当前位置:首页>南京>南京大学王利民团队 | 光流稳住运动,扩散模型守住细节:MoG运动感知插帧方法

南京大学王利民团队 | 光流稳住运动,扩散模型守住细节:MoG运动感知插帧方法

  • 2026-05-31 12:25:17
南京大学王利民团队 | 光流稳住运动,扩散模型守住细节:MoG运动感知插帧方法

研究团队

张国珍、朱宇涵:南京大学软件新技术国家重点实验室
崔玉涛、赵晓彤、马凯:腾讯 PCG
王利民:南京大学、上海人工智能实验室

#插帧#提升帧率#视频增强#光流#扩散模型#视频生成#计算机视觉#人工智能

引用本文: Zhang G Z, Zhu Y H, Cui Y T, et al. Motion-aware generative frame interpolation. Sci China Inf Sci, 2026, 69(5): 150101, https://doi.org/10.1007/s11432-025-4920-3

研究意义

手机拍体育、舞台或孩子跑动,原始素材往往只有30帧;想做流畅一点的回放,或者把普通片源提升帧率到更高刷新率,背后都要靠插帧--在相邻两幅画面之间再算出若干中间帧。老电影修复、监控补帧、剪辑里做慢动作,其实也是同一类问题:时间轴上「缺了几格」,算法得猜出来,还不能让人一眼看出假。
做插帧,行业里长期有两条路。一条路是光流:先估计像素怎么动,再按运动场去「搬运」图像。优点是轨迹清楚时,整体很顺;缺点是人物交错、头发飘、衣服褶子一大,光流就容易估不准,画面里便出现糊块、重影、拉丝。另一条路是这两年很热的大视频生成模型:用扩散模型从噪声里画」出中间帧,复杂纹理有时更耐看;可它未必严格照着首尾两帧走,常见的是运动发飘、物体对不齐--毕竟预训练阶段并没有专门把「两帧之间的对应关系」教到很细。
两条路各有利弊,实际业务里却常常希望又顺又真:运动别乱跳,边缘别糊成一片,同时别跟输入的首尾帧「打架」。这项工作想解决的就是这个折中难题:在真实拍摄和动画素材两类场景里,把光流提供的运动线索和扩散模型的生成能力接到一起,让插帧结果更稳、更干净,也方便后续做提升帧率、慢放等应用。

图1 同一段素材里,不同方法插帧后的观感差别一眼能看出来:有的中间帧边缘发虚,有的动作「拖尾」。 MoG 这边,运动相对利落,人物和背景的轮廓也更贴原片。(论文 Fig.1,节选)

本文工作

论文里把方法叫作 MoG (Motion-aware Generative frame interpolation),可以直译成 「运动感知的生成式插帧」。实现上并没有从零搭一个新网络,而是站在现成的视频扩散插帧模型肩膀上:真实场景用DynamiCrafter,动画场景用ToonCrafter。团队额外接了一条光流插帧支路,专门估计「从首帧到中间帧、从尾帧到中间帧」的中间光流,相当于给扩散模型递一张运动草图;草图哪里画得准,生成就跟着走;哪里画歪了,就靠扩散那半边自己收一收。
具体怎么接进去,文中有张总览图(Fig.2)。大意是:光流对齐后的信息不只塞在一个地方,而是同时在潜空间和网络中间特征两层往里送,让模型从「底图」到「细节」都能感到运动约束。设计上刻意把引导主要放在编码器一侧,解码器那边少绑手脚,这样光流带偏了的时候,后半段还有机会把纹理拉回来。训练时也没有大动干戈:主要微调空间卷积一类层,时间相关的模块尽量冻住,免得把大模型原来学会的时序本领冲掉。和再挂一个笨重的ControlNet式分支相比,这种改法更轻,也更利于保住预训练权重里的生成质感。

图2 方法管线一览:先由光流分支给出中间运动场,再把对齐后的表征送进扩散模型;注入点分两层,且偏编码器侧,给后面解码留余地(论文 Fig.2)

若用审稿人爱看的三点来概括,可以是: (一)潜变量+特征双层注入,光流信息走得进、散得开; (二)编码器注入配合选择性微调,纠错有空间、老本行尽量不丢; (三)在常用LDM结构里就能落地,工程上相对好跟现有管线对接。

图3 复杂运动区域往往最考验插帧:单靠光流容易糊,单靠生成基线又可能跟输入帧对不齐。MoG 把两边的长处叠在一起,对比如图所示。(论文 Fig. 3)

实验结果

实验分几块。训练数据是团队按与基线可比的方式自建的,分辨率512x320,每条样本16帧,采样间隔等细节与DynamiCrafter/ToonCrafter 原文设置对齐,避免「换了数据偷偷占便宜」的质疑。评测除了自建的VFIBench(含实拍与动画各一百段量级),也在公开的Davis-7上跑了一轮,和光流类、生成类若干代表方法并排比。

图4 实拍场景下与多种生成式插帧方法的并排对比;放大看衣褶、发丝、运动物体边缘,差别会更明显。(论文 Fig.4)

肉眼看图(Fig.1、Fig.4),MoG的中间帧在运动连贯性和纹理忠实度上往往更耐看:少那种整块涂抹的感觉,也少突然「换脸式」的跳变。数字指标上,PSNR、SSIM、LPIPS、FID,FVD 以及VBench里抽出来的一组子项都做了汇报;生成式方法那一栏里,MoG整体是往上走的。另有一组实验把「首尾之间要插帧的步数」拉长缩短--相当于模拟不同提升帧率倍数下任务难度变化--曲线在Fig.5,可以看到难度上去之后,优势并没有立刻塌掉。

图5 插值步数变化(可理解为提升帧率任务里「中间要补多少格」)对难度的影响:步数越多越难,MoG 的PSNR/SSIM 等仍相对稳定。(论文 Fig.5)

此外做了小规模用户主观打分: 请参与者从运动是否自然、时间是否连贯、是否像原图、总体观感等维度挑选更喜欢的结果,MoG的得票明显集中。推理耗时也和当下主流生成式插帧方案在同量级,没有为了画质把延迟抬到不可用。
代码和更多视频对比见 https://mcg-nju.g1thub.1o/MoG_Web/
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  1. CONNECT:[ UseTime:0.000674s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000609s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002999s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001107s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000588s ]
  6. SELECT * FROM `set` [ RunTime:0.002487s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000602s ]
  8. SELECT * FROM `article` WHERE `id` = 563493 LIMIT 1 [ RunTime:0.005404s ]
  9. UPDATE `article` SET `lasttime` = 1780455584 WHERE `id` = 563493 [ RunTime:0.038654s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000315s ]
  11. SELECT * FROM `article` WHERE `id` < 563493 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000496s ]
  12. SELECT * FROM `article` WHERE `id` > 563493 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000511s ]
  13. SELECT * FROM `article` WHERE `id` < 563493 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001007s ]
  14. SELECT * FROM `article` WHERE `id` < 563493 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002859s ]
  15. SELECT * FROM `article` WHERE `id` < 563493 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014222s ]
0.222037s