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Add nearest mode for positions outside image

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This commit is contained in:
Johannes Schönberger
2012-08-30 12:08:21 +02:00
parent 4dfdc7f74f
commit 4cd1f8798b
4 changed files with 25 additions and 23 deletions
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skimage/_shared/interpolation.pyx
+20 -15
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@@ -19,8 +19,8 @@ cdef inline double nearest_neighbour_interpolation(double* image, int rows,
Shape of image.
r, c : int
Position at which to interpolate.
mode : {'C', 'W', 'R'}
Wrapping mode. Constant, Wrap or Reflect.
mode : {'C', 'W', 'R', 'N'}
Wrapping mode. Constant, Wrap, Reflect or Nearest.
cval : double
Constant value to use for constant mode.
@@ -48,8 +48,8 @@ cdef inline double bilinear_interpolation(double* image, int rows, int cols,
Shape of image.
r, c : int
Position at which to interpolate.
mode : {'C', 'W', 'R'}
Wrapping mode. Constant, Wrap or Reflect.
mode : {'C', 'W', 'R', 'N'}
Wrapping mode. Constant, Wrap, Reflect or Nearest.
cval : double
Constant value to use for constant mode.
@@ -111,8 +111,8 @@ cdef inline double bicubic_interpolation(double* image, int rows, int cols,
Shape of image.
r, c : int
Position at which to interpolate.
mode : {'C', 'W', 'R'}
Wrapping mode. Constant, Wrap or Reflect.
mode : {'C', 'W', 'R', 'N'}
Wrapping mode. Constant, Wrap, Reflect or Nearest.
cval : double
Constant value to use for constant mode.
@@ -160,8 +160,8 @@ cdef inline double get_pixel(double* image, int rows, int cols, int r, int c,
Shape of image.
r, c : int
Position at which to get the pixel.
mode : {'C', 'W', 'R'}
Wrapping mode. Constant, Wrap or Reflect.
mode : {'C', 'W', 'R', 'N'}
Wrapping mode. Constant, Wrap, Reflect or Nearest.
cval : double
Constant value to use for constant mode.
@@ -190,28 +190,33 @@ cdef inline int coord_map(int dim, int coord, char mode):
Maximum coordinate.
coord : int
Coord provided by user. May be < 0 or > dim.
mode : {'W', 'R'}
mode : {'W', 'R', 'N'}
Whether to wrap or reflect the coordinate if it
falls outside [0, dim).
"""
dim = dim - 1
if mode == 'R': # reflect
if (coord < 0):
if coord < 0:
# How many times times does the coordinate wrap?
if (<int>(-coord / dim) % 2 != 0):
if <int>(-coord / dim) % 2 != 0:
return dim - <int>(-coord % dim)
else:
return <int>(-coord % dim)
elif (coord > dim):
if (<int>(coord / dim) % 2 != 0):
elif coord > dim:
if <int>(coord / dim) % 2 != 0:
return <int>(dim - (coord % dim))
else:
return <int>(coord % dim)
elif mode == 'W': # wrap
if (coord < 0):
if coord < 0:
return <int>(dim - (-coord % dim))
elif (coord > dim):
elif coord > dim:
return <int>(coord % dim)
elif mode == 'N': # nearest
if coord < 0:
return 0
elif coord > dim:
return dim
return coord