mirror of
https://github.com/wassname/scikit-image.git
synced 2026-06-29 04:27:42 +08:00
Johannes Schönberger
119 lines
3.3 KiB
Cython
119 lines
3.3 KiB
Cython
#cython: cdivision=True
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#cython: boundscheck=False
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#cython: nonecheck=False
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#cython: wraparound=False
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import numpy as np
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cimport numpy as np
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from libc.stdlib cimport malloc, free
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def dilate(np.ndarray[np.uint8_t, ndim=2] image,
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np.ndarray[np.uint8_t, ndim=2] selem,
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np.ndarray[np.uint8_t, ndim=2] out=None,
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char shift_x=0, char shift_y=0):
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cdef int rows = image.shape[0]
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cdef int cols = image.shape[1]
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cdef int srows = selem.shape[0]
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cdef int scols = selem.shape[1]
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cdef int centre_r = int(selem.shape[0] / 2) - shift_y
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cdef int centre_c = int(selem.shape[1] / 2) - shift_x
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image = np.ascontiguousarray(image)
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if out is None:
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out = np.zeros((rows, cols), dtype=np.uint8)
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else:
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out = np.ascontiguousarray(out)
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cdef np.uint8_t* out_data = <np.uint8_t*>out.data
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cdef np.uint8_t* image_data = <np.uint8_t*>image.data
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cdef int r, c, rr, cc, s, value, local_max
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cdef int selem_num = np.sum(selem != 0)
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cdef int* sr = <int*>malloc(selem_num * sizeof(int))
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cdef int* sc = <int*>malloc(selem_num * sizeof(int))
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s = 0
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for r in range(srows):
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for c in range(scols):
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if selem[r, c] != 0:
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sr[s] = r - centre_r
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sc[s] = c - centre_c
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s += 1
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for r in range(rows):
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for c in range(cols):
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local_max = 0
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for s in range(selem_num):
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rr = r + sr[s]
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cc = c + sc[s]
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if 0 <= rr < rows and 0 <= cc < cols:
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value = image_data[rr * cols + cc]
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if value > local_max:
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local_max = value
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out_data[r * cols + c] = local_max
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free(sr)
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free(sc)
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return out
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def erode(np.ndarray[np.uint8_t, ndim=2] image,
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np.ndarray[np.uint8_t, ndim=2] selem,
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np.ndarray[np.uint8_t, ndim=2] out=None,
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char shift_x=0, char shift_y=0):
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cdef int rows = image.shape[0]
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cdef int cols = image.shape[1]
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cdef int srows = selem.shape[0]
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cdef int scols = selem.shape[1]
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cdef int centre_r = int(selem.shape[0] / 2) - shift_y
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cdef int centre_c = int(selem.shape[1] / 2) - shift_x
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image = np.ascontiguousarray(image)
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if out is None:
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out = np.zeros((rows, cols), dtype=np.uint8)
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else:
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out = np.ascontiguousarray(out)
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cdef np.uint8_t* out_data = <np.uint8_t*>out.data
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cdef np.uint8_t* image_data = <np.uint8_t*>image.data
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cdef int r, c, rr, cc, s, value, local_min
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cdef int selem_num = np.sum(selem != 0)
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cdef int* sr = <int*>malloc(selem_num * sizeof(int))
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cdef int* sc = <int*>malloc(selem_num * sizeof(int))
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s = 0
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for r in range(srows):
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for c in range(scols):
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if selem[r, c] != 0:
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sr[s] = r - centre_r
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sc[s] = c - centre_c
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s += 1
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for r in range(rows):
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for c in range(cols):
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local_min = 255
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for s in range(selem_num):
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rr = r + sr[s]
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cc = c + sc[s]
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if 0 <= rr < rows and 0 <= cc < cols:
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value = image_data[rr * cols + cc]
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if value < local_min:
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local_min = value
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out_data[r * cols + c] = local_min
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free(sr)
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free(sc)
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return out
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