scholarly journals QR Factorization on a Multicore Node Enhanced with Multiple GPU Accelerators

2011 ◽  
Author(s):  
Emmanuel Agullo ◽  
Cedric Augonnet ◽  
Jack Dongarra ◽  
Mathieu Faverge ◽  
Hatem Ltaief ◽  
...  
Keyword(s):  
Qr Factorization

scholarly journals Householder QR Factorization With Randomization for Column Pivoting (HQRRP)

2017 ◽  
Vol 39 (2) ◽  
pp. C96-C115 ◽  
Author(s):  
Per-Gunnar Martinsson ◽  
Gregorio Quintana OrtÍ ◽  
Nathan Heavner ◽  
Robert van de Geijn
Keyword(s):  
Qr Factorization ◽  
Column Pivoting

scholarly journals Image Hiding Using QR Factorization And Discrete Wavelet Transform Techniques

2021 ◽  
Vol 6 (2) ◽  
pp. 72-81
Author(s):  
Reham Ahmed El-Shahed ◽  
◽  
Maryam Al-Berry ◽  
Hala Ebied ◽  
Howida A. Shedeed ◽  
...  
Keyword(s):  
Data Security ◽  
Color Image ◽  
Simple Algorithm ◽  
Qr Factorization ◽  
Discrete Wavelet ◽  
Huge Amount ◽  
Image Hiding ◽  
Media Applications ◽  
Very High ◽  
Better Than

Steganography is one of the most important tools in the data security field as there is a huge amount of data transferred each moment over the internet. Hiding secret messages in an image has been widely used because the images are mostly used in social media applications. The proposed algorithm is a simple algorithm for hiding an image in another image. The proposed technique uses QR factorization to conceal the secret image. The technique successfully hid a gray and color image in another one and the performance of the algorithm was measured by PSNR, SSIM and NCC. The PSNR for the cover image was in the range of 41 to 51 dB. DWT was added to increase the security of the method and this enhanced technique increased the cover PSNR to 48 t0 56 dB. The SSIM is 100% and the NCC is 1 for both implementations. Which improves that the imperceptibility of the algorithm is very high. The comparative analysis showed that the performance of the algorithm is better than other state-of-the-art algorithms

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