zcdliuwei / German_License_Plate_Recognition

Android camera app for automatic recognition of German license plates using TensorFlow / TensorFlow Lite 2.0

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Udacity Capstone Project

Machine Learning Nanodegree 2020

Topic : Android App for German License Plate Recognition

This project is to create a small Android app that allows to recognize the license plate of a car quickly and easily with the camera of a smartphone or tablet and translate the license into plain text. The app marks the recognized license plate within the camera image with a bounding box and displays the determined license in plain text as annotation above the bounding box, as can be seen in the following example:

Prerequisites

For training the models of this project it is strongly recommended to use a computer with GPU support!

Setup Instructions

First create and change to a project directory and clone the project using the following command:

https://github.com/aboerzel/German_License_Plate_Recognition.git

This will download the repo to the current project directory.

For this project we need 2 development environments, a Tensorflow 1.13 environment for license plate detection with the Tensorflow Object Detection API, and a Tensorflow 2.0 environment for license recognition.

Important: The Tensorflow Object Detection API is currently not compatible with Tensorflow 2.0!

Setup Tensorflow 1.13 and Object Detection API

Change to the tf_object_detection folder and create a Tensorflow 1.13 environment tf1.13 for the Tensorflow Object Detction API and activate it

cd ./tf_object_detection
conda env create -f tf1.13.yml
activate tf1.13

Compile Protobufs

for /f %i in ('dir /b object_detection\protos\*.proto') do protoc object_detection\protos\%i --python_out=.

Install the object_detection python package

python Setup.py build
python Setup.py install

Install COCO API

pip install git+https://github.com/philferriere/cocoapi.git#egg=pycocotools^&subdirectory=PythonAPI

Setup Tensorflow 2.0

Deactivate the current environment, change back to the project root folder and create a Tensorflow 2.0 environment tf2.0

deactivate
cd ..
conda env create -f tf2.0.yml

Install Android Studio

Download and install Android Studio

Documentation

Here you can find the project proposal and the write-up of the final project:

To train the plate detection model activate the tf1.13 environment and run the following notebooks from the project root folder:

To train the license recognition model activate the tf2.0 environment and run the following notebooks from the project root folder:

The following notebook demonstrates the complete workflow by first extracting the license plate from the camera image using the Plate Detector and then determining the license text using the License Recognizer:

Android App

The Android App (APK file) can be downloaded from here.

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Android camera app for automatic recognition of German license plates using TensorFlow / TensorFlow Lite 2.0

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