This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility:




Decoupled style structure in Fourier domain method improves raw to sRGB mapping

Decoupled style structure in Fourier domain method improves raw to sRGB mapping
The results image from ZRRdataset. The last row showcases the color histogram of the image. Credit: Zhang Jie

A team of researchers led by Professor Xie Chengjun and Associate Professor Zhang Jie at Hefei Institutes of Physical Science (HFIPS), Chinese Academy of Sciences (CAS), unveiled Fourier-ISP, a novel deep-learning based framework for RAW-to-sRGB image conversion.

This approach was accepted for publication in the 2024 proceedings of the Association for the Advancement of Artificial Intelligence (AAAI).

Converting RAW images to sRGB images enhances the visual appeal and usability of smartphone photography. However, current methods struggle with color and spatial structure accuracy, especially with resolution and image type variations. Combining color mapping and produces suboptimal results due to the complex interplay between and structure within the images.

To overcome these challenges, the team has developed a novel called Fourier-ISP. Inspired by the Image Signal Processing pipeline, this approach separates the style and structure of the image within the frequency domain.

"It enabled independent optimization," said Zhang Jie, member of the team.

Fourier-ISP consists of three subnetworks: one for refining the structural details, another for learning accurate colors, and a third for blending these elements seamlessly. This decoupling of style and structure enables enhanced performance in image conversion, producing sharper and more accurate color and structural details.

Extensive evaluations across varied datasets confirm that Fourier-ISP realizes state-of-the-art results in qualitative and quantitative assessments, surpassing existing methods in precision and detail reproduction. It demonstrates robust transferability and effectiveness in handling both structural and style information, ensuring enhanced color reproduction and texture preservation. Notably, Fourier-ISP achieved an impressive PSNR improvement of 0.17dB in the ZRR dataset.

This framework introduces a novel insight into the field of image processing, showcasing the potential of style-structure decoupling in achieving high-fidelity image conversion, particularly in mobile photography, according to the team.

The paper is available on the arXiv preprint server.

More information: Xuanhua He et al, Enhancing RAW-to-sRGB with Decoupled Style Structure in Fourier Domain, arXiv (2024). DOI: 10.48550/arxiv.2401.02161

Journal information: arXiv
Provided by Hefei Institutes of Physical Science, Chinese Academy of Sciences
Citation: Decoupled style structure in Fourier domain method improves raw to sRGB mapping (2024, January 19) retrieved 18 April 2024 from
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

Novel frequency-adaptive methods enhance remote sensing image processing


Feedback to editors