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南京大学联合大连理工大学发表渐进式光谱解耦实现超高清图像复原框架

  • 2026-05-12 02:13:14
南京大学联合大连理工大学发表渐进式光谱解耦实现超高清图像复原框架

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01

工作速览

超高清(UHD)图像复原因分辨率高、内容复杂、细节丰富,长期面临巨大技术挑战。为攻克这些难题,我们从渐进式光谱视角深度解析复原过程,将复杂的超高清复原任务拆解为三个递进阶段:零频增强、低频复原、高频精修

南京大学联合大连理工大学、腾讯优图、中国移动研究院CVPR 在线发表题为From Zero to Detail: Deconstructing Ultra-High-Definition Image Restoration from Progressive Spectral Perspective”的研究论文。该研究提出全新框架 ERR,由三大协同子网络构成:

零频增强器(ZFE):融合全局先验,学习全局映射关系;低频复原器(LFR):专注复原低频信息,重点重建图像粗粒度主体内容;高频精修器(HFR):搭载自研频窗型柯尔莫哥洛夫 - 阿诺德网络(FW‑KAN),精细优化纹理与细节,输出高质量复原图像。

在多项超高清任务中,本方法性能显著超越现有方案;大量消融实验也充分验证了各模块的有效性。

代码地址:https://github.com/NJU-PCALab/ERR

02

匠心独运


超高清(UHD)成像技术飞速发展,已在众多领域得到广泛关注与应用。然而,在低光、雨天、雾霾等复杂恶劣环境下拍摄的超高清图像,往往会出现严重画质退化,极大影响使用效果。本文正是围绕超高清图像复原这一关键课题展开深入探索。

图 1 该方法与当前最优(SOTA)方法的视觉效果对比

近年来,深度学习技术取得显著成功,大量基于卷积神经网络(CNN)与 Transformer 的学习型方法被相继提出,用于应对图像复原难题。当前主流的顶尖方法大多通过搭建更复杂的网络结构提升性能,但面对超高清图像的超高分辨率、高密度像素特性,这些先进方案往往难以发挥理想效果。

为此,一批面向超高清图像复原的专用方法陆续问世。例如 LLformer 借助 Transformer 架构取得亮眼表现,却因计算成本过高,无法在边缘设备上高效完成全分辨率推理;UHDFour 通过 8 倍下采样降低分辨率,实现了端侧全分辨率推理;UHDformer 则提出校正 Transformer,用高分辨率特征引导低分辨率复原。尽管这些方法依靠下采样降低了计算量,但 “下采样–增强–上采样” 的固定范式,不可避免地造成图像关键信息丢失。再加上超高清图像本身分辨率极高、内容丰富、结构细节繁杂,现有方法很难兼顾高效性与复原质量。

图 2 核心研究动机。基于 (a)(b) 中的观测结果,研究团队将复杂的超高清图像复原问题解构为三个递进式阶段零频增强、低频复原与高频精修

为深度破解超高清图像复原难题,研究团队创新性地采用渐进式频域解耦思路,系统分析不同频率分量在复原过程中的作用。

研究人员首先通过离散余弦变换(DCT),将退化图像与真实清晰图映射到频域,并交换代表全局信息的(0,0)位置零频分量,再经逆离散余弦变换(IDCT)重建回空间域。结果显示,零频分量承载图像全局与平均特征,对复原初期效果起到决定性作用 —— 即便学会完美的非零频分量,也无法得到可接受的复原结果。

随后,研究团队逐步扩大交换的频域范围,进一步发现:填充低频分量可快速恢复图像主体结构与内容,注入高频信息则能精细优化纹理与细节。

基于以上关键发现,研究团队将复杂的超高清图像复原任务,解构为三个循序渐进的核心阶段:零频增强、低频复原、高频精修,分别负责学习全局映射、重建粗粒度主体内容、优化细粒度纹理细节。

依托这一全新思路,团队提出了ERR 创新框架,由三大协同工作的子网络构成:

    零频增强器(ZFE):融入全局先验,专注强化图像全局信息;

    低频复原器(LFR):进一步复原低频信息,重点重建图像主体内容;

    高频精修器(HFR):搭载团队自研的频窗型柯尔莫哥洛夫 - 阿诺德网络(FW-KAN),精细打磨图像细节与纹理。

    为进一步提升性能,研究团队还为零频增强器设计了全局感知 Transformer 模块(GPTB),更高效地捕捉全局特征;为高频精修器定制 FW-KAN,专门强化细粒度信息还原能力,显著提升图像质感与清晰度。

    大量对比实验表明,ERR 框架在多项超高清复原任务中,性能显著超越以往所有专用方法;充分的消融实验也逐一验证了各设计模块的有效性。

    图 3 所提ERR 方法整体框架。基于渐进式频域分析思路,ERR 由三个协同工作的子网络构成:零频增强器(ZFE)、低频复原器(LFR)、高频精修器(HFR)

    03

    卓越性能


    图 4 在 UHD-LL 数据集 [21] 上与其他当前最优(SOTA)方法的视觉效果对比

    参考:

    https://arxiv.org/pdf/2503.13165


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    1. CONNECT:[ UseTime:0.000578s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000838s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000292s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000297s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000677s ]
    6. SELECT * FROM `set` [ RunTime:0.000236s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000715s ]
    8. SELECT * FROM `article` WHERE `id` = 547140 LIMIT 1 [ RunTime:0.000934s ]
    9. UPDATE `article` SET `lasttime` = 1778889841 WHERE `id` = 547140 [ RunTime:0.003399s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000324s ]
    11. SELECT * FROM `article` WHERE `id` < 547140 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000674s ]
    12. SELECT * FROM `article` WHERE `id` > 547140 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000535s ]
    13. SELECT * FROM `article` WHERE `id` < 547140 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003136s ]
    14. SELECT * FROM `article` WHERE `id` < 547140 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002209s ]
    15. SELECT * FROM `article` WHERE `id` < 547140 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003463s ]
    0.100551s