Two-dimensional calibration board

Two-dimensional calibration board

  • CN 201,421,323 Y
  • Filed: 03/31/2009
  • Issued: 03/10/2010
  • Est. Priority Date: 03/31/2009
  • Status: Active Grant
First Claim
Patent Images

1. , a kind of two dimensional image scaling board comprises substrate, it is characterized in that, described substrate is provided with the patterned layer with rotational symmetry pattern.

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