Rescaled fragment layers
------------------------

This directory contains rescaled layers for fragments 1-5 from https://dl.ash2txt.org/fragments/.

 - training_set_12345.zip - Full set of rescaled layers in one file, contains full contents of train_scrolls folder
 - train_scrolls - Rescaled layers for fragments 1-5 as png in the directory format as expected by e.g. the GP winning model

The original fragments (as used in Kaggle competetion) were exported segmented and exported from scan volumes scanned
with 3.24um resolution. All the existing models and label for Scroll 1 have been trained against data exported from
7.91um scan volumes. To more allow using the existing fragments and label data together with training data from Scroll 1,
fragment layers were here rescaled to 7.91um.

Code
----

Rescaling has been done in a branch of vesuvius-gui at https://github.com/jrudolph/vesuvius-gui/tree/render-rescaled-fragments.
It is currently not so easy to reproduce for various reasons but I will work on making the functionality available in a proper
release of vesuvius-gui in the future.

Process
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 - Rescale the PPM from 3.24um to 7.91um using bilinear interpolation from old to new uvs
 - Rerender layers 15 to 49 based on the rescaled PPM as 8-bit PNGs (using trilinear interpolation into the volume data)