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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。 相似文献
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We propose a color ghost imaging approach where the object is illuminated by three-color non-orthogonal random patterns. The object’s reflection/transmission information is received by only one single-pixel detector, and both the sparsity constraint and non-local self-similarity of the object are utilized in the image reconstruction process. Numerical simulation results demonstrate that the imaging quality can be obviously enhanced by ghost imaging via sparsity constraint and nonlocal self-similarity(GISCNL), compared with the reconstruction methods where only the object’s sparsity is used. Factors affecting the quality of GISCNL, such as the measurement number and the detection signal-to-noise ratio, are also studied. 相似文献
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为实现电子产品无铅化要求,掺杂预先合成的BNT和其它添加剂,制备出居里温度高于130℃的钛酸钡基无铅PTC材料。对其微观组织及性能进行了测试和表征,并对添加剂、试验工艺等影响因素进行了分析。 相似文献
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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. 相似文献
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