1. Type
   1. offline
   2. online=real time
2. Algorithm
   1. Appearance-based
      1. Img Seq
         1. DJ
         2. Fire
      2. Deformable-2D templates
         1. ARToolkit
      3. Topic
   2. 3D Model-based
      1. Skeletal
      2. Volumetric
   3. signal-based
      1. infrared signal
3. Uses
   1. robotic
   2. game
   3. HCI
      1. control
      2. reconiztion
4. Input
   1. gloves
      1. exp1
      2. exp2
   2. camera
      1. normal single camera
      2. depth-aware camera
         1. MS:Kinect
      3. stereo camera
   3. controller
      1. Sony:PS-Eye+ PS-Move
      2. Nintendo: wii IR camera + wii-remote