Resolution-enhanced three-dimensional image reconstruction by use of smart pixel mapping in computational integral imaging

Abstract

Computational integral imaging method can digitally provide a series of plane images of three-dimensional (3D) objects. However, the resolution of 3D reconstructed images is dramatically degraded as the distance from the lenslet array increases. In this paper, to overcome this problem, we propose a novel computational integral imaging reconstruction (CIIR) method based on smart pixel mapping (SPM). Since SPM is a computational process in which elemental images recorded at long distances are convertible to ones recorded near lenslet array, this can give us the improved resolution of plane images for 3D objects located at a long distance range from a lenslet array. For the effective use of the SPM-based CIIR method, we design a novel two-stage CIIR method by the combined use of the conventional CIIR and the SPM-based one. The conventional CIIR method is applied over a short distance range, while the SPM-based CIIR is used over a long distance range. We carry out some experiments to verify the performance of the two-stage CIIR system. From the experimental results, the proposed system can provide a substantial gain over a long distance range in terms of the resolution of reconstructed plane images.

Chaotic image encryption using pseudo-random masks and pixel mapping

“…2 shows the principle of the depth-converted EIA mapping method. The EIA depth-conversion method is also called the smart mapping algorithm [29,30]. This method is a computational depth-conversion process in which the original picked-up elemental images are converted to ones that would be obtained if they were recorded at a different pickup distance.…”

An integral imaging display using rectangular pinhole array

“…Integral imaging (II) display which presents true threedimensional (3D) images with full parallax and continuous viewpoints is regarded as a promising 3D display [1][2][3][4]. The II display has been implemented by use of a pinhole array or a micro-lens array.…”

Modified computational integral imaging-based double image encryption using fractional Fourier transform

“…Reconstruction of the double images is a reverse pickup process performed by propagating the lights emanating from the elemental images through a similar lenslet array. Reconstruction can be achieved with two methods: optical integral imaging reconstruction (OIIR) [13,14] and computational integral imaging reconstruction (CIIR) [15][16][17][18][19][20][21][22]. To improve the OIIR problems of having certain limitations such as quality degradation of reconstructed images caused by light diffraction and limited optical devices, the CIIR techniques were developed to increase the resolution of the reconstructed images.…”