Slant Correction of Vehicle Licenses under LabVIEW
Haifeng Li · Journal of Changchun Post and Telecommunication Institute · 2005
The existing slant correction algorithm based on Radon transform needs much storage space and complex computations,and it hardly meets the real-time requirement.The correction of the vehicle license image was studied by improved Radon transform under LabVIEW,and the real-time was enhanced markedly.The principle of the DLL(Dynamic Link Library) was used in the LabVIEW environment.The previous algorithm was improved by restricting the degree range from-5°~+5°.The proposed algorithm was easily implemented by the programming interfaces of LabVIEW.The system is very simple and clarified because the fussy lines of the graphical language LabVIEW was avoided by utilizing DLL.The slant correction of 534×178 vehicle license is fulfilled within 6.7 seconds and the absolute error is less than 0.2°.The results indicate that the proposed scheme can carry out the slant correction of the vehicle license more rapidly and accurately.