A remote key allocation method and system

Abstract

The invention discloses a remote key duplication method and system. The method comprises the following steps of: establishing a key blank database in which key blank models and model size parameters are stored; acquiring a key image; key image processing: processing the acquired key image, and eliminating the scale distortion caused by different shooting distances and shooting angles; extracting a key image tooth-shaped profile; three-dimensional key geometric model establishment: combining the extracted key profile with a key blank type to establish a three-dimensional key geometric model; and key printing: machining the three-dimensional key geometric model into an entity by utilizing a 3D printing technology. According to the method and system, the remote key duplication does not need tooth-shaped code recognition and camera calibration, and the precision meets the unlocking requirement.

Description

technical field [0001] The invention relates to the field of key distribution, in particular to a remote key distribution method and system. Background technique [0002] In 2008, B Laxton, K Wang, S Savage and other scholars from the University of California, San Diego collected images of keys 50 meters away through high-resolution cameras and telescopes, and performed contour extraction and tooth shape code recognition on them to obtain key teeth. font code (such as figure 1 shown), and finally combine the tooth shape code and the special equipment for key processing and forming to process the key blank to obtain the key (such as figure 2 shown), to achieve the purpose of remote key allocation. The keys processed by this method have high precision and strong reliability. However, due to the variety of key tooth shape codes in China today and the confusion of design standards, this method is difficult to promote in China. [0003] Using the binocular vision technology p...

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Problems solved by technology

However, for remote key distribution, this technology also has its own defects. Accurate 3D model reconstruction needs to calibrate the camera and take photos with a dedicated calibration board as the background, while the requirement for remote key distribution is that there is no need for any fixed Background, so the remote key distribution under the calibration conditions is meaningless, and the accuracy of the 3D model reconstructed by the non-calibration method, especially the 3D model accuracy of the key with complex tooth shape, is far lower than the use requirements, that is, based on the model. The key cannot be unlocked, so remote keying using non-calibration methods is still pointless

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