CLDTracker: A Comprehensive Language Description for Visual Tracking

2025-05-29

AI Summary

Traditional visual object tracking (VOT) suffers from insufficient robustness against dynamic appearance changes, occlusions, and cluttered backgrounds. To address this, we propose the first dual-branch tracking framework that jointly leverages multi-source semantic language descriptions and visual features. Our method introduces a novel Comprehensive Language Description (CLD) mechanism, which employs CLIP and GPT-4V to generate multi-granular, context-aware dynamic textual representations. Furthermore, we design a vision-language temporal adaptive fusion architecture that integrates dual-branch feature alignment, cross-modal attention, and target evolution modeling to enable fine-grained semantic guidance for temporally consistent tracking. Evaluated on six standard VOT benchmarks, our approach achieves state-of-the-art performance, demonstrating significant improvements in tracking accuracy and generalization capability under complex scenarios.

Technology Category

• Computer Vision: Motion & Tracking
• Natural Language Processing: Language Grounding & Multi-modal NLP
• Intelligent Robots: Multimodal Perception & Sensor Fusion

Application Category

• Search and Retrieval-Augmented AI: Multilingual and cross-lingual Web search
• Semantics and Knowledge: Methods to enhance, augment, integrate or synergize semantic models such as knowledge graphs and LLMs
• Web Mining and Content Analysis: Topic discovery and tracking

Abstract

VOT remains a fundamental yet challenging task in computer vision due to dynamic appearance changes, occlusions, and background clutter. Traditional trackers, relying primarily on visual cues, often struggle in such complex scenarios. Recent advancements in VLMs have shown promise in semantic understanding for tasks like open-vocabulary detection and image captioning, suggesting their potential for VOT. However, the direct application of VLMs to VOT is hindered by critical limitations: the absence of a rich and comprehensive textual representation that semantically captures the target object's nuances, limiting the effective use of language information; inefficient fusion mechanisms that fail to optimally integrate visual and textual features, preventing a holistic understanding of the target; and a lack of temporal modeling of the target's evolving appearance in the language domain, leading to a disconnect between the initial description and the object's subsequent visual changes. To bridge these gaps and unlock the full potential of VLMs for VOT, we propose CLDTracker, a novel Comprehensive Language Description framework for robust visual Tracking. Our tracker introduces a dual-branch architecture consisting of a textual and a visual branch. In the textual branch, we construct a rich bag of textual descriptions derived by harnessing the powerful VLMs such as CLIP and GPT-4V, enriched with semantic and contextual cues to address the lack of rich textual representation. Experiments on six standard VOT benchmarks demonstrate that CLDTracker achieves SOTA performance, validating the effectiveness of leveraging robust and temporally-adaptive vision-language representations for tracking. Code and models are publicly available at: https://github.com/HamadYA/CLDTracker

Problem

• Lack of rich textual representation for target object nuances
• Inefficient fusion of visual and textual features
• No temporal modeling of target's evolving appearance

Innovation

• Dual-branch architecture for vision-language fusion
• Rich textual descriptions from CLIP and GPT-4V
• Temporal modeling of target's evolving appearance