Abstract
We propose a two-step integral imaging coding based three-dimensional (3D) information encryption approach in this paper. In this approach, a synthetic aperture integral imaging system is applied to acquire a set of parallax images including spatial and angular information of 3D scene. In the encryption process, two-step coding is performed. In the first step, the acquired parallax images are encrypted firstly by double random-phase coding in the Fresnel domain. In the second step, these encrypted parallax images are encoded into a cipher image by mapping algorithm which is used to generate elemental image array of integral imaging. In the decryption process, an inverse operation is performed. The experimental results demonstrate the feasibility, security, and robustness of the proposed approach.
Highlights
For the past decade, the autostereoscopic techniques without any auxiliary devices have gained more attention
II pickup process can be implemented by using a camera array which can capture a larger field of view and high-resolution parallax images [8]
A synthetic aperture integral imaging (SAII) system in which a single camera shifts on a 2D plane to capture different perspective information can take the place of the camera array to reduce cost and the complexity of devices [9]
Summary
The autostereoscopic techniques without any auxiliary devices have gained more attention. The conventional II system inserts a microlens array in front of the image sensor to capture multiple images of a 3D scene from different perspectives [3, 5]. We propose a two-step coding 3D information encryption approach which is applied to real 3D scene based on an SAII system and double random-phase encoding (DRPE) in Fresnel domain, which improves further security and robustness. The experimental results verify the security and robustness of the proposed encryption approach, and the 3D information can be reconstructed flexibly by OIIR and CIIR according to II system configuration
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