提出兼顾图像空间结构的超像素层次化嵌入方法,提升高维图像探索一致性。
Manifold-Preserving Superpixel Hierarchies and Embeddings for the Exploration of High-Dimensional Images
- 基于图像空间布局构建高维属性的超像素层次结构
- 在两个应用场景中验证了探索一致性显著优于传统方法
- 适合需要跨图像与属性空间协同分析的科研人员
高维图像(每像素含高维属性向量)通常通过低维嵌入与常规图像表示的协同视图进行探索。当前这类图像可能包含数百万像素。对于大规模数据集,层次化嵌入技术比平面降维方法更合适。然而,现有层次化降维方法仅依赖属性信息构建层次结构,忽略像素的空间布局,导致图像空间中的兴趣区域与属性抽象不一致,阻碍有效探索。本文提出一种考虑高维属性流形的超像素层次结构,在构建过程中融合图像空间信息,实现图像与属性空间的一致性探索。通过两个用例对比经典层次嵌入方法,验证了该方法在嵌入探索中的有效性。
原文摘要 · Abstract (English)
High-dimensional images, or images with a high-dimensional attribute vector per pixel, are commonly explored with coordinated views of a low-dimensional embedding of the attribute space and a conventional image representation. Nowadays, such images can easily contain several million pixels. For such large datasets, hierarchical embedding techniques are better suited to represent the high-dimensional attribute space than flat dimensionality reduction methods. However, available hierarchical dimensionality reduction methods construct the hierarchy purely based on the attribute information and ignore the spatial layout of pixels in the images. This impedes the exploration of regions of interest in the image space, since there is no congruence between a region of interest in image space and the associated attribute abstractions in the hierarchy. In this paper, we present a superpixel hierarchy for high-dimensional images that takes the high-dimensional attribute manifold into account during construction. Through this, our method enables consistent exploration of high-dimensional images in both image and attribute space. We show the effectiveness of this new image-guided hierarchy in the context of embedding exploration by comparing it with classical hierarchical embedding-based image exploration in two use cases.
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