A 92mW real-time traffic sign recognition system with robust light and dark adaptation

Abstract

A traffic sign recognition system that is robust under various lighting condition is proposed with an image enhancement preprocessor and a recognition processor. The image enhancement preprocessor performs the Multi-scale Retinex (MSR) algorithm for robust light and dark adaptation. It includes a mixed-mode Adaptive Neuro-Fuzzy Inference System (ANFIS) engine that performs online optimizations for various scenes. The recognition processor performs the Support Vector Machine (SVM) algorithm for robust sign recognition. Its proposed algorithm-optimized kernel cache and memory architecture reduces the power consumption and memory redundancy by 78% and 35%, respectively. The proposed system is implemented in a 0.13μm CMOS process and is connected using Network-on-Chip (NoC) communication. As a result, the system achieves robust sign recognition under various lighting conditions while consuming just 92mW at 1.2V.

Hardware/Software Co-Design of a Traffic Sign Recognition System Using Zynq FPGAs

“…These include conventional (general purpose) computers [20], custom ASIC (application-specific integrated circuit) chips [21], field programmable gate arrays (FPGAs) [22][23][24][25], digital signal processors (DSPs) [26] and also graphic processing units [27]. Although it is difficult to make a direct comparison due to differences in the TSR algorithms employed, the following section discusses the motivation and outcomes of these hardware architectures with respect to the proposed hardware/software solution.…”

“…However, their traffic sign set is limited to only 20 signs, and the PC platform is not an embedded system that can be integrated into a car. In [21], a low power 0.13-μm ASIC chip has been presented for traffic sign detection, incorporating an image enhancement preprocessor and a sign recognition preprocessor. The image enhancement preprocessor uses the MSR (multi-scale retinex) algorithm, providing a robust image, adaptable to light and dark conditions.…”