Banca de DEFESA: ANDY MARTIN RAMOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ANDY MARTIN RAMOS
DATE: 23/07/2021
TIME: 10:00
LOCAL: Videoconferência (Google Meet): meet.google.com/vgn-zhhb-nrb
TITLE:

NEW FRAGILE IMAGE WATERMARKING SCHEMES USING CHAOTIC SEQUENCES.

KEY WORDS:

Fragile watermarking. Chaotic maps. Error correcting codes. Discrete Wavelet Transform. Tamper detection.

PAGES: 65
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUMMARY:

With the rapid development of digital signal processing tools, image contents can be easily manipulated or maliciously tampered. Fragile watermarking has been largely used for content authentication purpose. This dissertation presents new proposals for image fragile watermarking algorithms for tamper detection and image recovery. The watermarked bits are obtained from the parity bits of an error-correcting code whose message is formed from a binary chaotic sequence and from bits of the original image. In the first proposed algorithm, the watermarked bits are inserted in the frequency domain using the Discrete Wavelet Transform. The imperceptibility, detection, and recovery of this algorithm are tested for various attacks used in signal processing. In the second method, the watermarks bits are embedded using the least significant bit method. A comparison between the proposed algorithms shows that the former exhibits greater imperceptibility, while the latter exhibits better recover capability. The proposed algorithms are analyzed both for grayscale and color images. Comparison results reveal that the proposed technique perform better than some existing methods.  

  

BANKING MEMBERS:
Presidente - 1285209 - CECILIO JOSE LINS PIMENTEL
Interno - 3130399 - VALDEMAR CARDOSO DA ROCHA JUNIOR
Interno - 1851787 - DANIEL PEDRO BEZERRA CHAVES
Externo à Instituição - CARLOS EDUARDO CORREIA DE SOUZA - UFPE