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A Stained Glass Image Filter David Mould University of Saskatchewan
Stained Glass Filter Goal: transform any image into stained- glass image ?
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
ErosionDilation Morphological Operators
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.
Bottlenecks split Large regions split
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
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)
Future Work painting glass glass defects – scarring, chipping – as additional channel to match initial image later technology: flashing, etching
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