Warper¶

class lsst.afw.math.Warper(warpingKernelName, interpLength=10, cacheSize=1000000, maskWarpingKernelName='', growFullMask=16)¶

Warp images.

Parameters

warpingKernelNamestr: see WarperConfig.warpingKernelName
interpLengthint, optional: interpLength argument to lsst.afw.math.warpExposure
cacheSizeint, optional: size of computeCache
maskWarpingKernelNamestr, optional: name of mask warping kernel (if "" then use warpingKernelName); see WarperConfig.maskWarpingKernelName
growFullMaskint, optional: mask bits to grow to full width of image/variance kernel

Methods Summary

`fromConfig`(config)	Create a Warper from a config.
`getMaskWarpingKernel`()	Get the mask warping kernel.
`getWarpingKernel`()	Get the warping kernel.
`warpExposure`(destWcs, srcExposure[, border, …])	Warp an exposure.
`warpImage`(destWcs, srcImage, srcWcs[, …])	Warp an image or masked image.

Methods Documentation

classmethod fromConfig(config)¶

Create a Warper from a config.

Parameters

warpExposure(destWcs, srcExposure, border=0, maxBBox=None, destBBox=None)¶

Warp an exposure.

Parameters

destWcslsst.afw.geom.SkyWcs: WCS of warped exposure
srcExposure: exposure to warp
borderint, optional: grow bbox of warped exposure by this amount in all directions (in pixels); if negative then the bbox is shrunk; border is applied before maxBBox; ignored if destBBox is not None
maxBBoxlsst.geom.Box2I, optional: maximum allowed parent bbox of warped exposure; if None then the warped exposure will be just big enough to contain all warped pixels; if provided then the warped exposure may be smaller, and so missing some warped pixels; ignored if destBBox is not None
destBBoxlsst.geom.Box2I, optional: exact parent bbox of warped exposure; if None then border and maxBBox are used to determine the bbox, otherwise border and maxBBox are ignored

Returns

Notes

calls lsst.afw.math.warpExposure insted of warpImage because the former copies attributes such as Calib, and that should be done in one place

The PSF is not warped. To warp the PSF, use lsst.meas.algorithms.WarpedPsf

warpImage(destWcs, srcImage, srcWcs, border=0, maxBBox=None, destBBox=None)¶

Warp an image or masked image.

Parameters

destWcslsst.afw.geom.SkyWcs: WCS of warped image
srcImage: image or masked image to warp
srcWcslsst.afw.geom.SkyWcs: WCS of image
borderint, optional: grow bbox of warped image by this amount in all directions (in pixels); if negative then the bbox is shrunk; border is applied before maxBBox; ignored if destBBox is not None
maxBBoxlsst.geom.Box2I, optional: maximum allowed parent bbox of warped image; if None then the warped image will be just big enough to contain all warped pixels; if provided then the warped image may be smaller, and so missing some warped pixels; ignored if destBBox is not None
destBBoxlsst.geom.Box2I, optional: exact parent bbox of warped image; if None then border and maxBBox are used to determine the bbox, otherwise border and maxBBox are ignored

Returns