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中国科大实现红外图像到可见图像转换 工作于红外波段的图像探测器普遍存在着灵敏度差、效率较低、价格昂贵等缺点。通过频率上转换的方法将红外图像信息转换到可见光波段，然后采用性能优、价格低的可见光波段图像探测器，是解决红外图像探测的一种行之有效的方法。相衬增强成像技术是一种重要的图像处理技术，将螺旋相衬边缘增强技术与非线性和频过程相结合来实现红外图像信息的上转换边缘增强，对图像处理和探测具有重要的意义。 史保森、周志远团队长期从事结构光场的非线性频率转换相关研究，先后研究了涡旋光束的倍频、和频过程中的传输、演化和守恒特性，并且发展了单光子结构光场的频率上转换探测技术。他们通过在上转换成像过程引入涡旋泵浦光，利用准相位匹配PPKTP晶体作为螺旋滤波和频率上转换介质，成功实现了红外光照射下物体边缘增强的上转换探测。同时，通过调控非线性过程中的相位匹配，实现了最高2.1倍的视场增强。实验结果与求解非线性耦合波方程数值模拟的结果很好地吻合。 相关链接：https://journals.aps.org/prapplied/pdf/10.1103/PhysRevApplied.11.044013 分享到：
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最新评论
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13169872681 2019-04-15 16:28
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dushunli 2019-04-15 17:02图像转换！
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星空38 2019-04-15 20:43中国科大实现红外图像到可见图像转换
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flash闪 2019-04-15 20:48好好学习天天向上
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mang2004 2019-04-15 22:43Up-Conversion Imaging Processing With Field-of-View and Edge Enhancement
Shi-Kai Liu, Chen Yang, Shi-Long Liu, Zhi-Yuan Zhou, Yan Li, Yin-Hai Li, Zhao-Huai Xu, Guang-Can Guo, and Bao-Sen Shi
Phys. Rev. Applied 11, 044013 (2019) – Published 4 April 2019
Spiral phase contrast (SPC) imaging is an important technique in edge detection. For infrared wavelengths, though, typical charge-coupled-device detectors are inefficient, slow, and noisy; to exploit them, one should instead work in the visible part of the spectrum. Here up-conversion SPC imaging is realized, based on sum-frequency generation, which also has the advantage of enhancing the field of view. This versatile technique is quite promising for e.g. reagent-free biological imaging, pattern recognition, and up-conversion edge detection.
Spiral phase contrast (SPC) is an important and commonly used image processing technology in edge detection applications, and realization of a broader field-of-view (FOV) is a long-pursued aim in imaging systems to allow more regions of the illuminated objects to be observed. Using the image processing technologies described, we first acquire both an enhanced FOV and SPC images using second-order nonlinear frequency up-conversion from the near-infrared (NIR) spectrum to the visible spectrum in two different configurations. In addition, SPC operation and sum-frequency generation using two different wavelengths is performed simultaneously within a periodically poled potassium titanyl phosphate (PPKTP) crystal by applying a vortex filter to the pump beam. When compared with the NIR spectrum, the up-converted image in the visible spectrum benefits from the advantages of higher detection sensitivity and lower potential speckle. By optimizing the temperature of the PPKTP crystal, controllable spatial patterns of up-converted images with observation cone angle enhancement of the FOV by more than 2.1 times is realized in both configurations. Additionally, we perform numerical simulations of the above phenomenon and the results agree well with those of the experimental observations. Our results provide a very promising image processing method that may be widely used in biomedicine and up-conversion monitoring applications.
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未来天气 2021-03-24 11:56就想看看图像是怎么样子的。是不是还原成了可见光的图像。