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docs/Alignment.md

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+# Alignment References
+
+The alignment references are used in every round to re-align the taken image to the reference coordinates. 
+Two alignment structures must be defined and the taken image then in each round is shifted and rotated according to their position
+with the target to be in exactly the same position as the reference image.
+
+!!! Note
+    The alignment structures needs to be unique and have a good contrast. 
+    It is advised to have them as far apart as possible.
+
+
+
+## Precondition
+Please make sure to have setup your camera properly and taken a good [Reference Image](../Reference-Image).
+
+## Define two Reference Images
+
+![](img/initial_setup_2_alignment_marks.jpg){: style="width:500px"}
+
+You can switch between this two marks with `(1)`.
+
+Then define the reference area in the image by either directly drag and drop with the mouse or use the input boxes below.
+To apply the currently marked image part you need to push `"Update Reference" (2)`. 
+
+In some cases it might be useful to use a reference with a higher contrast. This can be achieved by pushing `Enhance Contrast" (3)`.
+The result will be calculated on the ESP32 - so be a bit patient, before you see it active.
+
+To save push `"Save to config.ini" (4)`.
+
+!!! Note
+    A reboot is not required at this point of time.
+
+As next you should define the [Digit and Analog ROIs](ROI-Configuration.md).