[OctDev] image/padarray.m

[Josep i T. <jm...@pu...>]

Let's introduce padarray...

 -- Function File: B =  padarray (A,PADSIZE)
 -- Function File: B =  padarray (A,PADSIZE,PADVAL)
 -- Function File: B =  padarray (A,PADSIZE,PADVAL,DIRECTION)
     Pads an array in a configurable way.

     B = padarray(A,padsize) pads an array A with zeros, where PADSIZE
     defines the amount of padding to add in each dimension (it must be
     a vector of positive integers).

     Each component of PADSIZE defines the number of elements of
     padding that will be added in the corresponding dimension. For
     instance, [4,5] adds 4 elements of padding in first dimension
     (vertical) and 5 in second dimension (horizontal).

     B = padarray(A,padsize,padval) pads A using the value specified by
     PADVAL. PADVAL can be a scalar or a string. Possible values are:
    `0'
          Pads with 0 as described above. This is the default behaviour.

    `scalar'
          Pads using PADVAL as a padding value.

    `'circular''
          Pads with a circular repetition of elements in A (similar to
          tiling A).

    `'replicate''
          Pads 'replicating' values of A which are at the border of the
          array.

    `'symmetric''
          Pads with a mirror reflection of A.

     B = padarray(A,padsize,padval,direction) pads A defining the
     direction of the pad. Possible values are:
    `'both''
          For each dimension it pads before the first element the number
          of elements defined by PADSIZE and the same number again after
          the last element. This is the default value.

    `'pre''
          For each dimension it pads before the first element the
          number of elements defined by PADSIZE.

    `'post''
          For each dimension it pads after the last element the number
          of elements defined by PADSIZE.


-- 
Josep Monés i Teixidor
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