15-463 Project 1: Colorizing the Prokudin-Gorskii photo collection

Procedure:

• After separating the RGB channels, I cropped 1/20 of the images from all 4 sides because of the error that the all-white and all-black borders cause in the alignment process.
• The alignment function is recursive: If the image is larger than 100x100 pixels, the function resizes the images by 1/3, then uses the result from this smaller picture to use a more specific displacement window when aligning. The alignment is done using normalized cross-correlation.
• Using the offsets from the alignment process, the images are cropped such that only the areas contained in all 3 channels show up in the final image. This eliminates the "ghost" effect at the edges.
• The channels are combined to get an RGB picture.

Results: