Package pydrizzle :: Module drutil

[frames] | no frames]

Module drutil

source code

Utility functions for PyDrizzle that rely on PyRAF's interface to IRAF tasks.

Functions

[hide private]

factorial(n)
Compute a factorial for integer n.

source code

combin(j, n)
Return the combinatorial factor for j in n.

source code

findNumExt(filename)

source code

getLTVOffsets(rootname, header=None)

source code

getChipId(header)

source code

getIDCFile(image, keyword=None, directory=None)

source code

__buildIDCTAB(header, directory, kw=None)

source code

__getIDCTAB(header)

source code

getIDCFileType(idcfile)
Open ASCII IDCFILE to determine the type: cubic,trauger,...

source code

readCubicTable(idcfile)

source code

_MgF2(lam)

source code

readTraugerTable(idcfile, wavelength)

source code

rotateCubic(fxy, theta)

source code

rotatePos(pos, theta, offset=None, scale=None)

source code

getRange(members, ref_wcs, verbose=None)

source code

computeRange(corners)
Determine the range spanned by an array of pixel positions.

source code

convertWCS(inwcs, drizwcs)
Copy WCSObject WCS into Drizzle compatible array.

source code

updateWCS(drizwcs, inwcs)
Copy output WCS array from Drizzle into WCSObject.

source code

wcsfit(img_geom, ref)
Perform a linear fit between 2 WCS for shift, rotation and scale.

source code

fitlin(imgarr, refarr)
Compute the least-squares fit between two arrays.

source code

getRotatedSize(corners, angle)
Determine the size of a rotated (meta)image.

source code

Variables

[hide private]

DEGTORAD = fileutil.DEGTORAD

no = False

yes = True

IDCTAB = 1

DRIZZLE = 2

TRAUGER = 3

DEFAULT_IDCDIR = os.getcwd()

Imports: string, os, types, ceil, floor, N, linalg, fileutil, buildRotMatrix

Function Details

[hide private]

wcsfit(img_geom, ref)

source code


Perform a linear fit between 2 WCS for shift, rotation and scale.
Based on 'WCSLIN' from 'drutil.f'(Drizzle V2.9) and modified to
allow for differences in reference positions assumed by PyDrizzle's
distortion model and the coeffs used by 'drizzle'.

Parameters:
    img      - ObsGeometry instance for input image
    ref_wcs  - Undistorted WCSObject instance for output frame

fitlin(imgarr, refarr)

source code

Compute the least-squares fit between two arrays. A Python translation of 'FITLIN' from 'drutil.f' (Drizzle V2.9).