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Vision-Language Models (VLMs) can perform zero-shot classification but are susceptible to adversarial attacks. While robust fine-tuning improves their robustness, existing approaches align fixed text embeddings with an image embedding,…

Computer Vision and Pattern Recognition · Computer Science 2026-04-22 Junhao Dong , Yifei Zhang , Hao Zhu , Yew-Soon Ong , Piotr Koniusz

Contrastive pretraining of image-text foundation models, such as CLIP, demonstrated excellent zero-shot performance and improved robustness on a wide range of downstream tasks. However, these models utilize large transformer-based encoders…

Computer Vision and Pattern Recognition · Computer Science 2024-04-02 Pavan Kumar Anasosalu Vasu , Hadi Pouransari , Fartash Faghri , Raviteja Vemulapalli , Oncel Tuzel

CLIP showcases exceptional cross-modal matching capabilities due to its training on image-text contrastive learning tasks. However, without specific optimization for unimodal scenarios, its performance in single-modality feature extraction…

Computer Vision and Pattern Recognition · Computer Science 2024-04-30 Chao Yi , Lu Ren , De-Chuan Zhan , Han-Jia Ye

Contrastive Language-Image Pre-training (CLIP) has become a foundation model and has been applied to various vision and multimodal tasks. However, recent works indicate that CLIP falls short in distinguishing detailed differences in images…

Computer Vision and Pattern Recognition · Computer Science 2025-06-02 Yinqi Li , Jiahe Zhao , Hong Chang , Ruibing Hou , Shiguang Shan , Xilin Chen

Vision-language models like CLIP demonstrate impressive zero-shot generalization but remain highly vulnerable to adversarial attacks. In this work, we propose Confidence-Aware Weighting (CAW) to enhance zero-shot robustness in…

Computer Vision and Pattern Recognition · Computer Science 2025-10-06 Nikoo Naghavian , Mostafa Tavassolipour

This paper examines the robustness of a multi-modal computer vision model, CLIP (Contrastive Language-Image Pretraining), in the context of unsupervised learning. The main objective is twofold: first, to evaluate the robustness of CLIP, and…

Computer Vision and Pattern Recognition · Computer Science 2023-09-20 Clement Laroudie , Andrei Bursuc , Mai Lan Ha , Gianni Franchi

Contrastive Language-Image Pre-trained (CLIP) models have zero-shot ability of classifying an image belonging to "[CLASS]" by using similarity between the image and the prompt sentence "a [CONTEXT] of [CLASS]". Based on exhaustive text cues…

Computer Vision and Pattern Recognition · Computer Science 2022-11-30 Xiaofeng Mao , Yuefeng Chen , Xiaojun Jia , Rong Zhang , Hui Xue , Zhao Li

Multi-modal contrastive models such as CLIP achieve state-of-the-art performance in zero-shot classification by embedding input images and texts on a joint representational space. Recently, a modality gap has been reported in two-encoder…

Computer Vision and Pattern Recognition · Computer Science 2024-06-10 Abrar Fahim , Alex Murphy , Alona Fyshe

Textual noise, such as typos or abbreviations, is a well-known issue that penalizes vanilla Transformers for most downstream tasks. We show that this is also the case for sentence similarity, a fundamental task in multiple domains, e.g.…

Computation and Language · Computer Science 2023-07-07 Mario Almagro , Emilio Almazán , Diego Ortego , David Jiménez

The rapid growth of deep learning has brought about powerful models that can handle various tasks, like identifying images and understanding language. However, adversarial attacks, an unnoticed alteration, can deceive models, leading to…

Computer Vision and Pattern Recognition · Computer Science 2025-11-18 Sampriti Soor , Alik Pramanick , Jothiprakash K , Arijit Sur

Contrastive Language--Image Pre-training (CLIP) has manifested remarkable improvements in zero-shot classification and cross-modal vision-language tasks. Yet, from a geometrical point of view, the CLIP embedding space has been found to have…

Computer Vision and Pattern Recognition · Computer Science 2024-09-17 Sedigheh Eslami , Gerard de Melo

Vision-language models (VLMs) such as CLIP demonstrate strong generalization in zero-shot classification but remain highly vulnerable to adversarial perturbations. Existing methods primarily focus on adversarial fine-tuning or prompt…

Computer Vision and Pattern Recognition · Computer Science 2026-03-02 Xingyu Zhu , Beier Zhu , Shuo Wang , Kesen Zhao , Hanwang Zhang

Contrastive Language-Image Pre-training (CLIP) delivers strong cross modal generalization by aligning images and texts in a shared embedding space, yet it persistently fails at compositional reasoning over objects, attributes, and relations…

Machine Learning · Computer Science 2025-10-31 Ziliang Chen , Tianang Xiao , Jusheng Zhang , Yongsen Zheng , Xipeng Chen

Contrastive cross-modal models such as CLIP and CLAP aid various vision-language (VL) and audio-language (AL) tasks. However, there has been limited investigation of and improvement in their language encoder, which is the central component…

Computation and Language · Computer Science 2023-10-23 Mengjie Zhao , Junya Ono , Zhi Zhong , Chieh-Hsin Lai , Yuhta Takida , Naoki Murata , Wei-Hsiang Liao , Takashi Shibuya , Hiromi Wakaki , Yuki Mitsufuji

Large-scale pre-trained image-text models demonstrate remarkable versatility across diverse tasks, benefiting from their robust representational capabilities and effective multimodal alignment. We extend the application of these models,…

Computer Vision and Pattern Recognition · Computer Science 2023-11-08 Sooyoung Park , Arda Senocak , Joon Son Chung

CLIP is a seminal multimodal model that maps images and text into a shared representation space through contrastive learning on billions of image-caption pairs. Inspired by the rapid progress of large language models (LLMs), we investigate…

Computer Vision and Pattern Recognition · Computer Science 2026-02-26 Weiquan Huang , Aoqi Wu , Yifan Yang , Xufang Luo , Yuqing Yang , Usman Naseem , Chunyu Wang , Chunyu Wang , Qi Dai , Xiyang Dai , Dongdong Chen , Chong Luo , Lili Qiu , Liang Hu

Large vision-language contrastive models (VLCMs), such as CLIP, have become foundational, demonstrating remarkable success across a variety of downstream tasks. Despite their advantages, these models, akin to other foundational systems,…

Computer Vision and Pattern Recognition · Computer Science 2025-07-10 Haocheng Dai , Sarang Joshi

Contrastive Language-Image Pre-training (CLIP) models have demonstrated remarkable performance in zero-shot classification tasks, yet their efficacy in handling complex multi-object scenarios remains challenging. This study presents a…

Computer Vision and Pattern Recognition · Computer Science 2025-02-28 Reza Abbasi , Ali Nazari , Aminreza Sefid , Mohammadali Banayeeanzade , Mohammad Hossein Rohban , Mahdieh Soleymani Baghshah

Large Vision-Language Models (LVLMs), trained on multimodal big datasets, have significantly advanced AI by excelling in vision-language tasks. However, these models remain vulnerable to adversarial attacks, particularly jailbreak attacks,…

Computer Vision and Pattern Recognition · Computer Science 2024-09-12 Md Zarif Hossain , Ahmed Imteaj

What distinguishes robust models from non-robust ones? While for ImageNet distribution shifts it has been shown that such differences in robustness can be traced back predominantly to differences in training data, so far it is not known…

Machine Learning · Computer Science 2024-11-08 Jonathan Crabbé , Pau Rodríguez , Vaishaal Shankar , Luca Zappella , Arno Blaas