<![CDATA[Background: The rapid growth of digital media has increased the demand for automated image aesthetic assessment (IAA) in social media, creative industries, and e-commerce platforms. Although Vision Transformer (ViT)-based models have demonstrated promising performance, most existing approaches rely primarily on spatial representations while overlooking frequency-domain information, which captures complementary characteristics such as sharpness, texture, noise patterns, and bokeh effects. Objective: This study proposes a Dual-Branch Late Fusion FFT-ViT architecture with concatenation-based fusion as an approach for integrating dual-domain representations to improve photo aesthetic assessment (PAA). Methods: The proposed architecture consists of two parallel branches. The RGB branch employs a Vision Transformer (ViT-Small) to extract spatial and compositional features, while the FFT branch utilizes ViT-Tiny to capture frequency-domain characteristics associated with texture, sharpness, and image details. The extracted features from both branches are fused using a concatenation strategy before being passed to the regression layer. Results: The proposed Dual-Branch FFT-ViT with concatenation fusion achieved the best performance, obtaining a PLCC of 0.7336, SRCC of 0.7347, MSE of 0.0193, MAE of 0.1117, and RMSE of 0.1388. Compared with the RGB-only ViT baseline, the proposed model improved the PLCC score by 0.0124, demonstrating the effectiveness of integrating spatial and frequency-domain features for aesthetic score prediction. Conclusion: This study demonstrates that integrating spatial and frequency-domain representations through a dual-branch Vision Transformer architecture enhances photo aesthetic assessment performance.]]>
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