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LSST Data Management Base Package
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_footprintContinued.py
Go to the documentation of this file.
1# This file is part of afw.
2#
3# Developed for the LSST Data Management System.
4# This product includes software developed by the LSST Project
5# (https://www.lsst.org).
6# See the COPYRIGHT file at the top-level directory of this distribution
7# for details of code ownership.
8#
9# This program is free software: you can redistribute it and/or modify
10# it under the terms of the GNU General Public License as published by
11# the Free Software Foundation, either version 3 of the License, or
12# (at your option) any later version.
13#
14# This program is distributed in the hope that it will be useful,
15# but WITHOUT ANY WARRANTY; without even the implied warranty of
16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17# GNU General Public License for more details.
18#
19
20__all__ = [] # import this module only for its side effects
21
22from typing import TYPE_CHECKING
23
24if TYPE_CHECKING:
25 from lsst.afw.image import Image
26
27import numpy as np
28
29from lsst.utils import continueClass
30
31from lsst.geom import Point2I
32from ._detection import Footprint
33
34
36 footprint1: Footprint,
37 footprint2: Footprint,
38 copyPeaks: bool = True,
39) -> Footprint:
40 """Calculate the intersection of two Footprints.
41
42 Parameters
43 ----------
44 footprint1: Footprint
45 The first Footprint.
46 footprint2: Footprint
47 The second Footprint.
48 copyFromFirst: bool
49 Whether or not to copy the peaks from the first Footprint.
50
51 Returns
52 -------
53 result:
54 The Footprint containing the intersection of the two footprints.
55 """
56 # Create the intersecting footprint
57 spans = footprint1.spans.intersect(footprint2.spans)
58 result = Footprint(spans)
59 result.setPeakSchema(footprint1.peaks.getSchema())
60
61 if copyPeaks:
62 # Only copy peaks that are contained in the intersection
63 for peak in footprint1.peaks:
64 if spans.contains(Point2I(peak.getIx(), peak.getIy())):
65 # Add a copy of the entire peak record to preserve the ID
66 result.peaks.append(peak)
67 return result
68
69
70@continueClass
71class Footprint: # noqa: F811
72 def computeFluxFromArray(self, image: np.ndarray, xy0: Point2I) -> float:
73 """Calculate the total flux in the region of an image array
74 contained in this Footprint.
75
76 Parameters
77 ----------
78 image:
79 Array containing the pixels to extract.
80 xy0:
81 The origin of the image array.
82
83 Returns
84 flux:
85 Flux from the image in pixels contained in the footprint.
86 """
87 return self.spans.flatten(image, xy0).sum()
88
89 def computeFluxFromImage(self, image: "Image") -> float:
90 """Calculate the total flux in the region of an Image contained in
91 this Footprint.
92
93 Parameters
94 ----------
95 image:
96 Image to extract.
97
98 Returns
99 -------
100 flux:
101 Flux from the image pixels contained in the footprint.
102 """
103 return self.computeFluxFromArray(image.array, image.getXY0())
104
105 def intersect(self, other: Footprint, copyPeaks: bool = True) -> Footprint:
106 """Calculate the intersection of this Footprint with another Footprint.
107
108 Parameters
109 ----------
110 other:
111 The other Footprint.
112 copyPeaks:
113 Whether or not to copy the peaks from this Footprint.
114 Note: the peaks in other are always ignored.
115
116 Returns
117 -------
118 result:
119 The Footprint containing the intersection of the two footprints.
120 """
121 return getFootprintIntersection(self, other, True)
float computeFluxFromArray(self, np.ndarray image, Point2I xy0)
Footprint intersect(self, Footprint other, bool copyPeaks=True)
Footprint getFootprintIntersection(Footprint footprint1, Footprint footprint2, bool copyPeaks=True)