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Image Formation

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---
title: Image Formation
categories: session
---

> Vision is the inverse problem of image formation


- perspective

# Briefing

## Image Representation 

## The Eye Model

![Eye Model from *Introduction to Psychology* by University of Minnesota](Images/eye.jpg)

+ Eye model 
+ An image of the real world is projected on the Retina.
+ Modern Cameras (more or less) replicate the Eye Model.

## Image Representation 

+ 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*](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