# Effective pixel size calibration

This folder contains the images used to calibrate the effective size of a pixel in the images of the Repeatability experiment. The images are of USAF resolution targets.

For this analysis we use a package we developed called `micat`. The version of `micat` used for this analysis is archived in the libraries folder.  
*NOTE* a command line arguments `-g` and `-e` are used to manually identify groups

At the time of the experiment the file:  
`usaf_repeat_image_512.0.jpg`  
was taken. When analysed my `micat` a 2 is identified as a set of horizontal bars.

The image  
`usaf_repeat_image_512.0_edit.jpg`  
is the same image as `usaf_repeat_image_512.0.jpg` but a line has been drawn through the 2 to stop it being picked up by `micat`.  
The PDF shows that the element and groups are correctly identified.
This gives a result of  5.55 um per pixel.
