Compression-Dependent Transform-Domain Downward Conversion for Block-Based Image Coding

2018 ◽  
Vol 27 (6) ◽  
pp. 2635-2649 ◽  
Author(s):  
Shuyuan Zhu ◽  
Zhiying He ◽  
Xiandong Meng ◽  
Jiantao Zhou ◽  
Bing Zeng
Keyword(s):  
Image Coding ◽  
Transform Domain ◽  
Block Based

Low bit-rate cloud-based image coding in the wavelet transform domain

2018 ◽  
Vol 12 (8) ◽  
pp. 1437-1445 ◽  
Author(s):  
Chuxi Yang ◽  
Yan Zhao ◽  
Shigang Wang
Keyword(s):  
Wavelet Transform ◽  
Image Coding ◽  
Transform Domain ◽  
Bit Rate ◽  
Low Bit Rate

Intra-Predictive Transforms for Block-Based Image Coding

2009 ◽  
Vol 57 (8) ◽  
pp. 3030-3040 ◽  
Author(s):  
Jizheng Xu ◽  
Feng Wu ◽  
Wenjun Zhang
Keyword(s):  
Image Coding ◽  
Block Based

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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