Google Compatibility Test Suite (CTS) User Manual - Manual (Page 16)

[SENT] Message from Android accessory #10
5.3.2. Camera field of view calibration
This field of view calibration procedure is designed to be a quick way to determine
the device field of view with moderate accuracy.
Setup
Print the calibration-pattern.pdf target file and mount it on a rigid backing (Print on
11” x 17” or A3):
http://source.android.com/compatibility/calibration-pattern.pdf
Orient the camera device and the printed target as shown in the diagram below:
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