Investigation of an Autofocusing Method for Visible Aerial Cameras Based on Image Processing Techniques
In order to realize the autofocusing in aerial camera, an autofocusing system is established and its characteristics such as working principle and optical-mechanical structure and focus evaluation function are investigated. The reason for defocusing in aviation camera is analyzed and several autofoc...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2016-01-01
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| Series: | International Journal of Aerospace Engineering |
| Online Access: | http://dx.doi.org/10.1155/2016/1819472 |
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| _version_ | 1832548050593120256 |
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| author | Zhichao Chen Tao Zhang |
| author_facet | Zhichao Chen Tao Zhang |
| author_sort | Zhichao Chen |
| collection | DOAJ |
| description | In order to realize the autofocusing in aerial camera, an autofocusing system is established and its characteristics such as working principle and optical-mechanical structure and focus evaluation function are investigated. The reason for defocusing in aviation camera is analyzed and several autofocusing methods along with appropriate focus evaluation functions are introduced based on the image processing techniques. The proposed autofocusing system is designed and implemented using two CMOS detectors. The experiment results showed that the proposed method met the aviation camera focusing accuracy requirement, and a maximum focusing error of less than half of the focus depth is achieved. The system designed in this paper can find the optical imaging focal plane in real-time; as such, this novel design has great potential in practical engineering, especially aerospace applications. |
| format | Article |
| id | doaj-art-4a5435241f094646bfc4496ddff3b36e |
| institution | Kabale University |
| issn | 1687-5966 1687-5974 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Aerospace Engineering |
| spelling | doaj-art-4a5435241f094646bfc4496ddff3b36e2025-02-03T06:42:16ZengWileyInternational Journal of Aerospace Engineering1687-59661687-59742016-01-01201610.1155/2016/18194721819472Investigation of an Autofocusing Method for Visible Aerial Cameras Based on Image Processing TechniquesZhichao Chen0Tao Zhang1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaIn order to realize the autofocusing in aerial camera, an autofocusing system is established and its characteristics such as working principle and optical-mechanical structure and focus evaluation function are investigated. The reason for defocusing in aviation camera is analyzed and several autofocusing methods along with appropriate focus evaluation functions are introduced based on the image processing techniques. The proposed autofocusing system is designed and implemented using two CMOS detectors. The experiment results showed that the proposed method met the aviation camera focusing accuracy requirement, and a maximum focusing error of less than half of the focus depth is achieved. The system designed in this paper can find the optical imaging focal plane in real-time; as such, this novel design has great potential in practical engineering, especially aerospace applications.http://dx.doi.org/10.1155/2016/1819472 |
| spellingShingle | Zhichao Chen Tao Zhang Investigation of an Autofocusing Method for Visible Aerial Cameras Based on Image Processing Techniques International Journal of Aerospace Engineering |
| title | Investigation of an Autofocusing Method for Visible Aerial Cameras Based on Image Processing Techniques |
| title_full | Investigation of an Autofocusing Method for Visible Aerial Cameras Based on Image Processing Techniques |
| title_fullStr | Investigation of an Autofocusing Method for Visible Aerial Cameras Based on Image Processing Techniques |
| title_full_unstemmed | Investigation of an Autofocusing Method for Visible Aerial Cameras Based on Image Processing Techniques |
| title_short | Investigation of an Autofocusing Method for Visible Aerial Cameras Based on Image Processing Techniques |
| title_sort | investigation of an autofocusing method for visible aerial cameras based on image processing techniques |
| url | http://dx.doi.org/10.1155/2016/1819472 |
| work_keys_str_mv | AT zhichaochen investigationofanautofocusingmethodforvisibleaerialcamerasbasedonimageprocessingtechniques AT taozhang investigationofanautofocusingmethodforvisibleaerialcamerasbasedonimageprocessingtechniques |