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In this paper, we study the long-term cooperative tracking in large areas using multiple unmanned aerial vehicles (UAVs). Firstly, a hybrid tracking algorithm, which switches between a correlation filters based tracker and a cascaded detector, is developed for the robust long-term tracking using a single UAV. Then, a centralized cooperation strategy is proposed to achieve cooperative tracking using...
The objective of this project is to set up wireless communication for Unmanned Aerial Vehicles (UAVs) and to estimate the position of the UAV using vision-based techniques with an onboard camera, in a real-time, continuously interacting scenario. Here, vision based navigation is explored with different algorithms (RANSAC feature detection and normalized cross correlation with prior edge detection)...
Source camera identification process plays a major role in digital image forensics, which identifies the source camera used for capturing the given image. The state-of-the-art methods for source camera identification are mainly based on identifying the demosaicing artifacts, sensor noise based artifacts or by using image features from spatial/frequency domain. This paper proposes a novel feature based...
Chemically strengthened glass is widely used as a cover glass in consumer electronic devices, such as smartphones, tablets, and notebook computers. A cover glass protects the Liquid Crystal Display (LCD) in these devices from field abuse, such as scratches and impacts in device drop. Therefore, it is important to investigate the protective glass response under dynamic impact loading. The pendulum...
The decreasing size of solder joints leaves limited tolerance of allowable warpage range for successful assembly. Understanding the electronic packages' behavior during the reflow process becomes one of the most important tasks in developing assembly process and assuring reliability. Three-dimensional (3D) digital image correlation (DIC) plays an important role in quantifying warpage of BGA packages...
This paper presents a data-driven method to estimate a high quality depth map of a hand from a stereoscopic camera input by introducing a novel regression framework. The method first computes disparity using a robust stereo matching technique. Then, it applies Random Forest (RF) to learn the mapping between the estimated, noisy disparity and actual depth given ground truth data. We introduce Eigen...
A light field camera can retrieve the depth information and reconstruct a stereoscopic image. The quality of light field image processing is highly dependent on whether the disparity of two adjacent micro images can be determined accurately. In this paper, we apply an algorithm based on dilating image segments to determine disparity precisely. With the dilation operation, the edge and corner information,...
Minimally conscious state (MCS) is a neurological syndrome in which the patient shows signs of partial consciousness after having emerged from unresponsive wakefulness syndrome (UWS), which itself follows a state of coma. Distinguishing between MCS and UWS is complex and has major impact on the clinical management and prognosis of affected patients. Research on disorders of consciousness (DoC) has...
One of the prominent clinical manifestations of schizophrenia is flat or altered facial activity, and flattening of emotional expressiveness (Flat Affect). In this study we used a structured-light depth camera and dedicated software to automatically measure the facial activity of schizophrenia patients and healthy individuals during a short structured interview. Based on K-means clustering analysis,...
This paper describes a simple fast forgery detection scheme. The proposed technique makes use of the fact that, the copied or tampered parts, will not contain the correct camera fingerprint, of the regions it copied to. The technique is based on locating dissimilar blocks between the forged fingerprint and its corresponding mother camera fingerprint. Dissimilarity is measured through searching for...
As a 3D video extension of Audio Video Coding Standard (AVS), 3D-AVS is being developed to improve the coding efficiency of multi-view video. Since multi-view video is composed of projections of the same scenery from different viewpoints at the same time instant, it contains a large amount of inter-view redundancies. To exploit the inter-view correlation, this paper presents a method to derive the...
As more and more audio-visual content such as talks, lectures and presentations is made available online, it becomes increasingly difficult for prospective viewers of such content to assess which videos they might find interesting or engaging. Automatic classification of content as engaging versus non-engaging might help viewers cope with this situation, and presenters gauge their presentation skills...
This paper describes a simple fast forgery detection scheme. The proposed technique makes use of the fact that, the copied or tampered parts of the image, will not contain the correct camera fingerprint, of the regions it copied to. The technique is based on locating dissimilar blocks between the forged image fingerprint and its corresponding mother camera fingerprint. Dissimilarity is measured through...
Due to the development of hand-held Plenoptic cameras, the light filed camera has become more and more popular in recent years. The light field camera can capture the angular and depth information and is able to construct a stereoscopic image. To obtain a high quality reconstructed image, the disparity should be estimated accurately. However, for the sub-images taking from the light field camera,...
The motion of a driving car is highly constrained and we claim that powerful predictors can be built that 'learn' the typical egomotion statistics, and support the typical tasks of feature matching, tracking, and egomotion estimation. We analyze the statistics of the 'ground truth' data given in the KITTI odometry benchmark sequences and confirm that a coordinated turn motion model, overlaid by moderate...
Due to the popularity of multimedia technology and digital world, thousands of videos are accessed through internet in seconds. Most of the videos, available in internet for public access are non-edited videos. Efficient way of searching and storage need an efficient method of annotation. Automatic cut detection is the first stage of any automatic annotation process. In this paper we addressed the...
Phase-shift-based Time-of-Flight (ToF) imaging systems estimate the distances from the camera to the scene points from the phase shift undergone by a modulated light signal, projected onto the scene, instead of actually performing time measurements. The phase shift is typically computed from several values of the cross-correlation between the light signal received by each pixel and a reference signal...
Single-sensor color cameras, which classically use a color filter array (CFA) to sample RGB channels, have recently been extended to the multispectral domain. To sample more than three wavelength bands, such systems use a multispectral filter array (MSFA) that provides a raw image in which a single channel level is available at each pixel. A demosaicing procedure is then needed to estimate a multispectral...
In recent years, free viewpoint video (FVV) technology is increasing popularity for rendering intermediate views from existing adjacent views to avoid the large volume of video data transmission. For generating an intermediate view on a remote display, Depth Image Based Rendering (DIBR) techniques are normally used, however, sometimes it has some missing pixels due to inaccurate depth, low precision...
This paper presents PhotoCluster, a new technique for identifying non-identical near-duplicate images in personal photo collections. Contrary to existing methods, PhotoCluster estimates the probability that a pair of images may be considered near-duplicate. Its main thrust is a multiple clustering step that produces a non-binary near-duplicate probability for each image pair, which exhibits correlation...
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