基于散斑照明的成像分辨率研究

照明方式对光学成像系统的分辨率有重大影响。从光场的相干性理论出发,研究了影响多帧散斑照明下一阶自相关成像和强度涨落二阶自相关成像分辨率的主要因素。理论和数值模拟结果表明,辐照于物面上的散斑横向相干长度大小与一阶自相关成像和强度涨落二阶自相关成像的分辨率呈非单调关系。此外,与传统非相干成像相比,一阶自相关成像和强度涨落二阶自相关成像仅能轻微地提高成像分辨率,而强度涨落二阶自相关成像只是对一阶自相关成像的结果起锐化作用,并不能进一步提高成像分辨率。     

多路并行探测提高光子计数关联成像质量研究

构建了一种基于多路并行探测提高光子计数关联成像质量的方案,分析了其成像性能,并通过数值模拟验证了其有效性。探讨了探测路数、回波信号平均光子数和辐照散斑场的稀疏度对成像质量的影响。数值模拟结果表明,该方案下的关联成像质量与探测路数成正相关,随着回波信号平均光子数和辐照散斑场稀疏度的增加,成像质量先提升后降低。     

Super-resolution imaging via sparsity constraint and sparse speckle illumination

We present an imaging approach via sparsity constraint and sparse speckle illumination which can dramatically enhance the optical system's imaging resolution. When the object is illuminated by some sparse speckles and the sparse reconstruction algorithm is utilized to restore the blur image, numerical simulated results demonstrate that the image,whose resolution exceeds the Rayleigh limit, can be stably reconstructed even if the detection signal-to-noise ratio(SNR)is less than 10 d B. Factors affecting the quality of the reconstructed image, such as the coded pattern's sparsity and the detection SNR, are also studied.