Astronomical image manipulation in the discrete wavelet transform domain

2000 ◽  
Vol 9 (2) ◽  
pp. 101
Author(s):  
Shahram Latifi
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Image Manipulation ◽  
Discrete Wavelet ◽  
Transform Domain ◽  
Astronomical Image

Digital Image Steganography Scheme for Speech Signals in the Discrete Wavelet Transform Domain

2020 ◽  
Vol 24 (3) ◽  
Author(s):  
Ariel Rodriguez Mendez ◽  
Clara Cruz Ramos ◽  
Rogelio Reyes Reyes ◽  
Volodymyr Ponomaryov
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Digital Image ◽  
Image Steganography ◽  
Speech Signals ◽  
Discrete Wavelet ◽  
Transform Domain

scholarly journals Performance Evaluation of Block based Video Watermarking after Attacks

2019 ◽  
Vol 8 (2S11) ◽  
pp. 225-233
Keyword(s):  
Performance Evaluation ◽  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Digital Media ◽  
Video Watermarking ◽  
Discrete Wavelet ◽  
Transform Domain ◽  
Video Frames ◽  
Block Based

In today’s era use of digital media is most popular way of communication. Digital media covers images, videos and animations available online. The easy methods of accessing, copying and editing digital media have made them more popular. With several advantages these easy methods of copying and editing data have created some big issues like ownership identification. This increases the demand of protecting online digital media. Watermarking is solution of such problem. In this work, a block-based method has been proposed for video watermarking that uses a key at the time of embedding and extraction. Some frames are selected from the video according to a key. Watermark is embedded on the selected frames after dividing into parts called blocks. Each part of the watermark is embedded in one selected frame of the video. This method increases the security of the system as the complete watermark cannot be extracted without knowing the positions of watermarked frames and the position of the block in that frame. Watermarking is performed in the Discrete Wavelet Transform domain after scaling of watermark data. To show the authenticity of proposed scheme various attacks are applied on different watermarked video frames and extracted watermark results are shown under different tables.

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