depth-estimator

Depth Estimation Using ResNet50 and XGBoost

Author

• Vishal Adithya.A

Overview

This project demonstrates a depth estimation XgBoost Regressor model that predicts the average depth of images provided using features extracted from a pre-trained ResNet50 model.The model was trained upon the NYUv2 dataset (0jl/NYUv2). The trained model is saved using Python's pickle library for easy deployment and reuse.

Loading the Model

The model is saved as model.pkl using pickle. You can load and use it as follows:

with open("model.pkl", "rb") as f:
    model = pickle.load(f)

features = extract_features("path/to/image.jpg") 
predicted_depth = model.predict([features])
print(predicted_depth[0])

NOTE: extract_features() is a predefined function in the original code which uses ResNet50 to extract features out of the image.

Key Features

• Model Architecture:
  • Feature extraction: ResNet50 (pre-trained on ImageNet, with the top layers removed and global average pooling).
  • Regression: XGBoost, optimized for structured data prediction.
• Training GPU: NVIDIA RTX 4060 Ti, ensuring efficient computation.
• Target: Predict the average depth of images based on the depth maps from the dataset.

Dataset

• Dataset: NYUv2 (0jl/NYUv2)
• Format: The dataset includes RGB images and corresponding depth maps.
• Preprocessing:
  • Images were resized to 224x224 pixels to match the input requirements of ResNet50.
  • Depth maps were converted into single average depth values.

Model Training

1. Feature Extraction:
   • ResNet50 was used to extract a fixed-length feature vector from each image.
   • Preprocessing: Images were normalized using the preprocess_input function from TensorFlow's ResNet50 module.
2. Regression:
   • XGBoost regressor was trained on the extracted features to predict average depth values.
   • Hyperparameters were tuned using cross-validation techniques for optimal performance.

Results

• R² Score: 0.841
• Performance is reasonable for a first few implementation and can be further improved with additional tuning or by improving feature extraction methods.

How to Use

Requirements

1. Python 3.10+
2. Required libraries:
   • numpy
   • pickle
   • xgboost
   • datasets
   • tensorflow
   • scikitlearn

Install the dependencies using pip:

pip install numpy tensorflow xgboost datasets scikit-learn

Training Pipeline

If you want to retrain the model, follow these steps:

1. Download the NYUv2 dataset from Hugging Face:

   from datasets import load_dataset
   dataset = load_dataset("0jl/NYUv2")
   

2. Extract features using ResNet50:

   
   model = ResNet50(weights="imagenet", include_top=False, pooling="avg")
   
   from PIL import Image
   def extract_features(image_path):
       image_array = preprocess_input(image_array)
       features = model.predict(image_array)
       return features.flatten()
   

3. Train the XGBoost regressor on the extracted features and save the model:

   
   regressor = XGBRegressor()
   regressor.fit(X_train, y_train)
   
   with open("model.pkl", "wb") as f:
       pickle.dump(regressor, f)
   

NOTE: This pipeline has just the base fundamental code more additional parameter tunings and preprocessing steps were being conducted during the training of the original model.

License

This project is licensed under the Apache License 2.0.

Acknowledgments

• Hugging Face for hosting the NYUv2 dataset.
• NVIDIA RTX 4060 Ti for providing efficient GPU acceleration.
• TensorFlow and XGBoost for robust machine learning frameworks.