Automatic Channel Alignment

Demonstrated on the Photographs of

S.M. Prukudin-Gorskii

Abe Wong (arwong.spamalope@andrew.cmu.edu)

Images are aligned using normalized correlation of the derivative over a window. See relevant sources for more information.

Window of blue channel

Kernel from green channel, flipped.

Convolution...

Running on a WEH5336 Red Hat machine, the small sample images run almost instantaneously. The offset calculations for the large images run in ~12 seconds on the full image, and ~5 seconds using a 5-level pyramid. These times are approximate since MATLAB looks like it starts having virtual memory issues if the alignment is run repeatedly on the large images.

Sample Images

Large Train (471k JPEG)