Convert any image to coloring template

[Trilarion]

I wonder how one could prepare/convert any image (colored, non-continuous lines) to something that could be a good coloring template.

A good coloring template is:

• Black and White only and the black lines separate a certain number (10-100) of not too small, compact regions

Possible ways to achieve that good be:

• Edge detection
• Mapping to color levels
• Local averaging (similar to stained glass)
• Artificial intelligence?