Parallel Complement Network for Real-Time Semantic Segmentation of Road Scenes

Qingxuan Lv, Xin Sun, Changrui Chen, Junyu Dong, Huiyu Zhou

Research output: Contribution to journalArticlepeer-review


Real-time semantic segmentation is in intense demand for the application of autonomous driving. Most of the semantic segmentation models tend to use large feature maps and complex structures to enhance the representation power for high accuracy. However, these inefficient designs increase the amount of computational costs, which hinders the model to be applied on autonomous driving. In this paper, we propose a lightweight real-time segmentation model, named Parallel Complement Network (PCNet), to address the challenging task with fewer parameters. A Parallel Complement layer is introduced to generate complementary features with a large receptive field. It provides the ability to overcome the problem of similar feature encoding among different classes, and further produces discriminative representations. With the inverted residual structure, we design a Parallel Complement block to construct the proposed PCNet. Extensive experiments are carried out on challenging road scene datasets, i.e., CityScapes and CamVid, to make comparison against several state-of-the-art real-time segmentation models. The results show that our model has promising performance. Specifically, PCNet* achieves 72.9% Mean IoU on CityScapes using only 1.5M parameters and reaches 79.1 FPS with 1024x 2048 resolution images on GTX 2080Ti. Moreover, our proposed system achieves the best accuracy when being trained from scratch.

Original languageEnglish
JournalIEEE Transactions on Intelligent Transportation Systems
Early online date02 Feb 2021
Publication statusEarly online date - 02 Feb 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:

Copyright 2021 Elsevier B.V., All rights reserved.


  • Computational efficiency
  • Computational modeling
  • deep convolutional neural networks.
  • Feature extraction
  • Image segmentation
  • real-time semantic segmentation
  • Real-time systems
  • Road scene understanding
  • Semantics
  • Task analysis

ASJC Scopus subject areas

  • Automotive Engineering
  • Mechanical Engineering
  • Computer Science Applications


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