirebaseVisionImage.fromFile(myImage file) and myImage here is an image taking from camera but I always get slow respond when image processing.. so here I want to try to convert myImage to bytes,metadata and I would like to see the differences for both of them or maybe is there a better way to speed the image processing up when image come from camera taking