Abstract
In this work, the occlusion and noise test on the encrypted image produced by a joint transform correlator-based encryption system in the Fresnel domain (FrD) are computed and presented, in order to check the performance of this security system with respect to the image quality resulting in the decryption process for the retrieved image. The encryption system based on a joint transform correlator (JTC) in the FrD was proposed by us, with the purpose of using a lensless optical setup. We test the performance of this security system when the encrypted image is affected by common sources of degradation such as noise (additive and multiplicative) or partial occlusion. Finally, we evaluate the performance and robustness of the security system in the FrD by using the metric of the root mean square error (RMSE) between the image to encrypt and the decrypted image when the encrypted image is degraded by noise or modified by occlusion.
Highlights
An important technique for optical encryption is the double random phase encoding (DRPE) [1], this technique uses two random phase masks (RPMs) to encode the original image into an encrypted image
The occlusion and noise test on the encrypted image produced by a joint transform correlator-based encryption system in the Fresnel domain (FrD) are computed and presented, in order to check the performance of this security system with respect to the image quality resulting in the decryption process for the retrieved image
The DRPE has been further extended from the Fourier domain to the Fresnel domain (FrD) [2,3,4,5,6] and the fractional Fourier domain [7,8,9,10], in order to increase the number of keys and to improve the security of the encryption-decryption system
Summary
An important technique for optical encryption is the double random phase encoding (DRPE) [1], this technique uses two random phase masks (RPMs) to encode the original image into an encrypted image (stationary white noise pattern). The occlusion and noise test on the encrypted image produced by a joint transform correlator-based encryption system in the Fresnel domain (FrD) are computed and presented, in order to check the performance of this security system with respect to the image quality resulting in the decryption process for the retrieved image.
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