SENSATION: Sidewalk Environment Detection System for Assistive NavigaTION

Project Overview

The Road Scene Understanding for the Visually Impaired initiative aims to develop a Sidewalk Environment Detection System for enhancing the mobility capabilities of visually impaired people through the combination of GPS systems and image segmentation techniques refined for sidewalk recognition.

Methods

• Using Valhalla routing API and GPS tracker signals to determine direction instructions.
• Training DeepLabv3 ResNet50 image segmentation model on Cityscapes dataset (5000 images, 50 cities) in Pytorch.
• Fine-tuning the model on Mapillary dataset (1000 images) to improve sidewalk detection.
• Combining GPS system and image segmentation model to assist navigation.

The project will be tested from the main train station in Erlangen to the University Library of Erlangen-Nuremberg (Schuhstrasse 1a).

Features

Core Components

• Sidewalk detection using DeepLabv3+ semantic segmentation
• Real-time navigation instructions using Valhalla routing
• Position estimation and speed calculation
• Intelligent sidewalk guidance system

System Architecture

Input Processing

• Video input support (testing mode)
• Camera input support (live mode)
• GPS coordinate processing
• Command-line interface for flexible input handling

Navigation Features

• Three-column sidewalk detection method
• Automated navigation commands
• Real-time speed estimation
• Combined routing and visual guidance

Technical Requirements

Environment Setup

To create a sample environment on Windows:

conda create -n myenv python=3.9
pip install torch==2.1.2 torchvision==0.16.2 torchaudio==2.1.2 --index-url https://download.pytorch.org/whl/cu121
pip install -r requirements.txt

Running Scripts

1. Running rsu_vi.py:

   • Ensure input_video.mp4 and GPS file are in the input folder.
   • Place model.onnx in the model_weights folder.

   For video input:

   python rsu_vi.py "input/input_video.mp4" "segmentation_output.avi" "model_weights/model.onnx" "input/new.gpx" --headless

   For image folder input:

   python rsu_vi.py "images" "segmentation_output" "model_weights/model.onnx" "input/new.gpx"

   For camera input:

   python rsu_vi.py 0 "cam_output.avi" "model_weights/model.onnx" "input/new.gpx"

2. Exporting ONNX Model (onnx_export.py):

   python onnx_export.py --pytorch="fine_tuned_mapillary.ckpt"

3. Training Cityscapes Model (city_training.py):

   • Set the dataset_path in city_config.py
   • Run the script:

   python city_training.py

4. Converting Mapillary Masks to Grayscale (convert_masks_to_grayscale.py):

   • Set json_path, masks_path, and op_path in map_config.py
   • Run the script:

   python convert_masks_to_grayscale.py

5. Fine-tuning on Mapillary Dataset (training_pipeline.py):

   • Set mapillary_train_path, mapillary_val_path, mapillary_test_path, city_ckpt_path in map_config.py
   • Run the script:

   python training_pipeline.py

6. Performing Inference on an Image (inference.py):

   • Set map_ckp_path, img_dir, and op_dir in map_config.py
   • Run the script:

   python inference.py

The following warning can be ignored:

[W NNPACK.cpp:64] Could not initialize NNPACK! Reason: Unsupported hardware.

License

This project is licensed under the MIT License. See the LICENSE file for more information.

Contact

For questions or support, please contact the project team at nurulgofran@gmail.com

Links to Resources

• input_video.mp4
• model.onnx
• trained on cityscapes model checkpoint
• fine-tuned on mapillary model checkpoint

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