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Improving displayed resolution in convolution reconstruction of digital holograms

Improving displayed resolution in convolution reconstruction of digital holograms
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摘要 In digital holographic microscopy, when the object is placed near the COD, the Fresnel approximation is no longer valid and the convolution approach has to be applied. With this approach,the sampling spacing of the reconstructed image plane is equal to the pixel size of the COD. If the lateral resolution of the reconstructed image is higher than that of the COD,Nyquist sampling criterion is violated and aliasing errors will be introduced. In this Letter,a new method is proposed to solve this problem by investigating convolution reconstruction of digital holograms. By appending enough zeros to the angular spectrum between the two FFT＇s in convolution reconstruction of digital holograms,the displayed resolution of the reconstructed image can be improved. Experimental results show a good agreement with theoretical analysis.
作者 FAN Qi ZHANG Yan-cao WANG Jun DI Jiang-lei
机构地区 Institute of Optical Information Science and Technology
出处 《Optoelectronics Letters》 EI 2006年第4期305-307,311,共4页 光电子快报（英文版）
基金 SupportedbytheScienceFoundationofAeronauticsofChina(No02I53075)andtheDoctorateFoundationofNorthwesternPoly-technicalUniversity(NoCX200421).
关键词 全息光学 数字技术 卷积重建 显示技术 全息光学 数字技术 卷积重建 显示技术
分类号 O438.1 [机械工程—光学工程]
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参考文献8

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共引文献27

Optoelectronics Letters
2006年 第4期

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