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In this paper, we present a novel method of no-reference image quality assessment (NR-IQA), which is to predict the perceptual quality score of a given image without using any reference image. The proposed method harnesses three functions…

Computer Vision and Pattern Recognition · Computer Science 2017-05-30 Diqi Chen , Yizhou Wang , Tianfu Wu , Wen Gao

Contemporary no-reference image quality assessment (NR-IQA) models can effectively quantify perceived image quality, often achieving strong correlations with human perceptual scores on standard IQA benchmarks. Yet, limited efforts have been…

Computer Vision and Pattern Recognition · Computer Science 2025-01-16 Weixia Zhang , Dingquan Li , Guangtao Zhai , Xiaokang Yang , Kede Ma

Existing free-energy guided No-Reference Image Quality Assessment (NR-IQA) methods still suffer from finding a balance between learning feature information at the pixel level of the image and capturing high-level feature information and the…

Computer Vision and Pattern Recognition · Computer Science 2024-12-30 Zhaoyang Wang , Bo Hu , Mingyang Zhang , Jie Li , Leida Li , Maoguo Gong , Xinbo Gao

No-reference point cloud quality assessment (NR-PCQA) aims to automatically evaluate the perceptual quality of distorted point clouds without available reference, which have achieved tremendous improvements due to the utilization of deep…

Computer Vision and Pattern Recognition · Computer Science 2024-03-28 Ziyu Shan , Yujie Zhang , Qi Yang , Haichen Yang , Yiling Xu , Jenq-Neng Hwang , Xiaozhong Xu , Shan Liu

No-reference image quality assessment (NR-IQA) aims to quantify how humans perceive visual distortions of digital images without access to their undistorted references. NR-IQA models are extensively studied in computational vision, and are…

Computer Vision and Pattern Recognition · Computer Science 2022-10-04 Weixia Zhang , Dingquan Li , Xiongkuo Min , Guangtao Zhai , Guodong Guo , Xiaokang Yang , Kede Ma

Super-resolution (SR), a classical inverse problem in computer vision, is inherently ill-posed, inducing a distribution of plausible solutions for every input. However, the desired result is not simply the expectation of this distribution,…

Computer Vision and Pattern Recognition · Computer Science 2025-04-28 Fengjia Zhang , Samrudhdhi B. Rangrej , Tristan Aumentado-Armstrong , Afsaneh Fazly , Alex Levinshtein

Diffusion-based models have recently revolutionized image generation, achieving unprecedented levels of fidelity. However, consistent generation of high-quality images remains challenging partly due to the lack of conditioning mechanisms…

Computer Vision and Pattern Recognition · Computer Science 2025-03-18 Khaled Abud , Sergey Lavrushkin , Alexey Kirillov , Dmitriy Vatolin

Despite recent advancements in latent diffusion models that generate high-dimensional image data and perform various downstream tasks, there has been little exploration into perceptual consistency within these models on the task of…

Computer Vision and Pattern Recognition · Computer Science 2025-06-03 Shreshth Saini , Ru-Ling Liao , Yan Ye , Alan C. Bovik

Image quality assessment is a fundamental problem in the field of image processing, and due to the lack of reference images in most practical scenarios, no-reference image quality assessment (NR-IQA), has gained increasing attention…

Computer Vision and Pattern Recognition · Computer Science 2023-05-17 Jinsong Shi , Pan Gao , Aljosa Smolic

No-reference (NR) image quality assessment (IQA) is an important tool in enhancing the user experience in diverse visual applications. A major drawback of state-of-the-art NR-IQA techniques is their reliance on a large number of human…

Computer Vision and Pattern Recognition · Computer Science 2023-12-11 Suhas Srinath , Shankhanil Mitra , Shika Rao , Rajiv Soundararajan

The goal of No-Reference Image Quality Assessment (NR-IQA) is to estimate the perceptual image quality in accordance with subjective evaluations, it is a complex and unsolved problem due to the absence of the pristine reference image. In…

Image and Video Processing · Electrical Eng. & Systems 2022-01-06 S. Alireza Golestaneh , Saba Dadsetan , Kris M. Kitani

Image Quality Assessment (IQA) with reference images have achieved great success by imitating the human vision system, in which the image quality is effectively assessed by comparing the query image with its pristine reference image.…

Computer Vision and Pattern Recognition · Computer Science 2023-12-04 Xudong Li , Jingyuan Zheng , Xiawu Zheng , Runze Hu , Enwei Zhang , Yuting Gao , Yunhang Shen , Ke Li , Yutao Liu , Pingyang Dai , Yan Zhang , Rongrong Ji

Diffusion models have demonstrated remarkable success in various visual generation tasks, including image, video, and 3D content generation. Preference optimization (PO) is a prominent and growing area of research that aims to align these…

Computer Vision and Pattern Recognition · Computer Science 2025-11-18 Fu-Yun Wang , Keqiang Sun , Yao Teng , Xihui Liu , Jiale Yuan , Jiaming Song , Hongsheng Li

Current no-reference image quality assessment (NR-IQA) models for enhanced images often struggle to generalize, as they tend to overfit to the distinct patterns of specific enhancement algorithms rather than evaluating genuine perceptual…

Computer Vision and Pattern Recognition · Computer Science 2026-03-23 Shiqi Gao , Kang Fu , Zitong Xu , Huiyu Duan , Xiongkuo Min , Jia Wang , Guangtao Zhai

Image Quality Assessment (IQA) models aim to predict perceptual image quality in alignment with human judgments. No-Reference (NR) IQA remains particularly challenging due to the absence of a reference image. While deep learning has…

Image and Video Processing · Electrical Eng. & Systems 2025-07-18 Rajesh Sureddi , Saman Zadtootaghaj , Nabajeet Barman , Alan C. Bovik

Image Quality Assessment (IQA) predicts perceptual quality scores consistent with human judgments. Recent RL-based IQA methods built on MLLMs focus on generating visual quality descriptions and scores, ignoring two key reliability…

Computer Vision and Pattern Recognition · Computer Science 2026-02-17 Wulin Xie , Rui Dai , Ruidong Ding , Kaikui Liu , Xiangxiang Chu , Xinwen Hou , Jie Wen

Diffusion models have made substantial advances in image generation, yet models trained on large, unfiltered datasets often yield outputs misaligned with human preferences. Numerous methods have been proposed to fine-tune pre-trained…

Computer Vision and Pattern Recognition · Computer Science 2025-05-19 Fu-Yun Wang , Yunhao Shui , Jingtan Piao , Keqiang Sun , Hongsheng Li

Recent advancements in diffusion models have notably improved the perceptual quality of generated images in text-to-image synthesis tasks. However, diffusion models often struggle to produce images that accurately reflect the intended…

Computer Vision and Pattern Recognition · Computer Science 2024-03-12 Yang Zhang , Teoh Tze Tzun , Lim Wei Hern , Tiviatis Sim , Kenji Kawaguchi

Recently, increasing interest has been drawn in exploiting deep convolutional neural networks (DCNNs) for no-reference image quality assessment (NR-IQA). Despite of the notable success achieved, there is a broad consensus that training…

Image and Video Processing · Electrical Eng. & Systems 2020-04-14 Hancheng Zhu , Leida Li , Jinjian Wu , Weisheng Dong , Guangming Shi

No-Reference Image Quality Assessment (NR-IQA) aims to develop methods to measure image quality in alignment with human perception without the need for a high-quality reference image. In this work, we propose a self-supervised approach…

Computer Vision and Pattern Recognition · Computer Science 2023-11-08 Lorenzo Agnolucci , Leonardo Galteri , Marco Bertini , Alberto Del Bimbo
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