Vision is the inverse problem of image formation

• perspective

Briefing

Image Representation

• Eye model
• Viewpoints
  • 2D matrix
  • light intensity values
  • `image’
• Sampling of the image
  • finite resolution

Thin Lens Model

The Focus Point

• A convex lens collect, or focus, parallel rays into a single focus point.
• This works as a burning glass.
  • The sun is so far away that the sun rays are parallel for all practical purposes.
• Definitions
  • Optical Axis is the line perpendicular on the lens, through its centre.
  • The Focus is a point on the Optical Axis. Rays which enter the lense parallel to the optical axis are deflected so that they intersect at the Focus.
  • Focal Length is the distance between the lens and the Focus. (We ignore the thickness of the lens.)
  • The Focal Plane is a plane through the Focus, perpendicular on the Optical Axis.

The Image Plane

• The image plane
  • non-parallel rays
• The thin lens equation
• Points further away
• The aperture

The pinhole model

• Reference frame
• Co-ordinates

Geometry of Image Formation

Exercises

Debrief

Credits

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