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Speed-limit Sign Recognition Using Convolutional Neural Network Based on Random Forest

랜덤 포레스트 분류기 기반의 컨벌루션 뉴럴 네트워크를 이용한 속도제한 표지판 인식

  • Received : 2015.09.12
  • Accepted : 2015.11.04
  • Published : 2015.11.30

Abstract

In this paper, we propose a robust speed-limit sign recognition system which is durable to any sign changes caused by exterior damage or color contrast due to light direction. For recognition of speed-limit sign, we apply CNN which is showing an outstanding performance in pattern recognition field. However, original CNN uses multiple hidden layers to extract features and uses fully-connected method with MLP(Multi-layer perceptron) on the result. Therefore, the major demerit of conventional CNN is to require a long time for training and testing. In this paper, we apply randomly-connected classifier instead of fully-connected classifier by combining random forest with output of 2 layers of CNN. We prove that the recognition results of CNN with random forest show best performance than recognition results of CNN with SVM (Support Vector Machine) or MLP classifier when we use eight speed-limit signs of GTSRB (German Traffic Sign Recognition Benchmark).

Keywords

Convolutional Neural Network;Random forest;speed-limit sign recognition;feature extraction;ADAS

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