Title: Image watermarking

Member:  Chu, Hsi-Cheng


Abstract:

    Image wartermarking is a technique to embed some secret information
in the image without changing the format of the image.  Its applications
include copy protection, data authentication, indexing and data hiding
etc.  Information Embedding can be achieved by modifying the pixel
value.  In most applications, the most important two concerns are
imperceptibility and robustness.  The imperceptibility means that the
watermarking algorithm must embed the watermark such that this does not
affect the quality of the underlying host image.  The robustness means
the watermark always remains in the host image, even if the quality of
the host image is degraded, intentionally or unintentionally.  In the
project, some watermarking algorithms are explored and simulated,
including algorithms in spatial domain and frequency domain.  Some
experiments of extracting information from degraded host images like
compression and blurring are also tested in the project.