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ELEC 483

Add a nifty digital watermark to an image by massaging the DCT coefficients. Adding a watermark results in almost no image quality degradation.

Be sneaky and use it to pass messages!

Usage

  1. Encoding: Call wm_encoder in MATLAB. Give it an image and phrase (up to 33 characters) when prompted.
  2. Decoding: Call wm_decoder. Give it the watermarked and original image. Maybe v2 will be able to do a blind extraction and decode.

You can read the report for a lengthy explanation of how it works.