imtile

Lightweight image tiling and reconstruction for computer vision & deep learning.

Split large images into fixed-size overlapping tiles for neural network inference, then reassemble them with weighted-average blending for seamless, lossless reconstruction.

Features

• ✅ Configurable overlap — eliminate boundary artifacts in segmentation / detection
• ✅ Lossless round-trip — tile → predict → reconstruct produces the exact original dimensions
• ✅ Boundary snapping — handles images whose dimensions aren't multiples of tile size
• ✅ GPU acceleration — auto-detects CuPy for transparent GPU processing
• ✅ Framework agnostic — works with plain NumPy arrays (no PyTorch/TF dependency)
• ✅ Grayscale & multi-channel — supports 2-D and 3-D arrays

Installation

pip install imtile

With GPU support (requires CUDA):

pip install imtile[gpu]

Quick Start

import numpy as np
from imtile import ImageTiler

# Load your large image (H, W, C)
image = np.random.randint(0, 256, (2048, 2048, 3), dtype=np.uint8)

# Create tiler with 256×256 tiles and 32px overlap
tiler = ImageTiler(tile_size=256, overlap=32)

# Split into tiles
tiles = tiler.tile(image)
print(f"Generated {len(tiles)} tiles")

# Process each tile (e.g., run through a neural network)
predictions = [my_model(tile) for tile in tiles]

# Reconstruct the full-size output
result = tiler.reconstruct(predictions, image.shape)
assert result.shape == image.shape

Convenience Functions

from imtile import tile_image, reconstruct_image

tiles = tile_image(image, tile_size=256, overlap=32)
result = reconstruct_image(tiles, image.shape, tile_size=256, overlap=32)

Algorithm

┌──────────────────────────────────────────┐
│            Original Image (H×W)          │
│                                          │
│  ┌─────────┐                             │
│  │ Tile 0   │                            │
│  │          │─overlap─┐                  │
│  └─────────┘         │                  │
│        ┌─────────────┤                  │
│        │  Tile 1      │                  │
│        │              │                  │
│        └──────────────┘                  │
│              ...                         │
│                        ┌────────────┐    │
│  Boundary tiles snap → │  Tile N     │   │
│  to image edge         │  (snapped)  │   │
│                        └────────────┘    │
└──────────────────────────────────────────┘

Reconstruction: canvas += tile; weights += 1
                result = canvas / weights  (weighted average)

Complexity: O(H × W) — linear in image area, optimal.

API Reference

ImageTiler(tile_size, overlap=0)

Method	Description
tile(image)	Split image into tiles. Returns List[ndarray].
reconstruct(tiles, original_shape)	Reassemble tiles with weighted averaging.

Module Functions

Function	Description
tile_image(image, tile_size, overlap)	Convenience wrapper for ImageTiler.tile.
reconstruct_image(tiles, shape, tile_size, overlap)	Convenience wrapper for ImageTiler.reconstruct.
gpu_available()	Returns True if CuPy/CUDA is detected.

Use Cases

• Semantic segmentation of satellite / aerial / medical imagery
• Object detection on high-resolution images (complementary to SAHI)
• Super-resolution inference on large inputs
• Any pipeline that needs to process images larger than GPU memory

License

MIT — free for personal, academic, and commercial use.

Contributing

Contributions are welcome! Please open an issue or pull request on GitHub. See CONTRIBUTING.md for guidelines.