A colored object encoding scheme in a ghost imaging （GI） system using orbital angular momentum is in- vestigated. A colored object is decomposed into three components and then each component is obtained in the idler...A colored object encoding scheme in a ghost imaging （GI） system using orbital angular momentum is in- vestigated. A colored object is decomposed into three components and then each component is obtained in the idler arm using a multiple grayscale encoding scheme. Afterward, we synthesize the three reconstructed components into a colored image. The scheme is conducted and then presented through numerical simula- tions and experiments. The simulation result shows that the average peak signal-to-noise ratio （PSNR） is at 21.636 for the reconstructed color of the ＂Lena＂ image with 255 gray scales. The experiment also shows that the PSNR is 8.082 for the reconstructed color of the ＂NUPT＂ characters. The successful imaging of colored obiects extends the further use of the GI technique展开更多
Optical encryption strategies utilizing fully coherent light have been widely explored but often face challenges such as speckle noise and beam instabilities.In this work,we introduce a novel protocol for multi-channe...Optical encryption strategies utilizing fully coherent light have been widely explored but often face challenges such as speckle noise and beam instabilities.In this work,we introduce a novel protocol for multi-channel optical information encoding and encryption using vectorial spatial coherence engineering of a partially coherent light beam.By characterizing the beam’s spatial coherence structure with a 2×2 coherence matrix,we demonstrate independent control over the three components of the coherence Stokes vector.This allows for three-channel optical information encoding and encryption,with applications in color image representation.Unlike existing methods based on fully coherent light modulations,our approach utilizes a two-point dependent coherence Stokes vector,proving resilient to random noise in experimental scenarios.Our findings provide a robust foundation for higher-dimensional optical encoding and encryption,addressing limitations associated with partially coherent light in complex environments.展开更多
基金supported by the National Natural Science Foundation of China(No.61271238)the Natural Science Research Foundation of Jiangsu Province(No.11KJA510002)+4 种基金the Open Research Fund Program of the National Laboratory of Solid State Microstructures(Nos.M25020 and M25022)the Foundation for Jiangsu Returned Chinese Scholar(No.NJ210002)the Open Research Fund of the Key Lab of Broadband Wireless Communication and Sensor Network Technology,the Ministry of Education(No.ZD035001NYKL01)the Priority Academic Program Development of Jiangsu Higher Education Institutionsthe Jiangsu Key Laboratory of Image Processing and Image Communication
文摘A colored object encoding scheme in a ghost imaging （GI） system using orbital angular momentum is in- vestigated. A colored object is decomposed into three components and then each component is obtained in the idler arm using a multiple grayscale encoding scheme. Afterward, we synthesize the three reconstructed components into a colored image. The scheme is conducted and then presented through numerical simula- tions and experiments. The simulation result shows that the average peak signal-to-noise ratio （PSNR） is at 21.636 for the reconstructed color of the ＂Lena＂ image with 255 gray scales. The experiment also shows that the PSNR is 8.082 for the reconstructed color of the ＂NUPT＂ characters. The successful imaging of colored obiects extends the further use of the GI technique
基金National Key Research and Development Program of China(2022YFA1404800,2019YFA0705000)National Natural Science Foundation of China(11974218,12192254,12274310,12274311,92250304,12347114)Jiangsu Funding Program for Excellent Postdoctoral Talent(2023ZB185).
文摘Optical encryption strategies utilizing fully coherent light have been widely explored but often face challenges such as speckle noise and beam instabilities.In this work,we introduce a novel protocol for multi-channel optical information encoding and encryption using vectorial spatial coherence engineering of a partially coherent light beam.By characterizing the beam’s spatial coherence structure with a 2×2 coherence matrix,we demonstrate independent control over the three components of the coherence Stokes vector.This allows for three-channel optical information encoding and encryption,with applications in color image representation.Unlike existing methods based on fully coherent light modulations,our approach utilizes a two-point dependent coherence Stokes vector,proving resilient to random noise in experimental scenarios.Our findings provide a robust foundation for higher-dimensional optical encoding and encryption,addressing limitations associated with partially coherent light in complex environments.
