1 长春理工大学光电工程学院, 吉林 长春 130022
2 江苏北方湖光光电有限公司, 江苏 无锡 214035
3 中国电子科技集团公司第五十五研究所, 江苏 南京 210016
针对锥面折反射的全景成像系统采集的圆柱内壁全景图像存在畸变的问题,提出锥面双向投影模型下的圆柱内壁全景图像展开方法。建立含有畸变参数的正向和逆向投影模型,先将圆柱内壁全景图像的像素点逆向映射到展开图像,再将展开图像中缺失的像素点正向映射到原全景图像,通过全景图像和展开图像对应像素点的坐标映射关系,实现圆柱内壁全景图像的展开。实验结果表明:该方法较好地校正了圆柱内壁全景图像的切向和径向畸变,锥面双向投影模型定位精度为亚像素级,相比同心圆环近似展开法,信息熵和平均梯度均有不同程度的提高,能够有效应用于圆柱物体内壁全景图像的展开。
成像系统 锥面折反射全景成像 正向投影 逆向投影 全景图展开
Author Affiliations
Abstract
Key Laboratory of Quantum Information and Quantum Optoelectronic Devices of Shaanxi Province, School of Science, Xi’an Jiaotong University, Xi’an 710049, China
We investigate the sensitivity of the angular rotation measurement with the method of homodyne detection in SU(2) and SU(1,1) interferometers by employing orbital angular momentum (OAM). By combining a coherent beam with a vacuum beam in an SU(2) interferometer, we get the sensitivity of the angular rotation measurement as 12Nl. We can surpass the limit of the angular rotation measurement in an SU(1,1) interferometer by combining a coherent beam with a vacuum beam or a squeezed vacuum beam when the probe beam has OAM. Without injection, the sensitivity can reach 12Nl. In addition, by employing another construction of an SU(1,1) interferometer where the pump beam has OAM, with the same injection of an SU(1,1) interferometer, the sensitivity of the angular rotation measurement can be improved by a factor of 2, reaching 14Nl. The results confirm the potential of this technology for precision measurements in angular rotation measurements.
(040.5570) Quantum detectors (350.5730) Resolution (120.3180) Interferometry. Photonics Research
2017, 5(6): 06000617
