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This paper reports on the NTIRE 2021 challenge on perceptual image quality assessment (IQA), held in conjunction with the New Trends in Image Restoration and Enhancement workshop (NTIRE) workshop at CVPR 2021. As a new type of image…

In contrast with traditional video, omnidirectional video enables spherical viewing direction with support for head-mounted displays, providing an interactive and immersive experience. Unfortunately, to the best of our knowledge, there are…

Image and Video Processing · Electrical Eng. & Systems 2019-07-16 Mai Xu , Chen Li , Zulin Wang , Zhenzhong Chen , Zhenyu Guan

Virtual Reality (VR) and its applications have attracted significant and increasing attention. However, the requirements of much larger file sizes, different storage formats, and immersive viewing conditions pose significant challenges to…

Image and Video Processing · Electrical Eng. & Systems 2022-04-06 Meixu Chen , Yize Jin , Todd Goodall , Xiangxu Yu , Alan C. Bovik

Generative adversarial networks (GANs) have achieved impressive results today, but not all generated images are perfect. A number of quantitative criteria have recently emerged for generative model, but none of them are designed for a…

Image and Video Processing · Electrical Eng. & Systems 2020-07-15 Shuyang Gu , Jianmin Bao , Dong Chen , Fang Wen

Completely blind video quality assessment (VQA) refers to a class of quality assessment methods that do not use any reference videos, human opinion scores or training videos from the target database to learn a quality model. The design of…

Image and Video Processing · Electrical Eng. & Systems 2024-06-25 Shankhanil Mitra , Rajiv Soundararajan

We study the visual quality judgments of human subjects on digital human avatars (sometimes referred to as "holograms" in the parlance of virtual reality [VR] and augmented reality [AR] systems) that have been subjected to distortions. We…

Image and Video Processing · Electrical Eng. & Systems 2024-10-04 Yu-Chih Chen , Avinab Saha , Alexandre Chapiro , Christian Häne , Jean-Charles Bazin , Bo Qiu , Stefano Zanetti , Ioannis Katsavounidis , Alan C. Bovik

The goal of full-reference image quality assessment (FR-IQA) is to predict the quality of an image as perceived by human observers with using its pristine, reference counterpart. In this study, we explore a novel, combined approach which…

Computer Vision and Pattern Recognition · Computer Science 2020-12-04 Domonkos Varga

Research on image quality assessment (IQA) remains limited mainly due to our incomplete knowledge about human visual perception. Existing IQA algorithms have been designed or trained with insufficient subjective data with a small degree of…

Computer Vision and Pattern Recognition · Computer Science 2020-09-29 Lucie Lévêque , Ji Yang , Xiaohan Yang , Pengfei Guo , Kenneth Dasalla , Leida Li , Yingying Wu , Hantao Liu

In this paper, we propose an image quality transformer (IQT) that successfully applies a transformer architecture to a perceptual full-reference image quality assessment (IQA) task. Perceptual representation becomes more important in image…

Computer Vision and Pattern Recognition · Computer Science 2021-05-06 Manri Cheon , Sung-Jun Yoon , Byungyeon Kang , Junwoo Lee

Generative models for image restoration, enhancement, and generation have significantly improved the quality of the generated images. Surprisingly, these models produce more pleasant images to the human eye than other methods, yet, they may…

Image and Video Processing · Electrical Eng. & Systems 2022-04-28 Marcos V. Conde , Maxime Burchi , Radu Timofte

Blind image quality assessment (BIQA) remains a very challenging problem due to the unavailability of a reference image. Deep learning based BIQA methods have been attracting increasing attention in recent years, yet it remains a difficult…

Computer Vision and Pattern Recognition · Computer Science 2017-12-06 Hui Zeng , Lei Zhang , Alan C. Bovik

The advent of AI has influenced many aspects of human life, from self-driving cars and intelligent chatbots to text-based image and video generation models capable of creating realistic images and videos based on user prompts…

Computer Vision and Pattern Recognition · Computer Science 2024-10-22 Abhijay Ghildyal , Yuanhan Chen , Saman Zadtootaghaj , Nabajeet Barman , Alan C. Bovik

Subjective perceptual image quality can be assessed in lab studies by human observers. Objective image quality assessment (IQA) refers to algorithms for estimation of the mean subjective quality ratings. Many such methods have been…

Computer Vision and Pattern Recognition · Computer Science 2019-08-20 Markus Wagner , Hanhe Lin , Shujun Li , Dietmar Saupe

Traditional image quality assessment (IQA) methods rely on mean opinion scores (MOS), which are resource-intensive to collect and fail to provide interpretable, localized feedback on specific image distortions. We overcome these limitations…

Computer Vision and Pattern Recognition · Computer Science 2026-05-05 Fadeel Sher Khan , Long N. Le , Abhinau K. Venkataramanan , Seok-Jun Lee , Hamid R. Sheikh

Omnidirectional image quality assessment (OIQA) has been widely investigated in the past few years and achieved much success. However, most of existing studies are dedicated to solve the uniform distortion problem in OIQA, which has a…

Image and Video Processing · Electrical Eng. & Systems 2025-01-22 Jiebin Yan , Jiale Rao , Junjie Chen , Ziwen Tan , Weide Liu , Yuming Fang

An omnidirectional image (ODI) enables viewers to look in every direction from a fixed point through a head-mounted display providing an immersive experience compared to that of a standard image. Designing immersive virtual reality systems…

Computer Vision and Pattern Recognition · Computer Science 2019-08-14 Cagri Ozcinar , Aakanksha Rana , Aljosa Smolic

Objective quality assessment of stereoscopic panoramic images becomes a challenging problem owing to the rapid growth of 360-degree contents. Different from traditional 2D image quality assessment (IQA), more complex aspects are involved in…

Image and Video Processing · Electrical Eng. & Systems 2019-09-05 Jiahua Xu , Ziyuan Luo , Wei Zhou , Wenyuan Zhang , Zhibo Chen

Omnidirectional image, also called 360-degree image, is able to capture the entire 360-degree scene, thereby providing more realistic immersive feelings for users than general 2D image and stereoscopic image. Meanwhile, this feature brings…

Image and Video Processing · Electrical Eng. & Systems 2025-02-27 Jiebin Yan , Ziwen Tan , Yuming Fang , Jiale Rao , Yifan Zuo

Blind image quality assessment (BIQA) aims to automatically evaluate the perceived quality of a single image, whose performance has been improved by deep learning-based methods in recent years. However, the paucity of labeled data somewhat…

Computer Vision and Pattern Recognition · Computer Science 2023-03-24 Kai Zhao , Kun Yuan , Ming Sun , Mading Li , Xing Wen

Image quality assessment (IQA) represents a pivotal challenge in image-focused technologies, significantly influencing the advancement trajectory of image processing and computer vision. Recently, IQA has witnessed a notable surge in…

Computer Vision and Pattern Recognition · Computer Science 2025-02-13 Chengqian Ma , Zhengyi Shi , Zhiqiang Lu , Shenghao Xie , Fei Chao , Yao Sui