Ptychography is a coherent diffraction imaging method that uses phase retrieval techniques to reconstruct complex-valued images. It achieves this by sequentially illuminating overlapping regions of a sample with a coherent beam and recording the diffraction pattern. Although this addresses traditional imaging system challenges, it is computationally intensive and highly sensitive to noise, especially with reduced illumination overlap. Data-driven regularisation techniques have been applied in phase retrieval to improve reconstruction quality. In particular, plug-and-play (PnP) offers flexibility by integrating data-driven denoisers as implicit priors. In this work, we propose a half-quadratic splitting framework for using PnP and other data-driven priors for ptychography. We evaluate our method both on natural images and real test objects to validate its effectiveness for ptychographic image reconstruction.

翻译：叠层衍射成像是一种相干衍射成像方法，它利用相位恢复技术重建复数值图像。该方法通过使用相干光束顺序照射样本的重叠区域并记录衍射图案来实现重建。尽管这解决了传统成像系统的挑战，但该方法计算密集且对噪声高度敏感，特别是在照明重叠减少的情况下。数据驱动的正则化技术已被应用于相位恢复以提高重建质量。特别是，即插即用方法通过将数据驱动的去噪器作为隐式先验进行集成，提供了灵活性。在这项工作中，我们提出了一个半二次分裂框架，用于在叠层衍射成像中应用即插即用和其他数据驱动的先验。我们在自然图像和真实测试对象上评估了我们的方法，以验证其在叠层衍射图像重建中的有效性。