OptiCorNet: Optimizing Sequence-Based Context Correlation for Visual Place Recognition

• URL: http://arxiv.org/abs/2507.14477v1
• Date: Sat, 19 Jul 2025 04:29:43 GMT
• Title: OptiCorNet: Optimizing Sequence-Based Context Correlation for Visual Place Recognition
• Abstract summary: This paper presents OptiCorNet, a novel sequence modeling framework.<n>It unifies spatial feature extraction and temporal differencing into a differentiable, end-to-end trainable module.<n>Our approach outperforms state-of-the-art baselines under challenging seasonal and viewpoint variations.
• Score: 2.3093110834423616
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Visual Place Recognition (VPR) in dynamic and perceptually aliased environments remains a fundamental challenge for long-term localization. Existing deep learning-based solutions predominantly focus on single-frame embeddings, neglecting the temporal coherence present in image sequences. This paper presents OptiCorNet, a novel sequence modeling framework that unifies spatial feature extraction and temporal differencing into a differentiable, end-to-end trainable module. Central to our approach is a lightweight 1D convolutional encoder combined with a learnable differential temporal operator, termed Differentiable Sequence Delta (DSD), which jointly captures short-term spatial context and long-range temporal transitions. The DSD module models directional differences across sequences via a fixed-weight differencing kernel, followed by an LSTM-based refinement and optional residual projection, yielding compact, discriminative descriptors robust to viewpoint and appearance shifts. To further enhance inter-class separability, we incorporate a quadruplet loss that optimizes both positive alignment and multi-negative divergence within each batch. Unlike prior VPR methods that treat temporal aggregation as post-processing, OptiCorNet learns sequence-level embeddings directly, enabling more effective end-to-end place recognition. Comprehensive evaluations on multiple public benchmarks demonstrate that our approach outperforms state-of-the-art baselines under challenging seasonal and viewpoint variations.

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