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The increasing availability of point cloud data in recent years is demanding for high performance denoising methods and compression schemes. When point cloud data is directly obtained from depth sensors or extracted from images acquired from different viewpoints, imprecisions on the depth acquisition or in the 3D reconstruction techniques result in noisy point clouds which may include a significant...
Light-field (LF) is foreseen as an enabler for the next generation of 3D/AR/VR experiences. However, lack of unified representation, storage and processing formats, variant LF acquisition systems and capture-specific LF processing algorithms prevent cross-platform approaches and constrain the advancement and standardization process of the LF information. In this work we present our vision for camera-agnostic...
As the technology of capturing light fields evolves, depth estimation from light field images has become a hot issue in recent years. Nevertheless, how to avoid the estimation error caused by multi-occlusion is still an open-ended problem. In this paper, we present a novel method to handle complex occlusions in depth estimation of light fields. Firstly, we propose a new theory, when a pixel is around...
This paper describes a novel light field compression scheme using a depth image-based view synthesis technique. A small subset of views is compressed with HEVC inter coding and then used to reconstruct the entire light field. The residual of the whole light field can be then restructured as a video sequence and encoded by HEVC inter coding. Experiments show that our scheme significantly outperforms...
Multi-Intensity Illuminated Infrared (MIIR) video is a new type of infrared video which solves the problem of improper illumination conditions for ordinary infrared cameras for nighttime surveillance. However, its time-varying intensity makes it hard to be compressed with traditional video coding methods. In this paper we use MV-HEVC and 3D-HEVC video coding standards, which are originally designed...
This paper addresses the problem of joint source and channel coding for 3-D video coding and transmission. Firstly, we formulate a packet-level joint texture and depth coding mode selection framework for error-resilient source coding using Lagrange multiplier. Then, we evolve to the more general formulation that jointly optimizes error-resilient source coding and channel coding for texture and depth...
We propose an efficient method for reconstructing background fragments that are visible in at least one frame of the input video sequence; this method can aid in filling disoccluded areas during view synthesis. We make no assumptions regarding background or camera motion except that it is smooth. The proposed method can therefore handle a wide variety of scenes captured with a free-moving camera....
In this paper, geometric optical models are proposed that can accurately estimate the distances of object planes in a light field image. Treating an arbitrary point on an object plane as an off-axis point light source, the single-point-light-source model, which consists of two relaying models, is established to describe the propagation of light rays from the off-axis point light sources to the image...
In a free viewpoint video (FVV) system, a user has a freedom to choose a view angle arbitrarily. To facilitate view synthesis, we need to interpolate a number of adjacent views by exploiting spatial and temporal redundancy among them. Existing synthesizing techniques may concern poor rendering quality due to the occluded background areas and rounding integer error through warping. Currently, inpainting...
Interpolating virtual views from sparse visual content increases the angular resolution of the visualization. However, such techniques may degrade the image quality through inaccurate view estimation. The smooth motion parallax through increased angular resolution, and image quality are essential components of the overall user experience. The choice of interpolation initiates an unclear trade-off...
The quality assessment of stereoscopic images is playing a critical role in 3D multimedia applications. The 3D image quality evaluation encounters many challenges and simple extension of the 2D quality metrics to the 3D case is not satisfying. In this work, we propose a new perceptual quality assessment scheme for stereoscopic 3D images by considering the human visual characteristics. After the log-Gabor...
In a remote rendering system, the display device and the main graphics processing unit (GPU) are located in different places, which is a kind of client-server architecture and is widely used in cloud gaming and virtual reality (VR). To reduce the interaction delay and improve the user experience especially when the link between the server and client becomes wireless, we propose a client-end GPU-accelerated...
Automatic prediction of salient regions in images is a well developed topic in the field of computer vision. Yet, virtual reality omnidirectional visual content brings new challenges to this topic, due to a different representation of visual information and additional degrees of freedom available to viewers. Having a model for visual attention is important to continue research in this direction. In...
With the recent explosive growth of Augmented Reality (AR) and Virtual Reality (VR) platforms, technology to capture and render dynamic physical space has increasingly become indispensable. In this paper, we present a novel system that can capture and render in real-time dynamic 3D scenes on a virtual arbitrarily-shaped curved mirror. To achieve a realistic mirror rendering, the reflective scenes...
This paper proposes an edge-consistency based frame rate up conversion (FRUC) method for stereoscopic video with limited bandwidth. Firstly, we classify the edge blocks and the flat blocks, respectively, by considering the correlation between the texture image and the depth map. Then, by applying the classification information to motion estimation (ME) and motion vector (MV) post-processing, we obtain...
Dense views are needed urgently for autostereoscopic three-dimensional (3D) displays. A dense view synthetization system with three input views which are captured by a three-camera rig is presented. In the system, an image preprocessing step is presented before rendering dense views, in which both color and depth images are optimized by the proposed adaptive joint view optimization algorithm. Then...
To estimate heart rate (HR) during night remotely and unobtrusively, we use a far-infrared camera and an RGB-Infrared camera to develop a dual-mode imaging system. The RGB or infrared images are first registered by the far-infrared images through the affine transformation. A custom-made cascade face classifier, which contains the conventional Adaboost model and fully convolutional network, was applied...
The targeted use of Information and Communication Technologies (ICT) can provide a very effective holistic platform for the delivery of eHealth services. Through the integration of communication information delivery mediums such as SMS\MMS coupled with the web and\or native mobile applications information technologies, eHealth services can be extended and readily adapted to mobile devices giving rise...
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