find_camera_mtx.md

 # Finding Camera Matrix
 ---
-We are looking for a Camera Matrix **K** described as follow:
+We are looking for a Camera Matrix **K** described as:
+
+![alt text](http://mathurl.com/gu7suza.png) , 
+
+where *f* is camera focal length, and *c* is optical center for axis *x* and *y*.
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