论文标题
通过结构化张量模型的低排相检索
Low-Rank Phase Retrieval with Structured Tensor Models
论文作者
论文摘要
我们研究了低排相的检索问题,其中目的是恢复一系列信号(通常是图像),鉴于这些信号的线性测量幅度。现有的解决方案涉及恢复通过矢量化和堆叠每个图像构建的矩阵。这些算法模拟该矩阵为低级别,并利用低级属性,以降低准确恢复所需的样品复杂性。但是,当可用测量的数量更加有限时,这些低级别矩阵模型通常会失败。我们提出了一种称为Tucker结构化相位检索(TSPR)的算法,该算法将图像的序列建模为张量,而不是使用Tucker分解来对其进行分解的矩阵。这种分解减少了需要估计的参数数量,从而使采样不足的制度更准确地重建。有趣的是,我们观察到,当适当地选择塔克等级时,这种结构在过度确定的环境中也有改善的性能。我们在几个不同的测量模型下证明了我们在真实视频数据集上的方法的有效性。
We study the low-rank phase retrieval problem, where the objective is to recover a sequence of signals (typically images) given the magnitude of linear measurements of those signals. Existing solutions involve recovering a matrix constructed by vectorizing and stacking each image. These algorithms model this matrix to be low-rank and leverage the low-rank property to decrease the sample complexity required for accurate recovery. However, when the number of available measurements is more limited, these low-rank matrix models can often fail. We propose an algorithm called Tucker-Structured Phase Retrieval (TSPR) that models the sequence of images as a tensor rather than a matrix that we factorize using the Tucker decomposition. This factorization reduces the number of parameters that need to be estimated, allowing for a more accurate reconstruction in the under-sampled regime. Interestingly, we observe that this structure also has improved performance in the over-determined setting when the Tucker ranks are chosen appropriately. We demonstrate the effectiveness of our approach on real video datasets under several different measurement models.