A Stained Glass Image Filter
David Mould
University of Saskatchewan
Stained Glass Filter
Goal: transform any
image into stainedglass image
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Stained Glass
“Cartoon” – planned
tile layout
Leading emphasizes
image edges
Tiles have simple
shapes
Few colors used
Voronoi regions
Mosaics; Photoshop filter
Stained Glass Tiles
Tile boundaries match
image edges
No large tiles
No small tiles
No “weird” tiles
Stained Glass Tiles (2)
Tiles should be
“approximately
convex” – no
bottlenecks
No “island” tiles
Segmentation
Morphological Operators
Erosion
Dilation
Region Smoothing
Region Smoothing
Tile Repair
Bottlenecks detected by progressive erosion.
Disconnected components are relabeled and
simultaneously dilated into the parent region.
Similar approach used to subdivide big tiles.
Completed Cartoon
Completed Cartoon
Large regions split
Bottlenecks split
Backgrounds
Backgrounds
Choosing Colors
Medieval palette highly restricted
Want colors near the image colors, but –
bright
high contrast
from limited palette
Heraldic Tinctures
Medieval colorset
Corresponds closely to colors available in
glass
Designed to be vivid and high-contrast
Heraldic Tinctures
Stained Glass Filter
Segmentation
Region smoothing
Removal of small tiles
Subdivision of strange-shaped tiles
Subdivision of large tiles
Tile coloring
Rendering
Color Selection
Choose heraldic color nearest the original
color
Map sable to off-white (clear glass)
Rendered Images
Future Work
painting glass
glass defects – scarring, chipping – as
additional channel to match initial image
later technology: flashing, etching
Questions?