DWT image encoding and message correction on printed images

Roxas, Francis

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https://hdl.handle.net/2142/104033 Copy

Description

Title

DWT image encoding and message correction on printed images

Author(s)

Roxas, Francis

Contributor(s)

Moulin, Pierre

Issue Date

2019-05

Keyword(s)

• Discrete Wavelet Transforms
• Reed Solomon Codes

Abstract

As more information gets stored digitally, intellectual property (IP) holders needed a way to protect their content from being reused without their permission. One way that IP holders protect their content is through the use of watermarks which are pieces of information that are embedded in the IP holder’s content. This thesis explores the use and effectiveness of watermarking techniques on printed images. Specifically, this thesis explores techniques to embed printed images with a watermark and to retrieve those same watermarks from photographs of those images. The watermarks found in these images suffer from various different degradation effects which may compromise the message that is being transferred in the paper. To alleviate these degradations, the messages will be encoded into the images using Error Correction Codes that will help the user retrieve some of the information that would be lost as a result of these effects. Experiments are performed using a two-dimensional Discrete Wavelet Transformation and various Error Correction Coding Techniques including repetition Error Correction codes, Hamming encoding, and Reed Solomon encoding schemes. These experiments are performed on various logos.

Type of Resource

text

Language

en

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http://hdl.handle.net/2142/104033

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