一种快速的多尺度多输入编码树单元互补分类网络

唐述; 周广义; 谢显中; 赵瑜; 杨书丽

doi:10.11999/JEIT240223

一种快速的多尺度多输入编码树单元互补分类网络

doi: 10.11999/JEIT240223

重庆邮电大学计算机科学与技术学院重庆 400065

基金项目: 国家自然科学基金(61601070)，重庆市自然科学基金面上项目(CSTB2023NSCQ-MSX0680)，重庆市教育委员会科学技术研究重大项目(KJZD-M202300101)，重庆邮电大学博士研究生创新人才项目(BYJS202217)

详细信息

作者简介:
唐述：男，副教授，研究方向为视频信号处理、低水平视觉任务、图像超分辨率重建、模糊图像复原

周广义：男，硕士，研究方向为视频信号处理

谢显中：男，教授，研究方向为信号与信息处理、计算机通信方向、通信与信息系统

赵瑜：男，硕士，研究方向为视频信号处理

杨书丽：女，博士，研究方向为图像超分辨率重建

通讯作者:
唐述　tangshu@cqupt.edu.cn

中图分类号: TN939.1; TP391.4
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- PDF下载量: 18
- 被引次数: 0
出版历程
- 收稿日期: 2024-03-29
- 修回日期: 2024-07-21
- 网络出版日期: 2024-08-03
- 刊出日期: 2024-09-26

A Multi-scale-multi-input Complementation Classification Network for Fast Coding Tree Unit Partition

College of Computer Science and Technology, Chongqing University of Posts and Telecommunications, Chongqing 400064, China

Funds: The National Natural Science Foundation of China (61601070), Chongqing Natural Science Foundation General Project (CSTB2023NSCQ-MSX0680), The Major Project of Science and Technology Research of Chongqing Education Commission (KJZD-M202300101), The Innovative Talents Project for Doctoral students of Chongqing University of Posts and Telecommunications (BYJS202217)

摘要

摘要: 深度神经网络(DNN)已被广泛应用到高效视频编码(HEVC)编码树单元(CTU)的深度划分中，显著降低了编码复杂度。然而现有的基于DNN的CTU深度划分方法却忽略了不同尺度编码单元(CU)间的特征相关性和存在着分类错误累积等缺陷。基于此，该文提出一种多尺度多输入的互补分类网络(MCCN)来实现更高效且更准确的HEVC帧内CTU深度划分。首先，提出一种多尺度多输入的卷积神经网络(MMCNN)，通过融合不同尺度CU的特征来建立CU间的关联，进一步提升网络的表达能力。然后，提出一种互补的分类策略(CCS)，通过结合二分类和三分类，并采用投票机制来决定CTU中每个CU的最终深度值，有效避免了现有方法中存在的错误累积效应，实现了更准确的CTU深度划分。大量的实验结果表明，该文所提MCCN能够更大程度降低HEVC编码的复杂度，同时实现更准确的CTU深度划分: 仅以增加3.18%的平均增量比特率(BD-BR)为代价，降低了71.49%的平均编码复杂度。同时，预测32×32 CU和16×16 CU的深度准确率分别提升了0.65%～0.93%和2.14%～9.27%。
- 深度神经网络 /
- 帧内高效视频编码 /
- 特征表示 /
- 编码树单元深度划分 /
- 多尺度多输入 /
- 互补分类
Abstract: Deep Neural Networks (DNN) have been widely applied to Coding Tree Unit(CTU) partition of intra-mode High Efficiency Video Coding(HEVC) for reducing the HEVC encoding complexity, however, existing DNN-based CTU partition methods always neglect the correlation of features between Coding Units (CU) at different scales and suffer from the accumulation of classification errors. Therefore, in this paper, a Multi-scale-multi-input Complementation Classification Network (MCCN) for faster and more accurate CTU partition is proposed. First, a Multi-scale Multi-input Convolutional Neural Network (MMCNN) is proposed, which builds up the correlation of features between CUs at different scales by fusing multi-scale CU features. Therefore, our MMCNN possess more powerful representation abilities. Second, a Complementary Classification Strategy (CCS) is proposed, in which the final depth prediction results for each CU are determined by combining the results of multi-classification with the results of binary classification and triplex classification with the voting mechanism. The proposed CCS avoids the accumulation of classification errors and achieves more accurate CTU partition. Extensive experiments demonstrate that our MCCN achieves lower HEVC encoding complexity and more accurate CTU partition: reduce the average encoding complexity by 71.49% only at the cost of a 3.18% average Bjøntegaard Delta Bit-Rate(BD-BR). And the average accuracies of 32×32 CU depth prediction and 16×16 CU depth prediction are increased by 0.65%～0.93% and 2.14%～9.27% respectively.
- Deep Neural Networks(DNN) /
- Intra-mode High Efficiency Video Coding(HEVC) /
- Features Representation /
- Coding Tree Unit(CTU) partition /
- Multi-scale-multi-input /
- Complementation classification

HTML全文

图 1 本文所提CCS

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图 2 二分类MMCNN

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图 3 三分类MMCNN

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表 1 MMCNN的有效性消融实验(%)

模型	平均BD-BR	平均ΔT
MCCN	3.18	71.49
MCCN-NoQP	9.80	58.60
MCCN-OneScale	11.50	64.30

下载: 导出CSV

表 2 消融实验：不同大小CU的深度划分平均准确率比较(%)

	MCCN	MCCN-SBCS
64 × 64 CU	90.30	88.05
32× 32 CU	87.55	86.51
16× 16 CU	89.69	85.71

下载: 导出CSV

表 3 MCCN和MCCN-SBC的平均BD-BR和平均ΔT比较(%)

模型	平均BD-BR	平均ΔT
MCCN	3.18	71.49
MCCN-SBCS	7.86	67.00

下载: 导出CSV

表 4 平均准确率比较(其中最好的性能已加粗标记)(%)

	本文	文献[12]	文献[15]
64 × 64 CU	90.30	90.98	91.18
32× 32 CU	87.55	86.62	86.90
16×16 CU	89.69	80.42	87.55

下载: 导出CSV

表 5 所有方法在JCT-VC标准视频测试集上的平均BD-BR和平均ΔT比较(其中最好的性能已加粗标记)(%)

指标	本文方法	2017年	2018年	2023年	2022年	2021年	2022年	2021年
指标	本文方法	文献[11]	文献[12]	文献[13]	文献[14]	文献[15]	文献[16]	文献[17]
BD-BR	3.18	2.21	2.25	1.94	2.04	2.02	4.27	1.81
ΔT	71.49	62.25	61.85	64.05	59.71	65.55	70.39	60.63

下载: 导出CSV

参考文献(26)

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