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Protection of bio medical iris image using watermarking and cryptography with WPT
محافظت از تصویر عنبیه بیولوژیکی پزشکی با استفاده از علامت گذاری و رمزنگاری با WPT-2019 The emerging technologies in this present world is real time biometrics which recognized a specific person
in a reliable manner through their distinct biological features. The most reliable biometric identification
is an iris identification. The collection of iris images can be stored in the database which is hacked by
the intruders. In order to prevent these databases with watermark text, a novel hybrid method is proposed
which is a combination of Wavelet Packet Transform (WPT) and cryptography. This paper presents
WPT for segmenting the iris image and finding the minimum energy band where the watermark text is
embedded. The watermark text is the personal information of the owner of iris. Once the watermarking is
done, the cryptographic key is used to encrypt the watermarked image. This way, both the image and the
watermark text are prevented in an efficient manner. The quality measures of watermarked image have
been analyzed and compared with other existing techniques. The proposed technique has been analyzed
with blurring, salt and pepper, JPEG, cropping, Gaussian noise, rotate, speckle noise, filter, gamma, intensity
and histogram equalization noises having PSNR value increased by 3.3%, 3.6%, 4.1%, 5.3%, 7.7%, 6.1%,
11.9%, 7.7%, 14.4%, 10.7% and 10.2% respectively which effectively increased the quality of image. Keywords: Wavelet Packet Transform (WPT) | Watermarking | Cryptography | Peak Signal to Noise Ratio (PSNR) | Mean Square Error (MSE) | Normalized Cross Correlation (NCC) |
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