A new approach for the speed up of fractal image coding

2002 ◽  
Author(s):  
B. Rejeb ◽  
W. Anheier
Keyword(s):  
Image Coding ◽  
New Approach ◽  
Fractal Image ◽  
Fractal Image Coding ◽  
Speed Up

scholarly journals A New Approach in Cryptographic Systems Using Fractal Image Coding

2009 ◽  
Vol 5 (3) ◽  
pp. 183-189 ◽  
Author(s):  
Nadia M.G. Al-Saidi ◽  
Muhammad Rushdan Md. Said
Keyword(s):  
Image Coding ◽  
New Approach ◽  
Fractal Image ◽  
Fractal Image Coding

scholarly journals Fractal Image Coding Based on a Fitting Surface

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Sheng Bi ◽  
Qiang Wang
Keyword(s):  
Image Coding ◽  
Block Matching ◽  
Superior Performance ◽  
Gray Level ◽  
Fractal Image ◽  
Fractal Image Coding ◽  
Coding Method ◽  
Surface Image ◽  
Speed Up ◽  
Better Than

A no-search fractal image coding method based on a fitting surface is proposed. In our research, an improved gray-level transform with a fitting surface is introduced. One advantage of this method is that the fitting surface is used for both the range and domain blocks and one set of parameters can be saved. Another advantage is that the fitting surface can approximate the range and domain blocks better than the previous fitting planes; this can result in smaller block matching errors and better decoded image quality. Since the no-search and quadtree techniques are adopted, smaller matching errors also imply less number of blocks matching which results in a faster encoding process. Moreover, by combining all the fitting surfaces, a fitting surface image (FSI) is also proposed to speed up the fractal decoding. Experiments show that our proposed method can yield superior performance over the other three methods. Relative to range-averaged image, FSI can provide faster fractal decoding process. Finally, by combining the proposed fractal coding method with JPEG, a hybrid coding method is designed which can provide higher PSNR than JPEG while maintaining the same Bpp.

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.

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