Digital Watermarking

    The digital watermarking is to embed copyright information into the digital media. When a copyright problem is issued we can resolve the problem by extracting the watermark from the media. It can be visible or invisible. The invisible watermarking is more practical because they do not introduce the visible damage to the image. In invisible watermarking, the watermark can be robust or fragile according to the applications. In the fragile watermarking, the watermark should be easily broken with slight attacks so that any changes that have been made to the content of the media can be detected. In the robust watermarking, the watermark should survive against the various attacks and the removal of watermark should introduce the considerable impairment to the watermarked image. In the watermark embedding process, the original image is transformed to frequency domain (DCT, DFT, DWT) and a watermark is added to the original image to produce a watermarked image. The extraction is a reverse process of embedding; the suspected image is transformed to frequency domain and then, the watermark is extracted from the image.


  Digital Watermarking
  Intelligent Digital Satellite Receiver System
  PCB Soldering Inspection
  Digital Signal Processing
  Image Processing
  Machine/Robot Vision
  Statistical Signal Processing
  Pattern Recognition
  Image Compression


Digital Video


Visual Communications