Blind Watermarking Arithmetic for Color Image Based on Discrete Wavelet Transform

2016 ◽  
Author(s):  
Zhongfeng Qu ◽  
Ying Fang ◽  
Honghua Wu
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Color Image ◽  
Discrete Wavelet ◽  
Blind Watermarking

Hybrid Color Image Compression Using Discrete Cosine Transform and Discrete Wavelet Transform

2012 ◽  
Vol 198-199 ◽  
pp. 244-248 ◽  
Author(s):  
Ling Tang ◽  
Ming Ju Chen ◽  
Hong Song
Keyword(s):  
Wavelet Transform ◽  
Image Compression ◽  
Discrete Wavelet Transform ◽  
Discrete Cosine Transform ◽  
Color Image ◽  
Low Frequency ◽  
Huffman Coding ◽  
Discrete Wavelet ◽  
Cosine Transform ◽  
Color Image Compression

In this research we undertake a study of image compression based on the discrete cosine transform(DCT) and discrete wavelet transform(DWT). Then a hybrid color image compression algorithm based on DCT and DWT is proposed. This algorithm is implemented through transform the color image using DWT in the YCbCr space first, and then DCT in the low frequency, adopt huffman coding, RLE and arithmetic coding in the encoded mode. In experiments, the results outperform the only DCT and the only DWT typically higher in peak signal-to-noise ratio and have better visual quality.

scholarly journals A Robust Algorithm of Digital Image Watermarking Based on Discrete Wavelet Transform

2011 ◽  
pp. 58-63
Author(s):  
Shital Gupta ◽  
SANJEEV JAIN
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Digital Image ◽  
Image Watermarking ◽  
Theoretical Models ◽  
Discrete Wavelet ◽  
Blind Watermarking ◽  
Digital Image Watermarking ◽  
Robust Algorithm ◽  
Frequency Spread

In this paper, a robust algorithm of digital image watermarking based on discrete wavelet transform is introduced It uses blind watermarking technique. Digital image watermarking is one such technology that has been developed to protect digital images from illegal manipulations. In particular, digital image watermarking algorithms which are based on the discrete wavelet transform have been widely recognized to be more prevalent than others. This is due to the wavelets' excellent spatial localization, frequency spread, and multi-resolution characteristics, which are similar to the theoretical models of the human visual system.

scholarly journals SVD-Based Color Image Watermarking Using Discrete Wavelet Transform

2011 ◽  
Vol 1 ◽  
pp. 209-213
Author(s):  
Wang Sheng Fang ◽  
Rong Zhang ◽  
Yu Nan Li ◽  
Lu Lu Wu
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Color Image ◽  
Image Watermarking ◽  
Singular Value ◽  
Discrete Wavelet ◽  
Color Image Watermarking ◽  
Additional Advantage ◽  
Process Modification ◽  
Value Decomposition

For invisibility and robustness are difficult to reconcile, a combination of singular value decomposition (SVD) and the discrete wavelet transform (DWT) of the color image adaptive watermarking algorithm is proposed. In the embedding process, modification of the singular value of LL band and LH band exploited to the watermarking scheme which excellent preserves the quality. The additional advantage of the proposed technique is taking advantage of HVS which can adaptively regulate the watermark embedding strength. Experimental results show that the algorithm not only has better transparency, but also has good robustness such as noise, compression, filtering, cropping.

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