Volume : VII, Issue : IX, September - 2018

ENCRYPTED IMAGE RECONSTRUCTION BY DECODING THE BITSTREAM

Mohitha M Rao

Abstract :

In this paper, we propose anovel scheme of scalable coding for encrypted images. In the encryption phase, the original pixel values are masked by a modulo–256 addition with pseudorandom numbers that are derived from a secret key. After decomposing the encrypted data into a down–sampled sub image and several data sets with a multiple–resolution construction, an encoder quantizes the sub image and the hadamard coefficients of each data set to reduce the data amount. Then, the data of quantized sub image and coefficients are regarded as a set of bit streams. At the receiver side, while a sub image is decrypted to provide the rough information of the original content, the quantized coefficients can be used to reconstruct the detailed content with an iteratively updating procedure. Because of the hierarchical coding mechanism, the principal original content with higher resolution can be reconstructed when more bit streams are received. The image quality is analyzed by compå the decrypted image with the original image by using statistical parameters such as peak–signal–to–noise–ratio (PSNR) and mean square error (MSE).

 

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Article: Download PDF   DOI : 10.36106/ijsr  

Cite This Article:

Mohitha M Rao, ENCRYPTED IMAGE RECONSTRUCTION BY DECODING THE BITSTREAM, INTERNATIONAL JOURNAL OF SCIENTIFIC RESEARCH : Volume-7 | Issue-9 | September-2018

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