Fig. 4.

Biological volumetric data can be tiled to generate subjects for online citizen science. Tiling may be necessary to reduce the field of view to a reasonable size to be presented to contributors for classification within a project. Here, we show an example tiling schema. To avoid reduced annotation quality at tile edges, original images are padded, and tiles are produced with an overlap in $x$ and $y$ of 50% of the tile width. This ensures full coverage of the original image, whereby any edge or corner features in one tile will be represented in the centre of an adjacent tile. Tiles are produced in both $x$ (blue) and $y$ (yellow). Overlap can be in $x$,$y$ or both $x$ and $y$ (purple). This example tiling schema would result in each pixel appearing in more than one subject at different locations within the frame. Due to the increased coverage that results from tiling data, it may be possible to reduce the retirement limit