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border_indices.pro

Routines

result = border_indices(array, width [, lower=lower] [, upper=upper] [, dimension=dimension]): This function calculates and returns the (1D) indices corresponding to the borders of an array.
test

Routine details

topborder_indices

result = border_indices(array, width [, lower=lower] [, upper=upper] [, dimension=dimension])

This function calculates and returns the (1D) indices corresponding to the borders of an array. These indices can be conerted back into n_dimensional indices via array_indices.

Return value

The indices corresponding to the border

Parameters

array in required

An array of any size

width in required

A scalar or vector specifying the border width. If width is a scalar, than an n-pixel border will be extraced along every dimension. Otherwise, width must have the same number of elements as array has dimensions. Each element specifies the border width along the corresponding dimension.

Keywords

lower in optional

Set to 1 to extract only the lower (low-index valued) edge of the data

upper in optional

Set to 1 to extract only the upper (high-index valued) edge of the data

dimension in optional

Set to an integer (1-8) do extract only the edge of the ith dimension of the data.

Examples

  to trim a 10 pixel border off of an image
  im = findgen(3,3)
  print, im
    0 1 2
    3 4 5
    6 7 8
  border = border_indices(im, 1)
  im[border] = 0
  print, im
   0 0 0
   0 4 0
   0 0 0

 SEE ALSO:
  reshape, indices

Author information

History:: April 2010: Written by Chris Beaumont July 2010: Added lower, upper, dimension keywords. cnb.

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test

File attributes

Modifcation date:	Mon Aug 2 20:22:07 2010
Lines:	150

Chris Beaumont's IDL Library

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