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Construction of an embedded position measurement sensor based on the real-time image processing and a low-cost CMOS image sensor is presented in this work. Position measurement task is simplified with the use of assisted videometry concept — the target object is equipped with an additional marker (active or passive). An effective implementation of algorithm for the marker position estimation for Digital...
A fast algorithm that approximately estimates the circularity of a digital object is proposed. The algorithm is shown to be capable of incorporating the existing empirical measures of circularity, which are mostly based on area and perimeter computation. The minimum-area orthogonal cover of the object is obtained by a fast combinatorial technique that simultaneously provides approximate measures of...
Visual stabilization proposed in this paper compensates changes of the scene caused by motion and deformation of an observed object. This is of high importance in computer-assisted beating heart surgery, where the views of the beating heart should be stabilized. The proposed model-based method defines visual stabilization as a transformation of the current image sequence to a stabilized image sequence...
A methodology for the context-aided-tracking of ground vehicles in remote airborne imagery is presented in which a background model is inferred from hyperspectral imagery. The functional materials in a scene are determined and become a background model. Here, a manual method of forming the model is presented, as well as a novel autonomous method which exploits the emerging class of adaptive multiple-object-spectrometer...
Combined with the gradient similar measure, this paper proposes a new algorithm to register the images based on registration operator. By using the bilinear interpolation to express the relationship between the image to be registered and the reference image, the method transfers the registration problem to parameter estimation. And on the basis of the revised gradient similar measure, we construct...
This paper presents the challenging issue of target detecting and pose estimation in Forward Looking Infrared (FLIR) sequences. Target detecting and pose estimation are formulated as one process. Specifically, a new mixture of Gaussians model is proposed to detect target appearances. A probability based method is used to estimate the target position and size, where the detected appearance plays an...
New method improving B-slice prediction is proposed. By combining the optical flow concept and high accuracy gradients evaluation we construct the algorithm which allows pixel-wise refinement of motion. This approach does not require any signaling for decoder. According to tests with WQVGA sequences bit-saving of 2%-6% can be achieved using this tool.
Currently, depth sequences generated by automatic depth estimation suffer from the temporal inconsistency problem. Estimated depth values of some objects vary in adjacent frames, whereas the objects actually remain on the same depth planes. These temporal depth errors significantly impair the visual quality of the synthesized virtual view as well as the coding efficiency of the depth sequences. Since...
In this paper, we propose a fast graph cut (GC) algorithm for disparity estimation. Two accelerating techniques are suggested: one is the early termination rule, and the other is prioritizing the α-β swap pair search order. Our simulations show that the proposed fast GC algorithm outperforms the original GC scheme by 210% in the average computation time while its disparity estimation quality is almost...
Many existing multi-view video coding techniques remove inter-viewpoint redundancy by applying disparity compensation in conventional video coding frameworks, e.g., H264/MPEG4. However, conventional methodology works ineffectively as they ignore the special features of the inter-view-point disparity. This paper proposes a framework using virtual plane (VP) for multi-view image compression, such that...
This paper proposes a novel algorithm for simultaneous estimation of the bias field and segmentation of tissues for magnetic resonance images. The algorithm formulated by modifying the objective function in the fuzzy C-means algorithm to include a bias field which is modeled as a linear combination of a set of basis functions. Bias field estimation and image segmentation are simultaneously achieved...
In this paper, under the non-local means framework, we propose a non-local bilateral filter algorithm for image denoising based on the neighborhoods' gray value and the corresponding neighborhoods' Gaussian curvature. We also adopt a new method to provide the optimum denoising parameter h based on the discrete wavelet transform and the smoothing spline estimation. Meanwhile the generalized cross-validation...
During the image acquisition and communication the image is corrupted by noise. This is a classical problem in the field of signal or image processing. In this paper local statistical function is used to find the percentage of noise affected in the noise image. Dynamic denoising algorithm is used simultaneously as a tool for enhancing and tracking image pixel. The pixels are chosen based on the prediction...
During view synthesis based on depth maps, also known as Depth-Image-Based Rendering (DIBR), annoying artifacts are often generated around foreground objects, yielding the visual effects that slim silhouettes of foreground objects are scattered into the background. The artifacts are referred as the boundary noises. We investigate the cause of boundary noises, and find out that they result from the...
Multi-view video coding exploits inter-view redundancies to compress the video streams and their associated depth information. These techniques utilize disparity estimation techniques to obtain disparity vectors (DVs) across different views. However, these methods contribute to the majority of the computational power needed for multi-view video encoding. This paper proposes a solution for fast disparity...
Side information plays a key role in the performance of a Distributed Video Coding (DVC) system. However, the generation of side information often relies on complex motion estimation/interpolation operation. The correlation between the source data and the side information, sometimes referred as virtual channel, is also very difficult to model accurately. In this paper, we propose a bitwise prediction...
Stereo matching techniques usually match segments or blocks of pixels. This paper proposes to match segments defined as fuzzy sets of pixels. The proposed matching method is applicable to various techniques of stereo matching as well as to different measures of differences between pixels. In the paper, embedment of this approach into the state-of-the-art depth estimation software is described. Obtained...
In this paper we present our approach to use a combination of radio frequency identification (RFID) and a wireless camera sensor network to identify and track animals at a zoo. We have developed and installed 25 cameras covering the whole zoo. The cameras are totally autonomous and they are configuring themselves in a wireless ad-hoc network. At strategic locations RFID readers are deployed to identify...
In this paper a vision-based algorithm for on-line estimation of position control errors in a guidance system for path tracking is presented. The algorithm uses techniques of pattern recognition, however with a high degree of morphological simplifications. The algorithm detects the path line stretch which is displayed in the actual frame, and estimates the slope of the line and its midpoint. Moreover,...
Error concealment at the video decoder is to recover erroneous picture region based on correctly decoded region in the same frame or the neighboring frames. However, the existing error concealment methods cannot give satisfactory result in some situations, e.g. when a whole frame is lost. In this paper, we propose a novel joint forward-backward concealment (JFBC) method. The key observation is that,...
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