Hologram stitching technology was used in phase-shifting interferometry to improve the quality of reconstructed image. By using the principle of correlation, the sub-interfero-grams captured by CCD were stitched into an integrated hologram. And the stitched hologram was reconstructed by standard four-step phase shifting interferometry algorithm to restore the object light. For the sake of comparison, the same reconstruction operation was conducted on the original sub-interferograms without stitching. Computer simulation experiments verified that the image quality could be improved obviously by this stitching technology. In addition, holograms were processed by zero padding and stitching, and the results showed that the zero padding could only improve the detail displaying ability, while the stitching technology improving both the resolution of reconstructed image and field of view.%将全息图拼接技术应用到相移数字全息术中,改善再现像的质量.用全息图强度相关原理进行全息图拼接,再通过标准四步算法对拼接后的全息图进行运算,恢复原始物光.作为对比,对没有拼接的全息图进行了同样的操作..计算机模拟实验证明该全息图拼接技术可明显提高再现像的质量.同时,通过对光学实验获得的全息图进行零填充和拼接对比研究证明,前者只能提高系统成像的细节显示能力,后者能够提高再现像的分辨率和视场大小.
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