Research On Incoherent Light Correlation Imaging Scheme

Correlation imaging is a novel imaging technique based on the correlation of intensity fluctuations,which has high spatial resolution,strong anti-interference and flexible system control ability,etc.It can reconstruct the target object information without a spatial resolution detector,and therefore called “ghost” imaging again.During the last two decades,correlation imaging technology has attracted attention of the international community,has made great achievements in scientific research,and is developing towards the practical direction.This paper is based upon the incoherent light source correlation imaging system,optimizing the traditional correlation imaging system,such as the incoherent light speckle modulation,the influence of scattering medium on incoherent light source correlation imaging,the incoherent light source selection and long-distance safe transmission of the incoherent light correlation imaging bucket detection values,presenting the corresponding experimental scheme.The specific research connects are as follows:(1)Selecting digital light projector as incoherent light source,we propose a novel compression correlation imaging scheme based on hybrid speckle.By using low resolution speckle field measurement for a priori information in less number,recognition of the complex objects with different resolution scales using edge detection region recognition technology,detection of higher and lower resolution regions in objects.According to the recognition area,the hybrid speckle pattern composed of speckle with different size automatically generated and detected the target object.Improving the quality of reconstructed image with compressed sensing technology.Theoretical analysis and numerical simulation results show that this scheme significantly improves the contrast-to-noise ratio and visibility,and overcomes the influence of inappropriate speckle size on the quality of the reconstructed image.The scheme is simple and convenient to operate,and has important value in the practical application of correlation imaging.(2)We choose digital light projector as incoherent light source and propose correlation imaging scheme for color objects in scattering medium.The image reconstruction of the color object in scattering medium has realized.The relationship of the multi-wavelength color imaging and full spectrum white light imaging versus the different concentration of scattering medium has been discussed.The experimental results show that the scattering media with low light intensity allows greatly influence on the quality of the reconstructed image obtained from multi-wavelength color correlation imaging,and the influence of scattering media decreases with the light intensity increased.In the premise of detector sensitivity,increasing the light intensity can properly improve the quality of reconstructed image of the color object in scattering medium.(3)We propose a computational correlation imaging scheme based on structured light illumination using liquid crystal display as incoherent light.The scheme using liquid crystal display as a modulator of speckle field,which greatly simplifies the experimental light path.We derive computational correlation imaging theory formula based liquid crystal display source and carried correlation imaging results contrastive analysis with the incoherent source of digital light projector.Based on the above experimental scheme,a long-distance secure transmission scheme for computational correlation imaging bucket detection values by incoherent light is proposed.The scheme based on the BB84 protocol,utilizes quantum key to encrypt the bucket detection values obtained from the liquid crystal display computational correlation imaging system of Alice and transmits the encrypted information to Bob via a long-distance quantum channel in an optical fiber.Then the object image can be reconstructed through the correlation calculation of values decrypted by Bob and the speckle pattern transmitted via a classical channel.The error rate is reduced by quantum key error correction algorithm,and high quality transmission image has obtained.