16 citations · 42 across the 8 of their papers we have counts for
11 papers
Sociological Explanation of Fear of Crime in Public Spaces Case Study Mashhad
Mahdie Rezvani, Yaser Sadra
Fear of crime is an especially a problem that has troubled the urban communities, affected the urban dissatisfaction and many factors in the city have created and intensified it. F…
A new image compression by gradient Haar wavelet
Yaser Sadra
With the development of human communications the usage of Visual Communications has also increased. The advancement of image compression methods is one of the main reasons for the…
Image Encryption Based On Gradient Haar Wavelet and Rational Order Chaotic Maps
Sodeif Ahadpour, Yaser Sadra, Meisam Sadeghi
Haar wavelet is one of the best mathematical tools in image cryptography and analysis. Because of the specific structure, this wavelet has the ability which is combined with other…
Chaotic trigonometric Haar wavelet with focus on image encryption
Sodeif Ahadpour, Yaser Sadra
In this paper, after reviewing the main points of Haar wavelet transform and chaotic trigonometric maps, we introduce a new perspective of Haar wavelet transform. The essential ide…
A Chaos-based Image Encryption Scheme using Chaotic Coupled Map Lattices
Sodeif Ahadpour, Yaser Sadra
In recent years, information security essential in various arenas like internet communication, multimedia systems, medical imaging, tele-medicine and military communication. Howeve…
Public key Steganography Using Discrete Cross-Coupled Chaotic Maps
Sodeif Ahadpour, Mahdiyeh Majidpour, Yaser Sadra
By cross-coupling two logistic maps a novel method is proposed for the public key steganography in JPEG image. Chaotic maps entail high complexity in the used algorithm for embeddi…