基于混合生成对抗网络的多视角图像生成算法

卫星; 李佳; 孙晓; 刘邵凡; 陆阳

doi:10.16383/j.aas.c190743

基于混合生成对抗网络的多视角图像生成算法

doi: 10.16383/j.aas.c190743

卫星^1,,
李佳^1,,
孙晓^1,,
刘邵凡^1,,
陆阳^1,

1.
合肥工业大学计算机与信息学院合肥 230601

基金项目: 2020年安徽省自然科学基金联合基金(2008085UD08), 安徽省重点研发计划项目(201904d08020008, 202004a05020004), 合肥工业大学智能制造技术研究院智能网联及新能源汽车技术成果转化及产业化项目(IMIWL2019003, IMIDC2019002)资助

详细信息

作者简介:
卫星：合肥工业大学副教授. 2009年于中国科技大学获得博士学位. 主要研究方向为深度学习与物联网工程, 无人驾驶解决方案. E-mail: weixing@hfut.edu.cn

李佳：合肥工业大学计算机与信息学院硕士研究生. 主要研究方向为自然语言处理, 情感对话生成. E-mail: lijiajia@mail.hfut.edu.cn

孙晓：博士, 合肥工业大学计算机与信息学院情感计算研究所副教授. 主要研究方向为情感计算, 自然语言处理, 机器学习与人机交互, 本文通信作者. E-mail: sunx@hfut.edu.cn

刘邵凡：合肥工业大学硕士研究生. 2018年于合肥工业大学获得学士学位. 主要研究方向为目标检测和领域自适应. E-mail: frank-uzi@hotmail.com

陆阳：合肥工业大学教授. 2002年于合肥工业大学获得博士学位. 主要研究方向为物联网工程和分布式控制系统. E-mail: luyang.hf@126.com

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出版历程
- 收稿日期: 2019-10-25
- 录用日期: 2020-02-23
- 网络出版日期: 2021-10-21
- 刊出日期: 2021-11-18

Cross-view Image Generation via Mixture Generative Adversarial Network

WEI Xing^1
,,
LI Jia^1
,,
SUN Xiao^1
,,
LIU Shao-Fan^1
,,
LU Yang^1
,

1.
School of Computer and Information, Hefei University of Technology, Hefei 230601

Funds: Supported by Joint Fund of Natural Science Foundation of Anhui Province in 2020 (2008085UD08), Anhui Provincial Key Research and Development Program (201904d08020008, 202004a05020004), and Intelligent Networking and New Energy Vehicle Special Project of Intelligent Manufacturing Institute of Hefei University of Technology (IMIWL2019003, IMIDC2019002)

More Information

Author Bio:
WEI Xing　Associate professor at Hefei University of Technology. He received his Ph.D. degree from University of Science and Technology of China in 2009. His research interest covers deep learning and internet of things engineering, and driverless solutions

LI Jia　Master student at the School of Computer and Information, Hefei University of Technology. His research interest covers natural language processing and emotional conversation generation

SUN Xiao　Ph.D., associate professor at the Institute of Affective Computing, Hefei University of Technology. His research interest covers affective computing, natural language processing, machine learning and human-machine interaction. Corresponding author of this paper

LIU Shao-Fan　Master student at Hefei University of Technology. He received his bachelor degree from Hefei University of Technology in 2018. His research interest covers object detection and domain adaptation

LU Yang　Professor at Hefei University of Technology. He received his Ph.D. degree from Hefei University of Technology in 2002. His research interest covers IOT (internet of things) engineering and distributed control system

摘要

摘要: 多视角图像生成即基于某个视角图像生成其他多个视角图像, 是多视角展示和虚拟现实目标建模等领域的基本问题, 已引起研究人员的广泛关注. 近年来, 生成对抗网络(Generative adversarial network, GAN)在多视角图像生成任务上取得了不错的成绩, 但目前的主流方法局限于固定领域, 很难迁移至其他场景, 且生成的图像存在模糊、失真等弊病. 为此本文提出了一种基于混合对抗生成网络的多视角图像生成模型ViewGAN, 它包括多个生成器和一个多类别判别器, 可灵活迁移至多视角生成的多个场景. 在ViewGAN中, 多个生成器被同时训练, 旨在生成不同视角的图像. 此外, 本文提出了一种基于蒙特卡洛搜索的惩罚机制来促使每个生成器生成高质量的图像, 使得每个生成器更专注于指定视角图像的生成. 在DeepFashion, Dayton, ICG Lab6数据集上的大量实验证明: 我们的模型在Inception score和Top-k accuracy上的性能优于目前的主流模型, 并且在结构相似性(Structural similarity, SSIM)上的分数提升了32.29%, 峰值信噪比(Peak signal-to-noise ratio, PSNR)分数提升了14.32%, SD (Sharpness difference)分数提升了10.18%.
- 深度学习 /
- 计算机视觉 /
- 图像翻译 /
- 多视角图像生成
Abstract: Cross-view image translation aims at synthesizing new image from one to another. It is a fundamental issue in areas such as multi-view presentations and object modeling in virtual reality, which has been gaining a lot interest from researchers around the world. Recently, generative adversarial network (GAN) has shown promising results in image generation. However, the state-of-the-arts are limited to flxed flelds, and it is di–cult to migrate to other scenes, and the generated images are ambiguous and distorted. In this paper, we propose a novel framework- ViewGAN that makes it possible to generate realistic-looking images with difierent views. The ViewGAN can be flexibly migrated to multiple scenarios of the multi-view image generation task, which has multiple generators and one multi-class discriminator. The multiple generators are trained simultaneously, aiming at generating images from difierent views. Moreover, we propose a penalty mechanism based on Monte Carlo search to make each generator focus on generating its own images of a speciflc view accurately. Extensive experiments on DeepFashion, Dayton and ICG Lab6 datasets demonstrate that our model performs better on inception score and top-k accuracy than several state-of-the-arts, and the SSIM (structural similarity) increased by 32.29%, the PSNR (peak signal-to-noise ratio) increased by 14.32%, and the SD (sharpness difference) increased by 10.18%.
- Deep learning /
- computer vision /
- image translation /
- multi-view images generation
注释:

1) 收稿日期 2019-10-25 录用日期 2020-02-23 Manuscript received October 25, 2019; accepted February 23,2020 2020年安徽省自然科学基金联合基金(2008085UD08), 安徽省重点研发计划项目(201904d08020008, 202004a05020004), 合肥工业大学智能制造技术研究院智能网联及新能源汽车技术成果转化及产业化项目(IMIWL2019003, IMIDC2019002)资助 Supported by Joint Fund of Natural Science Foundation of Anhui Province in 2020 (2008085UD08), Anhui Provincial Key Research and Development Program (201904d08020008, 202004a05020004), and Intelligent Networking and New Energy Vehicle Special Project of Intelligent Manufacturing Institute of Hefei University of Technology (IMIWL2019003, IMIDC2019002) 本文责任编委吴建鑫 Recommended by Associate Editor WU Jian-Xin 1. 合肥工业大学计算机与信息学院合肥 230601

2) 1. School of Computer and Information, Hefei University of Technology, Hefei 230601

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图 1 本文模型ViewGAN在DeepFashion、Dayton和ICG Lab6数据集上的测试样例

Fig. 1 Examples of ViewGAN on three datasets, i.e., DeepFashion, Dayton and ICG Lab6

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图 2 ViewGAN模型的整体框架

Fig. 2 The framework of ViewGAN

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图 3 生成器$ \left(G_{j}\right) $的整体框架

Fig. 3 The framework of the generator $ G_j $

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图 4 各模型在DeepFashion数据集上的测试样例

Fig. 4 Results generated by different models on DeepFashion dataset

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图 5 各模型在Dayton数据集上的测试样例

Fig. 5 Results generated by different models on Dayton dataset

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图 6 各模型在ICG Lab6数据集上的测试样例

Fig. 6 Results generated by different models on ICG Lab6 dataset

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图 7 ViewGAN生成图像的可视化过程((a)输入图像; (b)粗粒度模块合成的低分辨率目标图像;(c)蒙特卡洛搜索的结果; (d)细粒度模块合成的高分辨率目标图像)

Fig. 7 Visualization of the process of ViewGAN generating images ((a) The input image; (b) The LR image generated by coarse image module; (c) Intermediate results generated by Monte Carlo search module; (d) The HR image generated by fine image module)

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表 1 生成器网络结构

Table 1 Generator network architecture

网络	层次	输入	输出
Down-Sample	CONV(N64, K4×4, S1, P3)-BN-Leaky Relu	(256, 256, 3)	(256, 256, 64)
	CONV(N128, K4×4, S2, P1)-BN-Leaky Relu	(256, 256, 64)	(128, 128, 128)
	CONV(N256, K4×4, S2, P1)-BN-Leaky Relu	(128, 128, 128)	(64, 64, 256)
	CONV(N512, K4×4, S2, P1)-BN-Leaky Relu	(64, 64, 256)	(32, 32, 512)
Residual Block	CONV(N512, K4×4, S1, P1)-BN-Leaky Relu	(32, 32, 512)	(32, 32, 512)
	CONV(N512, K4×4, S1, P1)-BN-Leaky Relu	(32, 32, 512)	(32, 32, 512)
	CONV(N512, K4×4, S1, P1)-BN-Leaky Relu	(32, 32, 512)	(32, 32, 512)
	CONV(N512, K4×4, S1, P1)-BN-Leaky Relu	(32, 32, 512)	(32, 32, 512)
	CONV(N512, K4×4, S1, P1)-BN-Leaky Relu	(32, 32, 512)	(32, 32, 512)
Up-Sample	DECONV(N256, K4×4, S2, P1)-BN-Leaky Relu	(32, 32, 512)	(64, 64, 256)
	DECONV(N128, K4×4, S2, P1)-BN-Leaky Relu	(64, 64, 256)	(128, 128, 128)
	DECONV(N64, K4×4, S1, P3)-BN-Leaky Relu	(128, 128, 128)	(256, 256, 64)
	CONV(N3, K4×4, S1, P3)-BN-Leaky Relu	(256, 256, 64)	(256, 256,3)

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表 2 判别器网络结构

Table 2 Discriminator network architecture

网络	层次	输入	输出
Input Layer	CONV(N64, K3×3, S1, P1)-Leaky Relu	(256, 256, 3)	(256, 256, 64)
	CONV BLOCK	(256, 256, 64)	(256, 256, 64)
	CONV BLOCK	(256, 256, 64)	(128, 128 128)
	CONV BLOCK	(128, 128 128)	(64, 64 256)
Inner Layer	HIDDEN LAYER	(64, 64 256)	(32, 32 512)
	HIDDEN LAYER	(32, 32 512)	(32, 32 64)
	DECONV BLOCK	(32, 32 64)	(64, 64 64)
	DECONV BLOCK	(64, 64 64)	(128, 128, 64)
	DECONV BLOCK	(128, 128, 64)	(256, 256, 64)
Output layer	CONV(N64, K3×3, S1, P1)-Leaky Relu	(256, 256, 64)	(256, 256, 3)
	CONV(N64, K3×3, S1, P1)-Leaky Relu
	CONV(N3, K3×3, S1, P1)-Tanh

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表 3 各模型Inception score统计表, 该指标越高表明模型性能越好

Table 3 Inception score of different models (For this metric, higher is better)

模型	DeepFashion			Dayton			ICG Lab6
模型	all classes	Top-1 class	Top-5 class	all classes	Top-1 class	Top-5 class	all classes	Top-1 class	Top-5 class
Pix2Pix	3.37	2.23	3.44	2.85	1.93	2.91	2.54	1.69	2.49
X-Fork	3.45	2.57	3.56	3.07	2.24	3.09	4.65	2.14	3.85
X-Seq	3.83	2.68	4.02	2.74	2.13	2.77	4.51	2.05	3.66
VariGAN	3.79	2.71	3.94	2.77	2.19	2.79	4.66	2.15	3.72
SelectionGAN	3.81	2.72	3.91	3.06	2.27	3.13	5.64	2.52	4.77
ViewGAN	4.10	2.95	4.32	3.18	2.27	3.36	5.92	2.71	4.91
Real Data	4.88	3.31	5.00	3.83	2.58	3.92	6.46	2.86	5.47

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表 4 各模型Top-k预测准确率统计表, 该指标越高表明模型性能越好

Table 4 Accuracies of different models (For this metric, higher is better)

模型	DeepFashion				Dayton				ICG Lab6
模型	Top-1 class		Top-5 class		Top-1 class		Top-5 class		Top-1 class		Top-5 class
Pix2Pix	7.34	9.28	25.79	32.68	6.80	9.15	23.55	27.00	1.33	1.62	5.43	6.79
X-Fork	20.68	31.35	50.45	64.12	30.00	48.68	61.57	78.84	5.94	10.36	20.83	30.45
X-Seq	16.03	24.31	42.97	54.52	30.16	49.85	62.59	80.70	4.87	8.94	17.13	24.47
VariGAN	25.67	31.43	55.52	63.70	32.21	52.69	67.95	84.31	10.44	20.49	33.45	41.62
SelectionGAN	41.57	64.55	72.30	88.65	42.11	68.12	77.74	92.89	28.35	54.67	62.91	76.44
ViewGAN	65.73	95.77	91.65	98.21	69.39	89.88	93.47	98.78	58.97	83.20	88.74	93.25

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表 5 各模型SSIM, PSNR, SD和速度统计表, 其中FPS表示测试时每秒处理的图像数量,所有指标得分越高表明模型性能越好

Table 5 SSIM, PSNR, SD of different models. FPS is the number of images processed per second during testing(For all metrics, higher is better)

模型	DeepFashion			Dayton			ICG Lab6			速度 (帧/s)
模型	SSIM	PSNR	SD	SSIM	PSNR	SD	SSIM	PSNR	SD	速度 (帧/s)
Pix2Pix	0.39	17.67	18.55	0.42	17.63	19.28	0.23	15.71	16.59	166±5
X-Fork	0.45	19.07	18.67	0.50	19.89	19.45	0.27	16.38	17.35	87±7
X-Seq	0.42	18.82	18.44	0.50	20.28	19.53	0.28	16.38	17.27	75±3
VariGAN	0.57	20.14	18.79	0.52	21.57	19.77	0.45	17.58	17.89	70±5
SelectionGAN	0.53	23.15	19.64	0.59	23.89	20.02	0.61	26.67	19.76	66±6
ViewGAN	0.70	26.47	21.63	0.74	25.97	21.37	0.80	28.61	21.77	62±2

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表 6 最小数据量实验结果

Table 6 Minimum training data experimental results

数据量 (幅)	SSIM	PSNR	SD
6000 (100%)	0.70	26.47	21.63
5400 (90%)	0.68	26.08	20.95
4800 (80%)	0.66	24.97	20.31
4200 (70%)	0.59	23.68	20.00
3600 (60%)	0.51	21.90	18.89

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表 7 消融分析实验结果

Table 7 Ablations study of the proposed ViewGAN

模型	结构	SSIM	PSNR	SD
A	Pix2Pix	0.46	19.66	18.89
B	A+由粗到精生成方法	0.53	22.90	19.31
C	B+混合生成对抗网络	0.60	23.77	20.03
D	C+类内损失	0.60	23.80	20.11
E	D+惩罚机制	0.70	26.47	21.63

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