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In computer vision-based Intelligent Transportation Systems (ITS), one of the key techniques is to exactly detect the vehicles. The common way for vehicle detection is the background difference method. In this paper, we introduce several background extraction and updating methods and develop a new background extraction and update method based on histogram in YCbCr color space. By using YCbCr color...
We present a multi-view 3D video acquisition and its processing system for multi-view 3D television (3DTV). The proposed hybrid camera system consists of three-color cameras and one time of flight (TOF) camera. Since currently available TOF cameras do not provide color images associated with the depth image, we use a beam splitter between the color camera of the center view and the TOF camera to minimize...
Generating in-between images from multiple views of a scene is a crucial task for both computer vision and computer graphics fields. Photorealistic rendering, 3DTV and robot navigation are some of many applications which benefit from arbitrary view synthesis, if it is achieved in real-time. GPUs excel in achieving high computation power by processing arrays of data in parallel, which make them ideal...
We propose an effective virtual view synthesis approach, which utilizes the technology of depth-image-based rendering (DIBR). In our scheme, two reference color images and their associated depth maps are used to generate the arbitrary virtual viewpoint. Firstly, the main and auxiliary viewpoint images are warped to the virtual viewpoint. After that, the cracks and error points are removed to enhance...
The quality of depth maps is crucial for 2D to 3D conversion, but high quality depth map generation methods are usually very time consuming. We propose an efficient semi-automatic depth map generation scheme based on limited user inputs and depth propagation. First, the original image is over-segmented. Then, the depth values of selected pixels and the approximate locations of T-junctions are specified...
Virtual view synthesis has been considered as a crucial technique in three-dimensional television (3DTV) display, where depth-image-based rendering (DIBR) is a key technology. In order to improve the virtual image quality, a method without preprocessing the depth image is proposed. During the synthesis, the hole-flag map is fully utilized. A Horizontal, Vertical and Diagonal Extrapolation (HVDE) using...
Subtractive crosstalk cancelation is an effective way to reduce the appearance of ghosting in 3D displays. However, effective cancelation requires the black level of the input images to be raised above zero, which reduces the image contrast and visual quality. Previous methods for selecting the raised black level do not consider the image content; they are either based on the worst case or they do...
For natural image segmentation, due to features from a single image are hard to describe the complex scene information, this paper presents a new method based on the fusion model evaluation index PRI to fuse color histogram features in 3 color spaces, RGB, XYZ, LUV, and texture features. We experiment on images from Berkeley segmentation databases and compare the quantitative and qualitative experimental...
According to the features of the changing color of fire flames, the periodically increasing of area and the irregular changing in the shape of fire when the early fire breaks, we take fire flame as a kind of special moving object and make a research of it. The color characteristics in fire video images as well as the morphological changes are discussed in this paper, a comprehensive analysis of all...
We introduce a scheme for the production of LDV (Layered Depth Video) content, based on capturing from a hybrid camera system, consisting of two time of flight and five CCD cameras and introduce a post production step, based on Grab - Cut segmentation, which significantly improves the quality of the end result. The proposed improvement step can be done fully automatically, based on initialization...
We propose a method of filtering depth maps provided by Kinect depth camera. Filter uses output of the conventional Kinect camera along with the depth sensor to improve the temporal stability of the depth map and fill occlusion areas. To filter input depth map, the algorithm uses the information about motion and color of objects from the video. The proposed method can be applied as a preprocessing...
The interest in the production of stereoscopic contents is growing rapidly. High quality stereo material can be produced using vertical stereo camera rig but complex color discrepancies occur because of the optical characteristic of the half mirror. These discrepancies may severely increase an audience's sense of fatigue if s/he watches these stereoscopic contents for a long time. The color matching...
Multiview 3D videos can efficiently be represented using a mixed resolution multiview 3D video format that has a number of color and depth information with different resolutions. However, such a mixed resolution multiview video format would have a shortcoming on synthesizing virtual views between a low and a high resolution view. This paper provides an approach to synthesize virtual image from multi-view...
The present work analyses a layered depth-image-based-rendering algorithm based on possible errors occurring with perspective 3D warping. The outcome is improvements to the algorithm that treats depth reliably for scenes containing several levels of foreground objects. The filling of holes of different kinds is addressed so that results have better visual quality. The analysis compares the results...
We propose a novel 2D to 3D scheme by considering perceived 3D experience caused by occlusion and visual attention. In this scheme, initial depth model, the saliency map of visual attention and occlusion analysis are integrated in depth calculation. Mean-while, characteristics of human visual system are also considered as weight factors. Then, depth normalization and refining are implemented. The...
In this paper an algorithm which is able to count the number of fingers from a hand posture is presented. The method is based on hand contour and skin colour information. The middle axes of the fingers are detected. The method is robust regard the hand edge detection.
We present a new method for fully automated video matting. This method uses depth information acquired by a depth camera to automatically compute trimaps. Trimaps segment an image into three nonoverlapping regions (foreground, background, and unknown) and generation of a highly accurate trimap is one of the most important tasks in natural alpha matting. We propose an adaptive approach to generate...
In 3DTV and free viewpoint imaging systems based on a view-plus-depth representation, depth compression is important for high-quality view synthesis. Several publications have proposed depth down-/up-sampling as part of the depth coding strategy. Recently, we proposed a depth up-sampling method which uses the high resolution view in the process of depth up-sampling. Actually, in 2007 Kopf et.al. already...
In this paper, a new watermark retrieval method is proposed to be used in the digital watermarking based on the modification of image pixels in order to improve the accuracy of the retrieval watermark and simultaneously enhance the robustness of the embedded watermark. Conceptually, different color spaces usually display different discriminating energy. The watermark embedded in blue component of...
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