基于子空间多尺度特征融合的试卷语义分割

夏源祥; 刘渝; 楚程钱; 万永菁; 蒋翠玲

doi:10.14135/j.cnki.1006-3080.20220117001

基于子空间多尺度特征融合的试卷语义分割

doi: 10.14135/j.cnki.1006-3080.20220117001

华东理工大学信息科学与工程学院, 上海 200237

基金项目: 国家自然科学基金（61872143）

详细信息

作者简介:
夏源祥（1995—），男，贵州黔西人，硕士研究生，主要研究方向：图像分割、深度学习。E-mail：yxxia@ecust.edu.cn

通讯作者:
万永菁， E-mail：wanyongjing@ecust.edu.cn

中图分类号: TP391.4
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- 文章访问数: 42
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- PDF下载量: 8
- 被引次数: 0
出版历程
- 收稿日期: 2022-01-17
- 网络出版日期: 2022-04-27

Semantic segmentation of test papers based on subspace multi-scale feature fusion

School of information Science and Engineering, East China University of Science and Technology, Shanghai 200237, China

摘要

摘要: 分离印刷体和手写体区域是实现试卷语义分割的关键步骤，为了提升试卷语义分割的效果，提出一种基于MaskRCNN网络的注意力改进算法。该算法将子空间多尺度特征融合(Subspace Multiscale Feature Fusion, SMFF)模块嵌入MaskRCNN网络的特征金字塔结构中，SMFF模块基于子空间计算注意力特征，减少特征图中的空间和通道冗余；通过多尺度特征融合，有效提取不同大小文本区域的特征并增强特征间的关联性。实验结果表明，在试卷图像数据集的目标检测和语义分割任务上，基于SMFF模块的MaskRCNN网络模型比MaskRCNN原网络模型的平均准确率提高了15.8%和10.2%，比基于常用注意力模块的MaskRCNN网络也有较大的性能提升。
- 印刷体和手写体分割 /
- 特征金字塔 /
- 注意力模块 /
- 子空间 /
- 特征融合
Abstract: An improved attention algorithm based on the MaskRCNN network to improve the effect of the semantic segmentation of the test paper, because separating the printed and handwritten regions is a key step to achieve the semantic segmentation of the test paper. The algorithm embeds the Subspace Multiscale Feature Fusion (SMFF) module into the feature pyramid structure of the MaskRCNN network, which calculates attention features based on the subspace, and reduces the spatial and channel redundancy in the feature map. Fusion can effectively extract features of text regions of different sizes and enhance the correlation between features. The experimental results show that the average accuracy of the MaskRCNN network model based on the SMFF module is 15.8% and 10.2% higher than that of the original MaskRCNN network model in the target detection and semantic segmentation tasks of the test paper image dataset, which has a large performance improvement than the MaskRCNN based on the commonly used attention module.
- Handwritten and printed classification /
- Feature Pyramid Network /
- attention module /
- subspace /
- feature fusion

HTML全文

图 1 基于SMFF的试卷语义分割算法

Figure 1. Algorithm for Semantic Segmentation of Exercises Based on SMFF

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图 2 SMFF模块示意图

Figure 2. Subsapce Multiscale Feature Fusion Module

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图 3 SAM示意图

Figure 3. Subspace Attention Module

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图 4 多尺度卷积核示意图

Figure 4. Multiscale Convolution Kernel

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图 5 UM与SMFF的分组对比

Figure 5. Grouping comparison of UM and SMFF

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图 6 实验结果对比图

Figure 6. Comparison of experimental results

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图 7 算法效果对比图

Figure 7. Comparison of algorithm effects

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图 8 实验效果展示

Figure 8. Present of experimental results

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表 1 注意力模型的效果对比

Table 1. Comparison of the effect of attention model

Method	reg/%					seg/%					Time （sec）
Method	AP	AP⁵⁰	AP⁷⁵	AP_m	AP_l	AP	AP⁵⁰	AP⁷⁵	AP_m	AP_l	Time （sec）
MR	57.9	89.8	66.4	40.7	55.0	49.4	90.6	41.1	44.4	46.7	6.654
MR-CC	65.6	93.9	77.7	45.9	64.4	53.3	93.8	46.9	47.3	51.4	6.765
MR-SE	67.6	94.9	79.6	48.4	66.4	55.8	96.1	53.0	56.4	53.8	6.656
MR-sc	68.2	95.7	82.1	47.8	67.9	55.4	96.5	49.5	49.1	53.8	6.656
MR-ECA	68.8	96.4	82.6	48.1	68.9	56.2	96.7	52.0	52.0	55.1	6.655
MR-UM	70.3	96.2	85.2	54.7	70.0	56.5	96.1	52.8	55.6	55.0	9.588
SMFF	73.7	97.5	89.0	55.2	74.7	59.6	97.8	61.3	54.9	58.9	8.709

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表 2 特征融合模型效果对比

Table 2. Comparison of the effects of feature fusion model

Method	reg/%					seg/%					Time（sec）
Method	AP	AP⁵⁰	AP⁷⁵	AP_m	AP_l	AP	AP⁵⁰	AP⁷⁵	AP_m	AP_l	Time（sec）
MR	57.9	89.8	66.4	40.7	55.0	49.4	90.6	41.1	44.4	46.7	6.654
MR-DW	59.4	89.6	70.2	42.2	57.3	49.8	90.9	42.1	43.1	47.5	8.042
MR-Mix	65.0	93.8	78.5	44.8	63.7	52.4	94.0	44.7	46.6	49.7	7.857
MR-PS	64.6	93.1	77.0	44.2	63.3	53.5	93.3	47.3	47.1	51.0	8.118
SMFF	73.7	97.5	89.0	55.2	74.7	59.6	97.8	61.3	54.9	58.9	8.709

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表 3 SMFF模块的消融实验

Table 3. Ablation experiment of SFM module

Back-Bone	Sub-space	Feature-fusion	reg/%					seg/%					Time （sec）
Back-Bone	Sub-space	Feature-fusion	AP	AP⁵⁰	AP⁷⁵	APm	AP_l	AP	AP⁵⁰	AP⁷⁵	APm	AP_l	Time （sec）
MR			57.9	89.8	66.4	40.7	55.0	49.4	90.6	41.1	44.4	46.7	6.654
	√		70.0	95.8	84.5	52.8	70.9	56.4	96.5	54.3	58.1	55.7	7.619
	√	√	73.7	97.5	89.0	55.2	74.7	59.6	97.8	61.3	54.9	58.9	8.709

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表 4 印刷体和手写体分类算法处理时间对比

Table 4. Comparison of processing time between printed and handwritten classification algorithms

Method	Time （sec）
Literature [5]	3.258
Literature [6]	9.228
Literature [7]	9.313
Literature [8]	9.156
Ours	8.709

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