Out-of-focus color camera calibration with one normal-sized color-coded pattern |
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| Institution: | 1. Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China;2. School of Automation, Wuhan University of Technology, Wuhan 430070, China;1. College of Engineering, Anhui Agricultural University, Hefei 230036, China;2. Anhui Province Engineering Laboratory of Intelligent Agricultural Machinery and Equipment, Hefei 230036, China;3. School of Automation, Wuhan University of Technology, Wuhan 430070, China;4. State Key Laboratory of Information Engineering in Surveying, Mapping, and Remote Sensing, Wuhan University, Wuhan 430079, China |
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| Abstract: | Conventional camera calibration methods always require well-focused target images for accurate feature detection. This requirement brings many challenges for long-range vision systems, due to the difficulty of fabricating an equivalent size target to the sensing field-of-view (FOV). This paper presents an out-of-focus color camera calibration method with one normal-sized color-coded pattern as the calibration target. The red, green and blue (RGB) channels of the color pattern are encoded with three phase-shift circular grating (PCG) arrays. The PCG centers used as feature points are extracted by ellipse fitting of the 2π-phase points. Experiments demonstrate that the proposed method can achieve accurate calibration results even under severe defocus. |
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