R: 2D Convolution Filter

filter2 {EBImage}

R Documentation

2D Convolution Filter

Description

2D convolution-based linear filter for images and matrix data.

Usage


  ## S4 methods for signatures 'x=Image' or 'x=array' and
  ## 'filter=matrix' or 'filter=missing'
  filter2(x, filter, ...)
  
  ## S4 method for signature 'Image':
  sharpen2(x, ...)
  
  mkball(n=15, pow=1)
  mkbox(n=15)

Arguments

`x`	An object of `Image` in Grayscale mode, a numeric `array` or a `matrix`.
`filter`	A square matrix with odd dimensions.
`n`	The size of the filter matrix (odd number).
`pow`	The power of the function used to fill in the matrix.
`...`	Reserved.

Details

The convolution filter is based on fft transforms.

If x is an array, the filter is applied per frame (as to images).

sharpen2 uses filter2 to sharpen grayscale images by subtracting a slightly blurred image with the center pixel excluded.

Value

filter2 and return a transformed object of the same class as x.
mkball and mkbox return a square matrix that can be used for filter2.

Author(s)

filter2 author: Gregoire Pau, gpau@ebi.ac.uk, 2007

sharpen2 author: Oleg Sklyar, osklyar@ebi.ac.uk, 2007