Fractal Image Coding Based on Wavelet Transformation

2014 ◽  
Vol 1030-1032 ◽  
pp. 1713-1716
Author(s):  
Xin Wang ◽  
He Pan
Keyword(s):  
Image Coding ◽  
Wavelet Decomposition ◽  
Wavelet Transformation ◽  
Image Data ◽  
Image Encoding ◽  
Fast Encoding ◽  
Classic Problem ◽  
Fractal Image ◽  
Fractal Image Coding ◽  
Image Data Compression

The classic problem of the existence of fractal coding time is too long, a kind of fast encoding algorithm was proposed in this paper, which is based on Wavelet and Fractal combined, using wavelet decomposition characteristics. This method reduces the amount of image data compression effectively, shorts coding time and improve the image encoding quality.

SECURE FRACTAL IMAGE CODING BASED ON FRACTAL PARAMETER ENCRYPTION

Fractals ◽  
2009 ◽  
Vol 17 (02) ◽  
pp. 149-160 ◽  
Author(s):  
SHIGUO LIAN ◽  
XI CHEN ◽  
DENGPAN YE
Keyword(s):  
Image Coding ◽  
Parameter Distribution ◽  
Self Similarity ◽  
Image Encoding ◽  
Coding Scheme ◽  
Fractal Image ◽  
Fractal Image Coding ◽  
Fractal Parameters ◽  
Fractal Encoding ◽  
Computational Resources

In recent work, various fractal image coding methods are reported, which adopt the self-similarity of images to compress the size of images. However, till now, no solutions for the security of fractal encoded images have been provided. In this paper, a secure fractal image coding scheme is proposed and evaluated, which encrypts some of the fractal parameters during fractal encoding, and thus, produces the encrypted and encoded image. The encrypted image can only be recovered by the correct key. To maintain security and efficiency, only the suitable parameters are selected and encrypted through investigating the properties of various fractal parameters, including parameter space, parameter distribution and parameter sensitivity. The encryption process does not change the file format, keeps secure in perception, and costs little time or computational resources. These properties make it suitable for secure image encoding or transmission.

An inequality for pairs of martingales and its application to fractal image coding

1996 ◽  
Vol 33 (04) ◽  
pp. 968-973
Author(s):  
F. M. Dekking
Keyword(s):  
Image Coding ◽  
Image Data ◽  
Monotonicity Property ◽  
Fractal Image ◽  
Fractal Image Coding

We prove a monotonicity property for a function of general square integrable pairs of martingales which is useful in fractal-based algorithms for compression of image data.

scholarly journals Password Authentication Based on Fractal Coding Scheme

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
Nadia M. G. Al-Saidi ◽  
Mohamad Rushdan Md. Said ◽  
Wan Ainun M. Othman
Keyword(s):  
Image Coding ◽  
Character Recognition ◽  
Optical Character Recognition ◽  
Communication Channel ◽  
Image Data ◽  
Database System ◽  
Password Authentication ◽  
Authorized User ◽  
Fractal Image ◽  
Fractal Image Coding

Password authentication is a mechanism used to authenticate user identity over insecure communication channel. In this paper, a new method to improve the security of password authentication is proposed. It is based on the compression capability of the fractal image coding to provide an authorized user a secure access to registration and login process. In the proposed scheme, a hashed password string is generated and encrypted to be captured together with the user identity using text to image mechanisms. The advantage of fractal image coding is to be used to securely send the compressed image data through a nonsecured communication channel to the server. The verification of client information with the database system is achieved in the server to authenticate the legal user. The encrypted hashed password in the decoded fractal image is recognized using optical character recognition. The authentication process is performed after a successful verification of the client identity by comparing the decrypted hashed password with those which was stored in the database system. The system is analyzed and discussed from the attacker’s viewpoint. A security comparison is performed to show that the proposed scheme provides an essential security requirement, while their efficiency makes it easier to be applied alone or in hybrid with other security methods. Computer simulation and statistical analysis are presented.

An inequality for pairs of martingales and its application to fractal image coding

1996 ◽  
Vol 33 (4) ◽  
pp. 968-973 ◽  
Author(s):  
F. M. Dekking
Keyword(s):  
Image Coding ◽  
Image Data ◽  
Monotonicity Property ◽  
Fractal Image ◽  
Fractal Image Coding

We prove a monotonicity property for a function of general square integrable pairs of martingales which is useful in fractal-based algorithms for compression of image data.

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