Attention-Guided NIR Image Colorization via Adaptive Fusion of Semantic and Texture Clues

• URL: http://arxiv.org/abs/2107.09237v1
• Date: Tue, 20 Jul 2021 03:00:51 GMT
• Title: Attention-Guided NIR Image Colorization via Adaptive Fusion of Semantic and Texture Clues
• Authors: Xingxing Yang, Jie Chen, Zaifeng Yang, and Zhenghua Chen
• Abstract summary: Near infrared (NIR) imaging has been widely applied in low-light imaging scenarios. It is difficult for human and algorithms to perceive the real scene in the colorless NIR domain. We propose a novel Attention-based NIR image colorization framework via Adaptive Fusion of Semantic and Texture clues.
• Score: 6.437931036166344
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Near infrared (NIR) imaging has been widely applied in low-light imaging scenarios; however, it is difficult for human and algorithms to perceive the real scene in the colorless NIR domain. While Generative Adversarial Network (GAN) has been widely employed in various image colorization tasks, it is challenging for a direct mapping mechanism, such as a conventional GAN, to transform an image from the NIR to the RGB domain with correct semantic reasoning, well-preserved textures, and vivid color combinations concurrently. In this work, we propose a novel Attention-based NIR image colorization framework via Adaptive Fusion of Semantic and Texture clues, aiming at achieving these goals within the same framework. The tasks of texture transfer and semantic reasoning are carried out in two separate network blocks. Specifically, the Texture Transfer Block (TTB) aims at extracting texture features from the NIR image's Laplacian component and transferring them for subsequent color fusion. The Semantic Reasoning Block (SRB) extracts semantic clues and maps the NIR pixel values to the RGB domain. Finally, a Fusion Attention Block (FAB) is proposed to adaptively fuse the features from the two branches and generate an optimized colorization result. In order to enhance the network's learning capacity in semantic reasoning as well as mapping precision in texture transfer, we have proposed the Residual Coordinate Attention Block (RCAB), which incorporates coordinate attention into a residual learning framework, enabling the network to capture long-range dependencies along the channel direction and meanwhile precise positional information can be preserved along spatial directions. RCAB is also incorporated into FAB to facilitate accurate texture alignment during fusion. Both quantitative and qualitative evaluations show that the proposed method outperforms state-of-the-art NIR image colorization methods.

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