Cited by 20Multimodal Machine Learning ApplicationsGenerative Adversarial Networks and Image SynthesisImage Retrieval and Classification Techniques

Next-generation image captioning: A survey of methodologies and emerging challenges from transformers to Multimodal Large Language Models

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Abdulgalil, Huda Diab, Basir, Otman A.·2025·Natural Language Processing Journal

Abstract

The widespread availability of visual data on the Internet has fueled a significant interest in image-to-text captioning systems. Automated image captioning remains a challenging multimodal analytics task, integrating advances in both Computer Vision (CV) and Natural Language Processing (NLP) to understand image content and generate semantically meaningful textual descriptions. Modern deep learning-based approaches have supplanted traditional approaches in image captioning, leading to more efficient and sophisticated models. The development of attention mechanisms and transformer-based architectures has further enhanced the modeling of both language and visual data. Despite these gains, challenges such as long-tailed object recognition, bias in training data, and shortcomings in evaluation metrics constrain the capabilities of current models. Furthermore, an important breakthrough has been made with the recent emergence of Multimodal Large Language Models (MLLMs). By incorporating textual and visual data, MLLMs provide improved captioning flexibility, generative capabilities, and reasoning. However, these models introduce new challenges, including faithfulness, grounding, and computational cost. Although relatively few studies have comprehensively surveyed these developments, this paper provides a thorough analysis of Transformer-based captioning approaches, investigates the shift to MLLMs, and discusses associated challenges and opportunities. We also present a performance comparison of the latest models on the MS-COCO benchmark and conclude with perspectives on potential future research directions.

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Crossref · 10.1016/j.nlp.2025.100159

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  • Vision-language models often fall short when generating reliable alt text for technical figures, where precision, clarity, and conceptual correctness are essential.

    “While early work on vision-language models has shown promising results on everyday images, these approaches often fall short when generating reliable alt text for technical figures, where precision, clarity, and conceptual correctness are essential [1].”

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Authors
Abdulgalil, H. D., & Basir, O. A.
Affiliations
University of Waterloo (CA)
Corresponding author
Abdulgalil, Huda Diab
Venue
Natural Language Processing Journal
Publisher
Elsevier BV
Published
2025-09
Volume
12
Pages
100159
ISSN
2949-7191 (ISSN-L)
OpenAlex
W4411176006
Cited by
20
References
138
Citations by year
2026: 12 · 2025: 8
FWCI
7.07
Type
journal article
Language
en
Open access
Locations
  • Natural Language Processing Journal (publishedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Multimodal Machine Learning Applications
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Generative Adversarial Networks and Image Synthesis
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Image Retrieval and Classification Techniques
Keywords
image captioning, multimodal large language models, attention mechanism, training data bias, grounding, faithfulness, computational cost, vision-language models

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