| Safe Haskell | None |
|---|---|
| Language | Haskell2010 |
Data.Array.Repa.Algorithms.Convolve
Description
Generic stencil based convolutions.
If your stencil fits within a 7x7 tile and is known at compile-time then using the built-in stencil support provided by the main Repa package will be 5-10x faster.
If you have a larger stencil, the coefficients are not statically known, or need more complex boundary handling than provided by the built-in functions, then use this version instead.
Synopsis
- convolveP :: (Num a, Unbox a, Monad m) => (DIM2 -> a) -> Array U DIM2 a -> Array U DIM2 a -> m (Array U DIM2 a)
- type GetOut a = (DIM2 -> a) -> DIM2 -> DIM2 -> a
- outAs :: a -> GetOut a
- outClamp :: GetOut a
- convolveOutP :: (Num a, Unbox a, Monad m) => GetOut a -> Array U DIM2 a -> Array U DIM2 a -> m (Array U DIM2 a)
Arbitrary boundary handling
Arguments
| :: (Num a, Unbox a, Monad m) | |
| => (DIM2 -> a) | Function to get border elements when the stencil does not apply. |
| -> Array U DIM2 a | Stencil to use in the convolution. |
| -> Array U DIM2 a | Input image. |
| -> m (Array U DIM2 a) |
Image-kernel convolution, which takes a function specifying what value to return when the kernel doesn't apply.
Specialised boundary handling
Arguments
| = (DIM2 -> a) | The original get function. |
| -> DIM2 | The shape of the image. |
| -> DIM2 | Index of element we were trying to get. |
| -> a |
A function that gets out of range elements from an image.
If the requested element is out of range use the closest one from the real image.