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Challenges in Watermark Extraction Post-Noise Addition: A Study

This research delves into the difficulties of extracting embedded watermarks after applying noise addition in image editing, specifically using Photoshop. It highlights that every pixel undergoes a change during noise application, leading to the watermark becoming irretrievable. The study explores the effects of different noise rates and JPEG compression levels on watermark robustness, demonstrating that such alterations can compromise the visibility and integrity of the watermark, thus making it vulnerable to attacks.

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Challenges in Watermark Extraction Post-Noise Addition: A Study

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Presentation Transcript

  1. Homework 1.watermarking 劉晟志 2010/03/21

  2. Hide “nsysu logo” into the 3rd bit plane

  3. PSNR: 42.092 dB Original Post

  4. Discuss: • why can’t we extract the watermarking after doing the “Noise adding” by Photoshop? • Every pixel had been change during the process • The noise rate only decides the weight of the noise that will be add to every pixel • As the result, the watermarking can not avoid attack • Add black spot noise

  5. Add black spot noise with different occur rate (gray level watermarking) 10% 20% 5% 15%

  6. Add black spot noise with different occur rate (binary watermarking) 10% 20% 5% 15%

  7. Different JPEG compress rate 10% 20% 5% 15% Cover image Water marking

  8. Discuss: • why can’t we extract the watermarking after doing the “Noise adding” by Photoshop? • Every pixel had been change during the process • The noise rate only decides the weight of the noise that will be add to every pixel • As the result, the watermarking can not avoid this kind of noise attack

  9. End

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