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

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findNumExt(filename)

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getLTVOffsets(rootname, header=None)

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getChipId(header)

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getIDCFile(image, keyword='', directory=None) source code

__buildIDCTAB(header, directory, kw='cubic') source code

__getIDCTAB(header)

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

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rotateCubic(fxy, theta)

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

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getRange(members, ref_wcs, verbose=None)

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

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

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

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

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

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

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Variables

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no = False

yes = True

IDCTAB = 1

DRIZZLE = 2

TRAUGER = 3

DEFAULT_IDCDIR = '/thor/data2/iraf/epydoc_test'
def factorial(n): #Compute a factorial for integer n.

__package__ = 'pydrizzle'

Imports: os, ceil, floor, np, linalg, fileutil, buildRotMatrix, DEGTORAD

Function Details

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wcsfit(img_geom, ref)

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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).

Variables Details

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DEFAULT_IDCDIR


def factorial(n):
    #Compute a factorial for integer n.
    m = 1
    for i in range(int(n)):
        m = m * (i+1)
    return m

def combin(j,n):
    #Return the combinatorial factor for j in n.
    return (factorial(j) / (factorial(n) * factorial( (j-n) ) ) )

Value:

'/thor/data2/iraf/epydoc_test'