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Crowd density estimation in still images using multiple local features and boosting regression ensemble

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Abstract

Crowd density estimation is a challenging research problem in computer vision and has many applications in commercial and defense sectors. Various crowd density estimation methods have been proposed by researchers in the past, but there is an utmost need for accurate, robust and efficient crowd density estimation techniques for its practical implementation. In this paper, we propose a fine-tuned and computationally economical, ensemble regression-based machine learning model for crowd density estimation. The WorldExpo’10 dataset has been used for experimental analysis and model performance evaluation. We extract variety of features in texture-based features such as gray-level co-occurrence matrix, local binary pattern and histogram of oriented gradients, structure-based features such as perimeter pixel and the orientation of pixels, and segment-based handcrafted features from each patch of the image and use an optimum combination of these features as input to the regression model. To achieve optimized memory utilization and faster speed, principal component analysis is employed to reduce the dimensions of the lengthy feature vector. Extensive experiments on different fronts ranging from the model hyperparameter optimization, features optimization and features selection were conducted, and at each step, we selected the most favorable results as input to the optimized model. The performance of the model is evaluated based on two popular metrics, i.e., mean absolute error and mean squared error. The comparative analysis shows that the proposed system outperforms the former methods tested on the WorldExpo’10 dataset.

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Authors and Affiliations

  1. WiSP Lab, Department of Electrical Engineering, Institute of Space Technology, Islamabad, 44000, Pakistan

    Muhammad Shahid Saleem, Muhammad Jaleed Khan & Khurram Khurshid

  2. Department of Electrical and Computer Engineering, King Abdulaziz University, Jeddah, 21589, Saudi Arabia

    Muhammad Shehzad Hanif

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  1. Muhammad Shahid Saleem
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  2. Muhammad Jaleed Khan
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Correspondence to Khurram Khurshid.

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Saleem, M.S., Khan, M.J., Khurshid, K. et al. Crowd density estimation in still images using multiple local features and boosting regression ensemble. Neural Comput & Applic 32, 16445–16454 (2020). https://doi.org/10.1007/s00521-019-04021-2

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