Coverage for python/lsst/meas/extensions/piff/piffPsf.py: 38%

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1# This file is part of meas_extensions_piff. 

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# You should have received a copy of the GNU General Public License 

20# along with this program. If not, see <https://www.gnu.org/licenses/>. 

21 

22__all__ = ["PiffPsf"] 

23 

24import pickle 

25import numpy as np 

26from lsst.afw.typehandling import StorableHelperFactory 

27from lsst.meas.algorithms import ImagePsf 

28from lsst.afw.image import Image 

29from lsst.geom import Box2I, Point2I, Extent2I, Point2D 

30 

31 

32class PiffPsf(ImagePsf): 

33 _factory = StorableHelperFactory( 

34 "lsst.meas.extensions.piff.piffPsf", 

35 "PiffPsf" 

36 ) 

37 

38 def __init__(self, width, height, piffResult): 

39 assert width == height 

40 ImagePsf.__init__(self) 

41 self.width = width 

42 self.height = height 

43 self.dimensions = Extent2I(width, height) 

44 self._piffResult = piffResult 

45 self._averagePosition = None 

46 

47 @property 

48 def piffResult(self): 

49 return self._piffResult 

50 

51 # Storable overrides 

52 

53 def isPersistable(self): 

54 return True 

55 

56 def _getPersistenceName(self): 

57 return "PiffPsf" 

58 

59 def _getPythonModule(self): 

60 return "lsst.meas.extensions.piff.piffPsf" 

61 

62 def _write(self): 

63 return pickle.dumps((self.width, self.height, self._piffResult)) 

64 

65 @staticmethod 

66 def _read(pkl): 

67 return PiffPsf(*pickle.loads(pkl)) 

68 

69 # ImagePsf overrides 

70 

71 def __deepcopy__(self, meta=None): 

72 return PiffPsf(self.width, self.height, self._piffResult) 

73 

74 def resized(self, width, height): 

75 assert width == height 

76 return PiffPsf(width, height, self._piffResult) 

77 

78 def _doComputeImage(self, position, color): 

79 return self._doImage(position, center=None) 

80 

81 def _doComputeKernelImage(self, position, color): 

82 return self._doImage(position, center=True) 

83 

84 def _doComputeBBox(self, position, color): 

85 return self._doBBox(Point2I(0, 0), center=True) 

86 

87 def getAveragePosition(self): 

88 if self._averagePosition is None: 

89 x = np.mean([star.image_pos.x for star in self._piffResult.stars]) 

90 y = np.mean([star.image_pos.y for star in self._piffResult.stars]) 

91 self._averagePosition = Point2D(x, y) 

92 return self._averagePosition 

93 

94 # Internal private methods 

95 

96 def _doImage(self, position, center): 

97 # Follow Piff conventions for center. 

98 # None => draw as if star at position 

99 # True => draw in center of image 

100 gsimg = self._piffResult.draw( 

101 position.x, position.y, stamp_size=self.width, center=center 

102 ) 

103 bbox = self._doBBox(position, center) 

104 img = Image(bbox, dtype=np.float64) 

105 img.array[:] = gsimg.array 

106 img.array /= np.sum(img.array) 

107 return img 

108 

109 def _doBBox(self, position, center): 

110 origin = -(self.dimensions//2) 

111 if center is None: 

112 origin = Point2I(position) + origin 

113 return Box2I(Point2I(origin), self.dimensions)