Reversible data embedding theory has marked a new epoch for hiding and information security. Being reversible, the original embedded should be completely restored. Difference expansion transform is remarkable breakthrough in reversible data-hiding schemes. The difference method achieves high capacity keeps distortion low. This paper shows that with simplified location map expandability can achieve more while keeping at same level as method. Performance of proposed scheme this shown to better...

We demonstrate a tabletop holographic display system for simultaneously serving continuous parallax 3.2-inch 360-degree three-dimensional image content to multiple observers at 45-degree oblique viewing circumference. To achieve this, localized windows are be seamlessly generated on the In proposed system, four synchronized high-speed digital micro-mirror displays optically configured comprise single 2 by multi-vision panel that enables size enlargement and time-division-multiplexing of...

In this paper, we investigate a learning-based complex field recovery technique of an object from its digital hologram. Most the previous approaches first propagate captured hologram to plane and then suppress DC conjugate noise in reconstruction. To contrary, proposed utilizes deep learning network extract directly, making it robust depth variations well suited for three-dimensional objects. Unlike which concentrate on transparent biological samples having near-uniform amplitude, is applied...

We present Fourier rainbow holographic imaging approach. It involves standard laser recording and novel horizontal parallax only display. In the display, effect is introduced in an illumination module by high-frequency diffraction grating white light LED source. The display addressed digital hologram (FRDH) encoding defocused object field with removed spatial frequency components one direction slitting without spherical phase factor. Theoretically experimentally it shown that method extends...

Recently, the tabletop holographic display has been introduced to present a large 3D hologram floating over table. When observer looks down at hologram, reconstructs upper perspectives of object 45° angle. This paper presents full imaging chain for based on capture, processing, and reconstruction 360° observable real object. Two different methods, which involve lensless Fourier digital recordings display, are introduced. The first method utilizes conventional capture approach with side view...

Conventional video coding methods have been developed based on the human visual system (HVS). However, in recent years, has occupied a huge portion of internet traffic, and mount data for machine consumption increased rapidly due to progress neural networks. This paper proposes novel machine-attention-based method machines. Inspired by saliency-driven research, we first extract attention regions, sensitively affecting vision performance, from object detection network. Subsequently, maximum...

This paper proposes a conditional replenishment algorithm (CRA) to improve the visual quality (where spatial resolutions of left and right views are mismatched) hybrid stereoscopic 3DTV that is based on ATSC-M/H standard. So as generate an enhanced view, CRA choose better substitute among disparity-compensated view with high simply interpolated view. The generates disparity map includes modes vectors additional information. It also employs quad-tree structure variable block size by...

Most of previous implementations electroholographic display cannot fulfill the expectations for floating 3-diemsional image in air, which is easily viewable by multiple users at same time and from all directions around image. We implemented a table-top style 360 degree viewing solid looking, color 3D movies, air.

The optical phenomena arising in the process of forming reconstructed images a hologram are explained and shown visually with use light field images. fields at different distances from on DMD reveal that image each object point is formed by corresponding Fresnel zone pattern, which when it illuminated reconstruction laser beam. circle least confusion laden noise distortion. It has finite size does not appear distance due to presence aberrations, especially strong astigmatism. astigmatism...

Surface reconstruction for micro-samples with large discontinuities using digital holography is a challenge. To overcome this problem, multi-incidence holographic profilometry (MIDHP) has been proposed. MIDHP relies on the numerical generation of longitudinal scanning function (LSF) reconstructing topography sample depth and high axial resolution. Nevertheless, method unable to reconstruct surfaces gradients due need of: (i) precision focusing that manual adjustment cannot fulfill (ii)...

This paper describes experimental demonstration of holographic 3D reconstructions with a directly-viewing, transmissive, amplitude-modulating 5.5″ LCD SLM device in monochrome. A full-complex field modulation is achieved by the single amplitude-modulation module using Burckhardt-encoding scheme at cost decrease sampling. We define an effective contrast ratio for first time this work. further report that from Burckhardt-encoded hologram superior to one conventional amplitude-only encoded hologram.

A panoptic segmentation network to predict masks and classes for things stuff in images is proposed this work. Recently, has been advanced through the combination of query-based learning end-to-end approaches. Current research focuses on queries without distinguishing between thing classes. We present decoupling query generate effective segmentation. For purpose, we adopt different workflows queries. design center-guided selection queries, which center regions individual instances images,...

In a digital hologram, the maximum viewing angle of computer-generated hologram (CGH) is limited by pixel pitch due to diffraction grating equation. Since reducing size display panel challenging and costly, we propose method expand attaching an aligned pixelated random phase mask (PRPM) onto CGH pattern based on analysis simulation results. By introducing phase-averaging process widely used iterative Fourier transform algorithm, optimized can be obtained in conjunction with PRPM. Based...

In this paper, we propose a hybrid approach for accurate depth acquisition by using structured light-based method with stereo matching. By projecting additional light patterns onto scene, works well on textureless region where matching shows poor performance. contrast, the projected rich textured obstruct in estimating reliable information method, while excels. We exploit these complementary characteristics combining results from both methods that outperform one either alone. our fusion...

A holographic display based on a viewing window enables the converging of reconstruction wave into by means an optical system. Accordingly, user can observe reconstructed hologram image, even with small diffraction angle. It is very difficult to manufacture system no aberrations; thus, it inevitable that certain amount aberrations will exist. viewing-window-based display, therefore, always includes distortions in image from pattern. Compensating important technical issue because dramatically...

In the paper we investigate hologram binarization method through time multiplexing based on histogram. proposed approach input object is divided into N components with equal total intensity distributions. Next, propagation and procedure employed for each component separately. Presented matched to DMD application since it modulates light simply by reflection. computer simulations quality of reconstructed holograms compared that threshold different reconstruction distances. Additionally,...

Holography is a three-dimensional (3D) imaging technique to reconstruct wave field of the light scattered by real objects. In this paper, we present two representative digital holographic data representations, 3D data-based representation and hologram-based representation, compare compression efficiency them.

In this paper, a depth and texture imaging method using time-varying color structured lights is introduced. Three patterns are periodically projected on scene captured with our system to produce images simultaneously. The difference between three used identify the pattern's color, image can be simultaneously obtained by adding colors of patterned images. experimental results show that proposed suitable for static slow moving objects.

We propose an automatic three-dimensional (3D) pupil tracking backlight system for holographic 3D display with large image size and full-parallax accommodation effect.The proposed module is applied to a two sets of directional imaging composed 2×2 scale lens array 22-inch high-resolution liquid crystal panel.System architecture described experimental results are presented.

CNN-based absolute camera pose estimation methods lack scene generalizability as the network is trained with scene-specific parameters. In this paper, we aim to solve problem in 6-DoF using a novel deep photo-geometric loss. We train relative end-to-end, by jointly optimizing proposed loss along regression Most traditional use local keypoints find 2D-2D correspondences, which fails under occlusion, textureless surfaces, motion blur, or repetitive structures. Given intrinsics, poses and...

In this work, we proposed what believe to be a novel scanning solution for the assessment of high-NA samples, referred as spherical-wave illumination digital holographic profilometry (SWS-DHP). This approach introduces 2F optimization methodology, based on measurement focal length object determine spherical component scanning. Furthermore, re-optimization 2F, whether it needs operated depends measured object's NA inspect more information. Meanwhile, utilizing phase space analysis shows SWS...

A novel measurement method named multi-angle spherical-wave scanning digital holographic profilometry (MISDHP) for acquiring the surface of high gradient objects beyond NA setup is proposed.

Abstract A conventional codec aims to increase the compression efficiency for transmission and storage while maintaining video quality. However, as number of platforms using machine vision rapidly increases, a that increases maintains accuracy tasks must be devised. Hence, Moving Picture Experts Group created standardization process coding machines (VCM) reduce bitrates tasks. In particular, in‐loop filters have been developed improving subjective quality task accuracy. high computational...