I honestly think the scope of this group should meet that of AAAI
- AI Overview
- Applications
- Cognitive Science
- Ethics & Social Issues
- Games & Puzzles
- History
- Interfaces
- Machine Learning (although here is overlap with Cross-Validated)
- Natural Language
- Philosophy
- Representation & Reasoning
- Robots (although Robotics SE exists)
- Speech
- Systems & Languages
- Vision (althoughtalthough here are many image-processing tags in Stackoverflow)
- Web & AI
As far as Topics that may be covered by other forums like the ones listed. Questions in these topics should be states as AI-based application
Possibly something like this: How do I apply edge detection to an image to make it more clear to see what directions my robot can go, I'm trying to design path planning algorithm for autonomous mobile robot.