Adaptive Mixed-Scale Feature Fusion Network for Blind AI-Generated Image Quality Assessment

TL;DR

This paper introduces AMFF-Net, a novel blind AI-generated image quality assessment model that evaluates images based on visual quality, authenticity, and consistency using multi-scale features and adaptive fusion, outperforming existing methods.

Contribution

The paper proposes a new multi-scale feature fusion network with adaptive weighting for blind IQA of AI-generated images, incorporating text-image semantic alignment.

Findings

AMFF-Net outperforms nine state-of-the-art blind IQA methods.

Multi-scale input strategy improves assessment accuracy.

Adaptive feature fusion effectively combines local and global features.

Abstract

With the increasing maturity of the text-to-image and image-to-image generative models, AI-generated images (AGIs) have shown great application potential in advertisement, entertainment, education, social media, etc. Although remarkable advancements have been achieved in generative models, very few efforts have been paid to design relevant quality assessment models. In this paper, we propose a novel blind image quality assessment (IQA) network, named AMFF-Net, for AGIs. AMFF-Net evaluates AGI quality from three dimensions, i.e., "visual quality", "authenticity", and "consistency". Specifically, inspired by the characteristics of the human visual system and motivated by the observation that "visual quality" and "authenticity" are characterized by both local and global aspects, AMFF-Net scales the image up and down and takes the scaled images and original-sized image as the inputs to obtain multi-scale features. After that, an Adaptive Feature Fusion (AFF) block is used to adaptively fuse the multi-scale features with learnable weights. In addition, considering the correlation between the image and prompt, AMFF-Net compares the semantic features from text encoder and image encoder to evaluate the text-to-image alignment. We carry out extensive experiments on three AGI quality assessment databases, and the experimental results show that our AMFF-Net obtains better performance than nine state-of-the-art blind IQA methods. The results of ablation experiments further demonstrate the effectiveness of the proposed multi-scale input strategy and AFF block.