Estimation of number of people in crowded scenes using perspective transformation

Sheng-Fuu Lin*, Jaw Yeh Chen, Hung Xin Chao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

228 Scopus citations


In the past, the estimation of crowd density has become an important topic in the field of automatic surveillance systems. In this paper, the developed system goes one step further to estimate the number of people in crowded scenes in a complex background by using a single image. Therefore, more valuable information than crowd density can be obtained. There are two major steps in this system: recognition of the head-like contour and estimation of crowd size. First, the Haar wavelet transform (HWT) is used to extract the featured area of the head-like contour, and then the support vector machine (SVM) is used to classify these featured area as the contour of a head or not. Next, the perspective transforming technique of computer vision is used to estimate crowd size more accurately. Finally, a model world is constructed to test this proposed system and the system is also applied for real-world images.

Original languageEnglish
Pages (from-to)645-654
Number of pages10
JournalIEEE Transactions on Systems, Man, and Cybernetics Part A:Systems and Humans.
Issue number6
StatePublished - 1 Nov 2001


  • Crowd density
  • Crowd size
  • Perspective transform

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