Large-area, multilayered, and high-resolution visual monitoring using a dual-camera system

Chih Wei Lin, Kuan-Wen Chen, Shen Chi Chen, Cheng Wu Chen, Yi Ping Hung

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Large-area, high-resolution visual monitoring systems are indispensable in surveillance applications. To construct such systems, high-quality image capture and display devices are required. Whereas high-quality displays have rapidly developed, as exemplified by the announcement of the 85-inch 4K ultrahigh-definition TV by Samsung at the 2013 Consumer Electronics Show (CES), high-resolution surveillance cameras have progressed slowly and remain not widely used compared with displays. In this study, we designed an innovative framework, using a dual-camera system comprising a wide-angle fixed camera and a high-resolution pan-tilt-zoom (PTZ) camera to construct a large-area, multilayered, and high-resolution visual monitoring system that features multiresolution monitoring of moving objects. First, we developed a novel calibration approach to estimate the relationship between the two cameras and calibrate the PTZ camera. The PTZ camera was calibrated based on the consistent property of distinct pan-tilt angle at various zooming factors, accelerating the calibration process without affecting accuracy; this calibration process has not been reported previously. After calibrating the dual-camera system, we used the PTZ camera and synthesized a large-area and high-resolution background image. When foreground targets were detected in the images captured by the wide-angle camera, the PTZ camera was controlled to continuously track the user-selected target. Last, we integrated preconstructed high-resolution background and low-resolution foreground images captured using the wide-angle camera and the high-resolution foreground image captured using the PTZ camera to generate a large-area, multilayered, and high-resolution view of the scene.

Original languageEnglish
Article number30
JournalACM Transactions on Multimedia Computing, Communications and Applications
Issue number2
StatePublished - 1 Dec 2014


  • Dual-camera system
  • Large-area, multilayered, and high-resolution system
  • PTZ camera
  • Visual monitoring
  • Wide-angle fixed camera

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