Semantic similarity metrics for learned image registrationDownload PDF

04 Feb 2021, 11:40 (modified: 22 Jul 2022, 19:57)MIDL 2021Readers: Everyone
Keywords: Image Registration, Deep Learning, Feature Embedding
TL;DR: Novel semantic loss function for learned image registration. Dataset-specific semantic features are learned in both unsupervised and supervised settings. Somewhat invariant to noise and artifacts, beating baselines.
Abstract: We propose a semantic similarity metric for image registration. Existing metrics like euclidean distance or normalized cross-correlation focus on aligning intensity values, giving difficulties with low intensity contrast or noise. Our approach learns dataset-specific features that drive the optimization of a learning-based registration model. We train both an unsupervised approach using an auto-encoder, and a semi-supervised approach using supplemental segmentation data to extract semantic features for image registration. Comparing to existing methods across multiple image modalities and applications, we achieve consistently high registration accuracy. A learned invariance to noise gives smoother transformations on low-quality images.
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Paper Type: methodological development
Primary Subject Area: Image Registration
Secondary Subject Area: Unsupervised Learning and Representation Learning
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