Realize the reshape and imageprocess of a flutter project

I am building an image classification flutter android project. I used a TensorFlow Lite model to realise the image classification function. However, when I tested the application by taking some random pictures, the accuracy was extremely low. FYI, the Keras model accuracy reaches 93%, and I have not applied any data preprocessing during the model training. Therefore, I guess that the problem is that I can't handle the flutter plugin of tflite correctly. So, I need someone to help me rebuild the tflite flutter plugin part of the project.