Image Registration Methods for Astronomy

(intended for extended emission, not stellar images!)

Documentation: http://image-registration.rtfd.org

Usage

• pip install image_registration or
• git clone https://github.com/keflavich/image_registration

from image_registration import chi2_shift
from image_registration.fft_tools import shift
import image_registration

#Generate Sample Image
image = image_registration.tests.make_extended(100)
offset_image = image_registration.tests.make_offset_extended(image, 4.76666, -12.33333333333333333333333, noise=0.1)

#Get Fused Image
xoff, yoff, exoff, eyoff = chi2_shift(image, offset_image)
corrected_image2 = shift.shiftnd(offset_image, (-yoff, -xoff))

Requirements:

Install the following version of the packages to replicate this repository:

• FITS_tools==0.2
• matplotlib==3.4.2
• astropy==4.2.1

For the following packages latest version should work:

• scipy
• pytest

To replicate in conda you can use environment.yml given in repository

Acknowledgments:

• Borrows heavily from http://www.mathworks.com/matlabcentral/fileexchange/18401-efficient-subpixel-image-registration-by-cross-correlation/content/html/efficient_subpixel_registration.html

• Replicates much of the functionality of http://www.astro.ucla.edu/~mperrin/IDL/sources/subreg.pro

Also implements http://solarmuri.ssl.berkeley.edu/~welsch/public/software/cross_cor_taylor.pro