A visible digital watermarking system using perceptual models

Q. Cheng, T. S. Huang

Research output: Contribution to journalArticlepeer-review


This paper presents a visible watermarking system using perceptual models. A watermark image is overlaid translucently onto a primary image, for the purposes of immediate claim of copyright, instantaneous recognition of owner or creator, or deterrence to piracy of digital images or video. The watermark is modulated by exploiting combined DCT-domain and DWT-domain perceptual models. The resulting watermarked image is visually pleasing and unobtrusive. The location, size and strength of the watermark vary randomly with the underlying image. The randomization makes the automatic removal of the watermark difficult even though the algorithm is known publicly but the key to the random sequence generator. The experiments demonstrate that the watermarked images have pleasant visual effect and strong robustness. The watermarking system can be used in copyright notification and protection.

Original languageEnglish (US)
Pages (from-to)296-304
Number of pages9
JournalProceedings of SPIE- The International Society for Optical Engineering
StatePublished - 2001
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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