> A few examples in the blog post stood out to me - both refine ambigous letters to clear ones, which demonstrates concerns other folks were talking about in this thread.
Those images show an effect that looks similar to LCD subpixel rendering, which is an artifact of a scanner working at the limit of what it's sensor is capable of producing (typical CCDs have subpixel stripes (or arrays), just like LCD screens.
Scanners typically overcome this by oversampling and then downsampling the raw data to smooth out the effect. In theory you could also do this with less oversampling if you could manage to get the scanner to do subpixel offsets, and oversampling isn't needed at all if the CCD doesn't use striping or a Bayer array but instead layers the RGB detectors on top of each other, like the Foveon X3 CCD.
Anyway, it is pretty clear that the main benefit of the upsampling interpolation in these particular images is in correcting these subpixel color fringes. Downsampling back to the original resolution should still yield an improved image, which is quite intriguing.
Those images show an effect that looks similar to LCD subpixel rendering, which is an artifact of a scanner working at the limit of what it's sensor is capable of producing (typical CCDs have subpixel stripes (or arrays), just like LCD screens.
Scanners typically overcome this by oversampling and then downsampling the raw data to smooth out the effect. In theory you could also do this with less oversampling if you could manage to get the scanner to do subpixel offsets, and oversampling isn't needed at all if the CCD doesn't use striping or a Bayer array but instead layers the RGB detectors on top of each other, like the Foveon X3 CCD.
Anyway, it is pretty clear that the main benefit of the upsampling interpolation in these particular images is in correcting these subpixel color fringes. Downsampling back to the original resolution should still yield an improved image, which is quite intriguing.