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#######################################################
# Copyright (c) 2019, ArrayFire
# All rights reserved.
#
# This file is distributed under 3-clause BSD license.
# The complete license agreement can be obtained at:
# http://arrayfire.com/licenses/BSD-3-Clause
########################################################
"""
Features class used for Computer Vision algorithms.
"""
import numbers
from .array import Array
from .library import backend, safe_call, c_dim_t, c_pointer, c_void_ptr_t
class Features(object):
"""
A container class used for various feature detectors.
Parameters
----------
num: optional: int. default: 0.
Specifies the number of features.
"""
def __init__(self, num=0):
self.feat = c_void_ptr_t(0)
if num is not None:
assert isinstance(num, numbers.Number)
safe_call(backend.get().af_create_features(c_pointer(self.feat), c_dim_t(num)))
def __del__(self):
"""
Release features' memory
"""
if not self.feat:
return
backend.get().af_release_features(self.feat)
self.feat = None
def num_features(self):
"""
Returns the number of features detected.
"""
num = c_dim_t(0)
safe_call(backend.get().af_get_features_num(c_pointer(num), self.feat))
return num
def get_xpos(self):
"""
Returns the x-positions of the features detected.
"""
out = Array()
safe_call(backend.get().af_get_features_xpos(c_pointer(out.arr), self.feat))
return out
def get_ypos(self):
"""
Returns the y-positions of the features detected.
"""
out = Array()
safe_call(backend.get().af_get_features_ypos(c_pointer(out.arr), self.feat))
return out
def get_score(self):
"""
Returns the scores of the features detected.
"""
out = Array()
safe_call(backend.get().af_get_features_score(c_pointer(out.arr), self.feat))
return out
def get_orientation(self):
"""
Returns the orientations of the features detected.
"""
out = Array()
safe_call(backend.get().af_get_features_orientation(c_pointer(out.arr), self.feat))
return out
def get_size(self):
"""
Returns the sizes of the features detected.
"""
out = Array()
safe_call(backend.get().af_get_features_size(c_pointer(out.arr), self.feat))
return out