Visual Semantics Allow for Textual Reasoning Better in Scene Text Recognition

Existing Scene Text Recognition (STR) methods typically use a language model to optimize the joint probability of the 1D character sequence predicted by a visual recognition (VR) model, which ignore the 2D spatial context of visual semantics within and between character instances, making them not generalize well to arbitrary shape scene text. To address this issue, we make the first attempt to perform textual reasoning based on visual semantics in this paper. Technically, given the character segmentation maps predicted by a VR model, we construct a subgraph for each instance, where nodes represent the pixels in it and edges are added between nodes based on their spatial similarity. Then, these subgraphs are sequentially connected by their root nodes and merged into a complete graph. Based on this graph, we devise a graph convolutional network for textual reasoning (GTR) by supervising it with a cross-entropy loss. GTR can be easily plugged in representative STR models to improve their performance owing to better textual reasoning. Specifically, we construct our model, namely S-GTR, by paralleling GTR to the language model in a segmentation-based STR baseline, which can effectively exploit the visual-linguistic complementarity via mutual learning. S-GTR sets new state-of-the-art on six challenging STR benchmarks and generalizes well to multi-linguistic datasets. Code is available at https://github.com/adeline-cs/GTR.

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Datasets


Results from the Paper


 Ranked #1 on Scene Text Recognition on SVT (using extra training data)

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Task Dataset Model Metric Name Metric Value Global Rank Uses Extra
Training Data
Result Benchmark
Scene Text Recognition CUTE80 S-GTR Accuracy 94.7 # 1
Scene Text Recognition ICDAR2013 S-GTR Accuracy 97.8 # 1
Scene Text Recognition ICDAR2015 S-GTR Accuracy 87.3 # 1
Scene Text Recognition IIIT5k S-GTR Accuracy 97.5 # 1
Scene Text Recognition SVT S-GTR Accuracy 95.8 # 1
Scene Text Recognition SVTP S-GTR Accuracy 90.6 # 1

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