mirror of
https://github.com/wassname/scikit-image.git
synced 2026-06-28 23:57:58 +08:00
Johannes Schönberger
23 lines
621 B
Cython
23 lines
621 B
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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from libc.math cimport M_PI
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def unwrap_1d(double[::1] image, double[::1] unwrapped_image):
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'''Phase unwrapping using the naive approach.'''
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cdef:
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Py_ssize_t i
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double difference
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long periods = 0
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unwrapped_image[0] = image[0]
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for i in range(1, image.shape[0]):
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difference = image[i] - image[i - 1]
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if difference > M_PI:
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periods -= 1
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elif difference < -M_PI:
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periods += 1
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unwrapped_image[i] = image[i] + 2 * M_PI * periods
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