Printing the holographic stereogram (HS) is vulnerable to the vibration when the holographic film is exposed to the continuous wave laser beam compared to the pulsed laser. The continuous wave laser is required to be more longer exposed to the holographic film for forming the fringe pattern, hence the optical system is normally set up on the antivibration system such as optical table which could be a latent defect considering the commercially available printer. This paper covers the design of holographic stereogram printing system which is built upon the non-vibration environment where the ambient noises exist. In order to build a robust system under the common sources of vibration, we designed the optical system which can minimize the effects of ambient noise as well as reduce the optical vibrations. The main source of the noise comes from the stage that transfers the hologram plate hogel by hogel. In order to accelerate the film transportation, we devised and applied an anti-vibration algorithm which can reduce the vibration significantly and the open frame architecture as well. The holographic stereogram printing is conducted using the one-step full parallax stereograms which are generated by setting up the re-centered camera. The optical system features single signal beam converging module to minimize the optical components and tailored optical components. An open frame film stage is integrated into the HS system. For the experiments, the horizontal and full parallax 1mmx1mm, 50x50 and 100x100 hogels are printed to verify the proposed HS printing system.
3D video content is captured and created mainly in high resolution targeting big cinema or home TV screens. For 3D
mobile devices, equipped with small-size auto-stereoscopic displays, such content has to be properly repurposed,
preferably in real-time. The repurposing requires not only spatial resizing but also properly maintaining the output stereo
disparity, as it should deliver realistic, pleasant and harmless 3D perception.
In this paper, we propose an approach to adapt the disparity range of the source video to the comfort disparity zone of
the target display. To achieve this, we adapt the scale and the aspect ratio of the source video. We aim at maximizing the
disparity range of the retargeted content within the comfort zone, and minimizing the letterboxing of the cropped
The proposed algorithm consists of five stages. First, we analyse the display profile, which characterises what 3D
content can be comfortably observed in the target display. Then, we perform fast disparity analysis of the input
stereoscopic content. Instead of returning the dense disparity map, it returns an estimate of the disparity statistics (min,
max, meanand variance) per frame. Additionally, we detect scene cuts, where sharp transitions in disparities occur.
Based on the estimated input, and desired output disparity ranges, we derive the optimal cropping parameters and scale
of the cropping window, which would yield the targeted disparity range and minimize the area of cropped and
letterboxed content. Once the rescaling and cropping parameters are known, we perform resampling procedure using
spline-based and perceptually optimized resampling (anti-aliasing) kernels, which have also a very efficient
computational structure. Perceptual optimization is achieved through adjusting the cut-off frequency of the anti-aliasing
filter with the throughput of the target display.
This paper presents a study on the stereoscopic 3D codec for non-real-time 3DTV services. Delivering stereoscopic
3DTV contents via broadcast networks can be based on either real-time or non-real-time scenarios. For a digital
television system where its bandwidth is somewhat limited to accommodate the full 3D HD quality video, a
complementary enabler is the non-real-time delivery in which 3D video component is downloaded in advance. In the
case of ATSC system, MPEG-2, H.264/AVC and any other codec can be used for stereoscopic video based on Non-
Real-Time services. In order to put in the best performance, the analysis on the stereoscopic codec, scenarios and
preliminary considerations are required. In this paper, the NRT 3D codec scenarios and preliminary considerations are
addressed to develop the prerequisites required for the analysis on NRT 3D codec. The experimentation of both
independent and inter-view coding are covered to investigate the codec combination for NRT 3D video services based on
considerations and scenarios.
The mobile broadcasting services getting deployed around the world are being evolved to new services. One of the
notable services is mobile stereoscopic service, called 3D, which can provide users with a stereoscopic view of TV
contents while on the move. This paper presents the design and the implementation of 3D DMB receiver enabling the
reception of mobile 3DTV and BIFS based interactive data services. Main concepts of 3D DMB receiver are the nonglasses
viewing experience, backward and forward compatibility and high transmission efficiency. We demonstrate the
main concepts and features of our 3D DMB receiver and outline the implementation result along with the future works.
This paper presents a stereoscopic contents authoring system that covers the creation and editing of stereoscopic
multimedia contents for the 3D DMB (Digital Multimedia Broadcasting) data services. The main concept of 3D DMB
data service is that, instead of full 3D video, partial stereoscopic objects (stereoscopic JPEG, PNG and MNG) are
stereoscopically displayed on the 2D background video plane. In order to provide stereoscopic objects, we design and
implement a 3D DMB content authoring system which provides the convenient and straightforward contents creation
and editing functionalities. For the creation of stereoscopic contents, we mainly focused on two methods: CG (Computer
Graphics) based creation and real image based creation. In the CG based creation scenario where the generated CG data
from the conventional MAYA or 3DS MAX tool is rendered to generate the stereoscopic images by applying the suitable
disparity and camera parameters, we use X-file for the direct conversion to stereoscopic objects, so called 3D DMB
objects. In the case of real image based creation, the chroma-key method is applied to real video sequences to acquire the
alpha-mapped images which are in turn directly converted to stereoscopic objects. The stereoscopic content editing
module includes the timeline editor for both the stereoscopic video and stereoscopic objects. For the verification of
created stereoscopic contents, we implemented the content verification module to verify and modify the contents by
adjusting the disparity. The proposed system will leverage the power of stereoscopic contents creation for mobile 3D
data service especially targeted for T-DMB with the capabilities of CG and real image based contents creation, timeline
editing and content verification.
This paper presents a 3D (three dimensional) mobile broadcasting service based on depth-image-based rendering (DIBR)
technique in terrestrial digital multimedia broadcasting (T-DMB). In designing and developing a 3D visual service based
on mobile broadcasting system, we must consider system requirements such as the minimization of additional bit-rates
for 3D depth information due to the limitation of transmission channel bandwidth, the assurance of backward
compatibility with existing T-DMB, and the maximization of 3D effect while reducing eye fatigue. Therefore, the 3D
mobile broadcasting service based on DIBR technique can be one of the solutions to meet such requirements because the
allocated bit-rates of depth image with DIBR scheme is less than additional video bit-rates of another 3D format, while
keeping 3D quality and guaranteeing backward-compatibility with T-DMB. In this paper, we introduce an
implementation of DIBR-based 3D T-DMB system that supports the real-time rendering with good image quality and
depth effect at the receiver, verifying that it could be available in the mobile broadcasting. The verification is achieved
through objective and subjective evaluation, based on the simulation and implementation of the system. Finally, we will
confirm that DIBR-based 3D mobile broadcasting service would be commercialized in near future.
We propose an advanced time synchronization scheme with additional pre-processor for OFDM systems. The proposed pre-processor scheme makes symbol synchronization and guard-interval length detection possible, even though there is no guard-interval length information. This pre-processor is so useful in the systems like DVB-T, which have several kinds of guard-interval lengths. Simulation results show that the proposed scheme gives satisfactory performance in the guard-interval length detection and the OFDM symbol synchronization over AWGN.