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Article

Hybrid Convolutional Transformer with Dynamic Prompting for Adaptive Image Restoration

1
Department of School of Computer Science and Engineering (School of Artificial Intelligence), Chongqing University of Science and Technology, Chongqing 401331, China
2
Chongqing Intelligent Mathematics and Autonomous Intelligence Research Institute, Chongqing 401331, China
3
School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 401331, China
*
Author to whom correspondence should be addressed.
Mathematics 2025, 13(20), 3329; https://doi.org/10.3390/math13203329 (registering DOI)
Submission received: 4 September 2025 / Revised: 29 September 2025 / Accepted: 17 October 2025 / Published: 19 October 2025
(This article belongs to the Special Issue Intelligent Mathematics and Applications)

Abstract

High-quality image restoration (IR) is a fundamental task in computer vision, aiming to recover a clear image from its degraded version. Prevailing methods typically employ a static inference pipeline, neglecting the spatial variability of image content and degradation, which makes it difficult for them to adaptively handle complex and diverse restoration scenarios. To address this issue, we propose a novel adaptive image restoration framework named Hybrid Convolutional Transformer with Dynamic Prompting (HCTDP). Our approach introduces two key architectural innovations: a Spatially Aware Dynamic Prompt Head Attention (SADPHA) module, which performs fine-grained local restoration by generating spatially variant prompts through real-time analysis of image content and a Gated Skip-Connection (GSC) module that refines multi-scale feature flow using efficient channel attention. To guide the network in generating more visually plausible results, the framework is optimized with a hybrid objective function that combines a pixel-wise L1 loss and a feature-level perceptual loss. Extensive experiments on multiple public benchmarks, including image deraining, dehazing, and denoising, demonstrate that our proposed HCTDP exhibits superior performance in both quantitative and qualitative evaluations, validating the effectiveness of the adaptive restoration framework while utilizing fewer parameters than key competitors.
Keywords: image restoration; dynamic prompting; transformer; adaptive restoration; attention mechanism image restoration; dynamic prompting; transformer; adaptive restoration; attention mechanism

Share and Cite

MDPI and ACS Style

Zhang, J.; Chen, G.; Yang, J.; Zhang, Q.; Liu, S.; Zhang, W. Hybrid Convolutional Transformer with Dynamic Prompting for Adaptive Image Restoration. Mathematics 2025, 13, 3329. https://doi.org/10.3390/math13203329

AMA Style

Zhang J, Chen G, Yang J, Zhang Q, Liu S, Zhang W. Hybrid Convolutional Transformer with Dynamic Prompting for Adaptive Image Restoration. Mathematics. 2025; 13(20):3329. https://doi.org/10.3390/math13203329

Chicago/Turabian Style

Zhang, Jinmei, Guorong Chen, Junliang Yang, Qingru Zhang, Shaofeng Liu, and Weijie Zhang. 2025. "Hybrid Convolutional Transformer with Dynamic Prompting for Adaptive Image Restoration" Mathematics 13, no. 20: 3329. https://doi.org/10.3390/math13203329

APA Style

Zhang, J., Chen, G., Yang, J., Zhang, Q., Liu, S., & Zhang, W. (2025). Hybrid Convolutional Transformer with Dynamic Prompting for Adaptive Image Restoration. Mathematics, 13(20), 3329. https://doi.org/10.3390/math13203329

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