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---
title: Image Formation
categories: session
---
> Vision is the inverse problem of image formation
- perspective
# Briefing
## Image Representation
![Eye Model from *Introduction to Psychology* by University of Minnesota](Images/eye.jpg)
+ Eye model
+ Viewpoints
+ 2D matrix
+ light intensity values
+ `image'
+ Sampling of the image
+ finite resolution
## Thin Lens Model
### The Focus Point
![Burning Glass from *College Physics* by OpenStax College](Images/sun.jpg)
![Diagram of Lens Focus Point from *College Physics* by OpenStax College](Images/lens.jpg)
+ 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
[Introduction to Psychology](https://open.lib.umn.edu/intropsyc)
by University of Minnesota is licensed under a
[Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License](https://creativecommons.org/licenses/by-nc-sa/4.0/), except where otherwise noted.
*College Physics*. Authored by: OpenStax College.
Located at: http://cnx.org/contents/031da8d3-b525-429c-80cf-6c8ed997733a/College_Physics.
[*College Physics*](http://cnx.org/contents/031da8d3-b525-429c-80cf-6c8ed997733a/College_Physics).
Authored by: OpenStax College.
License:
[CC BY: Attribution](https://creativecommons.org/licenses/by/4.0/).
License Terms: Located at License