A Benchmark of Objective Quality Metrics for HLG-Based HDR/WCG Image Coding

2020 ◽  
Author(s):  
Yasuko Sugito ◽  
Trevor Canham ◽  
Javier Vazquez-Corral ◽  
Marcelo Bertalmio
Keyword(s):  
Image Coding ◽  
Quality Metrics ◽  
Objective Quality

scholarly journals Evaluating the Coding Performance of 360° Image Projection Formats Using Objective Quality Metrics

Symmetry ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 80
Author(s):  
Ikram Hussain ◽  
Oh-Jin Kwon ◽  
Seungcheol Choi
Keyword(s):  
Image Coding ◽  
Real Life ◽  
Ground Truth ◽  
Quality Metrics ◽  
Evaluation Framework ◽  
Jpeg 2000 ◽  
Coding Gain ◽  
Objective Quality ◽  
Ground Truth Image ◽  
Coding Standards

Recently, 360° content has emerged as a new method for offering real-life interaction. Ultra-high resolution 360° content is mapped to the two-dimensional plane to adjust to the input of existing generic coding standards for transmission. Many formats have been proposed, and tremendous work is being done to investigate 360° videos in the Joint Video Exploration Team using projection-based coding. However, the standardization activities for quality assessment of 360° images are limited. In this study, we evaluate the coding performance of various projection formats, including recently-proposed formats adapting to the input of JPEG and JPEG 2000 content. We present an overview of the nine state-of-the-art formats considered in the evaluation. We also propose an evaluation framework for reducing the bias toward the native equi-rectangular (ERP) format. We consider the downsampled ERP image as the ground truth image. Firstly, format conversions are applied to the ERP image. Secondly, each converted image is subjected to the JPEG and JPEG 2000 image coding standards, then decoded and converted back to the downsampled ERP to find the coding gain of each format. The quality metrics designed for 360° content and conventional 2D metrics have been used for both end-to-end distortion measurement and codec level, in two subsampling modes, i.e., YUV (4:2:0 and 4:4:4). Our evaluation results prove that the hybrid equi-angular format and equatorial cylindrical format achieve better coding performance among the compared formats. Our work presents evidence to find the coding gain of these formats over ERP, which is useful for identifying the best image format for a future standard.

On the performance of objective quality metrics for lightfields

2021 ◽  
Vol 93 ◽  
pp. 116179
Author(s):  
Saeed Mahmoudpour ◽  
Peter Schelkens
Keyword(s):  
Quality Metrics ◽  
Objective Quality

scholarly journals Perceptually Motivated Method for Image Inpainting Comparison

2019 ◽  
Author(s):  
Иван Молодецких ◽  
Ivan Molodetskikh ◽  
Михаил Ерофеев ◽  
Mikhail Erofeev ◽  
Дмитрий Ватолин ◽  
...  
Keyword(s):  
Image Quality ◽  
Standard Method ◽  
Image Inpainting ◽  
Human Perception ◽  
Quality Metrics ◽  
Future Research ◽  
Image Quality Metrics ◽  
Objective Quality

The field of automatic image inpainting has progressed rapidly in recent years, but no one has yet proposed a standard method of evaluating algorithms. This absence is due to the problem’s challenging nature: image-­inpainting algorithms strive for realism in the resulting images, but realism is a subjective concept intrinsic to human perception. Existing objective image-­quality metrics provide a poor approximation of what humans consider more or less realistic. To improve the situation and to better organize both prior and future research in this field, we conducted a subjective comparison of nine state-­of­-the­-art inpainting algorithms and propose objective quality metrics that exhibit high correlation with the results of our comparison.

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