A blind block based DCT watermarking technique for gray level images using one dimensional Walsh coding

Ahmed, Kamal A.; Al-Ahmad, Hussain; Gaydecki, Patrick

doi:10.1109/ctit.2009.5423140

Cited by 9 publications

(5 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Walsh coding is used in this method to increase the robustness of the digital watermark [9]. Walsh functions are orthogonal and contain length elements.…”

Section: Walsh Coding Of Signaturementioning

confidence: 99%

1-D Walsh coded watermarking technique for colour images using the Y channel

Ahmed

Al-Ahmad

Gaydecki

2011

2011 IEEE GCC Conference and Exhibition (GCC)

Self Cite

View full text Add to dashboard Cite

In this paper a new blind technique using one dimensional Walsh coding to improve the robustness of image watermarking is presented. The proposed technique inserts the binary bits of handwritten signatures in the DCT blocks of the Y channel of the digital color image. The 1-D Walsh coding can be applied either horizontally or vertically. The work was carried out using the horizontal 1-D Walsh coding. Results prove that the use of Walsh coding has improved robustness against JPEG compression.

show abstract

“…Walsh coding is used in this method to increase the robustness of the digital watermark [9]. Walsh functions are orthogonal and contain length elements.…”

Section: Walsh Coding Of Signaturementioning

confidence: 99%

1-D Walsh coded watermarking technique for colour images using the Y channel

Ahmed

Al-Ahmad

Gaydecki

2011

2011 IEEE GCC Conference and Exhibition (GCC)

Self Cite

View full text Add to dashboard Cite

show abstract

“…This process is carried on all signatures' pixels. This involves man ipulations with Hadamard matrices as detailed in [10,11]. An example of Walsh functions with length=8 is:…”

Section: Walsh Codi Ng Of Signaturementioning

confidence: 99%

1-D Walsh Coding With DCT Block Watermarking Technique of Colour Images Using Y Channel

Ahmed

Al-Ahmad²,

Gaydecki³

2012

AJSP

Self Cite

View full text Add to dashboard Cite

In this paper a new blind technique using one dimensional Walsh coding to improve the robustness of image watermarking is presented. The proposed technique inserts the binary bits of handwritten signatures in the DCT blocks of the Y channel of the digital colour image. Watermarking algorith m wh ich uses 1-D Walsh coding to embed mobile phone digits in images captured by the phone camera is also introduced. The 1-D Walsh coding can be applied either horizontally or vertically. The results presented here were obtained for horizontal 1-D Walsh coding. These results prove that the use of Walsh coding has improved robustness against JPEG co mpression.

show abstract

“…This is due to the array formed by the kernals is a symmetric matrix having orthogonal rows and columns, so its inverse array is the same as the array itself. The concept of frequency exists also in Walsh transform basis functions [2]. We can think of frequency as the number of zero crossings or the number of transitions in a basis vector and we call this number sequence.…”

Section: Introductionmentioning

confidence: 99%

Estimation of wavelet filters in color image coding using WWT technique

Vijayabhaskar

Raajan

2013

2013 Ieee Conference on Information and Communication Technologies

View full text Add to dashboard Cite

In this study, we are presenting WWT (Walsh Wavelet Transform) technique to compress an image. In recent times, DWT (Discrete Wavelet Transform) & WT (Walsh Transform) are developed as a prevalent methods for compressing an image. In this, WT (Wavelet Transform) is one such significant transform of image compression. Outcome of this is altered with the wavelet type changes. In this paper, we used MSE & PSNR parameters to estimate the performance of several wavelets in image compression. The wavelet filters used in this process are Daubechies (db-x), Discrete meyer (dmey), Coiflets (coif-x), Biorthogonal (bior -x), Symlets (sym-x), Reverse Biorthogonal (rbiox) along with 3 different color images. With this results,it is suggested that good choice of wavelet improves the quality as well as PSNR remarkably. MSE versus PSNR simulation results are tabulated with different wavelet filters. These results yielded 'dmey' wavelet filter produced better results.

show abstract

A blind block based DCT watermarking technique for gray level images using one dimensional Walsh coding

Cited by 9 publications

References 4 publications

1-D Walsh coded watermarking technique for colour images using the Y channel

1-D Walsh coded watermarking technique for colour images using the Y channel

1-D Walsh Coding With DCT Block Watermarking Technique of Colour Images Using Y Channel

Estimation of wavelet filters in color image coding using WWT technique

Contact Info

Product

Resources

About