Bi-direction Context Propagation Network for Real-time Semantic Segmentation
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Spatial details and context correlations are two types of critical information for semantic segmentation. Generally, spatial details are most likely existed in shallow layers, but context correlations are most likely existed in deep layers. Aiming to use both of them, most of current methods choose forward transmitting the spatial details to deep layers. We find spatial details transmission is computationally expensives, and substantially lowers the model's execution speed. To address this problem, we propose a new Bi-direction Contexts Propagation Network (BCPNet), which performs semantic segmentation in real-time. Different from the previous methods, our BCPNet effectively back propagate the context information to the shallow layers, which is more computationally modesty. Extensive experiments validate that our BCPNet has achieved a good balance between accuracy and speed. For accuracy, our BCPNet has achieved 68.4 % IoU on the Cityscapes test set and 67.8 the CamVid test set. For speed, our BCPNet can achieve 585.9 FPS and 1.7 ms runtime per an image.
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