Abstract
In recent years, urgent needs for counting crowds and vehicles have greatly promoted research of crowd counting and density estimation. Benefiting from the rapid development of deep learning, the counting performance has been greatly improved, and the application scenarios have been further expanded. Aiming to deeply understand the development status of crowd counting and density estimation, we introduce and analyze the typical methods in this field and especially focus on elaborating deep learning-based counting methods. We summarize the existing approaches into four categories, i.e., detection-based, regression-based, convolutional neural network based and video-based. Each category is explicated in great detail. To provide more concrete reference, we compare the performance of typical methods on the popular benchmarks. We further elaborate on the datasets and metrics for the crowd counting community and discuss the work of solving the problem of small-sample-based counting, dataset annotation methods and so on. Finally, we summarize various challenges facing crowd counting and their corresponding solutions and propose a set of development trends in the future.
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References
Ryan D, Denman S, Fookes C et al (2009) Crowd counting using multiple local features. In: 2009 Digital image computing: techniques and applications. IEEE, pp 81–88
Subburaman VB, Descamps A, Carincotte C (2012) Counting people in the crowd using a generic head detector. In: 2012 IEEE ninth international conference on advanced video and signal-based surveillance
Hou Y, Pang G (2011) People counting and human detection in a challenging situation. IEEE Trans Syst Man Cybern Part A 41(1):24–33
Handte M, Iqbal MU, Wagner S et al (2014) Crowd density estimation for public transport vehicles. EDBT/ICDT Workshops
Hussain N, Yatim HSM, Hussain NL et al (2011) Cdes: a pixel-based crowd density estimation system for masjid al-haram. Saf Sci 49(6):824–833
Yuan Y, Qiu C, Xi W et al (2011) Crowd density estimation using wireless sensor networks. In: 2011 Seventh international conference on mobile ad-hoc and sensor networks, 138–145
Zhe W, Hong L, Qian Y et al (2012) Crowd density estimation based on local binary pattern co-occurrence matrix. 2012 IEEE International Conference on Multimedia and Expo Workshops, 372–377.
Cho SY, Chow TWS, Leung CT (1999) A neural-based crowd estimation by hybrid global learning algorithm. IEEE Trans Syst Man Cybern B Cybern 29(4):535–541
Marana AN, Velastin SA, Costa LF et al (1998) Automatic estimation of crowd density using texture. Saf Sci 28(3):165–175
Ma R, Li L, Huang W et al (2004) On pixel count based crowd density estimation for visual surveillance. IEEE Conf Cybern Intell Syst 1:170–173
Chan AB, Liang Z-SJ, Vasconcelos N (2008) Privacy preserving crowd monitoring: counting people without people models or tracking. IEEE Conf Comput Vis Pattern Recognit 2008:1–7
Ke C, Chen CL, Gong S et al (2012) Feature mining for localised crowd counting. In: British machine vision conference
Idrees H, Saleemi I, Seibert C et al (2013) Multi-source multi-scale counting in extremely dense crowd images. In: IEEE conference on computer vision and pattern recognition
Cong Z, Li H, Wang X et al (2015) Cross-scene crowd counting via deep convolutional neural networks. In: 2015 IEEE conference on computer vision and pattern recognition (CVPR)
Zhang Y-Y, Zhou D, Chen S et al (2016) Single-image crowd counting via multi-column convolutional neural network. IEEE Conf Comput Vis Pattern Recognit 2016:589–597
Idrees H, Tayyab M, Athrey K et al (2018) Composition loss for counting, density map estimation and localization in dense crowds. In: ECCV
Wang Q, Gao J, Lin W et al (2019) Learning from synthetic data for crowd counting in the wild. IEEE CVF Conf Comput Vis Pattern Recognit 2019:8190–8199
Liu X, Weijer JVD, Bagdanov AD (2018) Leveraging unlabeled data for crowd counting by learning to rank. In: 2018 IEEE/CVF conference on computer vision and pattern recognition (CVPR)
Sam DB, Sajjan NN, Maurya H et al (2019) Almost unsupervised learning for dense crowd counting. In: AAAI
Lu E, Xie W, Zisserman A (2018) Class-agnostic counting. In: ACCV
Liu X, van de Weijer J, Bagdanov AD (2019) Exploiting unlabeled data in cnns by self-supervised learning to rank. IEEE Trans Pattern Anal Mach Intell 41:1862–1878
Zhan B, Monekosso D, Remagnino P et al (2008) Crowd analysis: a survey. Mach Vis Appl 19:345–357
Loy CC, Chen K, Gong S et al. (2013) Crowd counting and profiling: methodology and evaluation. In: Modeling, simulation and visual analysis of crowds
Ryan D, Denman S, Sridharan S et al (2015) An evaluation of crowd counting methods, features and regression models. Comput Vis Image Underst 130:1–17
Zitouni MS, Bhaskar H, Dias J et al (2016) Advances and trends in visual crowd analysis: a systematic survey and evaluation of crowd modelling techniques. Neurocomputing 186:139–159
Saleh SMA, Suandi SA, Ibrahim H (2015) Recent survey on crowd density estimation and counting for visual surveillance. Eng Appl Artif Intell 41:103–114
Sindagi V, Patel V (2018) A survey of recent advances in cnn-based single image crowd counting and density estimation. abs/1707.01202
Ilyas N, Shahzad A, Kim K (2020) Convolutional-neural network-based image crowd counting: review, categorization, analysis, and performance evaluation. Sensors (Basel, Switzerland), 20(1)
Nguyen VTT, Ngo TD (2019) Single-image crowd counting: a comparative survey on deep learning-based approaches. Int J Multimed Inf Retr 9:63–80
Cenggoro TW (2019) Deep learning for crowd counting: a survey. EMACS, 1(1)
Abdou M, Erradi A (2020) Crowd counting: a survey of machine learning approaches. In: 2020 IEEE international conference on informatics, IoT, and enabling technologies (ICIoT). pp 48–54
Luo Y, Lu J, Zhang B (2020) Crowd counting for static images: a survey of methodology. In: 2020 39th Chinese control conference (CCC). pp 6602–6607
Jeevitha S, Rajeswari R(2019) A Review of Crowd Counting Techniques. Internat J Res Anal Rev 5(3)
Gao G, Gao J, Liu Q et al (2020) Cnn-based density estimation and crowd counting: a survey. abs/2003.12783)
Rabichith SPK, Nithya S, Borra S (2018) Crowd density estimation using image processing: a survey. Int J Appl Eng Res 13(9): 6855–6864
Lempitsky VS, Zisserman A (2010) Learning to count objects in images. In: NIPS
Pham VQ, Kozakaya T, Yamaguchi O et al (2015) Count forest: co-voting uncertain number of targets using random forest for crowd density estimation. In: International conference on computer vision (ICCV 2015)
Boominathan L, Kruthiventi SSS, Babu RV (2016) Crowdnet: a deep convolutional network for dense crowd counting. In: Proceedings of the 24th ACM international conference on multimedia
Ooro-Rubio D, Lpez-Sastre RJ (2016) Towards perspective-free object counting with deep learning. ECCV
Zeng L, Xu X, Cai B et al (2017) Multi-scale convolutional neural networks for crowd counting. IEEE International Conference on Image Processing (ICIP), 465-469
Sindagi VA, Patel VM (2017) Generating high-quality crowd density maps using contextual pyramid cnns. In: IEEE international conference on computer vision
Sam DB, Surya S, Babu RV (2017) Switching convolutional neural network for crowd counting. In: 2017 IEEE conference on computer vision and pattern recognition (CVPR)
Zhang L, Shi M, Chen Q (2017) Crowd counting via scale-adaptive convolutional neural network. IEEE Winter Conf Appl Comput Vis (WACV) 2018:1113–1121
Li Y, Zhang X, Chen D (2018) Csrnet: dilated convolutional neural networks for understanding the highly congested scenes. IEEE CVF Conf Comput Vis Pattern Recognit 2018:1091–1100
Liu L, Wang H, Li G et al (2018) Crowd counting using deep recurrent spatial-aware network. In: IJCAI
Ranjan V, Le H, Hoai M (2018) Iterative crowd counting. In: ECCV
Cao X, Wang Z, Zhao Y et al (2018) Scale aggregation network for accurate and efficient crowd counting. In: Proceedings of the European conference on computer vision (ECCV), pp 734–750
Wu X, Zheng Y, Ye H et al (2019) Adaptive scenario discovery for crowd counting. In: ICASSP 2019–2019 IEEE international conference on acoustics, speech and signal processing (ICASSP). pp 2382–2386
Liu J, Gao C, Meng D et al (2017) Decidenet: counting varying density crowds through attention guided detection and density estimation. IEEE CVF Conf Comput Vis Pattern Recognit 2018:5197–5206
Liu N, Long Y, Zou C et al (2018) Adcrowdnet: an attention-injective deformable convolutional network for crowd understanding. IEEE CVF Conf Comput Vis Pattern Recognit 2019:3220–3229
Dong L, Zhang H, Ji Y et al (2020) Crowd counting by using multi-level density-based spatial information: a multi-scale cnn framework. Inf Sci 528:79–91
Hu Y, Jiang X, Liu X et al (2020) Nas-count: counting-by-density with neural architecture search. arXiv:2003.00217
Liu L, Lu H, Zou H et al (2020) Weighing counts: sequential crowd counting by reinforcement learning. arXiv:2007.08260
Jiang X, Zhang L, Xu M et al (2020) Attention scaling for crowd counting. IEEE CVF Conf Comput Vis Pattern Recognit 2020:4705–4714
Bai S, He Z, Qiao Y et al (2020) Adaptive dilated network with self-correction supervision for counting. IEEE CVF Conf Comput Vis Pattern Recognit 2020:4593–4602
Liu X, Yang J, Ding W (2020) Adaptive mixture regression network with local counting map for crowd counting. arXiv:2005.05776
Wu B, Nevatia R (2005) Detection of multiple, partially occluded humans in a single image by Bayesian combination of edgelet part detectors. In: Tenth IEEE international conference on computer vision, 2005. ICCV 2005
Sabzmeydani P, Mori G (2007) Detecting pedestrians by learning shapelet features. In: 2007 IEEE computer society conference on computer vision and pattern recognition (CVPR 2007), 18–23 June 2007. Minneapolis, Minnesota, USA
Dalal N, Triggs B (2005) Histograms of oriented gradients for human detection. In: 2005 IEEE computer society conference on computer vision and pattern recognition (CVPR’05), vol 1. pp 886–893
Viola P, Jones MJ (2004) Robust real-time face detection. Int J Comput Vis 57(2):137–154
Gao C, Liu J, Feng Q et al (2016) People-flow counting in complex environments by combining depth and color information. Multimed Tools Appl 75(15):9315–9331
Viola PA, Jones MJ, Snow D (2003) Detecting pedestrians using patterns of motion and appearance. In: Proceedings ninth IEEE international conference on computer vision, vol 2. pp 734–741
Gall J, Member IEEE et al (2011) Hough forests for object detection, tracking, and action recognition. IEEE Trans Pattern Anal Mach Intell 33(11):2188–2202
Min L, Zhang Z, Huang K et al (2008) Estimating the number of people in crowded scenes by mid based foreground segmentation and head-shoulder detection, in 19th International Conference on Pattern Recognition (ICPR 2008), December 8–11, 2008. Tampa, Florida
Wu B, Nevatia R (2007) Detection and tracking of multiple, partially occluded humans by Bayesian combination of edgelet based part detectors. Int J Comput Vis 75(2):247–266
Lin S, Chen J, Chao H (2001) Estimation of number of people in crowded scenes using perspective transformation. IEEE Trans Syst Man Cybern Part A Syst Hum 31(6):645–654
Felzenszwalb PF, Girshick RB, Mcallester D et al (2010) Object detection with discriminatively trained part-based models. IEEE Trans Pattern Anal Mach Intell 32(9):1627–1645
Laradji IH, Rostamzadeh N, Pinheiro PHO et al (2018) Where are the blobs: counting by localization with point supervision. In: ECCV
Liu Y, Shi M, Zhao Q et al (2019) Point in, box out: beyond counting persons in crowds. IEEE CVF Conf Comput Vis Pattern Recognit 2019:6462–6471
Kong D, Gray D, Tao H (2006) A viewpoint invariant approach for crowd counting. In: 18th international conference on pattern recognition (ICPR 2006), 20–24 August 2006. China, Hong Kong
Chan AB, Vasconcelos N (2009) Bayesian poisson regression for crowd counting. In: 2009 IEEE 12th international conference on computer vision
Chen K, Gong S, Xiang T et al (2013) Cumulative attribute space for age and crowd density estimation. In: IEEE conference on computer vision and pattern recognition
Rodriguez M, Laptev I, Sivic J et al (2011) Density-aware person detection and tracking in crowds. In: IEEE international conference on computer vision, ICCV 2011, Barcelona, Spain, November 6–13, 2011
KONG D (2005) Counting pedestrians in crowds using viewpoint invariant training. In: British machine vision conference
Li J, Huang L, Liu C (2011) Robust people counting in video surveillance: dataset and system. In: 2011 8th IEEE international conference on advanced video and signal based surveillance (AVSS). pp 54–59
Phu D, Julien C, Brmond BF et al (2013) Author manuscript, published in “ieee international conference on advanced video and signal-based surveillance (2013)” online tracking parameter adaptation based on evaluation
Lin T-Y, Lin Y-Y, Weng M-F et al (2011) Cross camera people counting with perspective estimation and occlusion handling. IEEE Int Workshop Inf Forensics Secur 2011:1–6
Min F, Pei X, Li X et al (2015) Fast crowd density estimation with convolutional neural networks. Eng Appl Artif Intell 43:81–88
Jiang X, Xiao Z, Zhang B et al (2019) Crowd counting and density estimation by trellis encoder–decoder networks. IEEE CVF Conf Comput Vis Pattern Recognit 2019:6126–6135
Varior RR, Shuai B, Tighe J et al (2019) Multi-scale attention network for crowd counting. CVPR
Gao J, Wang Q, Yuan Y (2019) Scar: spatial-/channel-wise attention regression networks for crowd counting. Neurocomputing 363:1–8
Zhu L, Zhao Z, Lu C et al (2019) Dual path multi-scale fusion networks with attention for crowd counting. arXiv:1902.01115
Zou Z, Cheng Y, Qu X et al (2019) Attend to count: crowd counting with adaptive capacity multi-scale cnns. Neurocomputing 367:75–83
Sam DB, Sajjan NN, Babu RV (2018) Divide and grow: capturing huge diversity in crowd images with incrementally growing cnn. IEEE CVF Conf Comput Vis Pattern Recognit 2018:3618–3626
Shen Z, Xu Y, Ni B et al (2018) Crowd counting via adversarial cross-scale consistency pursuit. IEEE CVF Conf Comput Vis Pattern Recognit 2018:5245–5254
Yang J, Zhou Y, Kung S-Y (2018) Multi-scale generative adversarial networks for crowd counting. In: 2018 24th international conference on pattern recognition (ICPR)
Wang L, Li Y, Xue X (2019) Coda: counting objects via scale-aware adversarial density adaption. IEEE Int Conf Multimed Expo (ICME) 2019:193–198
Liu W, Salzmann M, Fua P (2018) Context-aware crowd counting. IEEE CVF Conf Comput Vis Pattern Recognit CVPR 2019:5094–5103
Sang J, Wu W, Luo H et al (2019) Improved crowd counting method based on scale-adaptive convolutional neural network. IEEE Access 7:24411–24419
Zou Z, Su X, Qu X et al (2018) Da-net: learning the fine-grained density distribution with deformation aggregation network. IEEE Access 6:60745–60756
Szegedy C, Liu W, Jia Y et al (2015) Going deeper with convolutions. IEEE Conf Comput Vis Pattern Recognit CVPR 2015:1–9
Chen Z, Cheng J, Yuan Y et al (2019) Deep density-aware count regressor. arXiv:1908.03314
Deb D, Ventura J (2018) An aggregated multicolumn dilated convolution network for perspective-free counting. In: 2018 IEEE/cvf conference on computer vision and pattern recognition workshops (CVPRW)
Liu M, Jiang J, Guo Z et al (2018) Crowd counting with fully convolutional neural network. In: 2018 25th IEEE international conference on image processing (ICIP). IEEE, pp 953–957
Wang Z, Xiao Z, Xie K et al (2018) In defense of single-column networks for crowd counting. In: BMVC
Dai F, Liu H, Ma Y et al (2019) Dense scale network for crowd counting. arXiv:1906.09707
Kang D, Chan AB (2018) Crowd counting by adaptively fusing predictions from an image pyramid. In: BMVC
Gao J, Wang Q, Li X (2019) Pcc net: perspective crowd counting via spatial convolutional network. arXiv:1905.10085
Hossain M, Hosseinzadeh M, Chanda O et al (2019) Crowd counting using scale-aware attention networks. IEEE Winter Conf Appl Comput Vis WACV 2019:1280–1288
Sindagi V, Patel VM (2019) Ha-ccn: hierarchical attention-based crowd counting network. IEEE Trans Image Process 29:323–335
Ranjan V, Shah M, Nguyen MH (2019) Crowd transformer network. arXiv:1904.02774
Sindagi V, Patel VM (2019) Inverse attention guided deep crowd counting network. In: 2019 16th IEEE international conference on advanced video and signal based surveillance (AVSS). pp 1–8
Kasmani SA, He X, Jia W et al (2018) A-ccnn: adaptive ccnn for density estimation and crowd counting. In: 2018 25th IEEE international conference on image processing (ICIP). pp 948–952
Tian Y, Lei Y, Zhang J et al (2018) Padnet: pan-density crowd counting. IEEE Trans Image Process 29:2714–2727
Zhang Y, Chang F, Wang M et al (2018) Auxiliary learning for crowd counting via count-net. Neurocomputing 273:190–198
Han K, Wan W, Yao H et al (2017) Image crowd counting using convolutional neural network and markov random field
Shi M, Yang Z, Xu C et al (2018) Revisiting perspective information for efficient crowd counting. IEEE CVF Conf Comput Vis Pattern Recognit CVPR 2019:7271–7280
Kumagai S, Hotta K, Kurita T (2017) Mixture of counting cnns: adaptive integration of cnns specialized to specific appearance for crowd counting. arXiv:1703.09393
Olmschenk G, Hao T, Zhu Z (2018) Crowd counting with minimal data using generative adversarial networks for multiple target regression. In: 2018 IEEE winter conference on applications of computer vision (WACV)
Chong S, Ai H, Bo B (2016) End-to-end crowd counting via joint learning local and global count
Xu C, Qiu K, Fu J et al (2019) Learn to scale: generating multipolar normalized density maps for crowd counting. IEEE CVF Int Conf Comput Vis (ICCV) 2019:8381–8389
Xiong H, Lu H, Liu C et al (2019) From open set to closed set: counting objects by spatial divide-and-conquer. IEEE CVF Int Conf Comput Vis (ICCV) 2019:8361–8370
Liu C, Weng X, Mu Y (2019) Recurrent attentive zooming for joint crowd counting and precise localization. In: 2019 IEEE/CVF conference on computer vision and pattern recognition (CVPR). IEEE, pp 1217–1226
Xiong F, Shi X, Yeung D-Y (2017) Spatiotemporal modeling for crowd counting in videos. IEEE Int Conf Comput Vis ICCV 2017:5161–5169
Shi X, Chen Z, Wang H et al (2015) Convolutional lstm network: a machine learning approach for precipitation nowcasting, pp 802–810
Fang Y, Zhan B, Cai W et al (2019) Locality-constrained spatial transformer network for video crowd counting. IEEE Int Conf Multimed Expo ICME 2019:814–819
Wu X, Xu B, Zheng Y et al (2019) Video crowd counting via dynamic temporal modeling. arXiv:1907.02198
Zou Z, Shao H, Qu X et al (2019) Enhanced 3d convolutional networks for crowd counting. arXiv:1908.04121
Zheng H, Lin Z, Cen J et al (2019) Cross-line pedestrian counting based on spatially-consistent two-stage local crowd density estimation and accumulation. IEEE Trans Circuits Syst Video Technology 29(3):787–799
He G, Chen Q, Jiang D et al (2017) A double-region learning algorithm for counting the number of pedestrians in subway surveillance videos. Eng Appl Artif Intell 64:302–314
He G, Ma Z, Huang B et al (2019) Dynamic region division for adaptive learning pedestrian counting. IEEE Int Conf Multimed Expo ICME 2019:1120–1125
Redmon J, Farhadi A (2018) Yolov3: an incremental improvement. arXiv:1804.02767
Lian D, Li J, Zheng J et al (2019) Density map regression guided detection network for rgb-d crowd counting and localization. In: Proceedings of the IEEE conference on computer vision and pattern recognition. pp 1821–1830
Lin TY, Goyal P, Girshick R et al (2017) Focal loss for dense object detection. IEEE Trans Pattern Anal Mach Intell 99:2999–3007
Sam DB, Peri SV, Mukuntha NS et al (2020) Locate, size and count: accurately resolving people in dense crowds via detection. In: IEEE transactions on pattern analysis and machine (intelligence)
Hu P, Ramanan D (2017) Finding tiny faces. IEEE Conf Comput Vis Pattern Recognit CVPR 2017:1522–1530
Jiang S, Lu X, Lei Y et al (2019) Mask-aware networks for crowd counting. arXiv:1901.00039
Kang D, Dhar D, Chan AB (2016) Crowd counting by adapting convolutional neural networks with side information. arXiv:1611.06748
Marsden M, McGuinness K, Little S et al (2017) Fully convolutional crowd counting on highly congested scenes. arXiv:1612.00220
Valloli VK, Mehta K (2019) W-net: reinforced u-net for density map estimation. arXiv:1903.11249
Ronneberger O, Fischer P, Brox T (2015) U-net: convolutional networks for biomedical image segmentation. arXiv:1505.04597
Ding X, Lin Z, He F et al (2018) A deeply-recursive convolutional network for crowd counting. In: 2018 IEEE international conference on acoustics, speech and signal processing (ICASSP). IEEE, pp 1942–1946
Zhao M, Zhang J, Zhang C et al (2019) Leveraging heterogeneous auxiliary tasks to assist crowd counting. In: Proceedings of the IEEE conference on computer vision and pattern recognition, pp 12736–12745
Wan J, Luo W, Wu B et al (2019) Residual regression with semantic prior for crowd counting. In: Proceedings of the IEEE conference on computer vision and pattern recognition. pp 4036–4045
Huang S, Li X, Zhang Z et al (2018) Body structure aware deep crowd counting. IEEE Trans Image Process 27:1049–1059
Yang Y, Li G, Wu Z et al (2020) Reverse perspective network for perspective-aware object counting. IEEE CVF Conf Compu Vis Pattern Recognit CVPR 2020:4373–4382
hwan Oh M, Olsen PA, Ramamurthy KN (2020) Crowd counting with decomposed uncertainty. arXiv:1903.07427
Shi Z, Zhang L, Sun Y et al (2018) Multiscale multitask deep netvlad for crowd counting. IEEE Trans Industr Inf 14(11):4953–4962
Wei X, Du J, Liang M et al (2017) Boosting deep attribute learning via support vector regression for fast moving crowd counting. Pattern Recognit Lett 119:12–23
Shi Z, Le Z, Yun L et al (2018) Crowd counting with deep negative correlation learning. In: 2018 IEEE/CVF conference on computer vision and pattern recognition (CVPR)
Oncel T (2008) Pedestrian detection via classification on riemannian manifolds. IEEE Trans Pattern Anal Mach Intell 30:1713–1727
Arteta C, Lempitsky V, Zisserman A (2016) Counting in the wild
Marsden M, McGuinness K, Little S et al (2017) Resnetcrowd: a residual deep learning architecture for crowd counting, violent behaviour detection and crowd density level classification. In: 2017 14th IEEE international conference on advanced video and signal based surveillance (AVSS), pp 1–7
Liu Y, Liu L, Wang P et al. (2020) Semi-supervised crowd counting via self-training on surrogate tasks. arXiv:2007.03207
Yang Y, Wu Z, Su L et al (2020) Weakly-supervised crowd counting learns from sorting rather than locations
Wang Q, Gao J, Lin W et al. (2020) Nwpu-crowd: a large-scale benchmark for crowd counting. In: IEEE transactions on pattern analysis and machine intelligence
Oghaz MM, Khadka AR, Argyriou V et al (2019) Content-aware density map for crowd counting and density estimation. arXiv:1906.07258
Olmschenk G, Tang H, Zhu Z (2019) Improving dense crowd counting convolutional neural networks using inverse k-nearest neighbor maps and multiscale upsampling.arXiv:1902.05379
Ma Z, Wei X, Hong X et al (2019) Bayesian loss for crowd count estimation with point supervision. IEEE CVF Int Conf Comput Vis ICCV 2019:6141–6150
Wang Z, Bovik AC, Sheikh HR et al (2004) Image quality assessment: from error visibility to structural similarity. IEEE Trans Image Process 13:600–612
Sindagi VA, Patel VM (2017) Cnn-based cascaded multi-task learning of high-level prior and density estimation for crowd counting. In: 2017 14th IEEE international conference on advanced video and signal based surveillance (AVSS). pp 1–6
Sam DB, Babu RV (2018) Top-down feedback for crowd counting convolutional neural network. In: AAAI
Zhang L, Shi Z, Cheng M-M et al (2019) Nonlinear regression via deep negative correlation learning. In: IEEE transactions on pattern analysis and machine intelligence
Shi Z, Mettes P, Snoek CGM (2019) Counting with focus for free. IEEE CVF Int Conf Comput Vis ICCV 2019:4199–4208
Chen X, Bin Y, Sang N et al (2019) Scale pyramid network for crowd counting. IEEE Winter Conf Appl Comput Vis WACV 2019:1941–1950
Liu L, Qiu Z, Li G et al (2019) Crowd counting with deep structured scale integration network. IEEE CVF Int Conf Comput Vis ICCV 2019:1774–1783
Yan Z, Yuan Y, Zuo W et al (2019) Perspective-guided convolution networks for crowd counting. IEEE CVF Int Conf Comput Vis ICCV 2019:952–961
Lin T-Y, Maire M, Belongie SJ et al (2014) Microsoft coco: common objects in context. arXiv:1405.0312
Dollár P, Wojek C, Schiele B et al (2012) Pedestrian detection: an evaluation of the state of the art. IEEE Trans Pattern Anal Mach Intell 34:743–761
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Li, B., Huang, H., Zhang, A. et al. Approaches on crowd counting and density estimation: a review. Pattern Anal Applic 24, 853–874 (2021). https://doi.org/10.1007/s10044-021-00959-z
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DOI: https://doi.org/10.1007/s10044-021-00959-z