Results 41 to 50 of about 224 (152)

Breast cancer detection using combined curvelet based enhancement and a novel segmentation methods

Biomedical Papers, 2015
Aim: This paper describes the digital implementation of a mathematical transform namely 2D Fast Discrete Curvelet Transform (FDCT) via UnequiSpaced Fast Fourier Transform (USFFT) in combination with the novel segmentation method for effective detection ...
Balasubramaniam Senthilkumar, Govindaswamy Umamaheswari   +1 more
doaj   +1 more source

Orthonormal finite ridgelet transform for image compression [PDF]

Proceedings 2000 International Conference on Image Processing (Cat. No.00CH37101), 2000
A finite implementation of the ridgelet transform is presented. The transform is invertible, non-redundant and achieved via fast algorithms. Furthermore we show that this transform is orthogonal hence it allows one to use non-linear approximations for the representation of images. Numerical results on different test images are shown.
Do, Minh N., Vetterli, Martin
openaire   +2 more sources

Ridgelet transform applied to motion compensated images [PDF]

2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)., 2003
The wavelet transform is a powerful instrument in catching zero-dimensional singularities. Ridgelets are a powerful instrument in catching and representing monodimensional singularities in bidimensional space. The continuous ridgelet transform, defined by E.J. Candes and D.L. Donoho (see Phil. Trans. R. Soc. Lond.
Granai, L., Moschetti, F., Vandergheynst, P.   +2 more
openaire   +1 more source

Application of Genetic Algorithm and Particle Swarm Optimization techniques for improved image steganography systems

Open Physics, 2016
Image steganography is one of the ever growing computational approaches which has found its application in many fields. The frequency domain techniques are highly preferred for image steganography applications.
Jude Hemanth Duraisamy, Umamaheswari Subramaniyan, Popescu Daniela Elena, Naaji Antoanela   +3 more
doaj   +1 more source

Ridgelet Transform Based on Reveillès Discrete Lines [PDF]

, 2002
In this paper we present a new discrete implementation of ridgelet transforms based on Reveilles discrete 2D lines. Ridgelet transforms are particular invertible wavelet transforms. Our approach uses the arithmetical thickness parameter of Reveilleslinesto adapt the Ridgelet transform to specific applications.We illustrate this with a denoising and a ...
Philippe Carré, Eric Andres
openaire   +2 more sources

On the subexponentiality of the ridgelet transform

Comptes Rendus. Mathématique, 2014
We show that we can consider the ridgelet transform for Wiener functionals as a subexponential random variable. We give an application of this result to random walks.
openaire   +1 more source

Active Seismic Exploration of Planetary Subsurfaces via Compressive Sensing

Earth and Space Science, Volume 12, Issue 3, March 2025.
Abstract Geophysical measurements, such as seismic experiments, are a key target for scientific activities on planetary surfaces. Dense spatial sampling of such measurements is often desirable, and acquisition is traditionally performed at regular intervals.
Jingchuan Wang, Nicholas C. Schmerr, Vedran Lekić, Jacob Giles, Linden Wike, Austin Hoyle, Ernest Robert Bell, Naoma McCall, Jacob A. Richardson, Patrick Whelley, John D. West, Shannon Rees, Casey Braccia, Caela Barry, Jose M. Hurtado, Tara Sweeney, Nohemi Valenzuela   +16 more
wiley   +1 more source

Blind image separation using pyramid technique

EURASIP Journal on Image and Video Processing, 2018
Signal and image separation is an important processing step for accurate image reconstruction, which is increasingly applied to many medical imaging applications and communication systems.
M. Y. Abbass, HyungWon Kim
doaj   +1 more source

A Note on Fractional Gabor Systems in L2(ℝ)

Journal of Function Spaces, Volume 2024, Issue 1, 2024.
In this article, fractional Gabor frames in L2(ℝ) are defined and studied. Also, a finite linear combination of fractional Gabor frames for L2(ℝ) is discussed. It is proved that under certain conditions, a finite linear combination of fractional Gabor frames is a fractional Gabor frame for L2(ℝ).
Dolly Jain, Mina Kumari, Sandeep Kumari, Nikhil Khanna   +3 more
wiley   +1 more source

Robust medical image watermarking based on Ridgelet transform and Ant Colony Optimization for telemedicine security

Systems and Soft Computing
The development of telemedicine needs strong solutions to prevent manipulation of medical data while maintaining accurate diagnosis. Current watermarking methods aim to establish an effective compromise between robustness, imperceptibility, and payload ...
Ahmed Saïd Beggari, Ali Wali, Amine Khaldi, Med Redouane Kafi, Sahu Aditya Kumar   +4 more
doaj   +1 more source