LSST Applications
21.0.0-172-gfb10e10a+18fedfabac,22.0.0+297cba6710,22.0.0+80564b0ff1,22.0.0+8d77f4f51a,22.0.0+a28f4c53b1,22.0.0+dcf3732eb2,22.0.1-1-g7d6de66+2a20fdde0d,22.0.1-1-g8e32f31+297cba6710,22.0.1-1-geca5380+7fa3b7d9b6,22.0.1-12-g44dc1dc+2a20fdde0d,22.0.1-15-g6a90155+515f58c32b,22.0.1-16-g9282f48+790f5f2caa,22.0.1-2-g92698f7+dcf3732eb2,22.0.1-2-ga9b0f51+7fa3b7d9b6,22.0.1-2-gd1925c9+bf4f0e694f,22.0.1-24-g1ad7a390+a9625a72a8,22.0.1-25-g5bf6245+3ad8ecd50b,22.0.1-25-gb120d7b+8b5510f75f,22.0.1-27-g97737f7+2a20fdde0d,22.0.1-32-gf62ce7b1+aa4237961e,22.0.1-4-g0b3f228+2a20fdde0d,22.0.1-4-g243d05b+871c1b8305,22.0.1-4-g3a563be+32dcf1063f,22.0.1-4-g44f2e3d+9e4ab0f4fa,22.0.1-42-gca6935d93+ba5e5ca3eb,22.0.1-5-g15c806e+85460ae5f3,22.0.1-5-g58711c4+611d128589,22.0.1-5-g75bb458+99c117b92f,22.0.1-6-g1c63a23+7fa3b7d9b6,22.0.1-6-g50866e6+84ff5a128b,22.0.1-6-g8d3140d+720564cf76,22.0.1-6-gd805d02+cc5644f571,22.0.1-8-ge5750ce+85460ae5f3,master-g6e05de7fdc+babf819c66,master-g99da0e417a+8d77f4f51a,w.2021.48
LSST Data Management Base Package
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Public Member Functions | |
def | __init__ (self) |
def | makeBackgroundModel (self, in_x, pars=None) |
def | fitFootprintBackground (self, source, posImage, order=1) |
def | makeStarModel (self, bbox, psf, xcen, ycen, flux) |
def | makeModel (self, x, flux, xcenPos, ycenPos, xcenNeg, ycenNeg, fluxNeg=None, b=None, x1=None, y1=None, xy=None, x2=None, y2=None, bNeg=None, x1Neg=None, y1Neg=None, xyNeg=None, x2Neg=None, y2Neg=None, **kwargs) |
Public Attributes | |
debug | |
log | |
Lightweight class containing methods for generating a dipole model for fitting to sources in diffims, used by DipoleFitAlgorithm. See also: `DMTN-007: Dipole characterization for image differencing <https://dmtn-007.lsst.io>`_.
Definition at line 180 of file dipoleFitTask.py.
def lsst.ip.diffim.dipoleFitTask.DipoleModel.__init__ | ( | self | ) |
Definition at line 188 of file dipoleFitTask.py.
def lsst.ip.diffim.dipoleFitTask.DipoleModel.fitFootprintBackground | ( | self, | |
source, | |||
posImage, | |||
order = 1 |
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) |
Fit a linear (polynomial) model of given order (max 2) to the background of a footprint. Only fit the pixels OUTSIDE of the footprint, but within its bounding box. Parameters ---------- source : `lsst.afw.table.SourceRecord` SourceRecord, the footprint of which is to be fit posImage : `lsst.afw.image.Exposure` The exposure from which to extract the footprint subimage order : `int` Polynomial order of background gradient to fit. Returns ------- pars : `tuple` of `float` `tuple` of length (1 if order==0; 3 if order==1; 6 if order == 2), containing the resulting fit parameters
Definition at line 283 of file dipoleFitTask.py.
def lsst.ip.diffim.dipoleFitTask.DipoleModel.makeBackgroundModel | ( | self, | |
in_x, | |||
pars = None |
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) |
Generate gradient model (2-d array) with up to 2nd-order polynomial Parameters ---------- in_x : `numpy.array` (2, w, h)-dimensional `numpy.array`, containing the input x,y meshgrid providing the coordinates upon which to compute the gradient. This will typically be generated via `_generateXYGrid()`. `w` and `h` correspond to the width and height of the desired grid. pars : `list` of `float`, optional Up to 6 floats for up to 6 2nd-order 2-d polynomial gradient parameters, in the following order: (intercept, x, y, xy, x**2, y**2). If `pars` is emtpy or `None`, do nothing and return `None` (for speed). Returns ------- result : `None` or `numpy.array` return None, or 2-d numpy.array of width/height matching input bbox, containing computed gradient values.
Definition at line 193 of file dipoleFitTask.py.
def lsst.ip.diffim.dipoleFitTask.DipoleModel.makeModel | ( | self, | |
x, | |||
flux, | |||
xcenPos, | |||
ycenPos, | |||
xcenNeg, | |||
ycenNeg, | |||
fluxNeg = None , |
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b = None , |
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x1 = None , |
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y1 = None , |
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xy = None , |
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x2 = None , |
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y2 = None , |
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bNeg = None , |
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x1Neg = None , |
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y1Neg = None , |
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xyNeg = None , |
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x2Neg = None , |
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y2Neg = None , |
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** | kwargs | ||
) |
Generate dipole model with given parameters. This is the function whose sum-of-squared difference from data is minimized by `lmfit`. x : TODO: DM-17458 Input independent variable. Used here as the grid on which to compute the background gradient model. flux : `float` Desired flux of the positive lobe of the dipole xcenPos : `float` Desired x-centroid of the positive lobe of the dipole ycenPos : `float` Desired y-centroid of the positive lobe of the dipole xcenNeg : `float` Desired x-centroid of the negative lobe of the dipole ycenNeg : `float` Desired y-centroid of the negative lobe of the dipole fluxNeg : `float`, optional Desired flux of the negative lobe of the dipole, set to 'flux' if None b, x1, y1, xy, x2, y2 : `float` Gradient parameters for positive lobe. bNeg, x1Neg, y1Neg, xyNeg, x2Neg, y2Neg : `float`, optional Gradient parameters for negative lobe. They are set to the corresponding positive values if None. **kwargs Keyword arguments passed through ``lmfit`` and used by this function. These must include: - ``psf`` Psf model used to generate the 'star' - ``rel_weight`` Used to signify least-squares weighting of posImage/negImage relative to diffim. If ``rel_weight == 0`` then posImage/negImage are ignored. - ``bbox`` Bounding box containing region to be modelled Returns ------- zout : `numpy.array` Has width and height matching the input bbox, and contains the dipole model with given centroids and flux(es). If ``rel_weight`` = 0, this is a 2-d array with dimensions matching those of bbox; otherwise a stack of three such arrays, representing the dipole (diffim), positive and negative images respectively.
Definition at line 384 of file dipoleFitTask.py.
def lsst.ip.diffim.dipoleFitTask.DipoleModel.makeStarModel | ( | self, | |
bbox, | |||
psf, | |||
xcen, | |||
ycen, | |||
flux | |||
) |
Generate a 2D image model of a single PDF centered at the given coordinates. Parameters ---------- bbox : `lsst.geom.Box` Bounding box marking pixel coordinates for generated model psf : TODO: DM-17458 Psf model used to generate the 'star' xcen : `float` Desired x-centroid of the 'star' ycen : `float` Desired y-centroid of the 'star' flux : `float` Desired flux of the 'star' Returns ------- p_Im : `lsst.afw.image.Image` 2-d stellar image of width/height matching input ``bbox``, containing PSF with given centroid and flux
Definition at line 341 of file dipoleFitTask.py.
lsst.ip.diffim.dipoleFitTask.DipoleModel.debug |
Definition at line 190 of file dipoleFitTask.py.
lsst.ip.diffim.dipoleFitTask.DipoleModel.log |
Definition at line 191 of file dipoleFitTask.py.