Head Tracking 21

CroHD provides tracking annotation of pedestrian heads in densely populated video sequences. It consists of 2,276,838 human heads in 11,463 frames across 9 sequences of Full-HD resolution. We built CroHD upon 5 sequences from the publicly available MOTChallenge CVPR19 benchmark to enable performance comparison of trackers in the same scene between two paradigms - head tracking and pedestrian tracking. We further annotated 4 new sequences of higher crowd densities in two new scenarios. The new scenario centers on the Shibuya Train station and Shibuya Crossing, one of the busiest pedestrian crossings in the world. All sequences in CroHD have a framerate of 25fps and are captured from an elevated viewpoint. The sequences involve crowded indoor and outdoor scenes, recorded across different lighting and environmental conditions.

Training Set

Sample	Name	FPS	Resolution	Length	Tracks	Boxes	Density	Description	Source	Ref.
	HT21-04	25	1920x1080	997 (00:40)	580	175479	176.0	Crowded outdoor train station.	link	[1]
	HT21-03	25	1920x1080	1000 (00:40)	811	257939	257.9	Crowded pedestrian crossing.	link	[1]
	HT21-02	25	1920x1080	3315 (02:13)	1276	733622	221.3	People leaving entrance of stadium by night time, elevated viewpoint.	link	[1]
	HT21-01	25	1920x1080	429 (00:17)	85	21456	50.0	Crowded indoor train station.	link	[1]
	Total			5741 frm. (230 s.)	2752	1188496	207.0

Test Set

Sample	Name	FPS	Resolution	Length	Tracks	Boxes	Density	Description	Source	Ref.
	HT21-15	25	1920x734	1008 (00:40)	321	149821	148.6	A pedestrian street scene.	link	[1]
	HT21-14	25	1920x1080	1050 (00:42)	1040	258227	245.9	Crowded outdoor train station.	link	[1]
	HT21-13	25	1920x1080	1000 (00:40)	734	259603	259.6	Crowded pedestrian crossing.	link	[1]
	HT21-12	25	1920x1080	2080 (01:23)	737	380647	183.0	People leaving entrance of stadium by night time, elevated viewpoint.	link	[1]
	HT21-11	25	1920x1080	585 (00:23)	133	38492	65.8	Crowded indoor train station.	link	[1]
	Total			5723 frm. (228 s.)	2965	1086790	189.9

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