Abstract
Counting of passengers entering and exiting means of transport is one of the basic functionalities of passenger flow monitoring systems. Exact numbers of passengers are important in areas such as public transport surveillance, passenger flow prediction, transport planning, and transport vehicle load monitoring. To allow mass utilization of passenger flow monitoring systems, their cost must be low. As the overall price is mainly given by prices of the used sensor and processing unit, we propose the utilization of a visible spectrum camera and data processing algorithms of low time complexity to ensure a low price of the final product. To guarantee the anonymity of passengers, we suggest orthogonal scanning of a scene. As the precision of the counting is relevantly influenced by the precision of passenger recognition, we focus on the development of an appropriate recognition method. We present two opposite approaches which can be used for the passenger recognition in means of transport with and without entrance steps, or with split level flooring. The first approach is the utilization of an appropriate convolutional neural network (ConvNet), which is currently the prevailing approach in computer vision. The second approach is the utilization of histograms of oriented gradients (HOG) features in combination with a support vector machine classifier. This approach is a representative of classical methods. We study both approaches in terms of practical applications, where real-time processing of data is one of the basic assumptions. Specifically, we examine classification performance and time complexity of the approaches for various topologies and settings, respectively. For this purpose, we form and make publicly available a large-scale, class-balanced dataset of labelled RGB images. We demonstrate that, compared to ConvNets, the HOG-based passenger recognition is more suitable for practical applications. For an appropriate setting, it defeats the ConvNets in terms of time complexity while keeping excellent classification performance. To allow verification of theoretical findings, we construct an engineering prototype of the system.
Highlights
In passenger transport, person flow monitoring has an indispensable importance
We propose a competitive approach which is based on histograms of oriented gradients (HOG) features [26] and on a support vector machine (SVM) classifier
We study the classification performances and time complexities of passenger recognition systems. e systems are aimed at recognition of passengers in orthogonally captured images, where the recognition quality is not adversely affected by the variable distance between the passenger and camera sensor. e passenger recognition systems are based either on convolutional neural network (ConvNet) or on HOG features
Summary
Person flow monitoring has an indispensable importance. In some areas of public transport, passenger flow monitoring systems are employed to automate this task. A precise counting of passengers entering and exiting means of transport has a positive effect on public transport surveillance, passenger flow prediction, transport planning, transport vehicle load monitoring, station control and management, and cost optimization [1, 2]. To ensure a robust and precise counting of passengers in real time, a passenger flow monitoring system must be based on an appropriate imaging system and data processing algorithms. In order to allow a mass deployment of such a monitoring system, a low-cost final solution is important. E solution should meet legal requirements where passenger anonymity is of great importance. Identification of individuals according to their faces must be avoided
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