affine-transform

Easy to use multi-core affine transformations


Keywords
affine-transformation, c-plus-plus, openmp, pybind11, python
License
MIT
Install
pip install affine-transform==0.2.6

Documentation

Affine Transformation: C++17, OpenMP, Python

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This project explores how C++17 and OpenMP can be combined to write a surprisingly compact implementation of n-dimensional parallel affine transformations which are linked into Python via the affine_transform module.

While this project is still under development, the following features are supported:

  • Linear and cubic (without prefiltering) interpolation
  • Constant boundaries
  • Compiling code for arbitrarily dimensional data
  • Parallelism via OpenMP
  • Arbitrary shaped output arrays, allowing e.g. to only extract a transformed slice

Short example usage

import numpy as np

from affine_transform import transform
from mgen import rotation_from_angle

import matplotlib.pyplot as plt


# Create a simple white square in an image
original = np.zeros((601, 401))
original[100:300, 100:300] = 1

# Rotate by 22.5° (around the centre of the square (200,200))
# and shift +200 in x and +100 in y
transformed = transform(
    original, rotation_from_angle(np.pi / 8), np.array([200, 100]), origin=(200, 200)
)