Colorizing the Prokudin-Gorskii Photo Collection

• 100px image window considered
• Used recursive multiscale image pyramid (scale factor 0.3)
• Base case: window size < 400px
• +/- 15px displacements used
• Minimized structural similarity index measure (SSIM) as image distance metric.
• considered weighted loss of RGB SSIM (weight 0.1) and gradient SSIM (weight 1.0)

The only image which did not nicely align is icon.jpg. I suspect this is because of the way in which I weighted dx, dy gradients over RGB differences. However, if I did not weight the scores the way I did, the other images would not have aligned.

• auto-contrast
• used gradients