Bi-directional Feature Fusion for Fast and Accurate Text Detection of Arbitrary Shapes
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摘要: 现有的基于分割的场景文本检测方法仍较难区分相邻文本区域，同时网络得到分割图后后处理阶段步骤复杂导致模型检测效率较低。为了解决此问题，该文提出一种新颖的基于全卷积网络的场景文本检测模型。首先，该文构造特征提取器对输入图像提取多尺度特征图。其次，使用双向特征融合模块融合两个平行分支特征的语义信息并促进两个分支共同优化。之后，该文通过并行地预测缩小的文本区域图和完整的文本区域图来有效地区分相邻文本。其中前者可以保证不同的文本实例之间具有区分性，而后者能有效地指导网络优化。最后，为了提升文本检测的速度，该文提出一个快速且有效的后处理算法来生成文本边界框。实验结果表明：在相关数据集上，该文所提出的方法均实现了最好的效果，且比目前最好的方法在F-measure指标上最多提升了1.0%，并且可以实现将近实时的速度，充分证明了该方法的有效性和高效性。Abstract: Existing segmentation based methods have problems, such as the difficulty in distinguishing adjacent text areas and the low efficiency of model detection caused by the complex steps in the post-processing stage. In order to solve this problem, this article proposes a novel scene text detection model based on fully convolutional network, which can solve the problem that adjacent texts are difficult to distinguish in existing methods and improve the detection speed of the model. First, it constructs a feature extractor to extract multi-scale feature map from the input image. Secondly, the bidirectional feature fusion module is used to fuse the semantic information of the two parallel branches and promote the joint optimization of the two branches. It then effectively differentiates adjacent texts by predicting both a reduced text area map and a full text area map in parallel. The former can guarantee the distinction between different text instances, while the latter can effectively guide the network optimization. Finally, in order to improve the speed of text detection, it proposes a fast and effective post-processing algorithm to generate text boundary boxes. The experimental results show that: on relative datasets, the method proposed in this article achieves the best performance, and improves the F-measure index by 1.0% at most compared with the current best method, and can achieve near-real-time speed, which proves fully the effectiveness and high efficiency of the method.
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表 1 双向特征融合模块及整体文本框分支在不同基础网络下的性能增益及检测效率
基础网络 双向特征
融合模块整体文本区
域预测分支评价指标(%) FPS 准确率 召回率 F综合指标 ResNet-50 × × 87.4 82.7 85.0 17.4 ResNet-50 × √ 87.8 83.1 85.4 16.8 ResNet-50 √ √ 88.0 83.5 85.7 16.0 ResNet-18 × × 86.6 79.8 83.1 31.0 ResNet-18 × √ 85.9 80.8 83.3 30.5 ResNet-18 √ √ 86.5 81.2 83.8 29.6 
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