研究目的
Investigating the effect of temperature on digital cameras and proposing a modified camera design and a novel temperature compensation method to address the issue.
研究成果
The proposed modified camera design and temperature compensation method significantly reduce the calculated artifact transformation deviation, improving camera calibration and 3D measurements. The method is valid for every camera orientation, representing a significant improvement over contemporary camera calibration techniques.
研究不足
The response of a standard camera unit exposed to varying ambient temperature is unpredictable, and the observed hysteresis is irregular. The proposed camera design is a prototype and may not be suitable for real measurement devices without further development.
1：Experimental Design and Method Selection:
The study involved experiments with three different camera models to observe the effect of temperature variation on device performance. A modified camera design was proposed to exhibit predictable behavior under varying ambient temperature.
2：Sample Selection and Data Sources:
Three different camera models were used, including a CCD Pointgrey Grasshopper2 camera, a CMOS Basler asA2500, and a CCD IDS UI-6280SE-M-GL Rev 3 IDSCamera.
3：List of Experimental Equipment and Materials:
The test stand included a thermal chamber, a calibration artifact, temperature sensors, and a thermal imaging camera FLIR E
4：Experimental Procedures and Operational Workflow:
The experiments involved observing the camera warm-up process, testing in a thermal chamber, and validating the proposed compensation model.
5：Data Analysis Methods:
The coordinates of each dot marker center were extracted from each frame to monitor the image drift. A sub-pixel algorithm in MATLAB was used for this purpose.
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FLIR E40
E40
FLIR
Thermal imaging camera used to detect the camera temperature during the experiments.
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Basler asA2500
asA2500
Basler
Used as one of the camera models in the experiments to observe the effect of temperature variation on device performance.
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C125-1218-5M
C125-1218-5M
Basler
Lens used with the Basler asA2500 camera in the experiments.
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IDS UI-6280SE-M-GL Rev 3 IDSCamera
UI-6280SE-M-GL Rev 3
IDS
Used as one of the camera models in the experiments to observe the effect of temperature variation on device performance.
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Tamron M23FM12
M23FM12
Tamron
High-quality lens used with the IDS UI-6280SE-M-GL Rev 3 IDSCamera in the experiments.
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Pointgrey Grasshopper2
GS2-GE-50S5M-C
Pointgrey
Used as one of the camera models in the experiments to observe the effect of temperature variation on device performance.
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Fujinon HF25SA-1B
HF25SA-1B
Fujinon
Lens used with the Pointgrey Grasshopper2 camera in the experiments.
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Standa 8MT160-300
8MT160-300
Standa
Motorized delay line used in the test stand for positioning the calibration artifact.
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Standa 8MR151
8MR151
Standa
Motorized rotation stage used in the test stand for positioning the calibration artifact.
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