arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1607.04147cs.CV
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多模态字典学习图像分离及其在艺术调查中的应用

Multi-modal dictionary learning for image separation with application in art investigation

Vrije Universiteit Brussel(布鲁塞尔自由大学);iMinds;Duke University(杜克大学);University College London(伦敦大学学院)

Nikos Deligiannis, Joao F. C. Mota, Bruno Cornelis, Miguel R. D. Rodrigues, Ingrid Daubechies

摘要:

在艺术调查的支持下,我们提出了一种新的声源分离方法,该方法将从双面绘画中获得的单个X射线扫描解混。在这个问题中,待分离的X射线信号具有相似的形态特征,这使得以前的声源分离方法受到限制。我们的解决方案是使用从面板正面和背面拍摄的照片来驱动分离过程。我们的方法的关键依赖于耦合的两种成像方式(照片和X射线)使用一种新的耦合字典学习框架,能够捕获共同的和不同的功能,跨模态使用简约的表示;共同的组件模型功能共享的多模态图像,而创新组件捕获模态特定的信息。因此,我们的模型能够制定适当的正则化凸优化程序,导致X射线的准确分离。我们的字典学习框架可以定制为一个单一的和多尺度的框架,后者导致显着的性能改善。此外,为了进一步提高分离图像的视觉质量,我们建议训练耦合字典,忽略对应于裂纹的绘画的某些部分。合成和真实数据的实验-从数字采集的根特祭坛画(1432)-证实了我们的方法对国家的最先进的形态成分分析技术,使用固定或训练字典进行图像分离的优越性。

英文摘要:

In support of art investigation, we propose a new source separation method that unmixes a single X-ray scan acquired from double-sided paintings. In this problem, the X-ray signals to be separated have similar morphological characteristics, which brings previous source separation methods to their limits. Our solution is to use photographs taken from the front and back-side of the panel to drive the separation process. The crux of our approach relies on the coupling of the two imaging modalities (photographs and X-rays) using a novel coupled dictionary learning framework able to capture both common and disparate features across the modalities using parsimonious representations; the common component models features shared by the multi-modal images, whereas the innovation component captures modality-specific information. As such, our model enables the formulation of appropriately regularized convex optimization procedures that lead to the accurate separation of the X-rays. Our dictionary learning framework can be tailored both to a single- and a multi-scale framework, with the latter leading to a significant performance improvement. Moreover, to improve further on the visual quality of the separated images, we propose to train coupled dictionaries that ignore certain parts of the painting corresponding to craquelure. Experimentation on synthetic and real data - taken from digital acquisition of the Ghent Altarpiece (1432) - confirms the superiority of our method against the state-of-the-art morphological component analysis technique that uses either fixed or trained dictionaries to perform image separation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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