vascx-simplify 0.1.6

A PyTorch library for vessel and fundus image analysis (simplified rewrite)

vascx_simplify

A PyTorch library for vessel and fundus image analysis, providing GPU-accelerated preprocessing and inference utilities for medical imaging tasks.

Note: This is a simplified rewrite of rtnls_vascx_models by Eyened.

AI Usage Disclaimer

This project was developed with significant assistance from AI tools (GitHub Copilot, ChatGPT, Claude) for code organization, refactoring, documentation, and packaging.

Features

• GPU-Accelerated Preprocessing: Fast fundus image contrast enhancement with mixed precision support
• Sliding Window Inference: Efficient inference for large images
• Ensemble Models: Segmentation, classification, regression, and heatmap-based models
• HuggingFace Integration: Easy model loading from HuggingFace Hub
• Minimal Dependencies: Uses fewer dependency libraries for easier installation and maintenance

Installation

pip install vascx_simplify

From source:

git clone https://github.com/kapong/vascx_simplify.git
cd vascx_simplify
pip install -e .

Requirements

• Python >= 3.12
• PyTorch >= 1.10.0
• kornia >= 0.6.0
• scikit-learn >= 1.0.0
• scipy >= 1.7.0
• numpy >= 1.21.0
• huggingface-hub >= 0.10.0

Usage Examples

Artery/Vein Segmentation

Segment arteries (red), veins (blue), and crossings (green) from fundus images:

from vascx_simplify import EnsembleSegmentation, VASCXTransform, from_huggingface
from PIL import Image
import torch

# Load model
model_path = from_huggingface('Eyened/vascx:artery_vein/av_july24.pt')
model = EnsembleSegmentation(model_path, VASCXTransform())

# Predict
rgb_image = Image.open('fundus.jpg')
prediction = model.predict(rgb_image)  # Returns [B, H, W] with class values

Optic Disc Segmentation

Detect and segment the optic disc:

from vascx_simplify import EnsembleSegmentation, VASCXTransform, from_huggingface
from PIL import Image

model_path = from_huggingface('Eyened/vascx:disc/disc_july24.pt')
model = EnsembleSegmentation(model_path, VASCXTransform(512))

rgb_image = Image.open('fundus.jpg')
prediction = model.predict(rgb_image)  # Returns [B, H, W] with class values

Fovea Detection

Locate the fovea center using heatmap regression:

from vascx_simplify import HeatmapRegressionEnsemble, VASCXTransform, from_huggingface
from PIL import Image

model_path = from_huggingface('Eyened/vascx:fovea/fovea_july24.pt')
model = HeatmapRegressionEnsemble(model_path, VASCXTransform())

rgb_image = Image.open('fundus.jpg')
prediction = model.predict(rgb_image)  # Returns [B, M, 2] with (x, y) coordinates

fovea_x = prediction[0, 0, 0].item()
fovea_y = prediction[0, 0, 1].item()

Image Quality Assessment

Classify fundus image quality (Reject/Usable/Good):

from vascx_simplify import ClassificationEnsemble, VASCXTransform, from_huggingface
from PIL import Image

model_path = from_huggingface('Eyened/vascx:quality/quality.pt')
model = ClassificationEnsemble(model_path, VASCXTransform(have_ce=False))

rgb_image = Image.open('fundus.jpg')
prediction = model.predict(rgb_image)  # Returns [B, 3] with quality scores (already softmaxed)

# Get probabilities (already normalized)
q1_reject, q2_usable, q3_good = prediction[0].tolist()

Batch Processing

Process multiple images efficiently with automatic batch splitting to prevent out-of-memory errors:

from vascx_simplify import EnsembleSegmentation, VASCXTransform, from_huggingface
from PIL import Image

# Load model once
model_path = from_huggingface('Eyened/vascx:artery_vein/av_july24.pt')
model = EnsembleSegmentation(model_path, VASCXTransform())

# Load multiple images
images = [Image.open(f'fundus_{i}.jpg') for i in range(10)]

# Batch prediction (much faster than sequential processing)
predictions = model.predict(images)  # Returns [10, H, W]
# Automatically splits into chunks of 4 (default for segmentation)

# Process each result
for i, pred in enumerate(predictions):
    # pred is [H, W] - no need for [0] indexing
    save_prediction(pred, f'result_{i}.png')

# For large datasets, automatic splitting prevents OOM
large_images = [Image.open(f'img_{i}.jpg') for i in range(100)]
predictions = model.predict(large_images)  # Auto-splits into chunks
# Returns [100, H, W] - seamlessly handles large batches

# Override batch size for your GPU memory
predictions = model.predict(images, batch_size=8)  # Process 8 at once

Key Features:

• 🚀 2-3x faster than processing images sequentially
• 🛡️ Automatic OOM prevention - large batches split automatically
• 🔄 100% backward compatible - existing single-image code works unchanged
• ⚙️ Configurable - override batch size per call or use smart defaults
• 📊 Flexible inputs - accepts PIL.Image, torch.Tensor, or lists of either

Memory Management: Each model type has sensible default batch sizes:

• Segmentation: 4 images (sliding window is memory-intensive)
• Classification: 16 images (lightweight forward pass)
• Regression: 16 images
• Heatmap: 2 images (heatmaps are very memory-intensive)

Usage Patterns:

# Pattern 1: Batch processing a directory
import glob
from pathlib import Path

image_paths = glob.glob('fundus_images/*.jpg')
images = [Image.open(p) for p in image_paths]
predictions = model.predict(images)  # Efficient batch processing

# Pattern 2: Process with torch tensors
tensors = [torch.randn(3, 512, 512) for _ in range(20)]
predictions = model.predict(tensors)  # Works with tensors too

# Pattern 3: Memory-constrained environment
predictions = model.predict(images, batch_size=2)  # Smaller batches

# Pattern 4: High-memory GPU
predictions = model.predict(images, batch_size=16)  # Larger batches

Backward Compatibility: All existing single-image code works without modification:

# This still works exactly as before
image = Image.open('fundus.jpg')
pred = model.predict(image)  # Returns [1, H, W]
result = pred[0]  # Access with [0] as before

Performance Tips:

• Use batch processing for 3+ images to see significant speedup
• Default batch sizes are optimized for most GPUs (8-16GB VRAM)
• Increase batch_size for high-memory GPUs (24GB+)
• Decrease batch_size if you encounter OOM errors
• List of tensors is slightly faster than list of PIL.Images

See examples/05_batch_processing.py for a complete performance demonstration.

License

MIT License - see LICENSE file for details.

Author

Phongphan Phienphanich [e-mail]

Acknowledgments

This is a simplified rewrite of rtnls_vascx_models by Eyened.