butter2d 0.1.5

Butterworth filter for image processing.
Documentation 
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mod butterworth;
pub use butterworth::butterworth;
pub use butterworth::butterworth_color;
// For testing purposes:
pub use butterworth::pad_image;
pub use butterworth::get_nd_butterworth_filter;
// Export FFT functions for tests and external use
pub use butterworth::fft2d;
pub use butterworth::ifft2d;