medianFilter {EBImage}R Documentation

2D constant time median filtering

Description

Filters a 16-bit image using Perreault's modern constant time median filtering algorithm [1].

Usage

medianFilter(x, size, cacheSize=512)

Arguments

x

An Image object or an array.

size

The sizelength of the square median filter in units of pixels.

cacheSize

The L2 cache size of the system CPU in kB.

Details

Median filtering is useful as a smoothing technique, e.g. in the removal of speckling noise.

If x contains multiple frames, the filter will be applied on each frame.

Value

An Image object or an array, containing the filtered version of x.

Author(s)

Joseph Barry, joseph.barry@embl.de, 2012

References

[1] S. Perreault and P. Hebert, "Median Filtering in Constant Time", IEEE Trans Image Process 16(9), 2389-2394, 2007

See Also

makeBrush, fft, gblur

Examples

  x = readImage(system.file("images", "nuclei.tif", package="EBImage"))
  if (interactive()) display(x, title='Nuclei')
  y = medianFilter(x, 5)  
  if (interactive()) display(y, title='Filtered nuclei')
[Package EBImage version 4.4.0 Index]