This contains 4 set of 108 images. Each set of 108 images contains the 12 letters C, D, E, F, H. K, N, P, R, U, V and Z with 100%, 89.13%, 50.12%, 28.18%, 15.85%, 8.91%, 5.01%, 2.82% and 1.58% of the pixels present. Images are in Snellen font of size 275x275 pixels.

The name of each image is SetA-Bintact-C.png where

• A is the set (1, 2, 4 and 5) of which the image is part;
• B is the fragmentation level (100 is unfragmented, i.e. complete);
• C is the letter in the image.

This resource is not suitable for displaying within a web-browser.
It can be downloaded or viewed using the link: frag_letter_images.zip

If you have wget available (typically on linux systems), then you can also obtain a copy using the command

 wget  -nd  biobank.ndph.ox.ac.uk/ukb/ukb/auxdata/frag_letter_images.zip