Evaluation method

1
Evaluation method
planar pers-pective image
accurate
planar pers-pective image
HyperOmni Vision
original omni-directional image
original omni-directional image
texture mapping (approximate)
Evaluation (PSNR)
accurate
planar pers-pective image
MPEG-4 Encorder
MPEG-4 Decorder
LadyBug

cartographical
cartographical
planar pers-pective image
(accurate)
polygonal
polygonal
2
Ideal (uniform and high resolution)
omni-directional video data are mapped onto a
surface of a regular polyhedron.
3
Equidistant Cylindrical Projection
latitude
longitude

• Bias of resolution
• Polar area is very enlarged.
• Difficulty of generating a common perspective
  image
• Nonlinear transformation
• Easy to understand to look at ?

4
Sanson-Flamsteed's projection / Sinusoidal
projection
Sin curve

• Bias of resolution ?
• Difficulty of generating a common perspective
  image
• Nonlinear transformation
• Easy to understand to look at ?
• Not square

5
Cubic Projection /Hexahedron Projection

• Bias of resolution ?
• Difficulty of generating a common perspective
  image ?
• Affine transformation (Linear transformation)
• Easy to understand to look at ?
• Not seamless

6
Icosahedron Projection

• Bias of resolution ?
• Difficulty of generating a common perspective
  image ?
• Affine transformation (Linear transformation)
• Many faces
• Easy to understand to look at ?
• Not seamless
• The faces is not square, but it can be rasterized.

7
Central Perspective Cylindrical Projection

• Bias of resolution
• Polar area is very enlarged.
• Difficulty of generating a common perspective
  image
• Nonlinear transformation
• Easy to understand to look at ?
• Not cover whole direction (polar area)

8
Cylinder Circles

• Bias of resolution ?
• Difficulty of generating a common perspective
  image
• Both of linear and nonlinear transformation
• Easy to understand to look at ?
• Not seamless (terrible)
• Difficult to rasterize (Not square)