November 25, CCTV news channel reported the successful landing of China's J15 carrier-based aircraft in Liaoning ship. J15's successful takeoff and landing marks China's aircraft carrier platform experiment into a new stage, also marks the platform has begun to take combat effectiveness with a very real sense, the maintenance of national sovereignty and territorial integrity.

    
 
J15 successful takeoffs and landings to be officially confirmed, at home and abroad the media crazy republished reported. Observant people will find, the corner calibration marks on the J15 carrier aircraft. The corner calibration technique is a new not lead to bias visual marker technology, which not only high precision and very reliable.I the Secretary Hualang three-dimensional (Holon3D) also like this angle point calibration technique.

 Similar Othello disc grid intersection point of the corner points of the corner mark, and it satisfies the requirements of the ideal point - i.e. no size. Extracted directly to get the coordinates of the corner, rather than by fitting to get it, and therefore there will be no deviation between real corner. This not only improves the positioning accuracy, and also to ensure the accuracy and reliability of the follow-up photogrammetry.

Compared with dot markers, corner markers extraction is much more complex, if implemented in software alone, it is difficult to achieve real-time smooth scanning. To this end, we will do corner extraction algorithm into the hardware chip, not only ensure the fluency of the scan, but also greatly reduces the requirements on computer configuration.

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