mirror of
https://github.com/wassname/scikit-image.git
synced 2026-06-28 02:47:01 +08:00
Johannes Schönberger
58 lines
1.9 KiB
Cython
58 lines
1.9 KiB
Cython
from interpolation cimport coord_map, get_pixel2d
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import numpy as np
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cimport numpy as cnp
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from .utils import _mode_deprecations
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def coord_map_py(Py_ssize_t dim, long coord, mode):
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"""Python wrapper for `interpolation.coord_map`."""
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cdef char mode_c = ord(mode[0].upper())
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return coord_map(dim, coord, mode_c)
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def extend_image(image, pad=10, mode='constant', cval=0):
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"""Pad a 2D image by `pad` pixels on each side.
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Parameters
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----------
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image : ndarray
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Input image.
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pad : int, optional
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The number of pixels to pad around the border
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mode : {'constant', 'edge', 'symmetric', 'reflect', 'wrap'}, optional
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Points outside the boundaries of the input are filled according
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to the given mode.
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cval : float, optional
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Used in conjunction with mode 'constant', the value outside
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the image boundaries.
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Returns
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-------
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extended : ndarray
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The extended version of the input image.
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Notes
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-----
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For image padding, `skimage.util.pad` should be used instead. This
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function is intended only for testing `get_pixel2d` and demonstrating the
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coordinate mapping modes implemented in `coord_map`.
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"""
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mode = _mode_deprecations(mode)
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cdef:
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Py_ssize_t rows = image.shape[0]
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Py_ssize_t cols = image.shape[1]
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long ro, co
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char mode_c = ord(mode[0].upper())
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image = np.ascontiguousarray(image.astype(np.float64))
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output_shape = np.asarray(image.shape) + 2 * pad
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extended = np.zeros(output_shape, dtype=image.dtype)
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for r in range(-pad, rows + pad):
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for c in range(-pad, cols + pad):
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ro = r + pad
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co = c + pad
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extended[ro, co] = get_pixel2d(<double*> cnp.PyArray_DATA(image),
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rows, cols, <long> r, <long> c,
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mode_c, <double> cval)
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return extended
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