Global Calibration of Multiple Cameras Based on Sphere Targets
Global calibration methods for multi-camera system are critical to the accuracy of vision measurement. Proposed in this paper is such a method based on several groups of sphere targets and a precision auxiliary camera. Each camera to be calibrated observes a group of spheres (at least three), while...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2016-01-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/16/1/77 |
| _version_ | 1798041504668712960 |
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| author | Junhua Sun Huabin He Debing Zeng |
| author_facet | Junhua Sun Huabin He Debing Zeng |
| author_sort | Junhua Sun |
| collection | DOAJ |
| description | Global calibration methods for multi-camera system are critical to the accuracy of vision measurement. Proposed in this paper is such a method based on several groups of sphere targets and a precision auxiliary camera. Each camera to be calibrated observes a group of spheres (at least three), while the auxiliary camera observes all the spheres. The global calibration can be achieved after each camera reconstructs the sphere centers in its field of view. In the process of reconstructing a sphere center, a parameter equation is used to describe the sphere projection model. Theoretical analysis and computer simulation are carried out to analyze the factors that affect the calibration accuracy. Simulation results show that the parameter equation can largely improve the reconstruction accuracy. In the experiments, a two-camera system calibrated by our method is used to measure a distance about 578 mm, and the root mean squared error is within 0.14 mm. Furthermore, the experiments indicate that the method has simple operation and good flexibility, especially for the onsite multiple cameras without common field of view. |
| first_indexed | 2024-04-11T22:22:26Z |
| format | Article |
| id | doaj.art-01fbc0fb844345098166dfe01f284944 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T22:22:26Z |
| publishDate | 2016-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-01fbc0fb844345098166dfe01f2849442022-12-22T03:59:59ZengMDPI AGSensors1424-82202016-01-011617710.3390/s16010077s16010077Global Calibration of Multiple Cameras Based on Sphere TargetsJunhua Sun0Huabin He1Debing Zeng2Ministry of Education Key Laboratory of Precision Opto-mechatronics Technology, Beihang University, Beijing 100191, ChinaMinistry of Education Key Laboratory of Precision Opto-mechatronics Technology, Beihang University, Beijing 100191, ChinaDepartment of Applied Science and Technology and Center for Microplasma Science and Technology, Saint Peter’s University, Jersey City, NJ 07036, USAGlobal calibration methods for multi-camera system are critical to the accuracy of vision measurement. Proposed in this paper is such a method based on several groups of sphere targets and a precision auxiliary camera. Each camera to be calibrated observes a group of spheres (at least three), while the auxiliary camera observes all the spheres. The global calibration can be achieved after each camera reconstructs the sphere centers in its field of view. In the process of reconstructing a sphere center, a parameter equation is used to describe the sphere projection model. Theoretical analysis and computer simulation are carried out to analyze the factors that affect the calibration accuracy. Simulation results show that the parameter equation can largely improve the reconstruction accuracy. In the experiments, a two-camera system calibrated by our method is used to measure a distance about 578 mm, and the root mean squared error is within 0.14 mm. Furthermore, the experiments indicate that the method has simple operation and good flexibility, especially for the onsite multiple cameras without common field of view.http://www.mdpi.com/1424-8220/16/1/77multiple vision sensorsglobal calibrationsphere targetssphere center reconstruction |
| spellingShingle | Junhua Sun Huabin He Debing Zeng Global Calibration of Multiple Cameras Based on Sphere Targets Sensors multiple vision sensors global calibration sphere targets sphere center reconstruction |
| title | Global Calibration of Multiple Cameras Based on Sphere Targets |
| title_full | Global Calibration of Multiple Cameras Based on Sphere Targets |
| title_fullStr | Global Calibration of Multiple Cameras Based on Sphere Targets |
| title_full_unstemmed | Global Calibration of Multiple Cameras Based on Sphere Targets |
| title_short | Global Calibration of Multiple Cameras Based on Sphere Targets |
| title_sort | global calibration of multiple cameras based on sphere targets |
| topic | multiple vision sensors global calibration sphere targets sphere center reconstruction |
| url | http://www.mdpi.com/1424-8220/16/1/77 |
| work_keys_str_mv | AT junhuasun globalcalibrationofmultiplecamerasbasedonspheretargets AT huabinhe globalcalibrationofmultiplecamerasbasedonspheretargets AT debingzeng globalcalibrationofmultiplecamerasbasedonspheretargets |