Comput Methods Programs Biomed - A joint encryption/watermarking algorithm for verifying the reliability of medical images: application to echographic images.

Tópicos

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Resumo

In this paper we propose a joint encryption/watermarking algorithm for the purpose of protecting medical images. The proposed solution gives access to the outcomes of the image integrity and of its origins as its attachment to one patient even if the image is stored encrypted. In this study, the given solution combines the RC4 stream cipher and two substitutive watermarking modulations: the Least Significant Bit Method and the Quantization Index Modulation. If watermarking and encryption are conducted jointly at the protection stage, watermark extraction and decryption can be applied independently. Experimental results achieved on 8 bits encoded echographic images illustrate the overall performances of the proposed scheme. At least, a capacity rate of 1 and 0.5 bits of message per pixel of image can be embedded in the spatial and the encrypted domains respectively, with a peak signal to noise ratio greater than 49 dB.

Resumo Limpo

paper propos joint encryptionwatermark algorithm purpos protect medic imag propos solut give access outcom imag integr origin attach one patient even imag store encrypt studi given solut combin rc stream cipher two substitut watermark modul least signific bit method quantiz index modul watermark encrypt conduct joint protect stage watermark extract decrypt can appli independ experiment result achiev bit encod echograph imag illustr overal perform propos scheme least capac rate bit messag per pixel imag can embed spatial encrypt domain respect peak signal nois ratio greater db

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