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misc.py
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misc.py
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# BSD 3-Clause License
#
# Copyright (c) 2023, Friedrich-Alexander-Universität Erlangen-Nürnberg.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# * Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
from functools import partial
from scipy import interpolate
import numpy as np
import fsmr
def cmp_size(erp_size, block_size=32):
"""
Calculate cubemap size with number of samples close to erp.
:param erp_size: size of image in equirectangular projection
:param block_size: block size each face shall be dividable by
:return: cubemap size
"""
v = np.floor(np.sqrt(erp_size[0] * erp_size[1] / 6))
block_residual = v % block_size
if block_residual < block_size/2:
cubeface_res = v + (block_size - block_residual)
else:
cubeface_res = v - block_residual
return int(cubeface_res * 2), int(cubeface_res * 3)
def get_resampler(method):
"""
Convenience function to get a preconfigured resampler for the desired method.
:param method: resampling method ('nearest', 'linear', 'cubic', 'fsmr')
:return: preconfigured resampler
"""
if method in ['nearest', 'linear', 'cubic']:
return partial(interpolate.griddata, method=method, fill_value=0)
elif method == 'fsmr':
return partial(fsmr.resample_fsmr, transform_length=32, odc=0.5, sigma=0.93, shift=16, max_iterations=1000)
else:
raise ValueError(f"Unknown resampling method '{method}'.")