Commit 73e93042 authored by Oleg Dzhimiev's avatar Oleg Dzhimiev
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Update README.md

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Used for camera systems optical calibration.
Outputs is a PDF file. No borders. Ready for printing.

![](https://community.elphel.com/pictures/escher_vs_checker.png)

# Recommendations

* Overall pattern rotation angle 0 is bad for correct MTF computation - because sensor pixel grid